RU2756650C1 - Method for complex production of hydrocarbons from oil and gas condensate wells and a system for its implementation - Google Patents

Abstract

FIELD: mining industry.

SUBSTANCE: invention relates to technologies for the integrated development of hydrocarbon deposits using multifunctional horizontal wells. The expected result is achieved due to the fact that in the method for complex production of hydrocarbons from oil and gas condensate wells, including the installation of an operational column containing a perforation zone with a shank, the descent of a column of pumping and compressor pipes with operational equipment into the operational column and sealing the space between the pump and compressor pipe column and the operational column using two packers, one of which is installed below, and the other above the perforation zone of the operational column, further, at the first stage, oil is pumped out of the oil fringe of the reservoir through the shank of the production column horizontally installed in the oil fringe of the reservoir with the gas flow control valve closed, placed on the pump and compressor pipe column between the packers, feeding oil through a low-pressure plume to the oil treatment plant, at the second stage with an increase in the water content of the extracted products until the gushing stops or when the oil flow rate decreases to an economically viable limit, below which the well ceases to pay off operating costs, the shank is cut off and the gas is pumped out of the gas or gas condensate cap through the perforation zone in the production column with the gas inflow valve open, feeding gas through the first high-pressure plume to the integrated gas treatment plant (GTP).

EFFECT: ensuring the possibility of operating a multifunctional well at different stages sequentially as an oil well and then as a gas well, the possibility of producing oil with a high gas factor is provided.

7 cl, 2 dwg

Description

The invention relates to technologies for the integrated development of hydrocarbon deposits using multifunctional horizontal wells.

There are known methods for the production of various hydrocarbon components from one well (see, for example, patents RU No. 2018638, IPC E21B43 / 18, published on 08/30/1994; 2196882, IPC E21B43 / 00, published on 01/20/2003), during which they separate with a packer, the intervals of opening the gas cap and the oil-saturated part of the formation and at the same time carry out separate withdrawal of liquid from the oil-saturated part of the formation and gas from the gas cap.

The known methods are intended for simultaneous separate production of oil and gas and their implementation is possible only in cases of a clear boundary between the gas and oil hydrocarbon components.

There is a known method of pumping oil with a high gas-oil ratio (see patent RU No. 2627797, IPC E21B43 / 00, published on August 11, 2017), including drilling a sidetrack below the dynamic fluid level in the main wellbore, cementing the bottom of the main wellbore and running into equipment in such a way that a liner is lowered into the main bore below the side-bore tie-in, the deep pump is positioned above the side-bore tie-in point, the annular space of the well is connected to the upper part of the pressure tank and a discharge manifold located at the wellhead, and the lower part of the pressure container is connected to pump, the receiving part of which is in communication with the supply tank for the working fluid, and the pumping of the accumulating gas from the annular space is carried out periodically with the help of a pump turned on to supply the working fluid to the injection container with gas in the cycle of its pumping into the flow manifold, and disconnected to drain the working fluid from the delivery tank to the supply in the cycle of gas flow from the annular space into the injection tank.

The known method is one of the options for pressure gas lift and is focused on the production of the oil component, respectively, to the detriment of the gas component.

The closest to the proposed technical solution are a method of oil production with an increased gas content from wells and a device for its implementation (see patent RU No. 2667182, IPC E21B43 / 12, F04B47 / 02, published on September 17, 2018), taken as the closest analogs.

The method consists in lifting liquid with a sucker rod pump using associated gas from the annular space through the bypass valve into the cavity of the tubing, and a pump with a liner is used to lift the liquid from the well, the potential productivity of which is 25-30% higher than the inflow from the formation to the well , and after lifting fluid from the well without stopping the operation of the sucker rod pump, the well fluid is dosed through the multifunctional wellhead valve into the annular space from the oil gathering system for the time required to equalize the pressures in the annular space and in the oil gathering line, then the annular space with a gate valve installed on the wellhead valves are cut off from the oil gathering line, and the gas accumulated in the annular space is throttled through a gas bypass valve installed at the design depth.

A device for implementing this method contains a wellhead armature with a manifold, shut-off valves to control the operation of the well, a wellhead valve for bleeding gas from the annular space into the oil-gathering reservoir, downhole equipment, including a gas relief valve and a downhole rod installation lowered to the design depth on the tubing a pump with a filter, equipped with a tail pipe made up of tubing, and the gas bypass valve is made in the form of a compact cylindrical structure, with a wide central passageway, while the wellhead is equipped with a multifunctional wellhead valve with the ability to pass through itself a dosed volume of liquid from the oil gathering system into the well, and the downhole pump at the intake is equipped with a coupling with a nozzle placed in it for gas passage.

The known method and device provide the ability to output marginal wells with a high gas content for a long steady-state operation of the wells with minimal risks of disruption of the pump supply, jamming of the plunger in the pump cylinder. However, they are also designed for the simultaneous separate production of oil and gas, and the implementation with their help of production from one well at different stages of operation, first oil, then oil with a high GOR and then gas from the gas / gas condensate cap is impossible.

The technical problem solved by the claimed invention is to create a system that ensures the production of oil from an oil rim, as well as breakthrough gas and condensate from a gas or gas condensate cap, which, with an increase in water cut, can be transferred to the category of gas production wells.

The technical result achieved by the invention is to provide the possibility of operating a multifunctional well at different stages sequentially as an oil well and then as a gas one. In addition, the possibility of producing oil with a high gas-oil ratio is provided.

The technical result is achieved due to the fact that in the method of complex production of hydrocarbons from oil and gas condensate wells, including the installation of a production string containing a perforation zone with a liner, lowering the tubing string with production equipment into the production string and sealing the space between the tubing string and the production casing with the help of two packers, one of which is installed below and the other above the perforation zone of the production casing, then at the first stage oil is pumped out of the oil rim of the formation through the liner of the production casing horizontally installed in the oil rim of the formation with a closed gas inflow control valve located on the tubing string between the packers, supplying oil through a low pressure loop to the oil treatment unit, at the second stage with an increase in the water cut of the produced product until the flowing stops or when the oil flow rate decreases up to the economically viable limit, below which the well ceases to recoup operating costs, cut off the liner and pump gas out of the gas or gas condensate cap through the perforation zone in the production string with the gas inflow valve open, supplying gas through the first high-pressure loop to the integrated gas treatment unit (UKPG).

In addition, in case of gas breakthrough from a gas or gas condensate cap during oil pumping, at the first stage, it is possible to jointly pump oil from the oil rim and breakthrough gas through the production string liner with a closed gas flow control valve and supply of the resulting oil and gas mixture through a low pressure loop to the unit. oil treatment (OTP), and with an increase in the volume of associated and breakthrough gas above the maximum allowable for the oil treatment unit, switching the supply of the oil and gas mixture to the second high-pressure loop for separation, after which the separated oil is sent to the OTP, and gas - to the UTP.

In addition, the associated and / or breakthrough gas separated at the OTP can be compressed and sent to the OTP.

Also, the claimed technical result is achieved due to the fact that in the system for implementing the method of complex production of hydrocarbons from oil and gas condensate wells, containing a multifunctional well and a subsystem for collecting and preparing products of a multifunctional well, a multifunctional well includes a production casing string, a tubing string installed inside it, and the wellhead equipment installed in the upper part of both strings, the production casing string contains a perforation zone in the area of the gas or gas condensate cap, in the annulus between the tubing string and the production string there are two sealing packers, one below the production string perforation zone, and the second - above, while the tubing string contains a deep pressure and temperature sensor located between the packers and a gas flow control valve from the production casing, a collection subsystem and product preparation of a multifunctional well includes two high-pressure trains and one low-pressure train connected to the wellhead equipment through the choke and valves, the low-pressure train is connected to the oil treatment unit, the first high-pressure train is connected to the integrated gas treatment unit, and the second high-pressure train is connected to a two-stage separator, the gas outlet of the first stage of the separator is connected to the first high pressure loop, the gas and liquid outlet of the second stage of the separator is connected to the low pressure loop.

In addition, in the system for implementing the method for complex production of hydrocarbons from oil and gas condensate wells, the outlet of the oil treatment unit using associated petroleum gas can be connected to the inlet of the compressor unit, which is connected by its outlet to the complex gas treatment unit.

In addition, in the system for implementing the method for the integrated production of hydrocarbons from oil and gas condensate wells, the first high-pressure loop can be connected to the integrated gas treatment unit through a booster compressor station.

In addition, in the system for implementing the method for the integrated production of hydrocarbons from oil and gas condensate wells, a circulating sleeve can be installed in the tubing string above the packers.

In addition, in the system for implementing the method of complex production of hydrocarbons from oil and gas condensate wells, a shut-off valve can be installed in the tubing string below the packers.

In the claimed invention, a multifunctional horizontal well is used, drilled under a gas-oil contact (GOC) for the purpose of producing oil from an oil rim, as well as breakthrough gas and condensate from a gas or gas condensate cap and breakthrough gas, with an increase in water cut, transferred to the category of gas-producing vertical the trunk and opening the upper gas-saturated part.

The versatility of the well lies in changing its intended purpose at various stages of operation:

- depending on the thermodynamic processes occurring in the reservoir, the dynamics of water cut and the gas factor after the breakthrough of the cones of gas and / or water to the bottom, the rate of decrease in reservoir pressure, productivity;

- when the oil production rate decreases to the economically viable limit, below which the well ceases to recoup operating costs;

- with the cessation of gushing due to water breakthrough to the bottom;

- with an increase in the GOR and wellhead pressure due to gas breakthrough from the gas or gas condensate cap and the line pressure reaches the limit value at which trouble-free operation into the low-pressure network is possible;

- when the market conditions change and the expediency of a shift in emphasis from oil production to gas production and vice versa, etc.

The method for the integrated production of hydrocarbons (oil, gas and gas condensate) from a multifunctional well includes 3 main stages.

Stage 1. A multifunctional well is an oil well, a horizontal wellbore of which is located under the GOC and its main function at this stage of its life is to produce oil from the oil rim.

Stage 2.With a further increase in water cut and the achievement of the share of water in the production of a critical value, at which flowing is impossible, as well as with a decrease in oil flow rate to an economically viable limit, the well is transferred to the category of gas-producing vertical wells with the cut-off of the water-saturated horizontal wellbore and further operation of only the overlying gas-saturated interval of the gas or gas condensate cap.

Intermediate stage. With the breakthrough of gas from the gas or gas condensate cap to the wellbore during its operation at stage 1, accompanied by an increase in GOR and wellhead pressure, the well is transferred to the category of oil with a high GOR. Its main function at this stage is the production of oil from the oil rim, as well as breakthrough gas and condensate from the gas or gas condensate cap.

The claimed invention is illustrated by drawings, where Fig. 1 shows a conceptual diagram of a multifunctional well with downhole equipment; Fig. 2 is a diagram of a subsystem for collecting and preparing products of a multifunctional well.

The system for implementing the method of complex production of hydrocarbons from oil and gas condensate wells contains a multifunctional well and a subsystem for collecting and preparing the product of a multifunctional well.

The multifunctional well contains a production string 12 of casing pipes with a tubing string (tubing) 5 with an annular space 6 installed in it for lifting formation fluid with an annular space 6 and a wellhead connecting them with wellhead equipment 13.

The production string 12 serves to strengthen the well, isolate the productive horizons from the rest of the rocks and extract oil or gas from the well.

Wellhead equipment 13 includes a casing head 14 with a tubular head 15 mounted on it, on which tubing strings 5 with underground production equipment are suspended from below. The casing head 14 is welded to the surface casing and provides a flange connection between the surface casing and the BOP while drilling; internal configuration for installing a wedge hanger and insulation to hold and isolate the production string 12, outlets for the installation of valves controlling the annulus 6. The pipe head 15 is a double-flanged spool that fits over the casing head 14. It provides an internal configuration for installation of coupling suspension tubing 5, outlets for installing valves that control the annular space 6 between the production string 12 and tubing 5.

Tubing 5 is used to transport gas or liquid fluid from the well to the surface. To ensure tightness and reliability, tubing 5 is fastened with a threaded connection. The tubing string 5 contains the following main elements of underground production equipment, including: hydraulic packer 3, inflow control valve 9, downhole pressure and temperature sensor 7, hydraulic packer 11, hydraulic or electrical lines 2 of inflow control valves 9, circulation sleeve 4, plug or cut-off valve 10 for cutting off a flooded horizontal wellbore, liner 1.

The hydraulic packer 3 is designed to isolate the annular space between the liner head 1 and the production casing 12. The hydraulic packer 3 has a full bore inner diameter, which allows the work inside the liner 1 to be carried out without hindrance.

The hydraulic packer 11 seals the annulus above the gas-bearing formation and has ports (bypass passages) for passing through them the hydraulic or electrical lines of the inflow control valve 9. The elements of the packer 11 are slips that hold the packer 11 in the production string 12, and a rubber element that isolates the annular space 6. The hydraulic packer 11 is installed as part of the tubing string 5, lowered to the required depth and activated when a pressure difference between the tubular and annular space is created.

The inflow control valve 9 serves to regulate the gas flow from the gas-saturated part of the formation - the gas or gas condensate cap. The inflow control valve 9 has several open positions of various sizes and one fully closed position. Such a system makes it possible to flexibly, taking into account the well parameters changing over time, to regulate the gas lift process and stop it if necessary. Valve 9 can be controlled hydraulically or electrically from the surface through hydraulic or electric lines 2. To regulate the gas lift process, well killing and involvement of well workover crews and CT are not required. In the case of hydraulic control, the hydraulic lines come to the surface and are switched by creating a pressure difference between the lines, for which the Christmas tree is equipped with special outlets for connecting a pump. In the case of an electric inflow control valve 9, the gas flow into the tubing string 5 is regulated from the surface via an electric cable, which also transmits the bottomhole pressure and temperature readings from the downhole sensor 7. The adjustable electric inflow control valve 9 does not work according to the principle of changing the choke position, but according to share of opening of the flow area - needle valve.

The circulation sleeve 4 is a downhole device that is installed as part of the tubing 5 and provides communication between the tubing 5 and the annular space 6. The assembly is equipped with a circulation sleeve 4 in order to enable the well killing in the event of a workover, opening and closing the communication between the tubing 5 and the formation, carrying out acid treatments of the bottomhole zone (BHT), redirecting the flow from tubing 5 to annulus 6 or vice versa. To prevent hydrate formation, an inhibitor valve can be provided above the circulation sleeve 4 for supplying methanol solution through the annular space 6 through a separate line. To install the inhibitor valve, a special outlet for the tube for supplying methanol to the Christmas tree is provided.

A downhole sensor 7 for measuring pressure and temperature, installed above the inflow control valve 9, measures the pressure and temperature both in the tubing string 5 and in the annulus 6. A permanent downhole cable connects the downhole sensor 6 with a data recording and processing device on the surface, which records and processes data, and provides power supply to depth gauges.

Running a special plug on coiled tubing or installing a shut-off valve 10 as part of the assembly provides the ability to completely shut off the oil rim in the event of flooding and transfer the well to gas operation (isolation of the flooded oil rim).

The assembly of the multifunctional well provides for the running of liner 1, which is suspended from the previous string on a hanger without cementing.

The hydraulic / electrical lines 2 of the inflow control valve 9 provide the regulation of the gas flow from the gas or gas condensate cap into the tubing string 5, as well as the transmission of bottomhole pressure and temperature readings from the sensor 7.

The design of a multifunctional well provides for the possibility of both joining the gas-saturated interval of the gas or gas condensate cap using the inflow control valve 9 installed opposite, or above the interval of the gas or gas condensate cap during development for organizing a downhole compressorless gas lift, and cutting off the watered horizontal section of the well, or by lowering the plug with the help of a flexible continuous tubing (CT), or by installing an additional shut-off valve 10 with the achievement of the share of water in the production of a critical value, at which the flowing of the well is impossible.

The subsystem for collecting and preparing products of a multifunctional well includes, connected to the wellhead equipment 13 through valves 27, 26 and 29, a low pressure loop 17, a first high pressure loop 22 and a second high pressure loop 30. Low pressure loop 17 is connected to oil treatment unit 18 (OTP). The first high-pressure loop 22 is connected through a booster compressor station (BCS) 20 with a complex gas treatment unit 21 (GTP). The second high pressure loop 30 is connected to a two-stage separator with a first separation stage 23 and a second separation stage 25.

The loop 19 connects the outlet of the first gas separation stage 23 with the first high pressure loop 22. The outlet of the first stage 23 for liquid separation is connected by a loop 28 to the inlet of the second stage 25 of separation, which is connected by its outlet by a loop 16 to the OTP 18.

The gas outlet of the OTP 18 is connected to the OTP 21 through a compressor unit 24 for compressing associated petroleum gas.

The switching of the multifunctional well from the low pressure loop 17 to the high pressure loops 30 and 22 is carried out by opening and closing the valves 26, 27 and 29. The well is operated in the low pressure loop 17 in the case when the valves 26 and 29 are closed, and the valve 27 is open position. The well is operated in high pressure loop 30 when valve 26 is open and valves 27 and 29 are in the closed position. The well is operated in high pressure loop 22 when valve 29 is open and valves 26 and 27 are closed.

Oil treatment unit (OTP) 18 is a complex of equipment including pumps, settling tanks, separators, electric dehydrators, condensers, heat exchangers and other elements designed for dehydration, desalting and stabilization of oil before it is fed into the main oil pipeline.

Integrated gas treatment unit (CGTP) 21 is a set of technological equipment and auxiliary systems that ensure separation of droplet moisture, liquid hydrocarbons and mechanical impurities from gas. The commercial products of the UKPG 21 are: dry gas from gas fields, dry stripped gas from gas condensate fields, gas condensate. Gas field processing at GPP 21 consists of the following stages: absorption or adsorption drying; low temperature separation or absorption; oil absorption. In gas fields, gas preparation consists in drying it, therefore absorption or adsorption processes are used there. In gas condensate fields, drying and extraction of easily condensable hydrocarbons is carried out by means of low-temperature separation, low-temperature absorption or low-temperature oil absorption.

The choke 31 is a cylindrical disc or rod with a relatively small through hole. The hole diameter depends on the specified well operation mode and is selected empirically. To increase the service life, the fitting 31 is made of wear-resistant steel. The smaller the hole in the choke 31, the more resistance is created on the path of fluid movement, the higher the buffer pressure of the well and the lower, accordingly, its flow rate.

Low-pressure loops 16, 17 and high-pressure loops 30, 19 are pipelines designed for transporting formation mixture from a multipurpose well to OTP 18 and GPP 21. High pressure loop 22 is designed to collect and transport the product of a multifunctional well at the stage of its operation as a gas production wells.

A two-stage separator with a first separation stage 23 (high pressure) and a second separation stage 25 (low pressure) is required to separate well production and its further direction to the OTP 18 and the CGTP 21.

BCS 20 is designed to increase the pressure of the produced gas to the values required both at the inlet to the GPP 21 (to ensure the operating parameters of the gas preparation process). At the initial stage of field exploitation (usually 1-3 years), the booster compressor station is not part of the system. The booster compressor station is usually connected later when the reservoir pressure drops, followed by wellhead pressure and pressure in the gathering system.

Compressor unit 24 is designed for compression (compression) of associated petroleum gas and its subsequent transportation from OTP 18 to OTP 21.

The method of oil, gas and gas condensate production is carried out as follows.

Stage 1. Oil production from the oil rim of the oil and gas condensate reservoir

At the first stage of operation, a multifunctional well operates in the oil mode, the horizontal wellbore of which is located below the GOC at a distance of up to 1/3 of the oil-saturated thickness. The tubing 5 is lowered into the well to the depth of the head of the liner 1 and perforation 8 of the production string 12 is performed in the zone of the gas-saturated interval of the gas or gas condensate cap.

The valve 9 for controlling the flow of gas from the gas-saturated interval of the gas or gas-condensate cap is closed, and the well is operated on the oil side in a flowing manner with the flow rate and pressure at the wellhead controlled by means of choke 31.

The collection of the extracted raw materials of the multifunctional well is realized by means of a three-pipe gathering system, which includes one low-pressure and two high-pressure systems.

Well products are supplied to OTP 18 via low pressure loop 17.

After separation and treatment, the product of OTP 18 is commercial oil, which is then fed to the external transport system. The OTP 18 includes a compressor unit 24 designed to compress the associated petroleum gas to the pressure required for the treatment process at the GPP 21. After compression, the associated petroleum gas from the OTP 18 is sent to the GPP 21 for further preparation and supply to the external transport system.

Stage 2. Production of gas and condensate from the gas / gas condensate cap of the oil and gas condensate reservoir

With an increase in water cut, accompanied by an increase in pressure losses along the wellbore, as well as in the case of a decrease in oil production to an economically viable limit, below which the well ceases to recoup operating costs at this stage of operation, in a multifunctional well, the overlying gas-saturated interval of the gas cap is connected and a downhole pressureless gas lift. In this case, the shift in emphasis towards gas production allows further profitable operation of the multifunctional well. Conceptually, the organization of downhole compressorless gas lift in a multifunctional well is as follows: gas enters through the perforation interval 8 into the inter-packer annular space 6 of the assembly, from where its flow into the tubing string 5 and mixing with oil fluid is regulated by a special gas flow control valve 9 hydraulically or electrically from the surface through hydraulic or electric lines 2. Gas entering the tubing 5 reduces the bottomhole pressure and increases the depression created on the oil rim of the formation, forming a natural gas lift. To prevent the advance movement of gas along the tubing 5 and complete blocking of production from the oil horizontal wellbore, the design of the assemblies provides for the possibility of regulating the flow of gas with the downhole chokes of the valve 9 for controlling the inflow from the gas or gas condensate cap. Downhole chokes are changed hydraulically from the surface, either with CT or electrical cable.

With an increase in water cut, as well as in the case of a decrease in the well flow rate, it is transferred to the category of gas-producing vertical wells with cutting off the water-cut horizontal wellbore and further exploitation of only the overlying gas-saturated interval of the gas or gas condensate cap.

The cut-off of the bypass horizontal wellbore is performed either by lowering the plug using coiled tubing, or by installing an additional shut-off valve 10.

After cutting off the bypassed horizontal wellbore, the bottom-hole fittings of the valve 9 for controlling the flow of gas from the gas or gas condensate cap are fully opened hydraulically from the surface, either using coiled tubing, or via an electric cable.

After cutting off the bypassed horizontal wellbore, the well is switched to a high-pressure loop 22, and the production of a multifunctional well with high wellhead pressure is fed through the loop 22 to the GTP 21 to separate the droplet moisture, liquid hydrocarbons and mechanical impurities from the gas, and prepare commercial dry gas and gas condensate.

Intermediate stage. Extraction of oil from an oil rim and breakthrough gas and condensate from a gas or gas condensate cap of an oil and gas condensate reservoir.

In case of gas breakthrough from the gas or gas condensate cap to the bottom of the well, accompanied by an increase in the gas factor, wellhead and line pressures, choke is performed. Choking involves changing the size of the choke 31 from the maximum possible to the minimum in the event that the line pressure after the choke 31 becomes higher than the value at which trouble-free operation into the low pressure network is possible.

At the first stage of operation, the main function of a multifunctional well is to extract oil from an oil rim. In the case of the presence of an impermeable clay barrier between the wellbore and the GOC, breakthroughs of gas cones to the bottom do not occur, and the well operates into a low-pressure network through loop 17 for almost the entire duration of its operation.

With the breakthrough of gas from the gas or gas condensate cap to the wellbore, accompanied by an increase in GOR and wellhead pressure, the well is transferred to the category of "oil with a high GOR". Its main function at this stage of operation is the production of oil from the oil rim, as well as breakthrough gas and condensate from the gas or gas condensate cap.

During operation, a situation may arise when the well will be clamped (choke 31 has a minimum size), but due to gas breakthrough to the bottom, the line pressure after choke 31 will exceed the safety-relevant value, and further operation of the well into the low-pressure loop 17 will become impossible ... In this case, the multifunctional well is switched from the low pressure loop 17 to the high pressure loop 30 in order to continue its further operation. If the volume of associated and breakthrough gas supplied to the OTP 18 together with oil and condensate through the low pressure loop 17 exceeds the maximum allowable gas volume that the OTP 18 can prepare, the multifunctional well is switched from the low pressure loop 17 to the high loop 30 pressure.

When the multifunctional well is switched from the low pressure loop 17 to the high pressure loop 30, the well moves to the next stage of operation, where its main function, in addition to producing oil and associated gas from the oil rim, is also the production of significant volumes of breakthrough gas and condensate from the gas / gas condensate hats. After switching the multifunctional well from the low-pressure loop 17 to the high-pressure loop 30, the production of the wells with high wellhead pressure through the high-pressure loop 30 goes to a separate two-stage high-pressure separator. After the first stage 23 of separation (high pressure), high-pressure gas under its own pressure is supplied through the loop 19 to the booster compressor station 20, and then to the gas processing unit 21, and the separated oil and condensate are fed through the loop 28 to the second stage 25 of separation (low pressure). After the second stage 25 of separation, the separated gas, oil and condensate are jointly supplied to the OTP 18 via the train 16 for further oil treatment and delivery to the external transport system.

The claimed technical solution provides the possibility of sequential production of various types of hydrocarbons from oil and gas condensate wells without intermediate changes in the production system, additional installation / dismantling works.

Claims (7)

1. A method of complex production of hydrocarbons from oil and gas condensate wells, including the installation of a production string containing a perforated zone with a liner, lowering the production string with production equipment into the production string and sealing the space between the production tubing string and the production string using two packers, one of which they are installed below and the other above the perforation zone of the production casing, characterized in that further at the first stage, oil is pumped out of the oil rim of the formation through the liner of the production casing horizontally installed in the oil rim of the formation with a closed gas flow control valve placed on the pumping string. compressor pipes between the packers, supplying oil through a low-pressure loop to the oil treatment unit, at the second stage, with an increase in the water cut of the produced product until the flowing stops, the liner is cut off and the gas is pumped out and from the gas or gas condensate cap through the perforation zone in the production string with the gas inflow valve open, supplying gas through the first high-pressure loop to the integrated gas treatment unit, and when gas breaks through from the gas or gas condensate cap during the oil pumping process, joint pumping is carried out at the first stage oil from the oil rim and breakthrough gas through the liner of the production casing with a closed gas inflow control valve and the supply of the obtained oil and gas mixture through the low pressure loop to the oil treatment unit, and with an increase in the volume of associated and breakthrough gas above the maximum allowable for the oil treatment unit, switching the oil and gas supply mixture into the second high-pressure loop for separation, after which the separated oil is sent to the oil treatment unit, and gas - to the complex gas treatment unit. 2. The method according to claim 1, characterized in that the associated and / or breakthrough gas separated at the oil treatment unit is compressed and sent to the integrated gas treatment unit. 3. A system for implementing the method of complex production of hydrocarbons from oil and gas condensate wells, containing a multifunctional well and a subsystem for collecting and preparing products of a multifunctional well, characterized in that the multifunctional well includes a production casing string, a tubing string installed inside it and installed in the upper part of both wellhead equipment, the production casing string contains a perforation zone in the area of the gas or gas condensate cap, in the annulus between the tubing string and the production string there are two seal packers, one below the production string perforation zone, and the second - above, while the string tubing contains a downhole pressure and temperature sensor and a gas flow control valve from the production casing located between the packers, a subsystem for collecting and preparing products of a multifunctional well The wells include two high-pressure trains and a low-pressure train connected to the wellhead equipment through the choke and valves, the low-pressure train is connected to the oil treatment unit, the first high-pressure train is connected to the complex gas treatment unit, and the second high-pressure train is connected to a two-stage separator, the outlet the gas of the first stage of the separator is connected to the first high pressure loop, the gas and liquid outlet of the second stage of the separator is connected to the low pressure loop. 4. The system of claim. 3, characterized in that the outlet of the oil treatment unit for associated petroleum gas is connected to the inlet of the compressor unit, which is connected by its outlet to the complex gas treatment unit. 5. The system of claim. 3, characterized in that the first high-pressure loop is connected to the complex gas treatment unit through a booster compressor station. 6. The system according to claim 3, characterized in that a circulation sleeve is installed in the tubing string above the packers. 7. The system according to claim 3, characterized in that a shut-off valve is installed in the tubing string below the packers.

Images