Method of water-producing well recovery

FIELD: oil and gas industry.

SUBSTANCE: according to the method in a watered part of a formation at first remedial cementing is made to cut the inflow of stratal water off and to isolate the watered part of the formation by a cement plug setting. A geophysical survey is performed in the non-watered part of the formation. Intervals are identified with bigger permeability of the productive formation areas. An assembly with an end-to-end channel is run in at the drill string and set by means of an anchor packer device. It is oriented towards one of the permeable areas of the productive formation. Mill equipment with a downhole drilling motor, flexible shaft and cutter is run in to the well at a flexible tube. An opening is cut in the production string wall with the use of an oil-based solution. The mill equipment is run out from the well. A jet nozzle is run in to the well up to a discharge outlet of the guide assembly. Cement stone and rock is washed out behind the production string so that a radial borehole is formed. The radial borehole treatment is made through the jet nozzle by an acid composition so that a cavern is formed. The flexible pipe with the jet nozzle is lifted out of the well. The guide assembly is rotated, for example, per 180 degrees and similar operations are performed to tunnel the next radial borehole. The guide assembly is lifted to the height of the next interval in the permeable areas of the productive formation and the similar operations are performed to tunnel the next radial boreholes. Up to the upper radial boreholes of the well an oil string is run in and the above string is made of tubing strings with the area of a clearance hole equal to the sum of all the clearance holes in the radial boreholes. The well is brought to operation.

EFFECT: improved efficiency of the method due to the removal of conditions for swelling of clays contained in the productive formation at tunnelling the radial borehole in low-permeable terrigenous deposits of water-swelling clays.

3 ex, 6 dwg

 

The invention relates to the oil and gas industry, namely the restoration of flooded wells, particularly wells located in low-permeability terrigenous sediments composed of blagodaryaschih clay.

Collectors on the fields of the North of Western Siberia, which are production wells, are structurally complex reservoirs in the lower part of which is placed highly productive deposits, and in the upper - seal off low-permeability terrigenous sediments, composed of blagodaryaschih clay.

From the experience of repair of such wells it is known that with decreasing reservoir pressure in highly productive reservoir bottom water introduced, underlying this place, is the flooding of the reservoir and held in the bore of repair and insulation works to isolate the flow of formation waters is inconclusive autopsy upstream seal off low-permeability terrigenous sediments composed of blagodaryaschih clays, known methods, cumulative punching or drilling of a sidetrack with the use of aqueous solutions leads to swelling clays, preventing subsequent extraction of gas from the reservoir.

For recovery of flooded wells are repair and insulation works [Reference kN the ha on current and capital repair of oil and gas wells / A. D. Amirov and others - M.: Nedra, 1979. - S. 238-241].

There is a method of recovery wells, including the repair and insulation works and the opening of a productive layer [RF Patent №2273718, E21B 29/10 declared 02.07.04 published 10.04.06].

The disadvantage of this method is the lack of efficiency of recovery of flooded wells, as in the manufacture of repair and insulation works longitudinally-corrugated patch does not resolve the inflow of formation water into the well, and the probability of failure of the repair interval casing, especially in wells with the presence of a continuous perforated production string double density increases.

There is a method of recovery of flooded wells, including the repair and insulation works and the opening of a productive layer [RF Patent №2231630. E21B 43/00, E21B 43/32 declared 2002, published 2004].

The disadvantage of this method is the lack of efficiency of recovery of flooded wells, as by perforating the production casing punches a large capacity, the likelihood of leakage of the cement behind the casing increases, with full or partial destruction, contribute to the greater inflow of formation water to the borehole bottom.

There is a method of recovery wells, the adopted saprolite, including repair and insulation works and the opening of a productive layer [RF Patent №2370636. E21B 43/00, E21B 43/32 declared 21.04.08 published 20.10.09].

The disadvantage of this method is the lack of efficiency of recovery of flooded wells, as when used in the repair process of technological solutions for water-based leads to swelling clays contained in the reservoir.

The challenge when creating the invention is to improve the efficiency of recovery of flooded wells.

Achievable technical result, which is obtained by the invention, is to eliminate conditions of swelling clays contained in the reservoir when the gasket radial bore in tight terrigenous sediments composed of blagodaryaschih clay.

The task and the technical result is achieved by the fact that the restoration of flooded wells initially in obwodnica of the reservoir carry out repair and insulation works to isolate the flow of formation waters and cut off obwodnica part of the trunk setting a cement bridge, then the remaining non-irrigated part of the layer of conducting geophysical surveys, determine the interval of more permeable sections of the reservoir, after which the string of drill TRU is lowered and set using the anchor-patrullero device guide layout provided end-to-end channel, Orient it in the direction of one of the permeable sections of the reservoir, then well remove the string of drill pipe into the well on coiled tubing down milling tooling, consisting of the downhole motor and flexible shaft at the lower end of which carries a cutter, cut in the wall of the production string hole using a technological solution, hydrocarbon-based, extracted from the well on coiled tubing milling snap, attached to Shoe a flexible pipe through bill of sleeves of a high pressure jetting nozzle and lower it into the well to the outlet of the guide link, jets with a technological solution hydrocarbon-based high pressure wash cement stone for the production column and the subsequent movement of the jetting nozzle in the radial direction blur rock with the formation of the radial shaft, then through the jetting nozzle are cleaned radial trunk acid composition of a mixture of glyoxylate and organic acids, for example ascorbic, citric or formic, with the formation of extending radial barrel cavity, is then removed from the bore flexible pipe with high-pressure hose and hydroman the Torno nozzle, spend the rotation of the guide link in the same plane, for example, 180 degrees, permeable section of the productive formation and conduct similar operations work on laying next radial shaft, then pull the guide layout on the height of the next interval permeable areas of the productive formation and conduct similar operations on laying the subsequent radial shafts, then into the well to the upper radial trunks down Elevator column of tubing with a square bore holes, equal to the sum of the squares of the through-hole radial shafts, and wells put into operation.

In Fig.1 shows a scheme of repair and insulation works to isolate the flow of formation water and cut off obwodnica part of the trunk setting a cement bridge, Fig.2 is the same when running in the hole of the guide arrangement of Fig.3 is the same when cutting in a production string holes; Fig.4 - the same with the erosion of the cement behind the production casing and rocks surrounding the borehole, the fluid hydrocarbon-based education radial shaft, Fig.5 is the same when washing radial trunk acid composition with the formation of cavities, Fig.6 is the same when the input is restored wells in operation.

Way realize the SJ as follows.

During operation of the wells, located in a complex tectonic layer 1, the bottom, the most productive part 2 formation penetrated through the perforation of the casing 3 with the formation of the perforations 4 through which the gas.

With decreasing reservoir pressure of bottom water 5 is initially below the Shoe 6 production string, start to catch up to the perforation hole 4 through the cone bottom waters 7, Obvodny well.

To eliminate irrigation wells in place remedial cementing, pumping through the perforations 4 waterproofing composition 8 and securing her a cement formation in the inner cavity of the production string 3 cement bridge 9, overlying the perforations 4.

Followed by geophysical surveys, the results of which determine the interval of more permeable sections Yu low-permeability seal off part of the reservoir 1.

Next on the string of drill pipe 11 lower guide arrangement 12, provided with a through channel 13 made in her case. Place the guide arrangement 12 in the borehole so that the outlet 14 through channel 13 was located in the selected interval of one of the permeable part the Cove 10 low-permeability seal off part of the reservoir. Fix the guide arrangement 12 in the production string 3 in the selected position by anchor-pokerwise device 15.

Then well remove the string of drill pipe 11.

Then into the hole on the flexible tube 16 into the cavity through holes 13 to the outlet 14 of the lower milling tooling, consisting of the downhole motor 17 and the flexible shaft 18, on the lower end of which carries a cutter 19.

Using milling snap in the wall of the production string 3 cut hole 20 using technological solution hydrocarbon-based 21, for example, gas condensate, diesel fuel, crude oil.

Extract from a well on a flexible pipe 16 milling tooling. Attached to the Shoe flexible pipe 16 through bill of high-pressure hoses 22 jetting nozzle 23 and lower it into the well. Length of transferable high-pressure hose 22 is selected from a calculation of the maximum possible length of the radial shaft 24, projected in the selected interval of one of the permeable sections 10 low-permeability seal off part of the layer.

Jets of solution hydrocarbon-based 21, for example, gas condensate, diesel, fuel oil, under high pressure, do not exceed the fracture pressure, dilute cement Cam is ery 25 for operating the column 3 and the subsequent movement of the jetting nozzle 23 in the radial direction of the blur surrounding the borehole rock permeable section 10 low permeability of the reservoir with the formation of radial shaft 24 of small diameter, depending on the thickness of the selected interval of one of the permeable sections 10 low-permeability seal off part of the layer.

After graduation radial shaft 24 are radial clearance of the shaft 24 by washing it with acid composition 26 of a mixture of glyoxylate consisting of hydrochloric acid 10-12% concentration hydrofluoric acid 3-5% concentration, and organic acids, for example ascorbic acid 1-2% concentration, or citric acid 1-3% concentration, or formic acid 5-7% concentration, with education beyond the walls of the radial shaft 24 of the cavity 27 that extends radial shaft 24.

Then remove from the bore flexible pipe 16 with the high-pressure hose 22 and the jetting nozzle 23, conduct the rotation of the guide link 12 in the same plane, for example, 180 degrees, depending on the direction of the next stretch of the selected interval permeable sections 10 low-permeability seal off part of the reservoir and carry out similar operations on laying next radial trunk.

Next, raise the guide arrangement 12 on the height of the next selected interval permeable sections 10 low-permeability seal off part of the reservoir and carry out similar operations on the strip after the respective radial trunks.

After completion of repair works on restoration of flooded wells from it take jetting nozzle 23 and the guide arrangement 12 in the well to the depth of the upper radial shaft down Elevator column 28 of the tubing diameter corresponding square bore holes, equal to the sum of the squares of the through-hole radial trunks.

Next, the well is completed and put into operation.

Examples of implementation of the proposed method.

Example 1

Restoration of flooded wells with the production column with a diameter of 168 mm was performed in the following way. Originally in obwodnica of the reservoir has conducted remedial cementing operations to isolate the flow of formation water and cut off obwodnica part of the trunk setting a cement bridge. As water compositions used composition based on silicone fluids NGL-11N, polyvinyl alcohol PVA-VN with add as a thickener aluminosilicate microspheres, as well as cement - composition-based PTC 1-100 with the addition of superplasticizer SP-1. Then in the remaining non-irrigated part of the reservoir has conducted geophysical surveys and determined interval of more permeable sections of the productive formation. Then the string of drill pipes with a diameter of 89 mm SP the styles and installed using the anchor-patrullero device guide layout provided end-to-end channel, sorientiroval her in the direction selected in the interval 696-700 m of permeable area of the productive formation. As the anchor-patrullero device used packer PRO-YAMO 168×35 NPF "Packer" (, Oktyabrsky, Republic of Bashkortostan). Then from the well produced a string of drill pipe and into the well on coiled tubing with a diameter of 48 mm lowered milling tooling, consisting of the downhole motor type D1-54 and flexible shaft at the lower end of which was posted cutter FER-57. In the wall of the production string with a diameter of 168 mm cut a hole with a diameter of 60 mm with the use of gas condensate. Well drew on the coiled tubing milling tooling and attached to the Shoe flexible tube through bill of sleeves of a high pressure jetting nozzle, lowered it into the well to the outlet of the guide link. Jets of gas condensate under a pressure of 35 MPa has eroded cement stone for the production column. Subsequent movement of the jetting nozzle in the radial direction on the selected permeable section of the productive layer with thickness of 4 m has eroded rock with the formation of radial shaft diameter of 50 mm and a length of 100 m and then through the jetting nozzle spent clearing the radial trunk acid SOS is avom of a mixture of glyoxylate, containing hydrochloric acid and hydrofluoric acid, respectively, 12% and 5% concentrations, and ascorbic acid 1% concentration with the formation of extending radial trunk cavities with a diameter up to 80 mm, Then from wells drew a flexible tube with a high-pressure hose and a jet nozzle, spent the rotation of the guide link in the same plane 180 degrees and conducted similar operations on laying next radial shaft similar design. Then lifted the guide arrangement to a height of 30 m and has conducted similar operations in laying the following radial shafts. Then in the well to the upper radial trunks lowered lifting column with a diameter of 114 mm and the well was put into operation.

Example 2

Restoration of flooded wells with production casing diameter 146 mm was performed in the following way. Originally in obwodnica of the reservoir has conducted remedial cementing operations to isolate the flow of formation water and cut off obwodnica part of the trunk setting a cement bridge. As water compositions used composition based on silicone fluids NGL-10 and polyvinyl alcohol PVA-18/11, as well as cement - composition-based PTC 1-50 with the addition of superplasticizer C-3 and polipropileno fiber "Fiber is. Then in the remaining non-irrigated part of the reservoir has conducted geophysical surveys and determined interval of more permeable sections of the productive formation. Then the string of drill pipes with a diameter of 73 mm lowered and installed using the anchor-patrullero device guide arrangement, provided with a through channel, sorientiroval her in the direction selected in the interval 682-690 m of permeable area of the productive formation. As the anchor-patrullero device used packer G size 146 x 35 firm Giberson. Then from the well produced a string of drill pipe and into the well on coiled tubing with a diameter of 38 mm lowered milling tooling, consisting of the downhole motor type D1-48 and flexible shaft at the lower end of which was posted cutter type FER-52. In the wall of the production casing diameter 146 mm cut a hole diameter of 50 mm using diesel fuel. Well drew on the coiled tubing milling tooling and attached to the Shoe flexible tube through bill of sleeves of a high pressure jetting nozzle, lowered it into the well to the outlet of the guide link. Jets diesel fuel under a pressure of 35 MPa has eroded cement stone for the production column. Subsequent movement of the jetting Nashik is in the radial direction on the selected permeable section of the productive layer with a thickness of 2 m has eroded rock with the formation of radial shaft diameter 20 mm and length 50 m Then through the jetting nozzle spent clearing the radial trunk acid composition of a mixture of glyoxylate containing hydrochloric acid and hydrofluoric acid, respectively, 10% and 3% concentrations, and citric acid 3% concentration with the formation of extending radial trunk cavities with a diameter of 40 mm and Then from wells drew a flexible tube with a high-pressure hose and a jet nozzle, spent the rotation of the guide link in the same plane at 90 degrees and conducted similar operations on laying next radial shaft similar design. Then lifted the guide arrangement to a height of 50 m and has conducted similar operations in laying the following radial shafts. Then in the well to the upper radial trunks lowered lifting column with a diameter of 89 mm and the well was put into operation.

Example 3

Restoration of flooded wells with the production column with a diameter of 140 mm was performed in the following way. Originally in obwodnica of the reservoir has conducted remedial cementing operations to isolate the flow of formation water and cut off obwodnica part of the trunk setting a cement bridge. As water compositions used composition based on silicone fluids NGL-10 and hydrophobic additives ethyl silicate ETS-40,and as a cement - composition based on PTC 1-50 with the addition of superplasticizer C-3. Then in the remaining non-irrigated part of the reservoir has conducted geophysical surveys and determined interval of more permeable sections of the productive formation. Then the string of drill pipes with a diameter of 73 mm lowered and installed using the anchor-patrullero device guide arrangement, provided with a through channel, sorientiroval her in the direction selected in the interval 679-680 m of permeable area of the productive formation. As the anchor-patrullero device used packer PRO AG-0-140-35 SPC "Packer" (, Oktyabrsky, Republic of Bashkortostan). Then from the well produced a string of drill pipe and into the well on coiled tubing with a diameter of 33 mm lowered milling tooling, consisting of the downhole motor type D1-43 and the flexible shaft, the lower end of which was posted cutter type FER-47. In the wall of the production string with a diameter of 140 mm cut hole ø 45 mm with oil. Well drew on the coiled tubing milling tooling and attached to the Shoe flexible tube through bill of sleeves of a high pressure jetting nozzle, lowered it into the well to the outlet of the guide link. Jets of oil under a pressure of 35 MPa has eroded cement stone for exploitation the th column. Subsequent movement of the jetting nozzle in the radial direction on the selected permeable section of the productive layer with a thickness of 1 m has eroded rock with the formation of radial shaft diameter 10 mm and length of 25 m and then through the jetting nozzle spent clearing the radial trunk acid composition of a mixture of glyoxylate containing hydrochloric acid and hydrofluoric acid, respectively, 10% and 4% concentrations, and formic acid 7% concentration with the formation of extending radial trunk cavities with a diameter up to 20 mm, Then from wells drew a flexible tube with a high-pressure hose and a jet nozzle, spent the rotation of the guide link in the same plane at 45 degrees and conducted similar operations on laying next radial shaft similar design. Then lifted the guide arrangement to a height of 60 m and has conducted similar operations in laying the following radial shafts. Then in the well to the upper radial trunks lowered lifting column with a diameter of 73 mm and the well was put into operation.

Feature of the proposed method of recovery of flooded wells by means of a spacer radial shafts is that it is done in hard-built reservoir with multiple permeable sections of Discotronic the th seal off part of the reservoir, including, composed of low-permeability seal off much of the terrigenous sediments of small thickness, including ulaanburaa clay, and strip each radial stem carried out using a liquid hydrocarbon-based, not having a harmful effect, in particular, do not result in a moisture-containing swelling clays, and the radial clearance of the trunk from the remnants of rock and the radial expansion of the barrel are made using acid composition of a mixture of glyoxylate and organic acids, for example ascorbic, citric or formic, well-destructive cemented component of low-permeability Sandstone reservoirs. Thereby the increase in the effective area and the depth of drilling a small thickness when Troubleshooting conditions of swelling clays contained in the header.

Method of recovering water-cut wells in which obwodnica part of the layer is carried out initially repair of insulation to isolate the flow of formation water and cut off obwodnica part of the trunk setting a cement bridge, then the remaining non-irrigated part of the layer of conducting geophysical surveys, determine the interval of more permeable sections of the reservoir, after which the column beriln the x pipe down and set using the anchor-patrullero device guide layout provided end-to-end channel, Orient it in the direction of one of the permeable sections of the reservoir, then well remove the string of drill pipe into the well on coiled tubing down milling tooling, consisting of the downhole motor and flexible shaft at the lower end of which carries a cutter, cut in the wall of the production string hole using a technological solution, hydrocarbon-based, extracted from the well on coiled tubing milling snap, attached to Shoe a flexible pipe through bill of sleeves of a high pressure jetting nozzle and lower it into the well to the outlet of the guide link, jets technological solution hydrocarbon-based high pressure wash cement stone for the production column and the subsequent movement of the jetting nozzle in the radial direction blur rock with the formation of the radial shaft, then through the jetting nozzle are cleaned radial trunk acid composition of a mixture of glyoxylate and organic acids, for example ascorbic, citric or formic, with the formation of extending radial barrel cavity, is then removed from the bore flexible pipe with high-pressure hose and geromont the nuclear biological chemical (NBC nozzle, spend the rotation of the guide link in the same plane, for example, 180 degrees, permeable section of the productive formation and conduct similar operations work on laying next radial shaft, then pull the guide layout on the height of the next interval permeable areas of the productive formation and conduct similar operations on laying the subsequent radial shafts, then into the well to the upper radial trunks down Elevator column of tubing with a square bore holes, equal to the sum of the squares of the through-hole radial shafts, and wells put into operation.



 

Same patents:

FIELD: oil and gas industry.

SUBSTANCE: according to the method a removable whipstock is installed. Then a window is cut in boring case. An offshoot is drilled from the main borehole. Offshoot drilling is made with running in of the boring case, its continuous cementing, perforation and provision of required reliability of attachment in the area of offshoot tracking. At that behind-the-casing flows of gas and liquid mixture are excluded. To this end upon window cutting a cement ring is cut in the boring casing and adjoining soil is cut as well in direction of offshoot drilling forming a cavern with diameter exceeding diameter of the offshoot. The cavern is poured with solid sealing compound and offshoot is drilled through the cavern. Downhole pumping equipment is placed in the main borehole and oil is extracted from the main borehole and offshoot.

EFFECT: increased oil extraction from offshoot at operated main borehole.

3 cl, 2 dwg

FIELD: oil and gas industry.

SUBSTANCE: invention refers to the oil and gas industry and can be used in particular to prolong anhydrous operation conditions of oil producers. The substance of the invention: a device comprises a pipe string lowered into a well, a packer with a sealing member and a flow shutdown mounted therein; a hollow body comprises a pipe concentric with its axis. From above, this pipe is rigidly connected to the pipe string, and from below - to a piston. The pipe and piston are axially movable in relation to the hollow body from the flow shutdown. The hollow body from the flow shutdown is blind off from below; its holes are inclined at 120° to each other in three vertical planes along the perimeter of the hollow body. The first vertical plane comprises two holes above and below the sealing element of the packer, respectively. One hole is formed in the second vertical plane below the sealing element of the packer. The third vertical plane has one hole above the sealing element of the packer. The piston has a slot configured to provide an alternative connection of the holes of the vertical planes to the pipe inside when the pipe string and piston move axially and rotate about the hollow body of the flow shutdown. The hollow body of the flow shutdown is provided with an outer long slot inside from below, while the piston at the bottom has three inner long grooves inclined at 120° to each other along the perimeter; the outer long slot of the hollow body of the flow shutdown can be fixed in any of the three inner long grooves of the piston.

EFFECT: simplifying the operational structure of the device, improving its reliability and enhancing the same.

3 dwg

FIELD: oil and gas industry.

SUBSTANCE: invention refers to chemical and thermal treatment of a bottom-hole formation zone in developing high-viscosity oil deposits. A hollow cylinder rod is connected to a line of hollow pumping rods. A unit has also a working substance supply unit. This unit is stationary and isolated from a well production gathering line. An inside below an intake screen of the pump, between the cylinder wall and the surface of the hollow rod is divided into two sections. The cylinder rod is common for both sections and extends through a cylinder rod packing. The packing is provided between the sections. The bottom of the cylinder is connected to a tail piece with outlet holes. The tail piece comprises a hollow discharge rod. It is connected to the hollow rod of the pump. A non-return spring-loaded valve is arranged on the outlet of the hollow discharge rod of the pump.

EFFECT: unit comprises the differential sucker-rod pump, a cylinder of which is connected to a flow column; it ensures more reliable operation of the bore-hole sucker-rod pump unit and reducing serviceability.

1 dwg

FIELD: oil-and-gas industry.

SUBSTANCE: invention relates to recovery of said well located at multihorizon field. Proposed process comprises injection of isolating composition via well tubing string and fitting of "liquid" packer below tubing string shoe. Then, flow tubing above "liquid" packer is filled with killing fluid. Tubing string is withdrawn from the well. Deflector wedge is fitted inside tubing string. Lateral opening is cut in tubing string above overlaying high-pressure productive bed. Side hole is bored through said bed to extend through its entire depth to make side hole face occur nearby said high-pressure productive bed. Casing string with filter is lowered into bored side hole. Casing string is cemented above filter to the roof of top high-pressure productive bed and said wedge is withdrawn. Hanger with latch joint arranged at its inner surface is lowered on temporary string. Said hanger is fitted inside flow string under side opening. Oil string provided with side opening is lowered into flow string till interaction with latch device so that side openings of both strings are located opposite each other. Then, influx from lateral hole is initiated to remove killing fluid from the well. Then, liner with centring funnel at its shoe and packer hanger at its top is lowered on flexible pipe inside oil string to "liquid" packer. Solvent is injected via said liner. Said solvent destructs said "liquid" packer its residues falling on the face. Now liner is lowered to bottom holes of perforation interval of the bottom low-pressure productive bed. Liner is suspended in oil string above side opening of oil string. Flexible pipe is withdrawn from the well to place the well in operation.

EFFECT: efficient recovery.

7 dwg

FIELD: transport.

SUBSTANCE: method for installation of rapid-moving eduction column includes passing the rapid-moving column into a well, engagement of key for interaction with occlusion with nipple occlusion, extending interacting with profile key on rapid-moving column to interact with corresponding stopping profile in well shaft wall and thus supporting the rapid-moving column. In this method, interaction of the key with nipple occlusion causes extending the key interacting with profile into engagement with stopping profile.

EFFECT: higher reliability of holding the rapid-moving column while keeping relatively large flow diameter of the column.

29 cl, 8 dwg

FIELD: oil and gas industry.

SUBSTANCE: method involves dilution of salt rock with fresh or subsaline water by cyclic action on the formation, each of which includes pumping of a working agent to the saline oil formation through a well, closure of the well for the time of salt rock dilution, extraction of liquid from the formation through the same well. Cycles of action on the deposit are repeated till full coverage of the saline formation by action before opening of oil deposits contained in it and production of all the extracted oil deposits. Water pumping to the formation is performed at maximum possible constant bottom-hole pressure till reduction of the well water intake capacity by 2-8 times in comparison to its value at the pumping beginning, and extraction of liquid from the formation is performed at minimum possible constant bottom-hole pressure before the liquid with volume of at least 1.1-1.5 volumes of the fresh or subsaline water pumped to the formation earlier is removed to the surface.

EFFECT: increasing permeability of a saline formation throughout the area of its propagation, increasing productivity of production wells, increasing the coverage of the formation by action, volume of the removed oil deposits and acceleration of development rates.

4 cl, 1 tbl

FIELD: oil and gas industry.

SUBSTANCE: invention relates to submersible pumping units for operation of wells, where it is necessary to increase the differential pressure drawdown, without deepening of submersible pumping unit, and/or with unsealed production casing. The unit for oil-well operation includes the tubing string, electric submersible cable, electric submersible pump, the hydroprotection and submersible electric motor of which are encapsulated in the pressure-tight housing, which is tightly closed on the housing of the input unit of the electric submersible pump, the liner consisting from the pipe string the top part of which through the bushing is tightly connected to the bottom part of the pressure-tight housing, and in the bottom part of the liner the branch pipe with external sealing elements is located. The unit contains at least one packer with internal through passage channel with the diameter allowing to pass through the packer the tool, equipment and instruments, without extracting the packer. The sealing unit for the tight connection with the branch pipe of the liner is located either in the packer housing, or in the device below or above the packer.

EFFECT: improvement of performance of recovery of formation fluid from the wells.

1 dwg

FIELD: oil and gas industry.

SUBSTANCE: unit includes the wellhead equipment, concentrically located tubing strings of two diameters with electrocentrifugal and jet pumps in the production casing of the well. There is a separating camera located in the bottom part of the well bore under the centrifugal pump, equipped with the sealing housing. The unit has the channel for passing of the separated oil connecting the annular space above the pump with the separating camera, and inlet holes for entering the separated water. The sealing housing of the electric centrifugal pump from below in the interval of the separating camera is equipped with the inlet device made as the liner damped from below. The liner is divided into sections with the inlet holes. At the level of each inlet hole the liner is equipped with a glass used as a hydraulic lock for petroleum drips and inlet of water from the separating camera. The inlet holes are located in a single row along the liner and are made with the diameters diminishing in each subsequent section upwards. The gap between the housing and production casing of the well is used as a channel for passing of petroleum drips. The tubing string of the greater diameter in the wellhead equipment is connected to the water line, and tubing string with the smaller diameter - with the oil line. The bottom of the string with the smaller diameter is tightly installed in the upper cylindrical camera of the commutator installed in the tubing string with the greater diameter at the depth below the working level of fluid in the well. The commutator has vertical peripheral channels for passing through them of the upward flow of water and bottom cylindrical camera for placement of plug-in jet pump, the output of which is interconnected with the upper cylindrical camera. Meanwhile the possibility of supply of working fluid into the jet pump from the centrifugal pump, and pumped off fluid - along the side channel of the commutator from the annular space of the well through the check valve located from the external party of the commutator is provisioned.

EFFECT: downhole separation of oil from extracted product of the well and separate lifting of oil and water to the surface during inter-well pumping-over of water for maintaining of formation pressure.

2 cl, 3 dwg

FIELD: mining.

SUBSTANCE: as per proposed method, a pressure brine-carrying formation is developed by means of a well; high-mineralised geothermal brine is removed from it along a production casing string. After that, along an annular space between production and intermediate casing strings, which is interconnected via the wellhead with ground reservoirs and delivery equipment, as well as with an absorption zone formed before development of the brine-carrying formation at the interval of a geological cross-section of the well below the unit of a regional water-tight stratum. Brine is removed during opening, development and further operation of the formation to the absorption zone and the ground reservoirs with a possibility of using a hydraulic mineral potential of the brine from the reservoirs. Protection of the production string against deposition of hard formations on its walls from the produced brine during its movement from the formation to the well mouth is performed by temperature control of the upper part of the string at the interval of probable temperature phase transition due to continuous or periodic pumping along the brine flow in the string with a possibility of heat transfer to it of a heat carrier with initial temperature exceeding expected brine temperatures without any temperature control at the interval of probable temperature phase transition. According to the invention, heat carrier pumping is performed inside the brine lifted along the production string by arranging in the same string of a closed circulation circuit with the heat carrier in the form of service water. This circuit is made in the form of a coaxial heat exchanger drawn in the string to the depth that is not less than the value of phase transition interval. It consists of a heat-conducting vertical cylindrical housing coaxial to the string, closed in the base and provided from above with holes for water supply to the housing. Inside the housing there is a central pipeline with an open lower end that does not touch the base and an upper end opened for water discharge above the well mouth. With that, water is pumped first via an annular space of the heat exchanger, which is formed with the housing and the pipeline, in the direction opposite to the direction of brine lifting via the production string; then, it is supplied via the central pipeline to the heat exchanger outlet. Use of hydraulic mineral potential of the brine is performed with discharge of a less concentrated fluid formed at use together with discharged excess brine from the formation and reservoirs to the absorption zone. Before the fluid is supplied to a common discharge line, it is filtered from mechanical impurities.

EFFECT: enhanced method's efficiency.

5 cl, 3 dwg

FIELD: oil-and-gas industry.

SUBSTANCE: device comprises the string lowered in the well, packer with the flow shutoff device composed of hollow body with bores. Note here that the pipe arranged aligned with its axis and rigidly coupled tuning is provided with top and bottom lines of bores, shear pins and O-rings. Hollow body top end has centring skid. Shear pins are arranged above top line of bores while there above said pipe has thrust ring arranged at spacing equal to that between said top and bottom lines of bores. Hollow body top bores are located above the packer while bottom bores are arranged below the packer. At initial position, top and bottom bores of pipe and hollow body are intercommunicated to communicate above- and under-packer well space with pipe inner space. Pipe shear pins thrusts against the hollow body top end. To shut off product flow from under-packer space this pipe can displace axially relative to hollow body and communicate it with the pipe inner space via the top line of bores. To shut off produce flow from above-packer space this pipe can displace axially downward after destruction of shear pins unless thrust ring thrusts against hollow body top end and above-packer space communicates with pipe inner space via aligned bottom bores of hollow body and top bores of the pipe.

EFFECT: simplified design, unlimited changeover of product flows.

3 dwg

FIELD: oil extractive industry.

SUBSTANCE: method includes lowering a tail piece into well with temperature, electric conductivity and pressure sensors placed on tail piece along its length. Pressure sensors are used in amount no less than three and placed at fixed distances from each other. After that, continuously during whole duration of well operation between maintenance procedures, temperature, conductivity of well fluid, absolute value of face pressure and difference of pressures along depth of well in area of productive bed are recorded. Different combinations of pairs of pressure sensors are used for determining special and average values of well fluid density. When absolute pit-face pressure is lower then saturation pressure for well fluid by gas and/or when average values of density deviate from well fluid preset limits and/or when its conductivity deviates from preset limits, adjustment of well operation mode is performed.

EFFECT: higher efficiency, higher safety.

2 cl

FIELD: oil and gas extractive industry.

SUBSTANCE: method includes drilling of operation well, forming in productive bed within feeding range of operation bed of at least one level of main draining system by drilling horizontal shafts from operation well above productive bed, and driving said shafts in radial direction, also, to prevent fast watering of well, before start of its operation, hollows of horizontal shafts are isolated from operation well. In productive bed in feeding range of operation well on one level with main draining system additional draining system is formed, one additional level of main and/or additional draining systems is formed, hollows of operation well and horizontal shafts is additionally connected by hydraulic fracturing of bed, before isolation of hollow of operation well from hollow of horizontal shafts, filter is mounted in the latter, as well as porous oil-attracting hydro-repelling material.

EFFECT: higher efficiency and durability.

6 cl, 2 dwg, 1 ex

FIELD: oil and gas extractive industry.

SUBSTANCE: method includes measuring volume and denseness of fresh oil in reservoir in case of even or balanced temperature and pressure. Combined sample of fresh oil is taken from pipeline during its draining and denseness of oil and bed water and ballast content is determined. Then mass of drained oil is determined with consideration of measured parameters. Prior to draining, fresh oil from reservoir is exposed until partial separation of bed water, and its denseness is measured. During draining of fresh oil, its denseness,, volumetric share of water therein, pressure and temperature are determined. Drained oil mass and percentage of ballast is determined from given mathematical expressions. Denseness of exposed bed water is measured on basis of sample, taken after exposure of fresh oil in reservoir. Denseness of exposed bed water is measured in its flow during draining from reservoir after exposure and before draining fresh oil. Volume of fresh oil in reservoir is measured continuously by its level and data from graduating table for reservoir. Draining of combined sample of fresh oil from pipeline during its draining is performed manually or automatically in case of constant kinetic condition. After exposure of fresh oil in reservoir point samples of fresh oil are taken, additional combined sample is made thereof and denseness of fresh oil, oil and bed water and ballast percentage is determined from it, and these parameters are used when evaluating precision of determining parameters of drained oil. Measurements of denseness, volumetric water share, pressure and temperature during draining of fresh oil in flow are performed periodically with averaging of current values of measured parameters for time interval, equal to period of change of parameters of fresh oil in reservoir. Mass of bed water MW is determined from given formula.

EFFECT: higher precision.

8 cl, 1 dwg

FIELD: mining industry.

SUBSTANCE: method includes compressing gas at compressor station to required feed pressure, and utilization of drop liquid, containing drops of compressor oil and gas, before gas-distributing substation with following pumping of gas into well. Utilization of drop liquid is performed via slanted cylindrical separator of centrifugal type and deep chemical cleaning block in form of two parallel-placed absorbers, operating alternately with replacement of processed absorbents. Separator and two absorbers are mounted at tank for collecting compressor oil.

EFFECT: higher efficiency.

2 dwg, 1 tbl

FIELD: oil and gas extractive industry.

SUBSTANCE: method includes transporting hydrocarbon product along operation channel. Control of pressure changes along this channel is performed. If such change is present such debit of hydrocarbon product is set, which provides for destruction or decomposition of present natural gas hydrates and/or prevention of their forming. With this debit, to place of hydrates decomposition and/or prevention of their forming, alkali solution is fed with concentration 0.04-4.9% with "pH" greater than 10. Alkali solution is fed during time not less than time of pressure change along operation channel, as well as with flow and during time until achieving mass concentration of alkali in gas phase 10-15% of mass.

EFFECT: higher efficiency.

12 cl, 1 dwg

FIELD: oil and gas extractive industry.

SUBSTANCE: method includes full raising of cement in behind-pipe space up to mouth, sectioning wells by electro-isolating compounds from oil transporting system or bed pressure support system and use of cathode protection plant as cathode protection station with current controller. For each well time needed for completing cathode polarization of well is determined as well as time for well depolarization, during which potentials on well of cluster are lowered to minimal protective values. On each cluster well cyclic mode of cathode protection plant is performed: cathode polarization during completion of cathode well polarization and well depolarization during lowering potential on well to minimal protective values. During depolarization of one well cathode polarization of other cluster well is performed.

EFFECT: higher effectiveness.

1 ex

FIELD: oil and gas extractive industry.

SUBSTANCE: device has axial transmission and soft stripe support system. Axis connects electric engine to reducer and connected reducer and leading hub, by means of which transmission lines are actuated. After connection of driven hub and device for supporting pump bars, pump bar for actuating well oil pump can be connected. Leading hub can actuate transmission lines, including one connected to balancer, operating synchronously to operation of well oil pump in both directions. Also, device has base, corbel and platform, controller for controlling oil extraction process, transformer, frequency setting transformer, absolute values encoding means and braking tank. Said electric engine, reducer and leading and driven hubs are mounted on the platform. Controller, through setting frequency generator, functioning as main drive, is connected to electric engine. Controller is connected to encoding absolute values means, capable of displaying working conditions and receiving data about position and rotation angle of leading hub. Encoding means for absolute values and braking block compose a portion of device for determining movement and braking. Controller can contain central processing module, input/output module and liquid-crystal display. Controller can be connected to encoding extension means, immediately receiving data about angle, position and rotation speed of electric engine axis.

EFFECT: higher efficiency.

3 cl, 12 dwg, 1 ex

FIELD: oil-producing industry.

SUBSTANCE: the invention presents a method of purification of the underground potable water at a crude production. The method provides for limitation of traffic of pollutions by construction of boreholes and pumping in of solutions of reagents. Along the contour of the site of possible pollution they make a net of boreholes with the a controlled inter-pipe and drill string-borehole annulue space - a compound - boreholes, the distance between which and a number of steps is chosen depending on porosity and permeability of rocks. The steps of the compound-boreholes are placed perpendicularly to the traffic route of the natural stream of the underground potable water, and a pumping in of the solutions of reagents is made through annulue space and inter-pipe space of compounds - holes simultaneously with a crude and a gas production from a pay. The technical result is a reliable provision of purification of underground potable water at simultaneous production of a crude and a gas.

EFFECT: the invention ensures a reliable provision of purification of underground potable water at simultaneous production of a crude and a gas.

1 dwg

FIELD: gas extractive industry.

SUBSTANCE: method includes extraction of resource by mechanical drilling and extraction of slurry and rock pieces through well. Gas extraction is performed by horizontal drilling with washing and back expansion, with concurrent cleaning and separation of fresh extracted mixture and accumulation of gas. Delivery of expander of ultra-large working size to expansion place is performed through well subjected for backward expansion. Pressure, temperature and composition of washing liquid is adjusted in such a way, that free natural gas, freed during mechanical drilling, was dissolved in drilling mud and separated from it only after passing of separator through rotating preventer. Expander in form of rocker with cutters is used, expanding well diameter up to ten meters and more.

EFFECT: higher efficiency.

2 cl, 1 ex

FIELD: oil and gas industry.

SUBSTANCE: method includes insertion of compound of foam-forming and gas-forming substances, dissolving these in bed water, and forming of gas and foam and replacement of well liquid with foam, while as foam-forming substance sulphonole is used with sulphamine acid as reaction initiator. Liquid is extracted in two stages: at first stage upper portion of liquid column is piston-effected, at second stage water-soluble foam-forming substance is injected into well with foam stabilizer and reaction initiator, as well as gas-forming substance, while water-soluble foam-forming and gas-forming substances are inserted into well directly after piston-effecting, and water-soluble foam-forming substance additionally has surfactants. Mass of foam-forming substance is determined from conditions: Mff=(0.005-0.01)KMw, where K - component coefficient, Mw - mass of water removed from the well. As gas-forming substance, ammonium carbonate is used in amount 40-50 kg for 100 linear meters of water column in a well. Piston-effecting is performed with productiveness in no less than two times greater than well debit.

EFFECT: higher efficiency.

4 cl, 1 ex, 2 dwg

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