A device for processing bottom-hole zone of the well

 

The invention relates to the oil and gas industry and is designed to improve the productivity of wells by bottomhole zone treatment. The device comprises a sealed air chamber with the atmospheric pressure receiving chamber with sealed holes on the side surface in the cavity where flammable solid composite material, consisting of several parts. On the end surfaces of the main part of a combustible solid composite material of the cylindrical pieces of the same material with armored end surfaces and axisymmetric channel each. The channel checkers facing the air chamber is a metal spring. The outer end pieces fixed metal ring and sealing gasket on the outer side of which is a metal disk. Between the ends of the pieces and the main body, facing each other, there is a metal grille, outer diameter which is less than the internal diameter of the ring. To the center of the grid with one end attached to a metal spring, the other end of the spring attached to the deadlift, located in the center of the metal disk. External torontotoro is a sealing gasket and a metal disk. The case of the reception chamber may be made of metal or high impact plastic. Metal spring can also be set and similarly secured in the channel checkers, facing the hole. Increases reliability of the device by improving the sealing of the ends and create adjustable free volume in the receiving chamber. 2 C.p. f-crystals, 1 tab., 1 Il.

The invention relates to the oil industry, in particular, to a device for increasing the productivity of wells by bottomhole zone treatment.

The known device for processing bottom-hole zone of the well by the method of implosion.

One of them is a sealed chamber in the form of a metal casing filled with air under atmospheric pressure. In the lower part of the casing is closed by a membrane fixed with the help of the reception chamber - nipple. The upper end of the housing implosion chamber, sealed by a plug-adapter, allows you (also) to make the descent of the device into the well on tubing (Popov A. A. impact on bottom-hole zone of the well. - M.: Nedra, 1990, S. 35-36). The device fits the lower part of the front of the processed layer.a wound. Downhole fluid instantly rushes inside air (implosion) of the chamber with atmospheric pressure, creating an implosion (depression) in the pit. This leads to intense flow of fluid from a reservoir, facilitating cleaning of the bottom-hole zone from contamination - the deposition of paraffin, resins, solid particles, etc., on the other hand, after the creation of the implosion, the column of well liquid falls to the bottom, and forms a hydraulic shock, which contributes to the expansion of existing and formation of new cracks in the bottomhole formation zone and, ultimately, to increase its reservoir properties.

Lack of work of the device is the difficulty of carrying out the process of implosion which seal the pores of the formation of deposits of paraffin, resins and asphaltenes having a high viscosity and adhesion to the surface of the rock pores, which leads to insufficient cleansing of the pores of the formation in the wellbore area from contamination. In addition, when working with the device difficulties that reduce the performance of work associated with the need for more engagement with the device and squeezing Assembly at the wellhead to create bottom-hole pressure rupture of the membrane.

Known impositionem and the receiving chamber (Perforating-explosive equipment. Handbook Ed. of Frilander L. J. M.: Nedra, 1990, S. 181-184).

The device is lowered into the well through the cable and installed in the processing interval of the formation. After filing through the cable of the electrical impulse triggers the explosive cartridge, destroying the diaphragm, which separates the air (implosion) the camera from the reception. The result is a flow of liquid from the reservoir into the well with the effect of the bottomhole zone treatment, similarly to the above effect of the previous device.

The advantage of this device is that the destruction of the diaphragm using an explosive cartridge of the device eliminates the additional step of creating an excessive pressure with squeezing unit at the wellhead for the destruction of the diaphragm.

The disadvantages of the device include the fact that its use does not eliminate the difficulty of carrying out the process of implosion deposits in the pores of the reservoir type of wax, resins and asphaltenes having a high viscosity and adhesion to the surface of the rock pores, which does not ensure the completeness of the cleansing of the pores in the bottomhole formation zone from contamination. In addition, during operation of the device creates an increased risk associated with use of mehanicheskij effects.

The closest the present invention is a device for processing bottom-hole zone of the well, comprising a sealed air chamber, a receiving chamber in which is placed a combustible solid composite material consisting of two parts. The first part facing the air chamber formed of durable and malagasay allocation during the combustion of the composition and has a side facing to the second part, the cavity filled with a mixture of the compositions of the first and second parts. Last curb material from by the combustion of gas-generating compositions, on the plot on which the side surface of the housing of the receiving chambers are pre-sealed openings (U.S. Pat. Of the Russian Federation No. 2075597, IPC E 21 IN 43/25, BI No. 8 of 20.03.97).

The device operates as follows.

Sealed air (implosion) camera connected to the receiving chamber filled with combustible solid composite material, put the cable wire into the bottom hole so that the receiving chamber was placed opposite the interval of the processed layer. From the wellhead through the cable serves an electrical impulse to the igniter combustible solid composite material, kotoryaaya deposits, at the end of the combustion downhole pressure opens the air (implosion) camera. The result is a flow of liquid from the reservoir into the well with the effect of thermal and implosive processing.

The advantage of the device of the prototype is that it uses non-explosive combustible solid composite material and implosive processing combined with thermal.

The disadvantages of the device include the fact that in the process of conducting round-trip works the end of the reception chamber, facing the hole, and its side surface with the holes facing significant mechanical effects in the form of bumps on the borehole wall, apply the end-face mechanical impurities contained in the well fluid. In the result of which can disrupt the sealing layer, and downhole fluid under high pressure into the cavity of the reception chamber, where is the igniter and combustible solid composite material. This leads to the loss of the initial physico-mechanical properties of the igniter composition and a combustible material, i.e. its ability to ignite and burn. Depending on the degree of initial violations sealing layer schistosity combustible material, then penetrates herself. The impact of downhole pressure on the sealing gasket may also lead to a reduction in the length of the charge due to the seal combustible material (increasing density due to residual porosity of charge), which leads to the shift of the combustible material in the receiving chamber and the above-described consequences. At the initial moment of ignition and combustion of the combustible solid composite material formed of high-temperature combustion products do not have the possibility of entering into the well, therefore, the pores present in the combustible solid composite material, they are distributed throughout the volume of the inlet chamber, creating new sources of ignition and combustion. In the result, until depressurization of the lower end or holes on the side of the pressure in the receiving chamber increases rapidly and significantly exceeds the borehole, which not only leads to depressurization of the lower end and side openings in the inlet chamber, and a partial or complete depressurization of the upper end of chamber, and the flow of the well fluid or filtered by the resulting damage (channels) flammable solid composite material implosion in camera or as camera. In either case remains solid combustible composite material prevents movement of the upward flow of the well fluid, i.e., reduce the efficiency of implosion device.

The objective of the invention is to increase the reliability of the device by improving the sealing of the ends of the receiving chamber and creating an adjustable free volume in the receiving chamber, which contributes to a smooth, not sharp increase of pressure at the moment of ignition.

The problem is solved by the development of devices for processing bottom-hole zone of the well, comprising a sealed air chamber with the atmospheric pressure receiving chamber with sealed holes on the side surface in the cavity where flammable solid composite material, consisting of several parts and having a composition, the combustion of which are allocated only gaseous products. And on the end surfaces of the main part of a combustible solid composite material of the cylindrical pieces of the same material with armored end surfaces and axisymmetric each channel in the channel checkers facing the air chamber, is Metallica side of which is a metal disk, between the ends of the pieces and the main part, facing each other, there is a metal grille, outer diameter which is less than the internal diameter of the ring to the center of the lattice with one end attached to a metal spring, the other end of the spring attached to the deadlift, located in the center of the metal disk, the outer side end surface of checkers, facing the hole, fixed metal ring, on the outer side of which is a sealing gasket and a metal disk. The case of the reception chamber is made of metal or high impact plastic. When working with the device in deep wells to improve the sealing of the bottom of the reception chamber in the channel checkers, facing the hole, can also be installed and similarly fixed metal spring.

The drawing shows a General view of the proposed device in section. The device equipped with cable head (1) has a sealed air chamber (2) connected to the receiving chamber (3), inside which there is a combustible solid composite material (4, 7), at the end of the main part (4) facing in the hole, installed the igniter (5). The case of the reception chamber has predvaritelnyy (4) has two parts combustible solid composite material (7), which are made in the form of a cylindrical checkers with axisymmetric channel and reserved end surfaces. The channel checkers facing the air chamber is a metal spring (8). The outer end surface of the cylindrical checkers fixed metal rings (9) and sealing washers (10). On the outer side of the rings and sealing gaskets are metal disks (11). Between the ends of the pieces (7) facing the air chamber, and the main part (4) facing each other, is a metal grating (12), the outer diameter of which is smaller than the inner diameter of the metal ring to the center of the grid is rigidly attached one end of a spring (8), the second end of the spring attached to the deadlift (13) located in the center of the metal disk (11).

The device operates as follows. Sealed air (implosion) camera (2), connected to the receiving chamber (3), curb combustible solid composite material (4, 7) and cable head (1), put the cable wire into the bottom hole so that the receiving chamber was placed opposite the interval of the processed layer.

From the wellhead through the cable system serves the traditional material. In the layer-by-layer burning combustible solid composite material on the end surface of the main part and the diameter of the axisymmetric cylindrical channel checkers installed in the lower part of chamber, formed by high-temperature gaseous combustion products, which create a pressure in the free volume of the receiving chamber and destroy the sealing of the bottom end and side holes of the reception chamber. In the further layer-by-layer burning combustible solid composite material is heated gases leaving through the side holes and the end surface, creating in the field of processing interval increased pressure and penetrate into the pores and cracks of the bottomhole zone, melting them in pollution in the form of paraffin - and asfaltenovyh sediments. At the end of combustion of the main part of the high-temperature combustion products pass through a metal grate in the axisymmetric cylindrical channel checkers installed in the upper part of chamber, and ignite its surface. In the layer-by-layer burning on the surface of the channel diameter of the channel is increased, and when the achievement of equal diameter to the diameter of the metal lattice spring is compressed, the release is authorized) cameras. By the time of the disclosure air (implosion) camera gaseous products formed during combustion of a combustible solid composite material, pushed through the side openings of the inlet chamber of the downhole fluid that fills the chamber through its lower open end, so before the upward flow of the well fluid no gaseous products of combustion, which reduces the likelihood of water hammer.

As a combustible solid composite material in the device using the composition, the combustion of which are practically only gaseous products, providing disclosure of pre-sealed side openings in the inlet chamber, and the pressure in the processing interval for the penetration of hot gases in the pores and cracks of the bottomhole zone. The presence in the combustion products of solid particles is impractical because of the possibility of clogging their pores and cracks formation. For example, you can use composition applied to the device prototype based on granulated ammonium nitrate and epoxy resin with the following ratios, wt.%: ammonium nitrate Prill grade B, GOST-2-85 - 72; Birnie thermodynamic and explosive characteristics of the composition given in the table.

Placed in the top and bottom of the reception chamber cylindrical pieces with axisymmetric channel, metal grille, metal spring, metal ring, sealing gasket, metal disks, perform the device the following interrelated features:

additional sources of temperature and gases formed during the combustion of solid composite material;

increase the tightness of the lower end of chamber against ingress of well fluid during the operation of the run and set in the range of bottomhole zone treatment, when there is a difference between atmospheric pressure and the pressure of the fluid in the borehole;

increase the tightness of the upper end of chamber against ingress of combustion products and the downhole fluid in the air (implosion) the camera before the end of the process of burning combustible solid composite material;

the opening of the upper end of the receiving chamber is performed by compressing the spring when the achievement of equal diameter to the diameter of the metal lattice and does not depend on the downhole pressure;

the presence of adjustable free volume in the lower part of primeneniya and burning combustible solid composite material.

This complex functions in the proposed device allows to increase the reliability and efficiency of processing bottom-hole zone of the well.

Claims

1. A device for processing bottom-hole zone of the well, comprising a sealed air chamber with the atmospheric pressure receiving chamber with sealed holes on the side surface in the cavity where flammable solid composite material, consisting of several parts and having a composition, the combustion of which are allocated only gaseous products, characterized in that on the end surfaces of the main part of a combustible solid composite material of the cylindrical pieces of the same material with armored end surfaces and axisymmetric each channel, the outer ends of the sticks fixed metal rings and sealing gaskets, they are metal disks in the channel checkers, facing the air chamber is a metal spring between the ends of this checkers and the main part of the combustible material, facing each other, there is a metal grille, outer diameter which Meisner springs attached to deadlift located in the center of the metal disk.

2. The device under item 1, characterized in that the housing of the receiving chamber are made of metal or high impact plastic.

3. Device according to one of paragraphs.1 and 2, characterized in that the channel checkers, facing the hole, can also be installed and similarly fixed metal spring.

 

Same patents:

The invention relates to the oil and gas industry, namely, development wells, including those equipped with packer

The invention relates to mining and can be used for development and rehabilitation of well production wells, reduced due to clogging of wellbore zone of asphalt formations and solids

The invention relates to the oil industry and can be used for stimulation of oil by melting and removing from the bottom zone of asphalt-resin and paraffin deposits

The invention relates to the oil and gas industry

The invention relates to mining and can be used for development and rehabilitation of well production wells, reduced due to clogging of wellbore zone of asphalt formations and solids

The invention relates to the oil and gas industry, namely exploration wells with open face, including those equipped with packer

The invention relates to the drilling, development and operation of wells in gas condensate fields and is designed for safe working practices during the development wells

The invention relates to the field of construction and operation of wells, in particular for the development and rinsing after their construction, repair, and improve oil recovery
The invention relates to the oil industry and can be used in well stimulation

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.

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: 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

Up!