Method and device for affecting beds, containing liquid substances

FIELD: oil industry.

SUBSTANCE: device has pump, placed on well mouth equipment, tubing string, passing downwards in casing string of well. Node of hollow cylinders is connected to lower portion of tubing string. A couple of pistons is placed inside cylinders node and connected to pump via pump bars and gland rod. For compression of liquid within cylinders node, pump is enabled. Compressed liquid is outputted into casing column, and strike wave is formed as a result. Cylinders node includes upper cylinder, lower cylinder. Transfer cylinder is placed below upper and above lower cylinders. Cylinder with compression chamber is placed between transfer cylinder and upper cylinder. Lower cylinder is made with possible placement of lower piston, and upper cylinder is made with possible placement of upper piston. Lower piston has larger diameter, than upper piston. Displacement of piston affects volume of compression chamber, decreasing it. Liquid in the chamber is compressed. During downward movement of piston liquid is lowered into well. Seismic data from wells at remote locations are gathered and processed.

EFFECT: higher efficiency.

4 cl, 9 dwg

 

The present invention relates to a method and apparatus for creating shock waves, and more particularly to a method and apparatus for repeatedly creating shock waves in the trunk injection wells with the aim of increasing the impact of oil and oil production and implementation of continuous seismic exploration for oil formation.

Seismic surveys performed at different stages of development of oil fields, carried out for the detection of hydrocarbon deposits. Seismic surveys of these species are usually referred to as four-dimensional seismic exploration, which uses data related to the depth, width, length, and time. There are problems caused by the lack of compatibility of the results of research performed at different times. Data analysis is costly and is often unreliable.

When seismic surveying release energy, which is distributed through the soil in the form of vibrations called seismic waves. Seismic waves propagate in all directions and gradually attenuate with increasing distance from the source.

There are seismic waves are of two types. Bulk waves are the fastest seismic waves propagate in the soil. Body waves can be compression waves or shear waves. When the waves PR is go through the ground, they are forcing particles of rock to move in a different way. The compression wave is subjected to breed the action of compression and tension. Shear waves create moving rocks in the direction perpendicular to the direction of propagation. The compression wave can propagate in solid media, liquids or gases, but shear waves can propagate only in solid media. Compressive waves are the fastest seismic waves and are often called primary waves. Shear waves propagate slower and are called secondary waves. Seismographic devices supplied by sensors called seismometers that can detect movement of the ground caused by seismic waves. By seismograph are wavy lines that reflect the magnitude of seismic waves that have passed under it. Record wave, called a seismogram, printed on paper, film or recording tape, or stored and displayed with the help of computers.

With respect to four-dimensional seismic mapping there is a need for a controlled source seismic energy, providing a compatible data for use in four-dimensional seismic mapping. In addition, the long felt need of the source of seismic energy, manage the m thus, so you can “tune” to a specific layer for optimum characteristics for the enhanced recovery of hydrocarbons.

Intensification of seismic or elastic waves is a well-known method for enhancing the recovery of oil from oil-bearing reservoir, described in: "Elastic-wave stimulation of oil production: A review of methods and results", Geophysics, vol. 59, No. 6 (June 1994).

The prior art known and patented a variety of devices to send a shock wave into the borehole. For example, in the patent of Russian Federation №1710709 disclosed method and apparatus, the base plate which is placed in the bottom hole, and a heavy load in the form of water-filled pipe is repeatedly raised and dropped on the support plate, resulting in oil-bearing formation creates vibration. However, repetitive shocks cargo ultimately destroy the borehole bottom. The degree of damage can be minimized by limiting the shock load applied to the base plate, but this decreases the capacity of elastic waves, which leads to reduced efficiency. In addition, the effectiveness of this method is limited by the low rate of conversion of potential energy of the load into the energy of elastic waves.

In the patent USSR No. 1674597 issued Kostrova May 1, 1991, disclosed downhole acoustic generator, comprising a housing with the exhaust hole and an outlet hole, conical nozzle, the resonant aperture and a conical deflector. The angle narrowing conical baffle has a specific value at which the optimum reflection waves generated by the generator and the resonant aperture, so that all wave energy is transmitted in the direction of the wall of the casing string.

In U.S. patent No. 5586602 (Vagin O.) disclosed a method and apparatus for improving the efficiency effects of shock waves on the oil-bearing strata, which includes a rocking chair, placed on the equipment wellhead, tubing column that goes down in operating the well casing string, a hydraulic seal located on the top of the tubing of the column, a cylinder connected with the lower part of the tubing of the column, and the piston, which makes a reciprocating motion up and down inside the tubing string and cylinder. When the piston moves upward, the fluid in the tubing string is compressed. At the top turn up rocking piston out of the upper part of the cylinder so that the fluid in tubing string, is available in the operational casing, resulting in a shock wave. Although this method provides better performance than the method described in p. the tent of the Russian Federation No. 1710709, discussed above, it is limited in terms of reliability, efficiency and performance, as for sealing the wellbore must be installed cement/solid tube, the pressure at the shock front should be limited due to the low reliability of the hydraulic seal, periodically subjected to high pressure, should be used for more ground-based equipment to compensate for the leakage of fluid through the hydraulic seal, casing, cement tube and other hardware, and it does not apply to create a shock wave near the bottom of the wells when the wells have a depth of more than 800-1000 feet.

In U.S. patent No. 5836389 (Wagner et al.) disclosed diffuser-deflector conical shape, which is located so that when the wave hits the diffuser-deflector, there is a partial reflection of the wave in the opposite direction, and at least part of the pulse wave remains in the bottom hole, getting on the tube-bridge. Wave deviates tube bridge, and then in a small area wells weak elastic wave is supported by the retainer and the diffuser-deflector.

In U.S. patent No. 5950726 (Roberts) disclosed a device for influencing the well, which contains an underground casing forming an air-tight container, in which is fixed to the pump-compare the weed column. Tubing column in the casing filled with the working fluid, and rocking results in reciprocating motion of the piston inside the tubing of the column to periodically compress and pad the working fluid to create the energy of an elastic wave. To enhance and direction of waves at the lower end of the cylinder of the pump is fixed to the hollow conical mouthpiece. The working fluid that is essentially fills the pipe node and a sealed reservoir, formed by the mouth of the well casing and tube bridge, installed above the perforations in used or eliminated in the well.

In patent No. 5586602 (Vagin), patent No. 5836389 (Wagner et al.) patent No. 5950726 (Roberts) disclosed are methods for which you want the hole was completely filled with liquid and sealed for the formation of a closed system.

The technical result of the present invention is to eliminate the disadvantages of the devices known from the prior art.

This technical result is achieved in that a method of creating a shock wave in the fluid in the well containing the compression portion of the fluid, the sudden release of the compressed fluid remaining in the fluid, thereby creating a compressive shock wave, and the repetition of compression and release of the fluid, characterized in that according to izaberete is, s contains the following stages:

the location of the device supported by the tubing string and having a chamber and an internal channel in fluid so that the device was immersed in the liquid, while the inner channel and the camera have square cross-sections, the cross-sectional area of the inner channel is less than the cross-sectional area of the camera;

fluid flow into the chamber and into the channel;

the movement of the piston in the piston node on the channel to compress the fluid in the chamber;

the movement of the piston from the channel into the chamber to release the compressed fluid through the channel into the fluid that surrounds the drive piston Assembly includes a piston and a rod passing through the second channel between the camera and the tubing-casing seal relative to the second channel to provide a seal between the compressed fluid in the chamber and the fluid in the tubing string to isolate the tubing of the column above the camera from the camera.

The inner channel can be immersed in the fluid in the wellbore flowing into the reservoir.

You can collect data related to the propagation of seismic waves through the seam, and handling characteristics of seismic waves so that their frequency was essentially equal to the fundamental frequency of the layer.

The rod may be a pump rod passing through the pump is but the compressor casing in the well.

Tubing column may have a length defined from the expression:

Lt=Nb-0,5c/f-Lca,

where Nb- the depth of the borehole bottom;

C is the speed of sound in the fluid in the borehole;

f is the fundamental frequency of the reservoir;

Lca- the length of the specified device having a camera and an internal channel.

Phase adjust the characteristics of seismic waves is carried out so that their frequency was essentially equal to the fundamental frequency of the layer, you can adjust the distance between the lower end of the channel and the bottom of the borehole up to a distance sufficient so that the frequency of the reflected waves when passing back and forth between the lower end of the channel and the bottom hole was essentially equal to the fundamental frequency of the layer.

Phase adjust the characteristics of seismic waves to the natural frequencies of the reservoir can contain the following stages:

the initial location of the amplifier at the lower end of the channel at a distance from the bottom of a well, located in the specified range;

collection and assessment of the seismic data after the release of the compressed fluid at the lower channel into the well.

adjusting the distance between the amplifier at the lower end of the channel and the bottom of the borehole up to a distance sufficient so that the frequency of the reflected waves when passing back and forth between the amplifier and the bottom hole was essentially equal to the fundamental frequency of the layer.

At the stage of adjustment of the distance between the amplifier at the end of the lower channel of the borehole and the borehole bottom to a distance sufficient so that the frequency of the reflected waves when passing back and forth between the lower end of the channel and the bottom hole was essentially equal to the fundamental frequency of the formation, you can adjust the length of the sucker rods and tubing of the column to adjust the position of the amplifier in relation to the bottom of the borehole in which it is installed.

At the stage of collecting data related to propagation of seismic waves through the layer, you can set the geophones in wells located at a distance from wells, in which there is a device having a chamber and an internal channel, and record seismic data received by the geophones.

Data related to the propagation of seismic waves through the layer, can be collected in a location at a distance within approximately 1 mile to approximately 2 miles from wells, which include a device having a chamber and an internal channel.

You can make the location of the equipment for seismic data acquisition in place at a distance from the specified wells, periodic collection of data for use when executing a three-dimensional simulation of the velocity distribution and to the rates reflect and compare the simulated distribution, get in the first time to simulate the distributions obtained at a later point in time, to create a four-dimensional seismic map layer.

You can use a high pressure chamber having a cross sectional area that is greater than the cross-sectional area of the piston.

Well may be an injection well, and the device having a chamber and an internal channel can be set in the lower part of the injection wells, and the method may include the following additional steps:

setting of the packer in the tubing string to isolate the annulus of the well above the packer from the annulus below the packer;

installing a perforated cylinder below the packer;

installing the device with the camera and the inner channel, under the lower part of the perforated cylinder;

the flow of the liquid in the tubing string and a perforated cylinder in the annular space of the borehole below the packer; and

movement of the piston from the chamber at the lower channel for discharging the water contained in the chamber, and to release fluid from the annulus injection wells into the chamber to create a second shock wave in the borehole.

Piston Assembly during upward can compress the fluid contained within the Kama is s, and to release fluid from the interior of the chamber in the barrel injection wells.

The amplitude A

u
sw
the shock wave at the upper point of the turn-up can be determined from the following formula:

where

π=3,14;

T=60/n;

n is the number of strokes per minute;

b is the coefficient of compressibility of the pumped water;

Vcchamber size;

P is the pressure inside the chamber;

Dpthe diameter of the piston;

Dis- inner diameter of the sealing device;

Lp- the length of the piston;

Lis- the length of the sealing device;

Vr- the speed of movement of the sucker rods string;

μ is the viscosity of the injection water;

k - coefficient of the liquid displacement piston;

δ - the gap inside the sealing device and between the piston and the lower cylinder.

Piston Assembly in the course of down can pad the fluid contained in the chamber, and to release fluid from the annulus into the chamber when the piston is pulled out from the bottom of the channel.

The amplitude A

d
sw
the second shock wave at the lowest point of the turn down can be determined from shadowsforsale:

where ρwis water density;

βa-the content of air/gas in the pressurized water;

Vc- volume of the vacuum chamber;

Dpthe diameter of the piston;

Dis- inner diameter of the sealing device;

k is the adiabatic coefficient;

Lstr- stroke;

g - free fall acceleration;

Hlcthe depth of the bottom of the cylinder.

Well may be an inclined borehole, and the device having the chamber and the inner channel is set to non-vertical portion of the inclined hole.

In another aspect of the present invention a method for creating seismic waves in the oil-bearing formation containing a compression of the fluid in the borehole, the sudden release of the compressed fluid in the remaining liquid in the well, thereby creating a compressive shock wave, and the repetition of compression and release of fluid according to the invention comprises the following stages:

the location of the well site, the cylinder having a pressure chamber and upper and lower inner channels communicated with the camera so that the node of the cylinder is supported by the booster casing and immersed in the liquid in the borehole;

the location of the piston so that the rod on the piston node passes through the upper channel and provide the t seal the top of the channel to provide a seal between the chamber and the fluid in the tubing string to isolate the tubing of the column above the camera from the camera, as the piston performs a reciprocating motion in the lower channel and is drawn into the chamber;

the implementation of the reciprocating motion of the rod and piston so that when you move the rod and piston, the liquid in the chamber is compressed, and when the piston is moved from the lower channel in the camera compressible fluid is released through the lower channel in the well.

You can use a high pressure chamber having a cross sectional area that is greater than the cross-sectional area of the piston.

The site of the cylinders can be positioned near the bottom of the well.

Well may be partially filled with fluid.

You can move the piston from the pressure chamber into the lower channel for discharging the water contained inside the pressure chamber, and for releasing water from the well into the chamber when the piston is moved from the lower channel in the well.

The amplitude of the shock wave created when the piston is moved from the lower channel in the camera, can be determined from the following formula:

where π=3,14;

T=60/n;

n is the number of strokes per minute;

b is the coefficient of compressibility of the pumped water;

Vc- volume of the vacuum chamber;

P is the pressure inside the vacuum chamber;

Dpthe diameter of the piston;

Dis- inner diameter of the sealing device;

Lp- the length of the piston;

<> Lis- the length of the sealing device;

Vr- the speed of movement of the sucker rods string;

μ is the viscosity of the injection water;

k - coefficient of the liquid displacement piston;

δ - the gap inside the sealing device and between the piston and the lower cylinder.

The amplitude of the shock wave created when the piston is moved from the lower channel in the borehole can be determined from the following formula:

where ρwis water density;

βa- the content of air/gas in the pressurized water;

Vc- volume of the vacuum chamber;

Dpthe diameter of the piston;

Dis- inner diameter of the sealing device;

k is the adiabatic coefficient;

Lstr- stroke;

g - free fall acceleration;

Hlcthe depth of the bottom of the cylinder.

You can collect data related to the propagation of seismic waves through the formation and adjustment of the characteristics of seismic waves so that their frequency was essentially equal to the fundamental frequency of the layer.

Phase adjust the characteristics of seismic waves so that their frequency was essentially equal to the fundamental frequency of the layer, you can adjust the distance between the lower end of the channel and the bottom of the borehole up to a distance sufficient so that the frequency of the reflected waves when passing back and forth between the lower end of the channel and the bottom hole was, essentially equal to the fundamental frequency of the layer.

Phase adjust the characteristics of seismic waves so that their frequency was essentially equal to the fundamental frequency of the reservoir may contain the following stages:

the initial location of the amplifier at the lower end of the channel, at a distance from the borehole bottom, not less than 200 feet;

collection and assessment of the seismic data after releasing the compressed fluid in the lower channel into the well.

adjusting the distance between the amplifier at the lower end of the channel and the bottom of the borehole up to a distance sufficient so that the frequency of the reflected waves when passing back and forth between the lower end of the channel and the bottom hole was essentially equal to the fundamental frequency of the layer.

The amplifier can be mounted at a distance from the bottom of a well defined from the following formula:

S=c/2f

where C is the speed of sound in the liquid contained in the well; and

f is the fundamental frequency of the layer.

In another aspect of the invention a device for creating a shock wave in the fluid in the wellbore containing alluvial-compressor column, passing in the wellbore, the site of the cylinders connected to the tubing string and containing an elongated internal chamber having an upper channel and a lower channel, the upper channel has a cross sectional area which m is niche cross-sectional area of the lower channel, means for positioning the node of the cylinder so that it was submerged in the liquid in the well bore, and the inner chamber was filled with liquid, a piston Assembly including a seal in contact with the upper channel to provide a seal between the compressed fluid in the chamber and the fluid in the tubing string in the well above the chamber from the liquid in the chamber, and the lower piston mounted in the lower channel can be moved into the internal chamber to compress parts of the liquid contained in the inner chamber, and releasing the fluid in the well bore when the piston is moved along the lower channel into the internal chamber, pumping means connected to the piston unit for moving the piston within the cylinders node.

Piston Assembly may include upper and lower pistons mounted for movement in the internal chamber to compress parts of the liquid in the inner chamber when the course up, and the check valve on the lower piston, is arranged to open when the course down for releasing the fluid in the inner chamber, and the site of the cylinders connected to the tubing string contains upper cylinder having a specified upper channel adapted to accommodate the upper piston lower cylinder below the top of the cylinder, having indicated the p bottom channel and configured to accommodate the bottom of the piston, the lower channel has a cross sectional area that is larger than the cross-sectional area of the upper channel, the lower cylinder also has the lower end of the containing hole, cylinder compression, forming a specified internal chamber and located between the upper and lower cylinders, and a transfer cylinder located between the lower cylinder and cylinder compression.

Pumping means connected to the piston node may be configured to move the piston from a node of the cylinder at the lower channel for discharging the liquid contained inside the node of the cylinder, and allow release of fluid contained in the well bore, cylinders node.

Tubing column, passing in the borehole has a length that can be determined from the following formula:

Lt=Nb-0,5c/f-Lca,

where Nbthe depth to the bottom of the borehole;

C is the speed of sound in the fluid in the wellbore;

f is the fundamental frequency of the reservoir;

Lca- the length of the cylinders node.

Well may be an injection well, additionally containing a packer placed in the tubing string, the perforated cylinder, located in the tubing string below the packer sealing means connected between the perforated cylinder is NDRA and the junction of the cylinder for the flow of the liquid in the tubing string and through the perforated cylinder in the well bore below the packer, and the amplifier connected to the node of the cylinder and positioned to block the passage of the shock waves pass amplifier.

The device may further comprise a control cylinder connected between the node of the cylinder and booster, to prevent erosion of the cylinders node & amp liquid flowing and flowing from the inner chamber.

Piston Assembly may include a pump rod connected to the seal, and a stabilizing rod that is connected with the pump rod, and the piston connected to the stabilizing rod is placed can be moved in the inner chamber and in the lower channel.

The lower cylinder may be located below the blowout of the cylinder and has an inner channel configured to accommodate the piston.

Blowout of the cylinder may have an internal diameter determined from the following formula:

where IDpc- inner diameter blowout of the cylinder;

Dpthe diameter of the cylinder;

IDc- internal size of the vacuum chamber;

ρwis water density;

g - free fall acceleration;

N - depth blowout of the cylinder;

Pdis the saturated vapor pressure;

ξ is the coefficient of hydraulic resistance;

P - pressure vnutrivakuumnyh camera.

Amplifier with an inner diameter varying in accordance with the expression Ida(x)=Dpexp(xα/2)may have a length defined from the following formula:

I=α/(2m22),

where m=(α2-k2)1/2,

k=ω/c

ω - repetition frequency shock waves;

C is the speed of sound in water;

x - the current length of the amplifier;

α - constant.

Sucker rod may have a diameter of drnot less than:

where ρwis water density;

ρs- the density of steel;

β - the content of air/gas in the pressurized water;

Vc- volume of the vacuum chamber;

Dpthe diameter of the piston;

Dis- inner diameter of the sealing device;

k is the adiabatic coefficient;

Lstrthe stroke length.

Roll bar may have a length defined from the following formula:

where Lsr- the length of the stabilizing rod;

π=3,14;

I - the main Central radius of gyration of the cross section of the middle rod;

dsrthe average diameter of the rod;

E - the modulus of elasticity of the material of the rod;

P is the pressure inside the vacuum chamber;

Dpthe diameter of the piston;

Dis- inner diameter of the sealing device;

n - factor is prochnosti.

The piston may have a narrowing at both ends with angle α not less than 10°and the ratio of the length Ltnarrowing to a diameter of Dpthe piston is not greater than 0.5.

The length of the bottom of the cylinder can be determined from the following formula:

where Llc- length of the lower cylinder;

Lstr- stroke;

Lr- the length of the sucker rod Assembly;

Dpthe diameter of the piston;

Dis- inner diameter of the sealing device;

E - the modulus of elasticity of the material of the rod;

Puthe pressure inside the vacuum chamber during upward;

g - free fall acceleration;

ρwis water density;

ρs- the density of steel;

Lp- the length of the piston.

Another aspect of the invention is a device for creating a shock wave in the wellbore containing tubing column, passing down into the wellbore, the site of the cylinders connected to the tubing string and containing an elongated internal chamber, means for filling liquid of the wellbore and the inner chamber, a piston Assembly, including upper and lower pistons mounted for movement within the chamber to compress parts of the liquid contained in the inner chamber, and releasing the fluid in the wellbore, and pumping means connected with the piston is evil, to move the piston within the cylinders node, wherein the node of the cylinder contains an upper cylinder having an inner channel configured to accommodate the top of the piston, the lower cylinder below the top of the cylinder and having an inner channel configured to accommodate the bottom of the piston and having a cross sectional area that is greater than the cross-sectional area of the inner channel of the upper cylinder and lower cylinder also has the lower end of the containing hole, cylinder compression, forming a compression chamber located between the upper and lower cylinders, and a transfer cylinder located between the lower cylinder and cylinder compression.

The lower piston may have a cross sectional area greater than the cross-sectional area of the upper piston.

The lower piston may include an upper portion having a mostly smooth outer perimeter, and the lower part, with many flow channels.

The lower piston may be able to move between a first position in which the upper part of the lower piston is at least partially located within the lower cylinder, and a second position in which the lower part of the bottom of the piston at least partially located inside the intermediate cylinder.

Pumping means mo is et to include a rocking chair, connected with the piston sub-Assembly for reciprocating movement of the piston between the first and second positions.

The upper piston can be rigidly connected with the lower piston via a connecting rod.

The lower piston may include pervious to the flow means to allow flow of fluid upward through the lower piston in the compression chamber when moving the lower piston down in the cylinders node.

Pervious to the flow of the tool may include an internal channel through the lower piston, and a ball placed so that they can move in the piston near the inner channel, resulting in moving up the bottom of the piston in the site cylinder ball closes the inner channel to prevent the passage of fluid through the lower piston, and when moving down the bottom of the piston in the site cylinder ball releases the channel, resulting in the possibility of leakage of liquid through the lower piston in the compression chamber.

For a better and more complete understanding of the invention the accompanying drawings two preferred embodiments of the invention, depicting the following:

figure 1 represents a side view in section of the device according to the invention, installed in a borehole;

figure 2 is a detailed view of the bottom of the piston in the compression chamber;

Phi is .3 - the cross-section of the lower part of the lower piston;

4 is a side view in section of a second variant implementation of the device according to the invention, installed in the injection well;

5 is a cut node of the cylinders of the second variant of implementation of the device;

6 - cut the lower part of the lower piston, cylinder and amplifier of the second variant of implementation of the device;

Fig.7 is a view of the piston of the second variant of implementation of the device;

Fig - schematic view of the arrangement of the equipment for four-dimensional seismic exploration;

Fig.9 is a graph of amplitude against frequency.

A detailed description of the preferred variant embodiment of the invention.

Figure 1 shows a device 2 to generate a shock wave in the barrel 4 bore. The device comprises a rocker 6, located on the equipment wellhead, tubing column 8, passing down into the perforated operational casing 10 wells, and the node 12 of the cylinder connected with the lower end 8A of tubing of the column. In addition, the wellhead equipment is placed opposite the valve casing 14, the check valve 16 tubing columns and hydraulic seal 18.

The node 12 of the cylinder includes an upper cylinder 20 connected to the lower end 8A of tubing columns, cylinder compression, connected with the lower end of the upper cylinder 20, the transition cylinder 24 connected to the lower part of the cylinder 22 of the compression, and the lower cylinder 26 connected to the lower part of the intermediate cylinder 24. The upper cylinder has an internal channel 21, the cylinder compression has a camera 23 compression, and the bottom cylinder has an internal channel 27 and the opening 28 at the lower end.

Piston Assembly 30 includes an upper piston 32, is made with possibility of accommodation in the inner channel 21 of the upper cylinder 20, and the lower piston 34, made with the possibility of accommodation in the inner channel 27 of the lower cylinder 26. For the reasons described below, the diameter of the upper piston 32 is less than the diameter of the lower piston 34. The upper piston 32 is connected to the rocking chair 6 through the stuffing box rod 35, which passes through the hydraulic seal 18, and a rod 36, which pass through the tubing string 8. The upper piston 32 is connected with the lower piston 34 through one or more connecting rods 38.

As shown in figure 2, 3, the lower piston 34 includes an upper portion 34a having a smooth outer surface 40, which forms a generally waterproof seal against the inner channel 27 of the lower cylinder 26, and the lower portion 34b, which has flow channels 42. Flowing through channel 44 is held in the longitudinal direction through the Shen from the chamber 46 to the ball, located in the upper part of the piston to the lower end 34C of the piston. The ring 48 of the seat is located between the camera 46 for the ball and the flow-through channel 44.

The camera 46 for the Orb has through holes 50 and includes a ball 52, is arranged to mate with the ring 48 of the saddle. When, during the compression stroke of the lower piston 34 moves up, the ball 52 is in contact with the ring 48 of the seat, thereby preventing the flow of fluid through the flow-through channel 44. When the lower piston 34 moves downward, the ball 52 and the ring 48 of the saddle dismantled, this permits the flow of liquid up into the chamber 23 of the compression flow through the channel 44.

The device operates as follows.

To create a shock wave in the wellbore using the device, the barrel 4 bore and the node 12 of the cylinder is filled with a suitable liquid 54, for example water. Hydrostatic liquid level in the well must be above the upper part of the upper cylinder 20. During the course of the upward rocking 6 volume in the cylinders node located between the bottom of the upper piston 32 and the lower piston 34 is reduced. Therefore, the water contained therein is compressed. Volume decreases due to the fact that the lower piston 34 large diameter displaces more water than the upper piston 32 of small diameter, when they are moved one after the other the node 12 cylinders. The volume of the compression chamber is defined by the following expression:

where q1=πd1

3
1
/μl1,

q2=πd2

3
2
/μl2,

q1and q2- the losses due to sliding between the surfaces of the piston and cylinder respectively for the upper and lower piston;

d1and d2- diameter respectively of the upper and lower piston;

Ls- stroke;

δ1and δ2- the gap between the inner surface of the cylinder and the outer surface of the piston, respectively for the upper and lower piston;

l1and l2- the length of the respectively upper and lower piston;

μ the viscosity of the compressed fluid;

P is the pressure at the shock front;

b is the coefficient of compressibility of the liquid.

When the upper portion 34a of the lower piston 34 extends from the bottom of the cylinder 26, the compressed fluid is released into the lower cylinder 26 and in the operational casing 10, this creates a shock wave that affects the bottom hole. Part of the energy of the shock wave is reflected back along the direction of the Department to the wellhead, while the part is held in a surrounding layer or layer 56 for intensification of oil production.

High efficiency of the present invention due to the high capacity of the shock wave. Wave high power can be created because the maximum pressure is not limited to the working pressure of the hydraulic seal, “swimming” gland piston rod or other possible leaks in the casing. The present invention allows to obtain any acceptable maximum pressure on the front of a shock wave generated in accordance with the following equation:

N=πd

2
2
R2/8ρ, where

N - power of the shock wave;

d2- the diameter of the lower piston 34;

P is the maximum pressure of the compressed fluid between the upper 32 and lower 34 pistons;

ρ - the density of the liquid; and

C is the speed of sound in the liquid.

Therefore, if the pressure P is doubled, wave power increases four times, and the volume of the reservoir exposed to waves, increases significantly.

Because the present invention does not require that the volume of the borehole was sealed, the need to cement the tube is eliminated. In addition, the present invention can be used on lesofat near the bottom of the borehole, this reduces the loss of energy of the shock wave propagating in the casing. Note, however, that in the case when it is deemed advisable to create a hydraulic isolate sections of the wellbore, the casing string above the bottom hole, you can install the plug-bridge. It should be clear that, if the tube-axle installed in the wellbore between the bottom of the well and a device for creating a shock wave, the location in which you installed the plug-bridge, is considered the borehole bottom.

Although in accordance with the provisions of the patent law are considered and described preferred forms and embodiments of the invention, the average expert in the art should understand that various changes and modifications can be made without deviation from the ideas of the invention set forth above.

Detailed description of the second variant embodiment of the invention.

Figure 4, figure 5 shows the device 102 to generate shock waves in the injection hole 121. On the wellhead equipment installed rocking the pump, of the type shown in figure 1, or other pump unit, for example a hydraulic power cylinder. In conjunction with the device shown in figure 4, 5, also used additional ground equipment shown in figure 1, for example, the p valve casing, check valve tubing columns included in the discharge line, and a hydraulic seal.

Tubing column 103 is held down in the operational casing 113, and into the tubing string 103 is set packer 115. The perforated cylinder 114 is mounted on the lower end of the tubing of the column 103 below the packer 115, which, in turn, is below the level F of the fluid in the injection well. The sealing device 105 is installed on the end of the perforated cylinder 114 and is connected to node 122 of the cylinder.

As better shown in figure 4, the tube-bridge 132 can be installed in the wellbore above the bottom hole 131 for the implementation of the hydraulic isolation of the section of the wellbore above the tube bridge from the side of the wellbore below the tube bridge. If the wellbore installed plug-bridge, the well depth is the depth at which the installed plug-bridge.

Node 122 of the cylinder includes a vacuum tube 107 that is connected with the lower end of the sealing device 105, blowout of the cylinder 109 which is connected with the lower part of the vacuum tube 107, the lower cylinder 110, which is connected with the lower part of the blowout of the cylinder 109, and the amplifier 112 connected to the lower part of the lower cylinder 110. The sealing device 105 includes a sealing Stan is at 106, node 122 of the cylinder contains a vacuum chamber 126, the lower cylinder 110 has an internal channel 127, the amplifier 112 has a diffuser 128.

Piston Assembly 129 includes a piston 111, is made with possibility of installation in the inner channel 127 of the lower cylinder 110, at least one stabilizing rod 118 and at least one pump rod 108. The lower piston 111 is connected to the rocking chair by sealing rod 120, which passes through the hydraulic seal 117, a few rods 104 that pass through the tubing column 103, at least one pump rod 108 and at least one stabilizing rod 118 located at the node 122 of the cylinder. Preferably, the sealing device 105 include one or more devices of various types which contain o-rings or precision couple formed by the rod and the cylinder.

As shown in Fig.6, the lower piston 111 which is connected with a stabilizing rod 118 may extend from the bottom of the cylinder 110 and the amplifier 112 in the casing.

The operation of the device is as follows.

To use the device to create a shock wave in the discharge hole 121, the node 122 cylinders are mounted inside a casing 113 of the injection wells at the end of the sealing device 105, Saedinenie the lower part of the perforated cylinder 114, which, in turn, is connected to the booster casing 103 which is connected to the discharge line through the valve. Packer 115 is used to separate the upper part of the borehole from the bottom to prevent discharge of water in thin layers of the reservoir 130.

During the course of the downward rocking piston Assembly 129, moving down, creates a vacuum inside the vacuum chamber 126 due to the fact that when moving the piston 111 increases the amount of node 122 of the cylinder, while the sealing device 105 provides sealing of the node 122 of the cylinder at the upper end. When the upper part of the piston 111 out of the lower cylinder 110, the water in the casing 121, is blown into the lower cylinder 110 and the vacuum chamber 126 due to the differential pressure inside the vacuum chamber 126 and the hydrostatic pressure in the casing 121, this creates a shock wave that spreads down and hits the bottom hole and the hole 119. Part of the energy of the shock wave is reflected back towards the amplifier (and again reflected to the bottom of the borehole), while part is transmitted into the surrounding layer or layer 130, thereby intensificar the impact of oil and oil production. Water from the casing expands the volume of the node 122 of the cylinder until such time as the piston 111 will not be re-introduced into the lower cylinder 110 in the beginning of the e turn up.

During the course of the upward rocking 101 volume node of the cylinder decreases. Therefore, the water contained therein is compressed. When the lower part of the piston 111 out of the upper part of the lower cylinder 110, the condensed water in the node 122 of the cylinder, is produced in the lower cylinder 110 and forth in the casing 121, this creates a shock wave that falls on the perforation 119 and bottom of injection wells. Part of the energy of the shock wave is reflected back towards the amplifier (and again reflected to the bottom of the borehole), while part is transmitted into the surrounding layer or layer 130 with the aim of increasing the permeability of the reservoir and thereby intensify the selection and production of oil.

There is a better possibility of applying the present invention in the case of each combination of the following options, which include well depth, diameter and length of the piston and the lower cylinder, the diameter and length of the vacuum chamber, the diameter and length of the sucker rods string, the size of the sealing device, the stroke length, the number of strokes per minute and properties of injection water or other liquid. In particular, in the case of a combination of stroke length rocking 3 m, 6 strokes per minute, the depth of the borehole bottom, equal to 1070 m, the volume of the vacuum chamber, equal to 0.2 m3as the diameter of the piston is equal 0,06985 m, internal diameter of the sealing device, equal 0,05715 m, the pressure within the vacuum chamber, equal 21,0 MPa, coefficient of compressibility of water equal to 2·103MPa, the speed of sound in water is equal to 1000 m/s, determine the content of air/gas in the water of 0.001, the fundamental frequency of the layer, equal to 25 Hz, the adiabatic coefficient for air is 1.4. In this case, the best settings to use are of the following formulas.

The optimal length of tubing of the column is determined from the following expression:

Lt=Nb-0,5c/f-Lca,

where Nb- the depth of the borehole bottom;

C is the speed of sound in water contained in the wellbore;

f is the fundamental frequency of the reservoir;

Lca- the length of the cylinders node.

In the case of Lca=50 m, with a=1000 m/s, f=25 Hz and Hb=1070 m length of tubing of the column should be 1000 m to create vibrations caused shock waves reflected from the borehole bottom and from the amplifier at the frequency corresponding to the fundamental frequency f of the reservoir. In this case, there will be a resonance phenomenon, and the range of seismic waves will be much more.

High efficiency of the present invention due to the high power shock wave and placing the device in an existing well without cement/hollow tube. Wave high power can be created due to high pressure inside the vacuum chamber, n is the limited working pressure hydraulic seal 117, “swimming” gland stem, possible leakage from the casing, and due to the lack of gas flow into the casing from the reservoir. The amplitude A

d
sw
the shock wave at the lowest point of the turn-down can be controlled by using parameters determined from the following formula:

where ρwis water density;

βa- the content of air/gas in the pressurized water;

Vc- volume of the vacuum chamber 126;

Dpthe diameter of the piston 111;

Disthe inner diameter of the seal device 105;

k is the adiabatic coefficient;

Lstr- stroke;

g - free fall acceleration;

Hicthe depth of the bottom of the cylinder.

In this case, the calculated amplitude of the shock wave is 9.5 MPa for the following values of parameters: ρw=1000 kg/m3, g=9,81 m/s2Nlc=1000 m, βand=0,001, Vc=0.2 m3Dp=0,06985 m, Dis=0,05715 m, Lstr=3.05 m, k=1,4 for air.

In addition, the present invention provides the ability to create maximum pressure on the front of a shock wave when the course up, determined from the following formula:

p> where π=3,14;

T=60/n

n is the number of strokes per minute,

b is the coefficient of compressibility of the pumped water;

Vc- volume of the vacuum chamber 126;

P is the pressure inside the vacuum chamber 126;

Dpthe diameter of the piston 111;

Disthe inner diameter of the seal device 105;

Lp- the length of the piston 111;

Lis- the length of the sealing device 105;

Vr is the speed of movement of the column 104 of pump rods;

μ is the viscosity of the injection water;

k - coefficient of the liquid displacement piston 111;

δ - the gap inside the sealing device 105 and between the piston 111 and the lower cylinder 110.

The calculated amplitude of this shock wave is equal to 20 MPa for the following values of parameters: k=0.55 and b=2·103MPa, n=6 strokes per minute, Vc=0.2 m3Dp=0,05715 m, Dis=0,06985 m, Vr=0,6 m/s, μ=10-3PA·C, P=21 MPa, δ=7,62·10-5m, Lp=Lis=0,91 m

Therefore, the amplitude of the shock wave can be adjusted continuously, for example, by changing the number n of strokes per minute and the velocity Vrmove columns rod or, in other words, by changing the length Lstrprogress when using the water pump.

So in a vacuum chamber 126 in the course of down has created a vacuum, the weight of the column 104 of pump rods and the piston 129 must overcome aimed VVER is a negative force, created inside the vacuum chamber 126. Therefore, the rod should have some minimum radius. In other words, the diameter drsucker rods shall not be less than:

where ρw- the density of water,

ρs- the density of steel;

βa- the content of air/gas in the pressurized water;

Vc- volume of the vacuum chamber 126;

Dpthe diameter of the piston 111;

Disthe inner diameter of the seal device 105;

k is the adiabatic coefficient;

Lstrthe stroke length.

To the parameters mentioned above of the present invention, namely at ρw=1000 kg/m3that ρs=7800 kg/m3that βand=0,001, Vc=0.2 m3Dp=0,06985 m, Dis=0,05715 m, Lstr=3.05 m, k=1,4 (for air), to overcome the effect of the vacuum in the vacuum chamber 126 that is created during the down, the diameter drsucker rods must not be less 0,0148 m

To provide an alternating output piston 111 of the lower and upper part of the lower cylinder 110, respectively, in the lowest point of the stroke down and at the top of the stroke up the length of the bottom of the cylinder should be less than a certain value determined from the following formula:

where Lic- length of the lower cylinder 110;

Lstr- stroke;

L r- the length of the set of rods 106;

Dpthe diameter of the piston;

Disthe inner diameter of the seal device 105;

E - the modulus of elasticity of the material of the rods;

Puthe pressure inside the vacuum chamber 126 when the course up;

Pdthe pressure inside the vacuum chamber 126 during the course down;

g - free fall acceleration;

ρwis water density;

ρs- the density of steel;

Lp- the length of the piston.

Therefore, the length of the bottom of the cylinder should not be more than 0.5 m with the following parameters: Lstr=3.05 m, E=2·105MPa, Lp=0.9 m, dr=0,0254 m, Ru=21 MPa, Pd=0.17 MPa, Dp=0,06985, Dis=0,05715 m, Lr=1070 m ρw=1000 kg/m3, g=9,81 m/s2that ρs=7800 kg/m3.

In addition, the present invention has a high efficiency due to the installation of the amplifier 112 connected to the lower part of the lower cylinder 110. The amplifier 112 reduces the loss of energy of a shock wave up to 40-50% and increases its amplitude. Taking into account that the internal diameter of amplifier 112 (or diffuser 128) is changed in accordance with the expression IDa(x)=Dpexp(xα/2), where x is the current length of the amplifier, and α - constant), the optimal total length L of the amplifier is determined from the formula:

L=α/(2m22),

where m=(α2-k2 1/2;

k=ω/;

ω - repetition frequency of the shock wave;

C is the speed of sound in water or other liquid in the well.

The coefficient k is equal to 0,0343 m-1if the amplifier 112 is set to 20 m above the bottom hole, and C=1000 m/s. Assuming that the inner and outer diameter of the amplifier, respectively 0,06985 m and 0,1156 m α=13.6 m-1the parameter m is equal to 13,59 m-1. Therefore, the optimal length of the amplifier 112 is 0,074 m Ratio And the gain of the amplifier 112 is described by the following formula:

where Sh(ml/2) and Ch(ml/2), respectively, the hyperbolic sine and cosine.

To set the above parameters, the ratio of the gain equal to 1.41.

In addition, the present invention has a high efficiency due to the installation of the amplifier 112 at some distance from the borehole bottom, the result of which provided a consistent reflection of waves at a frequency that coincides with the fundamental frequency of the layer, and this allows to significantly increase the area subjected to the action of waves propagating through the formation. The installation distance of the amplifier 112 is determined from the formula:

S=c/2f

where C is the speed of sound in water, which is in the wellbore;

f is the fundamental frequency of the layer.

For example, the distance S of the unit is 20 m for the following parameters: C=000 m/s, f=25 Hz (see Residual oil reservoir recovery with seismic vibrations", authors: Nikolaevsky et al., published in SPE Production &Facilities, May, 1996).

In addition, the present invention provides high reliability, created through the installation of blowout of the cylinder 109, precluding cavitation erosion of the upper part/lower part of the lower cylinder 110 and the upper part/lower part of the piston 111, occur due to the high velocity of the water during discharge of water from the wellbore into the vacuum chamber 126 and the lower cylinder 110 at the bottom of the stroke down and to the discharge of water from the vacuum chamber 126 in the wellbore at the top of the turn up.

Inner diameter IDpcblowout of the cylinder 109 should be not less than:

where Dpthe diameter of the piston 111;

IDc- inner diameter of the vacuum chamber 126;

ρwis water density;

g - free fall acceleration;

N - depth blowout of the cylinder 109;

Pdis the saturated vapor pressure;

ξ is the coefficient of hydraulic resistance;

P is the pressure inside the vacuum chamber 126.

When the real parameters (the best use for the parameters mentioned above of the present invention) diameter blowout of the cylinder 109 should not be less than 0,079 m for the following values of pairs is m: D p=0,06985 m, IDc=0,0742 m, R=21 MPa, ρw=1000 kg/m3, g=9,81 m/s2, H=1000 m, Pd=0.17 MPa, ξ=9,0.

High reliability is also ensured by the installation of a stabilizing rod 118 on the upper part of the piston 111, thus preventing the possibility of loss of stability (i.e. bend) the rod 118 due to the significant forces acting on the rod 118 immediately after the occurrence of the shock wave. Length Lsra stabilizing rod 118 is determined from the formula:

where π=3,14;

I - the main Central radius of gyration of the cross-section of the stabilizing rod 118;

dsr- the diameter of the stabilizing rod 118;

E - the modulus of elasticity of the material of the rod;

P is the pressure inside the vacuum chamber 126;

Dp- the diameter of the lower piston 111;

Disthe inner diameter of the seal device 105;

n - factor.

For example, in the case of I=0,0254 m, dsr=0,0254 m, n=2, E=2·105MPa, R=21 MPa, Dp=0,06985 m, Dis=0,05715 m it is preferable that the length of the stabilizing rod 118 does not exceed 2,52 m

On Fig shows the well 200 source with the device 2 or 102 installed in it, to create a seismic shock waves. Preferably, the bore 200 source was an injection well used for navodneniyami to supply a variety of exciting the borehole materials, for example, steam, acids, surfactants or tearing the material.

Observation wells 205, 210, each equipped with a group of geophones 215, which may be arranged in series vertically, or may be multi-component geophones.

The geophones are of conventional design and is connected to the appropriate equipment for multichannel recording of seismic signals and data.

Seismic data collected at the observation wells 205, 210 may be analyzed to determine the effectiveness of seismic waves radiated devices 2, 102 into the reservoir. On the basis of the recorded seismic data characteristics of the devices 2, 102 can be adjusted for operation at the fundamental frequency or natural frequency of the layer. For example, to ensure optimal impact with the aim of increasing the permeability of the formation, the frequency of the rocking 101 pump unit and the distance of the amplifier 112 from the well bottom can be changed to adjust the device 102 in order to generate shock waves at the fundamental frequency of the reservoir. To optimize the pressure distribution in the reservoir when the device 102 vertically in the hole should be positioned so that the shock wave created at the fundamental frequency. A shock wave propagating in the radial the directions from the well source, are reflected and refracted when they pass through the reservoir to the geophones 215 in monitoring wells. Waves can be analyzed and adjusted to optimize the efficiency of the device 102 to stimulate fluid flow to production wells on the field.

Shown in figure 9 graph of the dependence of amplitude on frequency shows that the amplitude increases with increasing frequency until, until it reaches a maximum, after which the amplitude decreases with further increase in frequency.

The data collected in monitoring wells 205, 210, can be used to determine the frequencies that are most effective for stimulation. Layer filters out frequency different from the fundamental frequency.

The present invention has a high efficiency due to the installation of the amplifier 112 at a distance S' from the bottom of the well or at a distance S from the bridge plug 132 (tube-axle set, if the bottom hole is from the amplifier 112 at a distance greater than desired), but below the holes 119, resulting in between the bottom of a well or tube-bridge and amplifier 112 generates a sequence of reflected waves at a frequency that coincides with the fundamental frequency of the layer, and this allows to significantly increase the area exposed to waves, C is by using the invention and passing through the reservoir. The distance from the bottom 131 of the well or the bridge plug 132, which must be installed amplifier 112, is determined from the following formula:

S=c/2f

where C is the speed of sound in the liquid contained in the wellbore;

f is the fundamental frequency of the layer.

For example, the distance S installation is 33 feet for the following parameters: C=1000 m/s, f=25 Hz (see Residual oil reservoir recovery with seismic vibration", authors: Nikolaevsky et al., published in SPE Production &Facilities, May 1996; note the frequency spectra at various distances from the explosion). The basic frequency determined by setting the geophone (geophone) 215 on the same level as in the productive layer in one of the observation wells 205, 210, and generate at least one shock wave. The frequency spectrum measured with a geophone 215, as shown in Fig.9, the frequency with the highest amplitude, is the fundamental frequency of the reservoir. After determination of the distance S settings (as in depth) in the above formula, you can determine the main frequency for each sublayer by setting the geophones at a depth corresponding to the specific sublayer, and measurements. In addition, using this procedure, you can define a main frequency for different zones of the reservoir tank.

The geophones 215 and equipment, neo is required for the collection and recording of seismic data, you can get on a commercial basis from the service GEOVision Geophysical Services from the Department Division of Blackhawk Geometries of Corona, California. This equipment is known to experts in the field of technology and describe its advanced impractical.

The device of the invention is especially effective in the case of four-dimensional display, because the source is regulated with high precision and has a continuous frequency spectrum, and seismic waves are reproduced for significant periods of time. Therefore, data that are incompatible will not be mathematically processed and analyzed to obtain maps to determine the location of the pockets or effectiveness of seismic or other stimulation.

Terms such as “horizontal”, “vertical”, “upward” and “downward”are used when referring to the drawings generally indicate the orientation of the parts in the shown embodiments, implementation, and practical use is not necessary in the described orientation. The device can be used in vertical, inclined or horizontal wells and can be used to intensify the flow of water, steam or other fluid used for formation treatment, and to increase the impact of water and other fluid, in addition to gas, oil and other oil products

Although the present invention is described with reference to preferred at the present time options for implementation, it should be clear that the disclosure should not be interpreted as limiting. Various changes and modifications will become obvious to a person skilled in the art after reading the foregoing description.

1. The way to create a shock wave in the fluid in the well containing the compression portion of the fluid, the sudden release of the compressed fluid remaining in the fluid, thereby creating a compressive shock wave, and the repetition of compression and release of the fluid, characterized in that it comprises the following stages: the location of the device supported by the tubing string and having a chamber and an internal channel in fluid so that the device was immersed in the liquid, while the inner channel and the camera have square cross-sections, the cross-sectional area of the inner channel is less than the cross-sectional area of the chamber; fluid flow into the chamber and into the channel; the movement of the piston in the piston node on the channel to compress the fluid in the chamber; the piston is moved from the channel into the chamber to release the compressed fluid through the channel into the fluid that surrounds the drive piston Assembly includes a piston and a rod passing through the second channel when Platinium with respect to the second channel to provide a seal between the compressed fluid in the chamber and the fluid in the tubing string to isolate the tubing of the column above the camera from the camera.

2. The method according to claim 1,characterized in that the inner channel is immersed in the fluid in the wellbore flowing into the reservoir.

3. The method according to claim 2, characterized in that collect data related to the propagation of seismic waves through the seam, and regulate the characteristics of seismic waves so that their frequency was essentially equal to the fundamental frequency of the layer.

4. The method according to claim 2, characterized in that the rod is a pump rod passing through the tubing column in the well.

5. The method according to claim 4, characterized in that the tubing column has a length defined from the expression

Lt= Nb- 0,5c/f - Lca,

where Nb- the depth of the borehole bottom;

C is the speed of sound in the fluid in the borehole;

f is the fundamental frequency of the reservoir;

Lca- the length of the specified device having a camera and an internal channel.

6. The method according to claim 3, characterized in that the phase adjustment of the characteristics of seismic waves is carried out so that their frequency was essentially equal to the fundamental frequency of the layer, adjust the distance between the lower end of the channel and the bottom of the borehole up to a distance sufficient so that the frequency of the reflected waves when passing back and forth between the lower end of the channel and the bottom hole was essentially equal to the main cha is the Thoth layer.

7. The method according to claim 3, characterized in that the phase adjustment of the characteristics of seismic waves to the natural frequencies of the reservoir contains the following stages: the initial location of the amplifier at the lower end of the channel at a distance from the bottom of a well, located in the specified range; collecting and evaluating seismic data after the release of the compressed fluid at the lower channel into the well; adjusting the distance between the amplifier at the lower end of the channel and the bottom of the borehole up to a distance sufficient so that the frequency of the reflected waves when passing back and forth between the amplifier and the bottom hole was essentially equal to the fundamental frequency of the layer.

8. The method according to claim 1, characterized in that the phase adjustment of the distance between the amplifier at the end of the lower channel of the borehole and the borehole bottom to a distance sufficient so that the frequency of the reflected waves when passing back and forth between the lower end of the channel and the bottom hole was essentially equal to the fundamental frequency of the formation, regulate the length of the sucker rods and tubing of the column to adjust the position of the amplifier in relation to the bottom of the borehole in which it is installed.

9. The method according to claim 3, characterized in that at the stage of collecting data related to propagation of seismic waves through the layer, set the geophones in wells located at distances from the wellbore, in which there is a device having a chamber and an internal channel, and record seismic data received by the geophones.

10. The method according to claim 3, characterized in that the data relating to the propagation of seismic waves through the seam, gather in a place located at a distance within approximately 1 mile to approximately 2 miles from wells, which include a device having a chamber and an internal channel.

11. The method according to claim 3, characterized in that the implement positioning apparatus for collecting seismic data in place at a distance from the specified wells, periodic collection of data for use when executing a three-dimensional simulation of the velocity distribution and the coefficients of reflection and compare the simulated distribution obtained in the first time to simulate the distributions obtained at a later point in time, to create a four-dimensional seismic map layer.

12. The method according to claim 3, characterized in that use a high pressure chamber having a cross sectional area that is greater than the cross-sectional area of the piston.

13. The method according to claim 4, wherein the well is an injection well, and the device having a chamber and an internal channel, installed in the lower part of the injection wells is, contains the following additional steps: setting the packer in the tubing string to isolate the annulus of the well above the packer from the annulus below the packer; the installation of a perforated cylinder below the packer; installing a device having a camera and an internal channel, under the lower part of the perforated cylinder; a fluid flow through tubing string and a perforated cylinder in the annular space of the borehole below the packer and moving the piston from the chamber at the lower channel for discharging the water contained in the chamber, and to release fluid from the annulus injection wells into the chamber to create a second shock wave in the borehole.

14. The method according to item 13, wherein the piston Assembly during upward compresses the fluid contained in the chamber, and releasing fluid from the interior of the chamber in the barrel injection wells.

15. The method according to item 13, wherein the amplitude of A

u
sw
the shock wave at the top of the turn up is determined from the following formula:

where π = 3,14;

T = 60/n;

n is the number of strokes per minute;

b - coefficient gripping the edge of your is on injection water;

Vcchamber size;

P is the pressure inside the chamber;

Dpthe diameter of the piston;

Dis- inner diameter of the sealing device;

Lp- the length of the piston;

Lis- the length of the sealing device;

Vr- the speed of movement of the sucker rods string;

μ is the viscosity of the injection water;

k - coefficient of the liquid displacement piston;

δ - the gap inside the sealing device and between the piston and the lower cylinder.

16. The method according to item 13, wherein the piston Assembly in the course of down disperse the liquid contained in the chamber, and releasing fluid from the annulus into the chamber when the piston is pulled out from the bottom of the channel.

17. The method according to item 16, characterized in that the amplitude A

d
sw
the second shock wave at the lowest point of the turn down is determined from the following formula:

where ρwis water density;

βa- the content of air/gas in the pressurized water;

Vwith- volume of the vacuum chamber;

Dpthe diameter of the piston;

Dis- inner diameter of the sealing device;

k is the adiabatic coefficient;

Lstr- stroke;

g - free fall acceleration;

Hlcthe depth of the bottom of the cylinder.

18. The method according to claim 2, characterized in that well represents an inclined hole, and the device having the chamber and the inner channel is set to non-vertical portion of the inclined hole.

19. How to create seismic waves in the oil-bearing formation containing a compression of the fluid in the borehole, the sudden release of the compressed fluid in the remaining liquid in the well, thereby creating a compressive shock wave, and the repetition of compression and release of the fluid, characterized in that it comprises the following stages: the location of the well site, the cylinder having a pressure chamber and upper and lower inner channels communicated with the camera, so that the node of the cylinder is supported by the booster casing and immersed in the liquid in the well; the location of the piston so that the rod on the piston node passes through the upper channel and provides seal the top of the channel to provide a seal between the chamber and the fluid in the tubing string to isolate the tubing of the column above the camera from the camera, and the piston performs a reciprocating motion in the lower channel and is drawn into the chamber; the implementation is of the reciprocating motion of the rod and piston so that what if you move the rod and piston, the liquid in the chamber is compressed, and when the piston is moved from the lower channel in the camera compressible fluid produced through the lower channel in the well.

20. The method according to claim 19, characterized in that use a high pressure chamber having a cross sectional area that is greater than the cross-sectional area of the piston.

21. The method according to claim 19, characterized in that the node cylinders feature near the bottom of the well.

22. The method according to claim 19, wherein the well is partially filled with fluid.

23. The method according to claim 19, characterized in that exercise movement of the piston from the pressure chamber into the lower channel for discharging the water contained inside the pressure chamber, and for releasing water from the well into the chamber when the piston is moved from the lower channel in the well.

24. The method according to claim 19, characterized in that the amplitude of the shock wave created when the piston is moved from the lower channel in the camera, is determined from the following formula:

where π = 3,14;

T = 60/n;

n is the number of strokes per minute;

b is the coefficient of compressibility of the pumped water;

Vc- volume of the vacuum chamber;

P is the pressure inside the vacuum chamber;

Dpthe diameter of the piston;

Dis- inner diameter of the sealing device;

Lp- the length of the piston;

Lis- the length of the sealing device;

Vr- the speed of movement of the sucker rods string;

μ is the viscosity of the injection water;

k - coefficient of the liquid displacement piston;

δ - the gap inside the sealing device and between the piston and the lower cylinder.

25. The method according to item 23, wherein the amplitude of the shock wave created when the piston is moved from the lower channel in the borehole is determined from the following formula:

where ρwis water density;

βa- the content of air/gas in the pressurized water;

Vc- volume of the vacuum chamber;

Dpthe diameter of the piston;

Dis- inner diameter of the sealing device;

k is the adiabatic coefficient;

Lstr- stroke;

g - free fall acceleration;

Hlcthe depth of the bottom of the cylinder.

26. The method according to claim 19, characterized in that collect data related to the propagation of seismic waves through the layer, and adjusting the characteristics of seismic waves so that their frequency was essentially equal to the fundamental frequency of the layer.

27. The method according to p, characterized in that the phase adjustment feature is istics of seismic waves, to their frequency was essentially equal to the fundamental frequency of the layer, adjust the distance between the lower end of the channel and the bottom of the borehole up to a distance sufficient so that the frequency of the reflected waves when passing back and forth between the lower end of the channel and the bottom hole was essentially equal to the fundamental frequency of the layer.

28. The method according to p, characterized in that the phase adjustment of the characteristics of seismic waves so that their frequency was essentially equal to the fundamental frequency of the reservoir, contains the following stages: the initial location of the amplifier at the lower end of the channel at a distance from the borehole bottom, not less than 200 feet; collection and assessment of the seismic data after releasing the compressed fluid in the lower channel into the well; adjusting the distance between the amplifier at the lower end of the channel and the bottom of the borehole up to a distance sufficient so that the frequency of the reflected waves when passing back and forth between the lower end of the channel and the bottom hole was, essentially equal to the fundamental frequency of the layer.

29. The method according to p, characterized in that the amplifier is set at a distance from the bottom of a well defined from the following formula

S = c/2f

where C is the speed of sound in the liquid contained in the borehole;

f is the fundamental frequency of the layer.

30. The method according to p, characterized in that the phase regulation is ovci characteristics of seismic waves before reaching the natural frequencies of the layers contains the initial location of the lower end of the amplifier at a distance from the borehole bottom, in the range of 300 to 400 feet.

31. Device for creating a shock wave in the fluid in the wellbore containing alluvial-compressor column, passing in the wellbore, the site of the cylinders connected to the tubing string and containing an elongated internal chamber having an upper channel and a lower channel, the upper channel has a cross sectional area which is less than the cross-sectional area of the lower channel, the means for positioning the node of the cylinder so that it was submerged in the liquid in the well bore, and the inner chamber was filled with liquid, a piston Assembly including a seal in contact with the upper channel to provide a seal between the compressed fluid in the chamber and the fluid in the tubing string in the well above the chamber from the liquid in the chamber, and the lower piston mounted in the lower channel can be moved into the internal chamber to compress parts of the liquid contained in the inner chamber, and releasing the fluid in the well bore when the piston is moved along the lower channel into the internal chamber, pumping means connected to the piston unit for moving the piston within the cylinders node.

32. The device according to p, wherein the piston Assembly comprises upper and lower pistons installed with possibly the grassroots movement in the internal chamber to compress parts of the liquid in the inner chamber during upward and a check valve on the lower piston, is arranged to open when the course down for releasing the fluid in the inner chamber, and the site of the cylinders connected to the tubing string contains upper cylinder having a specified upper channel adapted to accommodate the upper piston lower cylinder below the top of the cylinder that has the specified lower channel and configured to accommodate the lower piston, the lower channel has a cross sectional area that is larger than the cross-sectional area of the upper channel, the lower cylinder also has the lower end of the containing hole, cylinder compression, forming a specified internal chamber and located between the upper and lower cylinders, and a transfer cylinder located between the lower cylinder and cylinder compression.

33. The device according to p, characterized in that the pump means connected with the piston node, configured to move the piston from a node of the cylinder at the lower channel for discharging the liquid contained inside the node of the cylinder, and allow release of fluid contained in the well bore, cylinders node.

34. The device according to p, characterized in that the tubing column, passing in the borehole has a length defined and the following formula:

Lt= Nb- 0,5c/f - Lca,

where Nbthe depth to the bottom of the borehole;

C is the speed of sound in the fluid in the wellbore;

f is the fundamental frequency of the reservoir;

Lca- the length of the cylinders node.

35. The device according to p, wherein the well is an injection well, additionally containing a packer placed in the tubing string, the perforated cylinder, located in the tubing string below the packer sealing means connected between the perforated cylinder and the junction of the cylinder for the flow of the liquid in the tubing string and through the perforated cylinder in the well bore below the packer, and an amplifier connected to the node of the cylinder and positioned to block the passage of the shock waves pass amplifier.

36. The device according to p, characterized in that it further comprises a control cylinder connected between the node of the cylinder and booster, to prevent erosion of the cylinders node & amp liquid flowing in and flowing from the inner chamber.

37. The device according to p, wherein the piston Assembly includes a pump rod connected to the seal, and a stabilizing rod that is connected with the pump rod, and the piston connected to stabilizirawe the rod, posted by can travel in the inner chamber and in the lower channel.

38. The device according to p, characterized in that the lower cylinder is located below the blowout of the cylinder and has an inner channel configured to accommodate the piston.

39. The device according to § 38, characterized in that the blowout of the cylinder has an inner diameter determined from the following formula:

where IDpc- inner diameter blowout of the cylinder;

Dpthe diameter of the cylinder;

IDc- internal size of the vacuum chamber;

ρwis water density;

g - free fall acceleration;

N - depth blowout of the cylinder;

Pdis the saturated vapor pressure;

ξ is the coefficient of hydraulic resistance;

P is the pressure inside the vacuum chamber.

40. The device according to p, characterized in that the amplifier with an inner diameter varying in accordance with the expression Ida(x) = Dpexp(xα/2), has a length defined from the following formula:

I = α/(2m2- α2),

where m = (α2- k2)1/2,

k = ω/s

ω - repetition frequency shock waves;

C is the speed of sound in water;

the - the current length of the amplifier;

α - constant.

41. The device according to clause 37, characterized in that the pump rod has a radius of drnot less than

where ρwis water density;

ρs- the density of steel;

β - the content of air/gas in the pressurized water;

Vc- volume of the vacuum chamber;

Dpthe diameter of the piston;

Dis- inner diameter of the sealing device;

k is the adiabatic coefficient;

Lstrthe stroke length.

42. The device according to clause 37, characterized in that the roll bar has a length defined from the following formula:

where Lsr- the length of the stabilizing rod;

π = 3,14;

I - the main Central radius of gyration of the cross section of the middle rod;

dsrthe average diameter of the rod;

E - the modulus of elasticity of the material of the rod;

P is the pressure inside the vacuum chamber;

Dpthe diameter of the piston;

Dis- inner diameter of the sealing device;

n - factor.

43. The device according to clause 37, wherein the piston has a narrowing at both ends with angle α not less than 10°and Rel is a solution of length L tnarrowing to a diameter of Dpthe piston is not greater than 0.5.

44. The device according to § 38, characterized in that the length of the lower cylinder is determined from the following formula:

where Llc- length of the lower cylinder;

Lstr- stroke;

Lr- the length of the sucker rod Assembly;

Dpthe diameter of the piston;

Dis- inner diameter of the sealing device;

E - the modulus of elasticity of the material of the rod;

Puthe pressure inside the vacuum chamber during upward;

g - free fall acceleration;

ρwis water density;

ρs- the density of steel;

Lp- the length of the piston.

45. Device for creating a shock wave in the wellbore containing tubing column, passing down into the wellbore, the site of the cylinders connected to the tubing string and containing an elongated internal chamber, means for filling liquid of the wellbore and the inner chamber, a piston Assembly, including upper and lower pistons mounted for movement within the chamber to compress parts of the liquid contained in the inner chamber, and releasing the fluid in the wellbore, and pumping means connected with the piston node, to move the piston the evil inside host cylinders, characterized in that the node of the cylinder contains an upper cylinder having an inner channel configured to accommodate the top of the piston, the lower cylinder below the top of the cylinder and having an inner channel configured to accommodate the bottom of the piston and having a cross sectional area that is greater than the cross-sectional area of the inner channel of the upper cylinder and lower cylinder also has the lower end of the containing hole, cylinder compression, forming a compression chamber located between the upper and lower cylinders, and a transfer cylinder located between the lower cylinder and cylinder compression.

46. The device according to item 45, wherein the lower piston has a cross sectional area greater than the cross-sectional area of the upper piston.

47. The device according to item 46, wherein the lower piston includes an upper portion having a generally smooth outer perimeter, and the lower part, with many flow channels.

48. The device according to p, characterized in that the lower piston is capable of moving between a first position in which the upper part of the lower piston is at least partially located within the lower cylinder, and a second position in which the lower part of the bottom of the piston at least partially is GNC the ri transition of the cylinder.

49. The device according to p, wherein the pumping means includes a rocker connected with the piston sub-Assembly for reciprocating movement of the piston between the first and second positions.

50. The device according to § 49, characterized in that the upper piston is rigidly connected with the lower piston via a connecting rod.

51. The device according to item 50, wherein the lower piston includes passing the flow means to allow flow of fluid upward through the lower piston in the compression chamber when moving the lower piston down in the cylinders node.

52. The device according to § 51, wherein passing the flow means includes an internal channel through the lower piston, and a ball placed so that they can move in the piston near the inner channel, resulting in moving up the bottom of the piston in the site cylinder ball closes the inner channel to prevent the passage of fluid through the lower piston, and when moving down the bottom of the piston in the site cylinder ball releases the channel, resulting in the possibility of leakage of liquid through the lower piston in the compression chamber.



 

Same patents:

FIELD: oil and gas extractive industry.

SUBSTANCE: method includes forming of gas pillow by forcing gas into inter-tubular space. Further pushing liquid is forced therein with forcing away of liquid from inter-tubular space along tubing column into tank or store, pressure is dropped from inter-tubular space down to atmospheric and hydro-impact is used to effect well face by rotating liquid flow from tubing column. Pillow is formed by plant for forcing pushing liquid and gases. As gas, mixture of air and exhaust gases is used in relation no greater than 2:3. pillow pressure provides for prevention of gas from getting into tubing column. Volume of pushing liquid is determined from formula: Vpl=0.785.(d

21
-d22
).(HT-Hgp-Hi-t).10-6, where d1 - inner diameter of casing column, mm; d2 - outer diameter of tubing pipes, mm; HT - depth of lowering tubing column in well, m; Hgp - height of gas pillow in inter-tubular space, m; Hgp=K·Pgp; K - hydrostatic coefficient of resistance to pushing of liquid and gas (K=100 m/MPa), m/MPa; Pgp - end pressure of gas pillow, MPa; Hi-t - inter-tubular space height.

EFFECT: higher safety, higher efficiency.

3 cl, 2 dwg, 2 ex, 1 tbl

FIELD: oil and gas production.

SUBSTANCE: groups of high intake- and low intake-capacity injecting wells are chosen in a single hydrodynamic system and, for each well, oil reservoir properties and permissible degree of pollution of fluid received by high intake-capacity wells are determined. When fluid from low-permeable oil reservoir flows off through high intake-capacity wells, this fluid is cleaned to permissible degree of pollution.

EFFECT: reduced losses in intake capacity of formations and increased time between treatments of wells.

1 dwg

FIELD: oil and gas extractive industry.

SUBSTANCE: device has pipe-like body with detachable upper and lower sleeves. Concentrically to body, with possible rotation relatively to it, a cover is mounted with blades with scrapers placed spirally on its surface. To lower sleeve a reactive end piece is connected with slit apertures. End piece hollow is filled with granulated material engaging in exothermal reaction with acid. Lower portion of end piece is provided with check valve. Upper sleeve is provided with check valve having locking element in form of sphere with shelf and centering elements, to be dropped from well mouth. Base of saddle of check valve is made in form of disc having diameter equal to diameter of body. Pass aperture of saddle in lower portion is overlapped with easily destructible and easily removed element. Length of sphere shelf is greater than height of pass aperture of saddle of check valve of upper sleeve.

EFFECT: higher reliability, higher efficiency, broader functional capabilities of device.

3 cl, 4 dwg, 1 tbl

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FIELD: oil and gas extractive industry.

SUBSTANCE: device has pipe-like body with detachable upper and lower sleeves. Concentrically to body, with possible rotation relatively to it, a cover is mounted with blades with scrapers placed spirally on its surface. To lower sleeve a reactive end piece is connected with slit apertures. End piece hollow is filled with granulated material engaging in exothermal reaction with acid. Lower portion of end piece is provided with check valve. Upper sleeve is provided with check valve having locking element in form of sphere with shelf and centering elements, to be dropped from well mouth. Base of saddle of check valve is made in form of disc having diameter equal to diameter of body. Pass aperture of saddle in lower portion is overlapped with easily destructible and easily removed element. Length of sphere shelf is greater than height of pass aperture of saddle of check valve of upper sleeve.

EFFECT: higher reliability, higher efficiency, broader functional capabilities of device.

3 cl, 4 dwg, 1 tbl

FIELD: oil and gas production.

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EFFECT: reduced losses in intake capacity of formations and increased time between treatments of wells.

1 dwg

FIELD: oil and gas extractive industry.

SUBSTANCE: method includes forming of gas pillow by forcing gas into inter-tubular space. Further pushing liquid is forced therein with forcing away of liquid from inter-tubular space along tubing column into tank or store, pressure is dropped from inter-tubular space down to atmospheric and hydro-impact is used to effect well face by rotating liquid flow from tubing column. Pillow is formed by plant for forcing pushing liquid and gases. As gas, mixture of air and exhaust gases is used in relation no greater than 2:3. pillow pressure provides for prevention of gas from getting into tubing column. Volume of pushing liquid is determined from formula: Vpl=0.785.(d

21
-d22
).(HT-Hgp-Hi-t).10-6, where d1 - inner diameter of casing column, mm; d2 - outer diameter of tubing pipes, mm; HT - depth of lowering tubing column in well, m; Hgp - height of gas pillow in inter-tubular space, m; Hgp=K·Pgp; K - hydrostatic coefficient of resistance to pushing of liquid and gas (K=100 m/MPa), m/MPa; Pgp - end pressure of gas pillow, MPa; Hi-t - inter-tubular space height.

EFFECT: higher safety, higher efficiency.

3 cl, 2 dwg, 2 ex, 1 tbl

FIELD: oil industry.

SUBSTANCE: device has pump, placed on well mouth equipment, tubing string, passing downwards in casing string of well. Node of hollow cylinders is connected to lower portion of tubing string. A couple of pistons is placed inside cylinders node and connected to pump via pump bars and gland rod. For compression of liquid within cylinders node, pump is enabled. Compressed liquid is outputted into casing column, and strike wave is formed as a result. Cylinders node includes upper cylinder, lower cylinder. Transfer cylinder is placed below upper and above lower cylinders. Cylinder with compression chamber is placed between transfer cylinder and upper cylinder. Lower cylinder is made with possible placement of lower piston, and upper cylinder is made with possible placement of upper piston. Lower piston has larger diameter, than upper piston. Displacement of piston affects volume of compression chamber, decreasing it. Liquid in the chamber is compressed. During downward movement of piston liquid is lowered into well. Seismic data from wells at remote locations are gathered and processed.

EFFECT: higher efficiency.

4 cl, 9 dwg

FIELD: oil industry.

SUBSTANCE: device has receiving chamber with solid-fuel charges and igniter, combustible plug and air chamber with atmospheric pressure. Receiving chamber is perforated along whole length by apertures for outlet of combustion products. Charge adjacent to upper end of receiving chamber burns from its end. It is made of heat-resistant low-gas slow-burning compound with high temperature of combustion products and high caloricity, with low dependence of burning speed from pressure and it is protected from burning at side surface by compound preventing burning thereon, but burning together with charge. Charge, adjacent to plug, is of channel construction, quick-combustible, and it is made of heat-resistant gas-generating compound. Igniter is mounted in upper end of charge, adjacent to upper end of receiving chamber. Air chamber with atmospheric pressure is placed below receiving chamber.

EFFECT: higher efficiency.

2 cl, 1 dwg

FIELD: oil industry.

SUBSTANCE: device for complex treatment of face-adjacent well zone has thermal gas-generator charged with fuel with electric igniter and pipe-shaped container with acid solution, made with perforation apertures, both mounted on rope-cable. Acid solution is positioned in thermal-melting hermetic tank inside the container. Device is additionally provided with depression chamber and impact-wave effect chamber, containing remotely controlled fast-action locks, with two packers, mounted at ends of pipe-shaped container. Packers are opened under pressure from gases from gas generator. After operation of gas generator is finished, packers release pipe-shaped container. Depression chamber, impact-wave effect chamber and gas generator are jointly connected.

EFFECT: higher efficiency.

2 cl, 1 dwg

FIELD: oil industry.

SUBSTANCE: method includes determining dominating frequency of productive bed by performing prior vibration-seismic action using surface oscillations source at different frequencies and analysis of seismic graphs from seismic receivers in product wells. Vibration-seismic effect on watered portion of productive bed of oil deposit is performed by a group of surface oscillations sources, operating at dominating frequency of productive bed. Bed fluid is extracted via product wells. After vibration-seismic effect on watered portion of productive bed of oil deposit by a group of surface oscillations sources, operating at domination frequency of productive bed, concurrent vibration-seismic effect is performed using two sub-groups of said group of surface oscillation sources. Each sub-group of group operates at determined from mathematical dependence. Average frequency of surface oscillations sources of whole group is equal to dominating frequency of productive bed. Difference in frequencies, on which each sub-group operates, is determined in accordance to linear size of watered portion of productive bed of oil deposit and is satisfactory to mathematical dependence. Concurrent vibration-seismic effect by two sub-groups of said group of surface oscillations sources is performed with forming of wave having length exceeding length of wave with dominating frequency.

EFFECT: higher oil yield.

2 ex

FIELD: mining industry.

SUBSTANCE: processing periods include forming of depression pressure change between well-adjacent bed zone and well hollow. Cleaning of well-adjacent bed zone is performed by prior feeding of fluid into well, forming of periodic pressure pulses in well-adjacent bed zone in form of fading standing wave, moving along the well, and decreasing pressure during fluid movement along well from well-adjacent bed zone to day surface for extraction of clogging. Plant for washing wells is used, which is connected to behind-pipe space of well and to tubing pipe. Behind-pipe space of well is isolated by packer along lower limit of perforation range. Perforation range is filled with sedimentation, formed from destroyed rock, and accumulated above packer as a result of gradual and even cleaning of well-adjacent bed zone along whole length of perforation range. Packer is disabled and well is washed clean, without raising tubing pipes column.

EFFECT: higher efficiency.

1 dwg, 1 ex

FIELD: oil industry.

SUBSTANCE: method includes pulse treatment of productive bed by energy of atmospheric electricity by using lightning discharge. Prior to initialization of storm discharge voltage of electric field above well is measured using measuring block. Initiation of storm discharge is performed when reaching value of strength of electric field above well no less than 30 kV/m and enough for forming leading channel of lightning. To exclude corona as receiver of electric energy metallic mast is used, on upper end of which metallic fragment of spherical form is positioned having smooth external surface, or smooth metallic wire is used with its possible raising towards storm cloud. Output of receiver is connected to casing column of well. Powerful electric discharge along casing column and through its perforated portion gets into area of productive bed and disperses there.

EFFECT: simplified method, simplified construction of device, higher product yield.

2 cl, 1 dwg

FIELD: oil production, particularly to stimulate oil extraction under difficult field development conditions, particularly in the case of carbonate formation treatment.

SUBSTANCE: method involves forming new cracks and/or stimulating existent ones in production bed by serially well flushing and performing periodical depressive and repressive actions along with flushing thereof at circulation or outflow stages; isolating interval to be treated with packer; cyclic changing pressure with following injecting working liquid, for instance oil and/or at least one plug of chemical agent, for example of hydrochloric acid. All above operations are performed along with oscillating action of radiator installed in front of production bed interval to be treated.

EFFECT: increased intensity of production bed treatment and extended operational functionality.

23 cl, 2 ex

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