Method and system for oil production

Abstract

FIELD: oil production.SUBSTANCE: invention relates to a method and system for oil production. The extracted product is fed into the oil collection manifold. Reservoir pressure is maintained using injection wells. Water is pumped into the ejector nozzle. After measuring the flow rates of production wells, the associated petroleum gas is separated from the produced water-oil-gas mixture and pumped out using an ejector with the possibility of implementing wave modes of operation of oil production wells. The water-gas mixture is dispersed and the pressure is increased, followed by pumping the water-gas mixture into one or several injection wells and further into the formation using a booster pump. Reagents are dosed. Associated petroleum gas is separated from the water-oil-gas mixture together with pumping of the products of oil producing wells into an oil collection manifold using a frequency-controlled booster pump. The pressure is reduced at the mouth of oil production wells and in the annular space of oil pumping production wells, increasing the flow rate of oil production wells and increasing the flow rate of gas fed to the ejector intake. Wave modes of operation of oil production wells are implemented by means of joint frequency regulation of booster, charge and submersible well pumps.EFFECT: increase in the efficiency of oil production. The method includes the operation of oil production wells and measuring their flow rates.6 cl, 3 dwg

Description

[0001] This group of inventions relates to the oil industry. The inventions can be used in oil production to enhance oil recovery and increase well flow rates using water-gas stimulation.

[0002] A method for producing oil is known, which includes injecting water into an ejector nozzle, reducing annular pressures by pumping associated petroleum gas from the annular spaces of producing oil wells in a well cluster with an ejector, pumping a water-gas mixture created by the ejector into an injection well, and a device for implementing the same, comprising an injection well and an oil production well, a water supply line, a line for pumping gas from the annular spaces, as well as an ejector and a line for pumping the water-gas mixture [1]. The known method and device have low functional capabilities and a limited scope of application due to the impossibility of creating high pressures for pumping the water-gas mixture with the ejector.

[0003] Also known is a method of producing oil, which includes pumping water with a power pump, pumping associated petroleum gas from the annular spaces of oil wells with an ejector and reducing the pressure in the annular spaces, creating, dispersing and increasing the pressure of a water-gas mixture with subsequent pumping of the water-gas mixture into the formation with a booster pump, and a device for implementing it, containing a power pump, an ejector, a booster pump, a reagent dosing unit, as well as a water injection line, a line for pumping gas from the annular spaces of oil wells and a line for pumping a water-gas mixture into the formation, wherein the water injection line is in communication with the ejector nozzle, the line for pumping gas from the annular spaces of oil wells is in communication with the receiving chamber of the ejector, the ejector outlet is connected to the booster pump inlet, and the booster pump outlet is in communication with the line for pumping the water-gas mixture into the formation [2].The existing method and device are ineffective due to the insufficient flow rate of associated petroleum gas from the annulus of oil wells, which is used to create a water-gas mixture, to enhance oil recovery. Furthermore, the existing method and device do not provide for the implementation of non-stationary wave operating modes that contribute to enhanced oil recovery.

[0004] Furthermore, a method for producing oil is known, including cluster pumping operation of oil producing wells and maintaining reservoir pressure using injection wells, injecting water into an ejector nozzle, pumping associated petroleum gas from the annular spaces of oil producing wells with an ejector, increasing the flow rate of gas directed to water-gas action, alternately decreasing and increasing the pressure in the annular spaces, creating, dispersing and increasing the pressure of a water-gas mixture with subsequent injection of a water-gas mixture into the formation with a booster pump, as well as dosing reagents, and an oil production device containing a cluster including at least one oil producing well equipped with a submersible pump unit, and at least one injection well, an oil collection manifold, as well as a water injection line, an ejector, a line for pumping gas from the annular spaces of oil producing wells, a booster pump,a line for pumping a water-gas mixture into an injection well and further into the formation, as well as a reagent dosing unit, wherein the water injection line is connected to the ejector nozzle, the line for pumping gas from the annular spaces of producing oil wells is connected to the ejector receiving chamber, the ejector outlet is connected to the inlet of the booster pump, and the outlet of the booster pump is connected to the line for pumping a water-gas mixture into an injection well and further into the formation [3].,

[0005] The known method and device are characterized by low efficiency, high capital investments and operating costs, since in order to increase the gas flow rate, it is necessary to additionally feed nitrogen from a nitrogen compressor unit into the flow of the water-gas mixture injected into the formation, in addition to the associated petroleum gas from the annular spaces.

[0006] The closest in technical essence to the first object of the invention is a method for producing oil, including the operation of oil producing wells, measuring their flow rates, feeding the produced product into an oil collection manifold, maintaining reservoir pressure using injection wells, injecting water into the ejector nozzle, separating, after measuring the flow rates of the producing wells, associated petroleum gas from the produced water-oil-gas mixture and pumping it out with an ejector with the possibility of implementing wave modes of operation of oil producing wells, dispersing and increasing the pressure of the water-gas mixture with subsequent pumping of the water-gas mixture by a booster pump into one or several injection wells and further into the formation, as well as dosing of reagents [4].

[0007] The closest in technical essence to the second object of the invention is a system for producing oil, containing at least one oil production well and at least one injection well, a group metering unit, an oil collection manifold, as well as a water injection line, an ejector, a booster pump, a line for pumping a water-gas mixture into one or more injection wells and further into the formation, a reagent dosing unit, wherein the water injection line is communicated with the ejector nozzle, the ejector outlet is connected to the booster pump inlet, and the booster pump outlet is communicated with the line for pumping a water-gas mixture into one or more injection wells and further into the formation, while behind the group metering unit there is a gas separator with a water-oil-gas mixture supply line, a liquid outlet line and a gas outlet line connected to the ejector receiving chamber, wherein the booster pump is equipped with a frequency-controlled drive [4].

[0008] The said known method and system do not provide a significant reduction in pressure in the oil collection manifold and an increase in the consumption of associated petroleum gas directed to create a water-gas mixture, which does not allow for efficient oil production.

[0009] The technical problem that these solutions are aimed at solving is increasing the efficiency of oil production by increasing the flow rate of associated petroleum gas used to create a water-gas mixture, while reducing the pressure in the gas separator, pumping the separated liquid into the oil collection manifold, and increasing the flow rates of oil producing wells.

[0010] The said problem is solved in the first invention in that in the method of oil production, including the operation of oil producing wells, measuring their flow rates, feeding the produced product into an oil gathering manifold, maintaining reservoir pressure using injection wells, injecting water into the ejector nozzle, separating after measuring the flow rates of the producing wells the associated petroleum gas from the produced water-oil-gas mixture and pumping it out with an ejector with the possibility of implementing wave modes of operation of oil producing wells, dispersing and increasing the pressure of the water-gas mixture with subsequent pumping of the water-gas mixture by a booster pump into one or more injection wells and further into the formation, as well as dosing of reagents, according to the invention, the separation of the associated petroleum gas from the water-oil-gas mixture is carried out together with pumping out the products of the oil producing wells into the oil gathering manifold with a frequency-controlled booster pump,while reducing the pressure at the mouth of oil producing wells and in the annular space of oil pumping production wells, increasing the flow rates of oil producing wells and increasing the flow rate of gas directed to the ejector intake, and the implementation of wave modes of operation of oil producing wells is carried out by means of joint frequency regulation of the booster, booster and submersible well pumps.

[0011] In an embodiment of the method, the separation of associated petroleum gas from the water-oil-gas mixture is carried out using a centrifugal gas separator at the intake of a frequency-controlled booster multistage centrifugal pump.

[0012] The said problem is solved in the second invention in that in an oil production system comprising at least one oil production well and at least one injection well, a group metering unit, an oil collection manifold, as well as a water injection line, an ejector, a booster pump, a line for pumping a water-gas mixture into one or more injection wells and further into the formation, a reagent dosing unit, wherein the water injection line is in communication with the ejector nozzle, the ejector outlet is connected to the booster pump inlet, and the booster pump outlet is in communication with the line for pumping a water-gas mixture into one or more injection wells and further into the formation, while behind the group metering unit there is a gas separator with a water-oil-gas mixture supply line, a liquid outlet line and a gas outlet line connected to the ejector receiving chamber, wherein the booster pump is provided with a frequency-controlled drive, according to invention,a frequency-controlled booster pump is installed on the liquid outlet line of the gas separator in such a way that the liquid outlet line of the gas separator is connected to the inlet of the frequency-controlled booster pump, and the outlet of the frequency-controlled booster pump is connected to the oil gathering manifold, wherein the oil production wells are equipped with frequency control for flow and / or gas lift and / or pump operation, wherein the oil production pumping wells are equipped with annular valves designed with the possibility of alternately opening the annular space of the oil production pumping wells.

[0013] In preferred embodiments of the system:

[0014] • the gas separator is made centrifugal, the frequency-controlled booster pump is made multi-stage centrifugal, and the centrifugal gas separator is located at the inlet of the frequency-controlled multi-stage centrifugal pump, and the centrifugal gas separator and the multi-stage centrifugal pump are driven by a single electric motor with a frequency-controlled drive;

[0015] • The gas separator and multi-stage centrifugal pump are implemented in a horizontal design with a drive from a ground-based electric motor with a variable frequency drive;

[0016] • the gas separator and the multi-stage centrifugal pump are made in a submersible design with a drive from a submersible electric motor with a frequency-controlled drive, lowered on tubing pipes into a pit with an intermediate column and placed inside the intermediate column lowered into the pit, wherein the water-oil-gas mixture supply line is communicated with the upper part of the annular space formed between the walls of the intermediate pipe string and the pit, and the gas outlet line of the gas separator is communicated with the annular space formed between the walls of the intermediate pipe string and the multi-stage centrifugal pump, wherein the receiving chamber of the ejector is connected to the upper part of the annular space formed between the walls of the intermediate pipe string and the tubing pipes, on which the multi-stage centrifugal pump with a submersible electric motor is lowered.

[0017] The implementation of separation of associated petroleum gas from a water-oil-gas mixture by a centrifugal gas separator at the intake of a frequency-controlled multi-stage centrifugal pump allows for a significant increase in the degree of separation in the field of centrifugal forces together with the pumping of liquid by a booster pump with a significant reduction in wellhead pressures in oil producing wells.

[0018] The technical result achieved consists of increasing oil recovery by increasing the gas content of the water-gas mixture injected into the formation, as well as increasing the flow rates of oil producing wells by reducing wellhead pressures.

[0019] Fig. 1 shows a diagram of an oil production system, Fig. 2 shows a variant of implementing a system with a centrifugal gas separator and a multi-stage centrifugal pump in a horizontal design, Fig. 3 shows a variant of implementing a centrifugal gas separator and a multi-stage centrifugal pump in a submersible design.

[0020] The system comprises at least one oil producing well (in Fig. 1, a flowing oil producing well 1 and a pumping oil producing well 2 are shown as an example) and at least one injection well 3, a group metering unit 4, an oil gathering manifold 5, as well as a water injection line 6, an ejector 7, a booster pump 8, a line for pumping a water-gas mixture 9 into an injection well 3 (or into several injection wells) and further into a formation 10, a reagent dosing unit 11.The water injection line 6 is connected to the nozzle of the ejector 7, the outlet of the ejector 7 is connected to the inlet of the booster pump 8, and the outlet of the booster pump 8 is connected to the line for pumping the water-gas mixture 9 into one or more injection wells and then into the formation 10, while behind the group metering unit 4 there is a gas separator 12 with a line for supplying the water-oil-gas mixture 13, an outlet liquid line 14 and an outlet gas line 15 connected to the receiving chamber of the ejector 7, and the booster pump 8 is provided with a frequency-controlled drive 16. On the outlet liquid line 14 of the gas separator 12 there is a frequency-controlled booster pump 17 with a drive 18 such that the outlet liquid line 14 of the gas separator 12 is connected to the inlet 19 of the frequency-controlled booster pump 17, and the output 20 of the frequency-controlled booster pump 17 is connected to the oil collection manifold 5. The oil production wells are equipped with frequency control for fountain (1) and / or gas lift (in Fig.1 not shown) and / or pumping operation (2).

[0021] Flower well 1 is equipped with a tubing string 21 and a packer 22. A submersible borehole pump unit 23 is lowered into a production oil pumping well 2, drilled into formation 10, on tubing 24. The dynamic level in well 2 is designated by position 25, and the annulus by position 26. The submersible borehole pump unit 23 is provided with a variable frequency drive 27. Wells 1, 2 and 3 at the wellhead are equipped with pipe valves 28, 29, 30 and annular valves 31, 32, 33. In this case, oil production pumping wells 2 are equipped with annular valves 32, designed with the possibility of alternately opening the annular space 26 at the oil production pumping wells. Oil production wells 1 and 2 are equipped with discharge lines 34 and 35 connected to group metering unit 4, the output line 36 of which is connected to the line for feeding water-oil-gas mixture 13 to gas separator 12.The annular space 26 is connected to the discharge line 35 through the gate valve 32 and the check valve 37. The injection well 3 is equipped with a tubing string 38 and a packer 39. The reagent dosing unit 11 is connected to the water injection line 6 via a tube 40.

[0022] In the embodiment of the system, the gas separator 12 is made centrifugal, the frequency-controlled booster pump 17 is made multi-stage centrifugal, and the centrifugal gas separator 12 is located at the inlet 18 of the frequency-controlled multi-stage centrifugal pump 17, and the centrifugal gas separator 12 and the multi-stage centrifugal pump 17 are driven by a single electric motor with a frequency-controlled drive 18. Their design can be either horizontal or submersible.

[0023] In the embodiment of the invention (Fig. 2), when implemented in a horizontal design with a drive from a ground-based electric motor 41 with a frequency-controlled drive 42, the centrifugal gas separator is designated in the diagram by the number 43, the multi-stage centrifugal pump by the number 44, the outlet liquid line of the gas separator 43 by the number 45. The frequency-controlled multi-stage centrifugal pump 44 is installed in such a way that the outlet liquid line 45 of the gas separator 43 is connected to the inlet 46 of the pump 44, and its outlet 47 is communicated with the oil collection manifold 5.

[0024] In another embodiment of the invention (Fig. 3), when implemented in a submersible version with a drive from a submersible electric motor 48 with a frequency-controlled drive 49, the centrifugal gas separator is designated in the diagram by the position 50, the multi-stage centrifugal pump by the position 51, the liquid outlet line of the gas separator 50 by the position 52.The submersible electric motor 48, the centrifugal gas separator 50, the multi-stage centrifugal pump 51 are lowered on the tubing pipes 53 into the pit 54 with the intermediate column 55 and are placed inside the intermediate column 55 lowered into the pit 54, wherein the water-oil-gas mixture supply line 13 is connected to the upper part of the annular space 56 formed between the walls of the intermediate pipe string 55 and the pit 54, and the outlet gas line 57 of the gas separator 50 is connected to the annular space 58 formed between the walls of the intermediate pipe string 55 and the multi-stage centrifugal pump 51, wherein the receiving chamber of the ejector 7 is connected by line 59 to the upper part of the annular space 60 formed between the walls of the intermediate pipe string 55 and pump and compressor pipes 53, on which a multi-stage centrifugal pump 51 with a submersible electric motor 48 is lowered.The liquid outlet line 52 of the gas separator 50 is connected to the inlet 61 of the pump 51, and its outlet 62 is connected through the tubing 53 to the oil collection manifold 5.

[0025] The method of oil production is carried out as follows.

[0026] Water is pumped into the nozzle of the ejector 7, which is used to pump out associated petroleum gas from the gas separator 12 and the annular space 26 of the oil pumping production well 2, reducing the pressure in the annular space 26, and also creates, disperses and increases the pressure of the water-gas mixture with subsequent injection of the water-gas mixture into the formation 10 by the booster pump 9. Reagents (foaming agents, inhibitors, etc.) are also dosed by the unit 11.

[0027] The separation of associated petroleum gas from the water-oil-gas mixture in the gas separator 12 is carried out together with the pumping of the products of the oil producing wells 1 and 2 into the oil collecting manifold 5 by the frequency-controlled booster pump 17, thereby reducing the pressure at the mouth of the oil producing wells 1, 2 and in the annular space of the oil pumping production well 2, increasing the flow rates of the oil producing wells 1, 2, and increasing the flow rate of gas sent to the intake of the ejector 7.

[0028] The increase in the gas flow rate directed to the water-gas treatment and the gas content of the water-gas mixture is achieved by reducing the pressure in the gas separator 12 by pumping liquid by the frequency-controlled booster pump 17 into the oil-gathering manifold 5 while pumping the associated petroleum gas separated by the gas separator 12 on the surface from the water-oil-gas mixture produced by wells 1 and 2 by the ejector 7.

[0029] Separation of associated petroleum gas from a water-oil-gas mixture in embodiments of the invention is also carried out using a centrifugal gas separator 43 at the inlet of a frequency-controlled booster multistage centrifugal pump 44 in a horizontal design, or a centrifugal gas separator 50 at the inlet of a frequency-controlled booster multistage centrifugal pump 51 in a submersible design. This allows for significantly more efficient separation in a centrifugal force field compared to the gravity separation method.

[0030] Implementation of wave modes of operation of oil production wells 1 and 2 is carried out by means of joint frequency regulation of the booster 8, booster 17 and submersible well pump 23.

[0031] Frequency regulation of the booster pump 17 allows increasing and decreasing, in addition to the pressure in the gas separator 12 and the gas flow rate, the wellhead pressures in production wells 1 and 2, changing their flow rates.

[0032] The alternating decrease and increase in the pressure in the annulus 26 is achieved by alternatingly increasing and decreasing the flow rate of the water-oil-gas mixture pumped by the submersible pump unit 23 to the surface, due to the frequency control of the drive 27, together with the alternating increase and decrease in the pumping of associated petroleum gas by the ejector 7 from the annulus 26 of the producing oil pumping well 2 and / or the frequency control of the operation of the booster pump 8 using the drive 16. With an increase in the frequency, the values ​​of the flow rate and the developed pressure of the booster pump 8 increase, which leads to a decrease in the pressure at the outlet of the ejector 7 and an increase in its flow rate. Accordingly, with a decrease in the frequency, the values ​​of the flow rate and the developed pressure of the booster pump 8 decrease, as a result of which the pressure at the outlet of the ejector 7 increases and its flow rate decreases.To more effectively implement wave-driven transient operating modes, the annular valve alternately opens and closes the annulus of one oil production pumping well, then the annulus of another oil production pumping well in the cluster. Cycles of reducing and restoring wellhead, annular, and bottomhole pressures allow for increased flow rates from oil production wells.

[0033] The mining device works as follows.

[0034] Flower well 1, drilled into formation 10, operates due to the energy of the formation and associated petroleum gas released from the oil. The product extracted from flowing well 1 rises to the surface through tubing string 21 and then through pipe gate valve 28 enters line 34, and then into group metering unit 4. Submersible pump unit 23, operating oil producing well 2 drilled into formation 10, extracts product (water-oil-gas mixture) from it, delivers it to the surface through tubing 24 and then through pipe gate valve 29 of wellhead equipment along discharge line 35 into group metering unit 4. Associated petroleum gas, as a result of natural (or artificial, if submersible pump unit 23 is equipped with a gas separator) separation at the pump intake, enters annulus 26, goes above dynamic level 25, and through annular gate valve 32 and check valve 37 is directed into line 35 and group metering unit 4.

[0035] The product of producing oil wells 1 and 2, after group metering unit 4, enters its outlet line 36 and is directed via water-oil-gas mixture supply line 13 to gas separator 12, where liquid and gas are separated. Gas enters ejector 7 via line 15. Liquid enters booster pump 17 with variable-frequency drive 18 via line 14. Booster pump 17 pumps liquid out of gas separator 12, reducing the pressure in it. This, accordingly, reduces wellhead pressure in oil producing wells 1 and 2, increases their flow rates, and increases the consumption of gas separated by gas separator 12. Booster pump 17 pumps liquid through outlet 20 into oil gathering manifold 5.

[0036] Water is pumped through line 6 into the nozzle of the ejector 7. The reagent dosing unit 11 supplies foaming surfactants and inhibitors, if necessary, through tube 40 into line 6.

[0037] Ejector 7 pumps associated petroleum gas through outlet gas line 15 from gas separator 12, increases the pressure of the water-gas mixture with increased gas content, and disperses it. The water-gas mixture from the outlet of ejector 7 enters the inlet of booster pump 8, which pumps the mixture through line 9 through valve 30 and tubing 38 of well 3 into formation 10. The water-gas mixture with increased gas content in the range of rational gas content more effectively displaces oil from the formation. Packer 39 prevents the negative impact of high injection pressure on the production string of injection well 3.

[0038] The device also allows you to perform all the operations of the oil production method described above.

[0039] Alternating decrease and increase of pressure in the annulus 26 is carried out by alternating increase and decrease of the supply of water-oil-gas mixture pumped by the submersible pump unit 23 to the surface, due to frequency regulation by the drive 27. Also, at the same time, an alternating increase and decrease of the pumping of associated petroleum gas by the ejector 7 is carried out by frequency regulation of the operation of the booster pump 9 with the help of the drive 25, which leads to a change in the wellhead, annular and bottomhole pressures in oil producing wells 1 and 2.

[0040] To increase efficiency using a centrifugal force field, in embodiments of the invention, the gas separator is made centrifugal, the frequency-controlled booster pump is made multi-stage centrifugal, and the centrifugal gas separator is placed at the inlet of the frequency-controlled multi-stage centrifugal pump, and the centrifugal gas separator and the multi-stage centrifugal pump are driven by a single electric motor with a frequency-controlled drive.

[0041] In the embodiment of the invention, when implementing a gas separator 43 and a multi-stage centrifugal pump 44 in a horizontal design with a drive from a ground-based electric motor 41 with a frequency-controlled drive 42, the water-oil-gas mixture is directed along a line into the gas separator 43, where the separation of liquid and gas occurs. Gas along line 15 enters the intake of the ejector 7. Liquid along line 45 goes to the inlet 46 of the booster pump 44, which pumps liquid out of the gas separator 12, reducing the pressure in it, reducing the wellhead pressures in oil producing wells 1 and 2, which leads to an increase in their flow rates, as well as an increase in the consumption of gas separated by the gas separator 43. Booster pump 44 pumps liquid through outlet 47 into the oil gathering manifold 5.

[0042] In another embodiment of the invention (Fig. 2), when implementing a submersible version of the gas separator 50 and a multi-stage centrifugal pump 51 driven by a submersible electric motor 48 with a frequency-controlled drive 49, the water-oil-gas mixture is directed along line 13 into the upper part of the annulus 56 formed between the walls of the intermediate pipe string 55 and the pit 54, moves downwards, reaches the shoe of the intermediate pipe string 55, and then turns and goes upwards through the annular gap between the submersible electric motor 48 and the intermediate pipe string 55 into the gas separator 50. In it, separation of liquid and gas occurs.The gas enters the annular space 58 formed between the walls of the intermediate pipe string 55 and the multi-stage centrifugal pump 51 via the outlet gas line 57 of the gas separator 50, and then goes to the upper part of the annular space 60 formed between the walls of the intermediate pipe string 55 and the tubing 53, on which the multi-stage centrifugal pump 51 with the submersible electric motor 48 is lowered. Then, via line 59, the gas enters the intake of the ejector 7. The liquid after separation in the gas separator 50 goes via the outlet liquid line 52 of the gas separator 50 to the inlet 61 of the submersible multi-stage pump 51, which then pumps the liquid through the outlet 62 and the tubing 53 into the oil collection manifold 5.Ejector 7 pumps out gas, and a booster submersible multistage centrifugal pump pumps out liquid from gas separator 50, reducing the pressure in it and lowering wellhead pressures in oil producing wells 1 and 2, which leads to an increase in their flow rates, as well as an increase in the consumption of gas separated by gas separator 50 and then entering ejector 7. In it, gas and water are mixed, and the pressure of the water-gas mixture increases, which is then pumped by booster pump 8 into well 3 and further into formation 10.

[0043] Thus, the proposed technical solution makes it possible to increase the efficiency of the oil production process compared to known inventions, increase oil recovery and ensure higher flow rates.

[0044] Sources of information:

[0045] 1. Russian Federation Patent No. 2512150, IPC E21B 43 / 16, published 20.11.2013.

[0046] 2. Drozdov A.N., Drozdov N.A. Prospects for the development of well operation technology using jet pumps in Russia. - SPE 176676. -Russian Petroleum Technology Conference SPE, October 26-28, 2015, Moscow, Russia https: / / www.onepetro.org / conference-paper / SPE-176676-RU

[0047] 3. Russian Federation invention application No. 2017100954, IPC E21B 43 / 20, filed 12.01.2017, published 16.07.2018, Bulletin No. 20.

[0048] 4. Eurasian patent for invention No. 044576, IPC E21B 43 / 20, filed 18.12.2020, published 07.09.2023.

Claims

1. A method of oil production, including the operation of oil producing wells, measuring their flow rates, feeding the produced product into an oil gathering manifold, maintaining reservoir pressure using injection wells, injecting water into the ejector nozzle, separating, after measuring the flow rates of the producing wells, associated petroleum gas from the produced water-oil-gas mixture and pumping it out with an ejector with the possibility of implementing wave modes of operation of the oil producing wells, dispersing and increasing the pressure of the water-gas mixture with subsequent injection of the water-gas mixture by a booster pump into one or more injection wells and further into the formation, as well as dosing of reagents, characterized in that the separation of the associated petroleum gas from the water-oil-gas mixture is carried out together with pumping out the product of the oil producing wells into the oil gathering manifold using a frequency-controlled booster pump,while reducing the pressure at the mouth of oil producing wells and in the annular space of oil pumping production wells, increasing the flow rates of oil producing wells and increasing the flow rate of gas directed to the ejector intake, and the implementation of wave modes of operation of oil producing wells is carried out by means of joint frequency regulation of the booster, booster and submersible well pumps.

2. The method according to paragraph 1, characterized in that the separation of associated petroleum gas from the water-oil-gas mixture is carried out by a centrifugal gas separator at the intake of a frequency-controlled booster multistage centrifugal pump.

3. An oil production system comprising at least one oil production well and at least one injection well, a group metering unit, an oil collection manifold, as well as a water injection line, an ejector, a booster pump, a line for pumping a water-gas mixture into one or more injection wells and further into the formation, a reagent dosing unit, wherein the water injection line is in communication with the ejector nozzle, the ejector outlet is connected to the booster pump inlet, and the booster pump outlet is in communication with the line for pumping a water-gas mixture into one or more injection wells and further into the formation, wherein after the group metering unit there is a gas separator with a water-oil-gas mixture supply line, a liquid outlet line and a gas outlet line connected to the ejector receiving chamber, wherein the booster pump is equipped with a frequency-controlled drive, characterized in that a gas separator is installed on the liquid outlet line of the gas separator variable frequency booster pump thus,that the liquid outlet line of the gas separator is connected to the inlet of a frequency-controlled booster pump, and the outlet of the frequency-controlled booster pump is communicated with an oil-gathering manifold, wherein the oil production wells are equipped with frequency control for flowing and / or gas lift and / or pump operation, wherein the oil production pump wells are equipped with annular valves designed with the possibility of alternately opening the annular space of the oil production pump wells.

4. The system according to paragraph 3, characterized in that the gas separator is made centrifugal, the frequency-controlled booster pump is made multi-stage centrifugal, and the centrifugal gas separator is located at the inlet of the frequency-controlled multi-stage centrifugal pump, and the centrifugal gas separator and the multi-stage centrifugal pump are driven by a single electric motor with a frequency-controlled drive.

5. The system according to paragraph 4, characterized in that the gas separator and the multi-stage centrifugal pump are implemented in a horizontal design with a drive from a ground-based electric motor with a frequency-controlled drive.

6. The system according to paragraph 4, characterized in that the gas separator and the multi-stage centrifugal pump are made in a submersible design with a drive from a submersible electric motor with a frequency-controlled drive, are lowered on tubing into a pit with an intermediate string and are located inside the intermediate string lowered into the pit, wherein the supply line of the water-oil-gas mixture is communicated with the upper part of the annular space formed between the walls of the intermediate string of pipes and the pit, and the outlet gas line of the gas separator is communicated with the annular space formed between the walls of the intermediate string of pipes and the multi-stage centrifugal pump, wherein the receiving chamber of the ejector is connected to the upper part of the annular space formed between the walls of the intermediate string of pipes and the tubing, on which the multi-stage centrifugal pump with a submersible electric motor is lowered.

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