Device for effecting face-adjacent zone of productive wells bed

IPC classes for russian patent Device for effecting face-adjacent zone of productive wells bed (RU 2249686):

E21B43/25 - Methods for stimulating production (dump bailers E21B0027020000; vibration generating arrangements E21B0028000000; chemical compositions therefor C09K0008600000)

Another patents in same IPC classes:

Method and device for affecting beds, containing liquid substances / 2249685
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.

Method for cleaning face-adjacent bed area / 2246610
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: V_pl=0.785^.(d21

-d22

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

Method of treating bottom zone of injecting wells / 2244113
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.

Device for treating well walls within range of productive bed / 2244112
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.

-d22

Device for effecting face-adjacent zone of productive wells bed / 2249686
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.

Device for complex treatment of face-adjacent well zone / 2253011
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.

Method for extraction of water-clogged oil deposit / 2255212
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.

Method for processing well-adjacent bed zone / 2255214
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.

Method for speeding up extraction of hydrocarbons and device for its realization / 2256072
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.

Production bed treatment method / 2258803
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.

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

The invention relates to the oil industry and can find application in the creation of devices for processing bottom-hole zone of the reservoir wells.

Design of devices for processing bottom-hole zone of the reservoir widely known:

EN 2138630 C1, 29.03.99; EN 2114984 C1, 10.07.98; EN 2072421 C1, 27.01.97;

EN 2075597 C1, 20.03.97; EN 2088751 C1, 27.08.97; EN 2039221 C1, 09.07.95;

Perforating-explosive equipment. Handbook edited by Friedlander L.Y., M., Nedra, 1990;

Popov A. A. impact on bottom-hole zone wells, M., Nedra, 1990;

A.A. Popov implosion in the process of production, M., Nedra, 1996;

Chazov GA, Azamatov VI, Yakimov SV, Savich A.I. Termoliticheskogo impact on marginal wells, M., Nedra, 1980.

A device for processing bottom-hole zone of the well, comprising a sealed chamber 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 body chamber is sealed by a plug-adapter, allowing the descent of the device into the well on tubing.

The device is installed the lower part of the front of the processed layer. Then, by injection into a well and squeezing the liquid out of the machine at the wellhead create pressure, RA is destructive membrane. Downhole fluid instantly rushes inside air (implosion) of the chamber with atmospheric pressure, creating a depression on the bottom. This leads to intense flow of fluid from a reservoir, facilitating cleaning of the bottom-hole zone from contamination - the deposition of paraffin, resins, particulate matter, etc. on the other hand, after you create the implosion of 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 (A.A. Popov impact on the bottom zone wells, M., Nedra, 1990, p.35-36).

The disadvantage of this 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.

Closest to the invention is a device for processing bottom-hole zone of the reservoir wells, including connected to the cable head air chamber with the atmospheric pressure, the diaphragm and the intake chamber in the cavity where flammable solid composite material consisting of two parts (EN 2138630, CL E 21 In 43/25, 43/18, adopted as a prototype. The first part facing the air chamber formed of durable and malagasay allocation during the combustion of the composition having 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 holes. The case of the reception chamber made of solid light plastic elastic-plastic material that can deteriorate the combustion placed in it a solid composite material.

The device operates as follows. The device is lowered on the cable-the cable connected to the cable head on the borehole bottom, and set the receiving chamber opposite the interval of the processed layer. From the wellhead through the cable serves an electrical impulse to the igniter second part of the combustible solid composite material - gas-generating composition. After ignition and layer-by-layer combustion gas-generating composition generates excess pressure. It also layers burns and the case of the reception chamber. The heated gases create in the field of processing interval increased pressure and penetrate into the pores of iresine of the reservoir, melting under them in paraffin and asphaltene deposits. The gas-generating composition at the end of the combustion ignites strong with malagasay allocation by the combustion of the composition, sealing air chamber. After the combustion of a solid with malagasay selection of the composition occurs depressurization air chamber, and it directs the flow of the well fluid. Due to the flow of fluid from the well to the air chamber in the bottom hole zone of the reservoir creates a sharp decrease in pressure (implosion). Pollution in the form of paraffin - and asfaltenovyh deposits, pre-molten, more fully taken out of the bottom-hole zone of the reservoir wells.

A disadvantage of the known device is the low efficiency of treatment of bottom-hole zone of the reservoir, due to the considerable thermal losses associated with heat, leaving the treatment area with gaseous products of combustion of gas-generating compositions. Another significant drawback is the low sensitivity to ignite the gas-generating composition, which reduces the reliability of the device and complicates its design.

Another drawback is the top location of the air chamber, which does not allow to extract from the well products clear and formation.

The technical task of the invention is to increase the efficiency of use of the device for processing bottom-hole zone of the reservoir wells.

The problem is solved as follows. A device for processing bottom-hole zone of the reservoir wells which are connected to the cable head, includes a receiving chamber with a charge of heat-resistant solid fuel, connected with it by an air chamber with the atmospheric pressure and the igniter. Receiving chamber perforated along the entire length of the holes for the expiration of the combustion products and is located above the air chamber. Reception and an air chamber separated combustible conical plug made of high-strength, heat-resistant, melanogenesis composition with low emission combustion. The charge adjacent to the upper end of chamber - end of burning, made of heat-resistant, malahitovaja, melanogenesis composition with high temperature products of combustion and a high calorific value, low dependence of the rate of combustion pressure and protected from burning on the cylindrical side surface composition, prevents burning on the surface, combustible, together with charge. The charge adjacent to the combustible stub - channel design, bystrousvoyaemye made of heat-resistant gasogene youseo composition, when the igniter is mounted in the upper end of the charge adjacent to the upper end of the receiving chamber.

Processing of the productive formation by means of the proposed device is performed in stages:

stage 1 - the heating of the layer by using a heat-resistant charge end of combustion from melanogenesis malahitovaja composition with high temperature products of combustion and a high calorific value;

stage 2 - deep warm layer by using mastrogiacomo heat-resistant charge channel design of the gas-generating composition;

stage 3 - combustion conical plugs, sealing air chamber and providing the necessary time for completion of the second phase;

stage 4 - implosive effect on the layer.

The drawing shows the proposed device.

The device is connected to a cable head 2 and includes a receiving chamber 4 charges 5, 7 of the heat-resistant solid fuel and connected with it by an air chamber 9 with atmospheric pressure. Receiving chamber 4 is separated from the air chamber 9 by means of a combustible conical stub 8, made of high-strength heat-resistant, melanogenesis composition with low emission combustion. Receiving chamber 4 are perforated along the entire length of the holes for the expiration of the combustion products and is you the e air chamber 9. Charge 5 adjacent to the upper end of chamber 4, face burning, made of heat-resistant malahitovaja melanogenesis composition with high temperature products of combustion and a high calorific value, low dependence of the rate of combustion pressure and protected from burning on the cylindrical side surface composition 6 which prevents burning on the surface, combustible, together with charge. At the top end of the battery 5 is mounted igniter 3. Charge 7 adjacent to combustible stub 8, channel design, bystrousvoyaemye made of heat-resistant gas-generating composition.

The device operates as follows.

The device is lowered on the cable-the cable connected to the cable head 2, on the bottom of a well and installing a receiving chamber 4 opposite the interval of the processed layer. From the wellhead through the cable serves an electrical impulse to the igniter 3 charge 5. Charge 5 is illuminated by parallel layers from top to bottom due to the fact that the side surface of the charge is protected from burning composition 6. At the same time to provide a more thorough warm-up of the bottomhole zone of the reservoir used malagasay solid composition with the highest calorie, high temperature products of combustion and low dependence of the rate of combustion pressure. Stood the charge 5 different small getpointatlength (250-300 DM ³/kg)to minimize the entrainment heat of the combustion gases leaving the treatment area. The burning rate of the charge 5 is selected the lowest, and the length of the charge 5 is the greatest to ensure a long time of its burning. During combustion of the charge is 5, the flame front moving down across the perforated interval, provides long-term high-temperature effects on the producing formation. The above getperiod creates in the treatment area excessive pressure, contributing to the heat transfer into the reservoir. The charge 7 is ignited by the combustion products of charge 5 at the end of the latter. The composition of the charge 7 in contrast to the composition of the battery 5 has a higher getpointatlength (900-1000 DM³/kg). Charge 7 has one or more cylindrical channels, and the side cylindrical surface in contrast to the charge 5 is not protected from burning. These features of the battery 7 can burn it in the shortest time measured in tenths to tenths of a second. Due to the brevity of the combustion charge 7 formed volume of gaseous products can not instantly leave the treatment area, and the pillar of the well fluid above the receiving cell, due to its inertia cannot immediately be set in motion and because of this some time, measured in seconds, performed the role of the packer. For these reasons, in the treatment zone is created excessive pressure, the value of which can be adjusted in a wide range by changing the weight of the battery 7. High overpressure gases with high temperature, acting on pre-heated work charge 5 reservoir, promotes deeper warmup remote from the casing of the productive zones of the reservoir and thereby prepare the reservoir for subsequent operations implosion. Gaseous products of combustion, expanding, result in the movement of the column of well fluid lifting it to a certain height. The pressure in the treatment area falls. Is the depression on the layer (absorption). The liquid column is returned to its original position, compressing the gas. Is repression on the reservoir pressure). Thus, there attenuating vibrations of the column of well fluid, providing repression-depression effects on the producing formation, facilitating a deeper promotion of gaseous products, with the high temperature in the reservoir. So there is a deep heating of the productive formation Deep heating reduces the viscosity petroleum fluids, i.e. increases their mobility and repression-depression effect weakens their adhesive contact with the reservoir rock.

Tapered plug 8 d what's the camera 9 is ignited by the combustion products of charge 7 at the end of the latter. The cap 8 is made of high-strength, heat-resistant, melanogenesis composition with low emission combustion. These characteristics ensure the operational reliability of the plugs 8 in the conditions of high temperatures and high pressures. Low burning rate of the composition of the stub 8 provides a time delay during which the gaseous products of combustion of the charge 7 leave the treatment area to avoid filling the air chamber gaseous products of charge 7 at the time of depressurization of the combustion of the stub 8. Small getpointatlength composition stub 8 eliminates the possibility of filling the gaseous products resulting from the combustion air chamber 9 and thereby reduce the effect implosion. After combustion of the stub 8 rethermalized air chamber 9 with a pressure of 0.1 MPa, creating a depression on the layer. Petroleum fluids, become mobile as a result of thorough warm-up is extracted from the reservoir, filling the air chamber 9. At the same time from the reservoir removes solid colmatage particles.

The novelty of the proposed device for processing bottom-hole zone of the reservoir wells is:

- the design of the charges and their capability to provide the mode of operation of the device for the gradual heating of the reservoir;

in design C is gluski air chamber, to ensure its performance in conditions of high pressures and high temperatures and the nature of its combustion, allowing to obtain the required time delay to complete the process of heating and removing gaseous products from the area of the well treatment;

in the location of the air chamber below the inlet chamber, which allows the most complete extract from the well contamination;

- the design of the device, allowing to provide in sequence a gradual impact on the reservoir - deep warming, repression-depression effect and the implosion.

1. A device for processing bottom-hole zone of the reservoir wells, including receiving chamber of a solid propellant charge and an igniter, a combustible filler and air chamber with atmospheric pressure, characterized in that the receiving chamber are perforated along the entire length of the holes for the expiration of the combustion products, the charge adjacent to the upper end of the inlet chamber, face burning, made of heat-resistant malahitovaja, melanogenesis composition with high temperature products of combustion and calorific value, with a small dependence of the rate of combustion pressure and protected from burning on the side surface of the composition which prevents burning on the surface, combustible owls the local charge the charge adjacent to the plug - channel design, bystrousvoyaemye made of heat-resistant gas-generating composition, and the igniter is mounted in the upper end of the charge adjacent to the upper end of the inlet chamber and the air chamber with the atmospheric pressure is lower than the reception chamber.

2. The device under item 1, characterized in that the combustible plug is made conical and made of high-strength heat-resistant melanogenesis composition with low emission combustion.