A gas storage injection and production well injection and production device and a method for inducing spraying and draining liquid

Abstract

The present invention belongs to the technical field of liquid drainage of gas injection and production wells in gas storage reservoirs, and specifically relates to an injection and production device for injection and production wells in gas storage reservoirs and a method for induced spraying and liquid drainage, wherein the device comprises a gas injection manifold, a gas production manifold, and a plurality of injection and production pipelines; the gas injection manifold is connected to a gas injection and pressure-injection device to receive gas injected by the gas injection and pressure-injection device; one end of each injection and production pipeline is connected to the gas injection manifold through a corresponding first gas injection pipeline, and is also connected to the gas production manifold through a corresponding first gas production pipeline, and the other end is connected to a corresponding gas production tree through a corresponding second gas injection pipeline and a second gas production pipeline arranged in parallel; a pressure regulating device and a gas production control valve are both provided on the first gas production pipeline and the second gas production pipeline; a gas injection control valve is both provided on the first gas injection pipeline and the second gas injection pipeline, and the gas injection control valve is a two-way valve. The present invention can safely carry out injection, gas production operations and induced spraying and liquid drainage operations, has simple equipment, low cost, and high efficiency and safety during induced spraying and liquid drainage operations.

Description

Technical Field

[0001] The invention belongs to the technical field of liquid drainage of injection and production wells of gas storage reservoirs, and in particular relates to an injection and production device of injection and production wells of gas storage reservoirs and a method for inducing liquid drainage. Background Art

[0002] During the multi-cycle injection and production operation of depleted sandstone gas storage, the well site density needs to be increased because the working gas volume does not meet the design requirements. There is a problem of backflow of wellbore fluid in the tubing after drilling new injection and production wells or repairing of injection and production wells. In the early stage of gas storage construction, due to the low formation pressure, the wellbore fluid can be squeezed into the reservoir through the gas injection compressor in the injection and production station. After the gas storage is operating normally, due to the high formation pressure, the compressor outlet pressure cannot meet the demand of squeezing the liquid column in the wellbore into the reservoir, and long-term pressure injection increases the risk of on-site operation.

[0003] At present, there are two ways to induce blowout in gas wells in gas fields. One is to use continuous tubing to induce blowout by nitrogen gas lift. This method is safe to construct, but the construction cost is high and the construction process is complicated. It requires nitrogen production equipment and continuous tubing operation equipment. The second is to use well testing wire tools to induce blowout. Nitrogen is injected into the tubing to discharge the liquid in the tubing string into the annulus, and the purpose of inducing blowout is achieved by releasing the gas in the tubing string on the ground. However, the construction process is complicated and can easily cause operating errors of the well testing tools or engineering accidents. In addition, to ensure safety, gas storage wells are equipped with packers in the annulus, and liquid cannot be discharged through the annulus.

[0004] For example, the Chinese invention patent application document with application publication number CN113356805A discloses an inter-well turbulent gas lift blowout inducing device, comprising: a well-killing manifold arranged outside the wellbore, and a digital control device connected to the well-killing manifold; wherein the first path of the digital control device: is provided with: a plurality of temporary well service oil pipe control valves installed on the pipeline, the pipeline is in a cross shape, and each of the cross-shaped pipelines has a temporary well service oil pipe control valve; wherein the temporary well service oil pipe control valve at one end is also connected to the oil pressure gauge of the fault well through the pipeline; wherein the temporary well service oil pipe at the other end is connected to the oil pressure gauge of the fault well through the pipeline; The control valve is also connected to the stepped pipeline through a pipeline; the second route in the digital control device is provided with: several fault well service oil pipe control valves installed on the pipeline, the pipeline is cross-shaped, and each cross-shaped pipeline has a fault well service oil pipe control valve, a fault well production control valve, and a fault well production main valve; and the fault well service oil pipe control valve is connected to the fault well oil pressure gauge through a pipeline; the fault well production control valve is connected to the fault well oil nozzle and the closed drain tank through a pipeline, and the closed drain tank is connected to the flare head; the fault well production main valve at the other end is also connected to the stepped pipeline through a pipeline. The patent application document with publication number CN113356805A only discloses the structure of the induced spraying and drainage operation, but does not disclose the structure of the gas production operation, and cannot solve the problem of how to inject and produce gas and have induced spraying and drainage at the same time. How to complete the injection and production operations and induce spraying and drainage of injection and production wells, reduce the operation cost and operation risk, has become an urgent problem to be solved on site. Summary of the invention

[0005] The purpose of the present invention is to provide a gas storage reservoir injection and production well injection and production device with a simple structure, high safety, and capable of simultaneously realizing injection, production and induced blowout. At the same time, a gas storage reservoir injection and production well injection and production device is also provided, which is based on the gas storage reservoir injection and production well injection and production device and has high efficiency, saves resources and has high safety to induce blowout and discharge liquid.

[0006] In order to solve the above technical problems, the technical solutions provided by the present invention and the corresponding beneficial effects of the technical solutions are as follows:

[0007] The present invention provides a gas storage injection and production well injection and production device, comprising a gas injection manifold, the gas injection manifold is connected to a gas injection and pressure boosting device, and receives gas injected by the gas injection and pressure boosting device; the device is characterized in that: the device also includes a gas production manifold, and a plurality of injection and production pipelines;

[0008] One end of each injection and production pipeline is connected to the gas injection manifold through a corresponding first gas injection pipeline, and is also connected to the gas production manifold through a corresponding first gas production pipeline, and the other end is connected to the corresponding gas production tree through a corresponding second gas injection pipeline and a second gas production pipeline arranged in parallel; the gas injection boosting equipment includes a multi-stage boosting equipment driven by a driving device;

[0009] The first gas production pipeline and the second gas production pipeline are both provided with a pressure regulating device and a gas production control valve;

[0010] The first gas injection pipeline and the second gas injection pipeline are both provided with a gas injection control valve, and the gas injection control valve is a two-way valve.

[0011] The beneficial effects of the above technical solution are:

[0012] The device of the present invention separates the gas injection and gas production pipelines. During the gas injection period, gas can be injected using a gas injection booster, and the gas to be injected flows to the gas production tree through the first gas injection pipeline, the injection and production pipeline, and the second gas injection pipeline to realize the gas injection process. During the gas production period, the gas produced in the gas production tree can also be introduced into the gas production manifold through the second gas production pipeline, the injection and production pipeline, and the first gas production pipeline to realize the gas production process, and during gas production, pressure regulating devices are provided on both the second gas production pipeline and the first gas production pipeline, and two-stage pressure regulation ensures that the gas production process is safe and reliable. At the same time, during the stop injection stage or gas production stage of the gas storage, the high-pressure gas source of the adjacent well can be used as the gas injection source through the gas injection manifold connected to the second gas injection pipeline of the adjacent well, and then introduced into the gas injection manifold by the first gas injection pipeline of the adjacent well, and the gas source is controlled by the gas injection manifold through the gas injection control valve on the first gas injection pipeline of the liquid accumulation well to enter the injection and production pipeline of the liquid accumulation well, and finally, the high-pressure gas source is injected into the wellbore of the liquid accumulation well through the first gas injection pipeline of the liquid accumulation well, realizing the function of inducing spraying and draining. The device introduces the high-pressure gas source of the adjacent well from the second gas injection pipeline and the first gas injection pipeline into the gas injection manifold without the need for the pressure regulating device of the second gas production pipeline and the first gas production pipeline, thereby ensuring the pressure of the high-pressure natural gas in the gas reservoir.

[0013] The present invention has multiple functions. First, it can realize the injection and gas production process. Second, it can also perform gas lift induced blowout operations, effectively saving capital costs. Third, the use of the present invention for gas lift induced blowout operations does not require the use of other resources such as nitrogen, which effectively improves safety. In short, the equipment and process of the present invention are simple, occupying less land in the station. When the present invention is used for injection, gas production and induced blowout and drainage operations, it is easy to operate and maintain, greatly reducing the operation preparation time and the number of operators, and has strong practicality.

[0014] Furthermore, each of the pressure regulating devices provided on the second gas production pipeline includes a gas nozzle, and the gas nozzle is used to reduce the high-pressure gas in the gas reservoir to a safe range.

[0015] Furthermore, in order to ensure safety within the station, the pressure regulating device provided on the first gas production pipeline is a labyrinth pressure regulating valve, which is used to stabilize the pressure within the injection and production station within a safe range.

[0016] Furthermore, in order to remotely shut down the ground safety valve installed on the gas production tree in an emergency, a ground safety valve is provided on the gas production tree pipeline at one end of each gas production tree connected to the corresponding injection and production pipeline; the pressure regulating device installed on each of the second gas production pipelines also includes a low-pressure pressure limiting valve; the device also includes a wellhead control cabinet, and the ground safety valve and the low-pressure pressure limiting valve are both connected to the control cabinet.

[0017] Furthermore, the device also includes a reverse metering pipeline, one end of which is connected to each first gas production pipeline through a corresponding reverse metering control valve, and the other end is connected to the inlet of the metering separator; the metering separator is provided with a drain port, and the drain port is connected to the drain pipeline.

[0018] The beneficial effects of the above technical solution are:

[0019] The injection and production pipelines are connected with the gas injection manifold, gas production manifold and reverse metering pipelines in the injection and production station respectively, connecting the well site process with the process within the injection and production station, realizing the switching between the injection and production process and the reverse metering process, adopting the process flow within the station, simple equipment, easy installation, and effectively saving capital costs.

[0020] Furthermore, the metering separator is also provided with a first exhaust port and / or a second exhaust port; the first exhaust port is connected to the venting torch; the second exhaust port is connected to the downstream gas production process equipment so that the separated gas enters the downstream gas production process; the metering separator is also provided with a liquid level meter for monitoring the liquid level in the metering separator.

[0021] The beneficial effects of the above technical solution are:

[0022] The present invention is used for gas lift induced blowout operation. After the wellbore blowout is induced, the natural gas is burned through the venting torch, or in the gas injection production process, it enters the gas injection compressor unit through the gas injection compressor unit intake pipeline to be pressurized and enter the downstream gas production process, reducing environmental pollution problems. In addition, the metering separator is provided with a liquid level meter to effectively avoid the metering separator from operating at an over-liquid level.

[0023] Furthermore, the injection and production pipeline, the gas production manifold, the gas injection manifold, the first gas production pipeline and the gas tree are all provided with pressure transmitters; the injection and production pipeline, the first gas production pipeline and the gas tree are all provided with temperature transmitters.

[0024] Furthermore, the injection and production pipeline is also provided with an emergency cut-off track ball valve and a single well flow meter; the first gas production pipeline is also provided with a double-acting shut-off valve; the gas injection and boosting equipment is provided with an overpressure reflux pneumatic control valve; the device also includes a vent pipeline, the vent pipeline is connected to the gas injection manifold, and an emergency vent valve is provided on the vent pipeline.

[0025] Furthermore, in order to realize data collection and automatic control of the production process, the temperature transmitter, pressure transmitter connection, overpressure reflux pneumatic control valve, emergency cut-off track ball valve and emergency vent valve are respectively connected to the SCADA system and the ESD system.

[0026] The present invention provides a method for inducing liquid discharge based on an injection-production device of a gas storage reservoir injection-production well, and the method for inducing liquid discharge comprises the following steps:

[0027] Step 1:

[0028] 101) Open the gas production control valve set on the second gas production pipeline on the normal gas well pipeline and adjust the pressure regulating device, introduce the high-pressure gas source of the normal gas well gas tree into the corresponding injection and production pipeline through the second gas production pipeline on the normal gas well pipeline, close the gas production control valve on the corresponding first gas production pipeline, and then open the two-way gas injection control valve on the corresponding first gas injection pipeline, and introduce the high-pressure gas source into the gas injection manifold through the corresponding first gas injection pipeline;

[0029] 102) Open the two-way gas injection control valve on the first gas injection pipeline on the liquid-filled gas well pipeline, re-introduce the high-pressure gas source obtained from the gas injection manifold into the corresponding first gas injection pipeline, open the gas injection control valve on the corresponding second gas injection pipeline, enter the corresponding second gas injection pipeline through the corresponding injection-production pipeline, and introduce the gas into the liquid-filled gas well from the corresponding second gas injection pipeline;

[0030] Step 2: Stifle the well;

[0031] Step 3:

[0032] 301) close the two-way gas injection control valve on the first gas injection pipeline on the normal gas well pipeline, and close the two-way gas injection control valve on the first gas injection pipeline on the liquid accumulation gas well pipeline, so as to conduct the gas production and injection induction process of the liquid accumulation gas well;

[0033] 302) The accumulated liquid passes through the second gas production pipeline on the accumulated liquid gas well pipeline and then enters the injection and production station through the corresponding injection and production pipeline, so as to be introduced into the enterprise separation equipment for gas-liquid separation;

[0034] Step 4: Repeat steps 1 to 3 to allow the accumulated fluid to drain completely.

[0035] The beneficial effects of the above technical solution are:

[0036] The method for inducing spraying and draining of the present invention utilizes high-pressure gas from adjacent wells to introduce high-pressure gas into the liquid-accumulated well through the injection and production pipeline, the first gas injection pipeline and the gas injection manifold. On the one hand, the use of numerous equipment such as coiled tubing and control equipment is reduced, thereby reducing the use of the well site and the area surrounding the well site, providing sufficient space for the well site injection and production of gas production, improving the injection and production efficiency of gas production, and saving the drainage operation time in the wellbore. On the other hand, the method for inducing spraying and draining of the present invention simplifies the gas lift induced spraying operation process, reduces the operation cost, and is conducive to saving resources. In addition, the use of the present invention for gas lift induced spraying operations does not require the use of other resources such as nitrogen, which effectively improves safety.

[0037] Furthermore, before step 1, it also includes emergency shutdown system debugging to ensure the normal well shut-in function in an emergency, the real-time monitoring function of the central control, and the compressor shutdown and compressor overpressure reflux and injection and production gas manifold venting functions under overpressure conditions. BRIEF DESCRIPTION OF THE DRAWINGS

[0038] Figure 1 It is a schematic diagram of the process flow in an injection and production station of an injection and production device for an injection and production well of a gas storage reservoir of the present invention;

[0039] Figure 2 It is a schematic diagram of a well field process flow of an injection and production device for an injection and production well of a gas storage reservoir according to the present invention.

[0040] In the figure: 1. Gas injection compressor unit; 1-1. Gas injection compressor unit air intake pipeline; 1-2. Gas injection compressor unit exhaust pipeline; 1-3. Gas injection compressor unit overpressure return pneumatic control valve; 1-4. Gas injection compressor unit overpressure return pipeline; 1-5. Driving device; 1-6. First-stage booster; 1-7. Second-stage booster; 2-Gas injection manifold; 3-Gas production manifold; 2-1. Pressure transmitter; 3-1. Pressure transmitter; 2-2. Emergency vent valve; 3-2. Emergency vent valve; 2-3. Vent pipeline; 3-3. Vent pipeline; 4. Single well injection and production pipeline; 5. Single well Injection and production pipeline; 4-1. Emergency cut-off track ball valve; 5-1. Emergency cut-off track ball valve; 4-2. Temperature transmitter; 5-2. Temperature transmitter; 4-3. Pressure transmitter; 5-3. Pressure transmitter; 4-4. Single well flow meter; 5-4. Single well flow meter; 4-5. Gas production plug valve; 5-5. Gas production plug valve; 4-6. Labyrinth pressure regulating valve; 5-6. Labyrinth pressure regulating valve; 4-7. Pressure transmitter; 5-7. Pressure transmitter; 4-8. Double-acting shut-off valve; 5-8. Double-acting shut-off valve; 4-9 Gas injection plug valve; 5-9. Gas injection plug valve; 4-10. Gas production plug valve; 5-10. Gas production plug valve; 4-11. Single well reverse metering plug valve; 5-11. Single well reverse metering plug valve; 6. Metering separator; 6-1. Liquid level meter; 6-2. Drain pipeline; 6-3. Gas flow meter; 6-4. Plug valve; 6-7. Plug valve; 7. Flare; 11. Single well reverse metering pipeline; 8. Gas tree; 9. Gas tree; 8-1. Production main valve; 8-4. Production main valve; 8-2. Wellhead oil pressure transmitter; 9-2. Wellhead oil pressure transmitter; 8-3. Wellhead oil temperature transmitter transmitter; 9-3. Wellhead oil temperature transmitter; 8-5. Ground safety valve of gas tree; 9-5. Ground safety valve of gas tree; 8-8. Production valve of gas tree flank; 9-8. Production valve of gas tree flank; 4-A. Second single well gas injection pipeline; 5-A. Second single well gas injection pipeline; 4-B. Second single well gas production pipeline; 5-B. Second single well gas production pipeline; 4-C. Air nozzle; 5-C. Air nozzle; 4-D. Low pressure limiting valve; 5-D. Low pressure limiting valve; 4-E. Temperature transmitter; 5-E. Temperature transmitter; 10. Wellhead control cabinet; 10-1. Hydraulic pipeline. DETAILED DESCRIPTION

[0041] An embodiment of an injection and production device for an injection and production well of a gas storage reservoir:

[0042] The present invention discloses an injection and production device for injection and production wells in a gas storage reservoir, which is used for inducing drainage and injecting and producing gas in liquid-filled wells. The device comprises: a gas injection manifold, a gas production manifold, and a plurality of injection and production pipelines; the gas injection manifold is connected to a gas injection and pressure-boosting device to receive gas injected by the gas injection and pressure-boosting device; one end of each injection and production pipeline is connected to the gas injection manifold through a corresponding first gas injection pipeline, and is also connected to the gas production manifold through a corresponding first gas production pipeline, and the other end is connected to a corresponding gas production tree through a corresponding second gas injection pipeline and a second gas production pipeline arranged in parallel; a pressure regulating device and a gas production control valve are both provided on the first gas production pipeline and the second gas production pipeline; a gas injection control valve is both provided on the first gas injection pipeline and the second gas injection pipeline, and the gas injection control valve is a two-way valve.

[0043] In this embodiment, Figure 1 , Figure 2 As shown, preferably, the gas injection control valves provided on the first gas injection pipeline and the second gas injection pipeline are gas injection plug valves, and the gas production control valves provided on the first gas production pipeline and the second gas production pipeline are gas production plug valves, wherein the gas injection plug valves and the gas production plug valves are not limited to plug valves in other feasible implementations. The injection and production pipelines are single-well injection and production pipelines, the first gas injection pipeline and the second gas injection pipeline are single-well gas injection pipelines, which are respectively recorded as the first single-well gas injection pipeline and the second single-well gas injection pipeline, and the first gas production pipeline and the second gas production pipeline are single-well gas production pipelines, which are respectively recorded as the first single-well gas production pipeline and the second single-well gas production pipeline. In this embodiment, two injection and production pipelines are used, such as Figure 1 The single well injection and production pipeline 4 and the single well injection and production pipeline 5 are respectively connected to each gas production tree. Figure 2 In the gas production tree 8 and the gas production tree 9, the number of injection and production pipelines and the number of corresponding connected gas production trees are not limited in other feasible implementations. The gas injection boosting equipment includes a multi-stage boosting equipment driven by a driving device 1-5. The driving device adopts a diesel engine, preferably a gas engine. The multi-stage boosting equipment in this embodiment is a two-stage boosting equipment, that is, a first supercharger 1-6 and a second supercharger 1-7. The first supercharger 1-6 and the second supercharger 1-7 are arranged through a two-stage shaft connection and driven by a gas engine, so that the first supercharger 1-6 is compressed to a set compression ratio, and the second supercharger 1-7 is compressed to reach a target compression ratio.

[0044] In this embodiment, preferably, the gas injection boosting equipment is a gas injection compressor unit 1, and in other feasible embodiments, it is not limited to the gas injection compressor unit 1. In this embodiment, the pressure regulating device provided on the first single-well gas production pipeline is preferably a labyrinth pressure regulating valve. The pressure regulating device provided on each second single-well gas production pipeline is preferably a gas nozzle and a low-pressure limiting valve.

[0045] The gas injection compressor unit 1 is connected to the gas tree through the gas injection manifold and the single well injection and production pipeline. The production valve on the side of the gas tree is connected to the second single well gas injection pipeline and the second single well gas production pipeline in the well field. The second single well gas injection pipeline and the second single well gas production pipeline are connected to the single well injection and production pipeline. After entering the injection and production station, the single well injection and production pipeline in the well field is connected to the gas injection manifold and the gas production manifold, thereby connecting the injection and production well and the gas injection manifold in the station to perform drainage and injection induction operations.

[0046] In order to realize the drainage function, the device also includes a reverse metering pipeline, one end of which is connected to each first single-well gas production pipeline through a corresponding reverse metering control valve, and the other end is connected to the inlet of the metering separator; the reverse metering control valve is preferably a reverse metering plug valve. The metering separator is provided with a liquid discharge port, which is connected to the liquid discharge pipeline. In this embodiment, the metering separator is also provided with a first exhaust port and a second exhaust port; the first exhaust port is connected to the venting torch; the second exhaust port is connected to the downstream gas production process equipment so that the separated gas enters the downstream gas production process. In another feasible embodiment, the metering separator is also provided with a first exhaust port, and the first exhaust port is connected to the venting torch. In another feasible embodiment, the metering separator is also provided with a second exhaust port, and the second exhaust port is connected to the downstream gas production process equipment so that the separated gas enters the downstream gas production process.

[0047] In order to ensure the safety within the station, a gas nozzle 4-C (gas nozzle 5-C) is installed at the well site on the second single-well gas production pipeline 4-B (second single-well gas production pipeline 5-B) connected to the single-well injection and production pipeline 4 (single-well injection and production pipeline 5) to reduce the high-pressure gas in the gas reservoir to about 13MPa at the well site.

[0048] The first single-well gas production pipeline connected to the single-well injection and production pipeline 4 (single-well injection and production pipeline 5) is equipped with a labyrinth pressure regulating valve 4-6 (labyrinth pressure regulating valve 5-6) in the injection and production station. Through two-stage throttling, the pressure in the station is automatically controlled and stabilized between 6-7.6MPa to ensure the safety of the station and the process parameter requirements.

[0049] The gas in the single-well injection and production pipeline is connected to the gas production manifold and the single-well reverse metering pipeline after pressure regulation. The single-well reverse metering pipeline separates gas and liquid through the metering separator and measures the liquid production of the single well. The gas separated in the metering separator is burned through the venting torch or enters the downstream gas production process to avoid polluting the environment. Furthermore, in order to ensure safety, the metering separator liquid level gauge is equipped with a high liquid level alarm on the central control host computer to prevent the separator from operating at an over-liquid level.

[0050] In order to respond to emergency evacuation, the gas tree ground safety valve 8-5 (gas tree ground safety valve 9-5) installed on the gas tree 8 (gas tree 9) is connected to the wellhead control cabinet 10 through the hydraulic pipeline 10-1, and the low-pressure pressure limiting valve 4-D (low-pressure pressure limiting valve 5-D) installed on the second single-well gas production pipeline is interlocked with the wellhead control cabinet to realize the remote shutdown of the ground safety valve installed on the gas tree in an emergency, and realize the remote transmission function of the wellhead data and the data of the injection and production station control room.

[0051] In order to realize data collection and automatic control of the production process of the device, the device also includes data collection equipment, which is connected to the SCADA system and the ESD system respectively. The data collection equipment includes a temperature transmitter and a pressure transmitter; the temperature transmitter is set on the injection and production pipeline, the first single-well gas production pipeline, and the gas production tree; the pressure transmitter is set on the injection and production pipeline, the gas production manifold, the gas injection manifold, the first single-well gas production pipeline, and the gas production tree. In order to trigger emergency shutdown and venting when pipeline pressure is overpressured and gas leaks during the gas injection process, the emergency cut-off track ball valve 4-1 (emergency cut-off track ball valve 5-1), pressure transmitter 4-3 (pressure transmitter 5-3), pressure regulating pressure transmitter 4-7 (pressure transmitter 5-7) set on the first single well gas production pipeline, and emergency vent valve 2-2 and emergency vent valve 3-2 set on the gas injection manifold 2 are interlocked; the pressure transmitter 2-1 set at the outlet end of the gas injection manifold 2 is interlocked with the overpressure reflux pneumatic control valve 1-3 of the gas injection compressor unit (overpressure reflux pneumatic control valve 1-4 of the gas injection compressor unit); the low-pressure limiting valve 4-D (low-pressure limiting valve 5-D) is interlocked with the wellhead control cabinet 10. The injection and production pipeline 2 is also provided with a single well flow meter 4-4 (single well flow meter 5-4); the first single well gas production pipeline is also provided with a gas production plug valve 4-5 (gas production plug valve 5-5) and a double-acting shut-off valve 4-8 (double-acting shut-off valve 5-8).

[0052] Specifically, the single-well injection and production pipeline 4 (single-well injection and production pipeline 5) is connected to the gas tree 8 (gas production tree 9) in the well site through the second single-well gas injection pipeline 4-A (second single-well gas injection pipeline 5-A) and the second single-well gas production pipeline 4-B (second single-well gas production pipeline 5-B), and the second single-well gas production pipeline 4-B (second single-well gas production pipeline 5-B) is equipped with a gas nozzle 4-C (gas nozzle 5-C), a low-pressure pressure limiting valve 4-D (low-pressure pressure limiting valve 5-D), and a temperature transmitter 4-E (temperature transmitter 5-E). The single-well injection and production pipeline is connected to the gas injection manifold 2, the gas production manifold 3, and the single-well reverse metering pipeline 11 in the injection and production station, respectively, connecting the well site process with the process within the injection and production station, realizing the switching of the single-well gas injection and production process and the reverse metering process, and saving the installation of pipelines within the station.

[0053] Specifically, the gas injection manifold 2 is provided with a pressure transmitter 2-1 and an emergency vent valve 2-2, the gas production manifold 3 is provided with a pressure transmitter 3-1 and an emergency vent valve 3-2, the emergency vent valve 2-2 (emergency vent valve 3-2) is connected to the vent pipeline 2-3 (vent pipeline 3-3), the single well injection and production pipeline 4 (single well injection and production pipeline 5) is connected to the gas injection manifold 2 and the gas production manifold 3 in the injection and production station, and an emergency cut-off track ball valve 4-1 is provided on the single well injection and production pipeline in the injection and production station (Emergency cut-off track ball valve 5-1), pressure transmitter 4-3 (pressure transmitter 5-3), pressure transmitter 4-7 (pressure transmitter 5-7), temperature transmitter 4-2 (temperature transmitter 5-2), single well flow meter 4-4 (single well flow meter 5-4), gas production plug valve 4-5 (gas production plug valve 5-5), labyrinth pressure regulating valve 4-6 (labyrinth pressure regulating valve 5-6) and double-acting shut-off valve 4-8 (double-acting shut-off valve 5-8). Field instruments such as temperature transmitters and pressure transmitters all have remote transmission functions, which can be monitored in real time in the central control and can detect abnormal working conditions on site in time.

[0054] An embodiment of a method for inducing fluid flow and drainage based on an injection and production device of a gas storage reservoir injection and production well:

[0055] The following is an explanation of the process of normal gas injection and production using an injection and production device for an injection and production well of a gas storage reservoir according to the present invention.

[0056] To facilitate understanding of the technical solution, two injection and production pipelines are used below to describe the normal gas injection process and the normal gas production process.

[0057] Normal gas injection process: Figure 1 As shown, the gas is pressurized by the gas injection compressor unit 1 through the gas injection compressor unit intake pipeline 1-1, and then enters the gas injection manifold 2 through the gas injection compressor unit exhaust pipeline 1-2. The high-pressure gas in the gas injection manifold is controlled by the gas injection plug valve 4-9 (gas injection plug valve 5-9) to enter the single well injection and production pipeline 4 (single well injection and production pipeline 5) respectively, and the single well injection and production pipeline 4 (single well injection and production pipeline 5) enters Figure 2 After the middle well site, the second single well gas injection pipeline 4-A (second single well gas injection pipeline 5-A) is connected to the gas tree 8 (gas tree 9) to complete the gas injection.

[0058] The normal gas production process is as follows: Figure 2 As shown, after the natural gas in the reservoir is produced through the gas production tree 8 (gas production tree 9), it enters the single well injection production pipeline 4 (single well injection production pipeline 5) through the second single well gas production pipeline 4-B (second single well gas production pipeline 5-B), and then enters the single well injection production pipeline Figure 1In the middle injection and production station, the pressure is controlled by the gas production cyclone valve 4-5 (gas production cyclone valve 5-5) and the labyrinth pressure regulating valve 4-6 (labyrinth pressure regulating valve 5-6) in turn, and then controlled by the gas production cyclone valve 4-10 (gas production cyclone valve 5-10) to enter the gas production manifold 3 or enter the metering separator 6 through the single well reverse metering plug valve 4-11 and the single well reverse metering plug valve 5-11. The metering separator can be used to measure the gas and liquid production of a single well.

[0059] The following is an explanation of the use of a gas storage reservoir injection and production well injection and production device of the present invention to carry out a liquid accumulation well blowout induction operation.

[0060] What is particularly important is that the present invention can also be used to induce blowout and drain liquid from injection and production wells of gas storage facilities. There are two types of high-pressure gas source systems. During the gas injection period, the gas injection compressor unit 1 can be used to inject gas. During the gas shutdown period or gas production period, the high-pressure natural gas from the gas reservoir can be introduced into the liquid accumulation well through the single-well injection and production pipeline and the gas injection manifold by using the neighboring wells. During the gas injection production process, the natural gas enters the gas injection compressor unit 1 through the air inlet pipeline of the gas injection compressor unit 1 for pressurization. After pressurization, the natural gas enters the gas injection manifold through the compressor outlet pipeline. During the injection shutdown stage or gas production stage of the gas storage facility, the high-pressure gas source from the neighboring well can be introduced into the gas injection manifold as the gas injection gas source through the gas injection manifold. The gas injection manifold controls the single-well injection and production pipeline through the gas injection plug valve. The process within the injection and production station is connected to the well field gas production tree through the single-well injection and production pipeline. The high-pressure gas source is injected into the wellbore of the liquid accumulation well through the single-well injection and production pipeline.

[0061] In the following, it is assumed that the gas production tree 8 is a gas production tree for a gas well with liquid accumulation in the wellbore, referred to as a liquid accumulation gas well, and the gas production tree 9 is a gas production tree for a normal gas well, referred to as a normal gas well, and the operation steps of the liquid accumulation well blowout induction operation using the present invention are further described in detail: High-pressure gas source system: During the gas injection period, a compressor can be used to inject gas, and the gas is pressurized by the gas injection compressor unit 1 through the gas injection compressor unit intake pipeline 1-1, and then enters the gas injection manifold 2 through the gas injection compressor unit exhaust pipeline 1-2. During the gas storage reservoir stop injection stage or gas production stage, the high-pressure gas source of the normal gas well gas production tree can be introduced into the gas injection manifold 2 as the gas injection gas source. The specific operation is: open the ground safety valve 9-5 of the normal gas well gas tree, the gas tree side production valve 9-8, the second single-well gas injection pipeline 5-A and the second single-well injection and production pipeline 5 connected to the normal gas well through the normal gas well, and then enter the injection and production station, open the emergency cut-off track ball valve 5-1 and the gas injection plug valve 5-9 on the first single-well gas injection pipeline, and the high-pressure gas source in the normal gas well gas tree can be introduced into the gas injection manifold 2.

[0062] The high-pressure gas source in the gas injection manifold 2 can be introduced into the gas tree of the gas well with liquid accumulation in the wellbore as the source of the induced gas injection by the gas injection process of the gas tree. The specific operation is: open the gas injection plug valve 4-9 on the first single-well gas injection pipeline connected to the gas tree of the gas well with liquid accumulation, control the gas to enter the single-well injection pipeline 4, and enter the gas tree of the gas well with liquid accumulation through the second single-well gas injection pipeline 4-A at the well site. On the other hand, the present invention also includes a liquid discharge device, and the liquid discharge operation is described below:

[0063] Liquid drainage: Liquid drainage is carried out using the equipment for the gas production process of the injection and production well. The gas-liquid mixture produced by the gas production tree of the gas well with liquid accumulation in the wellbore enters the single-well gas injection pipeline 4 through the second single-well gas production pipeline 4-B. After the single-well gas injection pipeline 4 enters the injection and production station, it can be controlled by the gas production plug valve 4-10 on the first single-well gas production pipeline to enter the gas production manifold 3, or by the single-well reverse metering plug valve 4-11 connected in parallel with the gas production plug valve 4-10 to enter the single-well reverse metering pipeline 11. The gas-liquid mixture produced in the well enters the metering separator 6 through the single-well reverse metering pipeline 11. The liquid level meter 6-1 is installed on the outside of the metering separator. After separation by the metering separator, the liquid is directly discharged through the sewage pipeline 6-2. The separated gas can be controlled by the plug valve 6-7 to enter the venting torch 7 for combustion; or after being metered by the gas flow meter 6-3, it can be controlled by the plug valve 6-4 to enter the downstream gas production process to avoid environmental pollution.

[0064] The following is an explanation of the entire operational process including induced blowout drainage and preparations before induced blowout drainage. To prevent the process system of the injection and production station from being pressurized, the normal operation of the ESD system needs to be tested before implementation of this measure. Set gas tree 8 as the gas tree for a gas well with liquid accumulation in the wellbore, referred to as the liquid-accumulated gas well, and set gas tree 9 as the gas tree for a normal gas well, referred to as the normal gas well.

[0065] Ⅰ Emergency shutdown system debugging.

[0066] 1) Debug the wellhead control cabinet 10, check the gas tree of the liquid-filled gas well, the gas tree of the normal gas well, and the safety valves of the corresponding gas trees on the ground, that is, Figure 2 After opening the ground safety valve 8-5 of the middle gas tree and the ground safety valve 9-5 of the gas tree, check whether the pilot circuit of the control cabinet, the control pressure of the ground safety valve and the control pressure of the downhole safety valve are within the normal working range, and perform remote shut-off tests on the ground safety valve and the downhole safety valve to ensure normal well shut-in in an emergency;

[0067] 2) Check the data transmission of the wellhead oil pressure transmitter 8-2, wellhead oil temperature transmitter 8-3, wellsite low pressure limiting valve 4-D and temperature transmitter 4-E connected to the liquid-filled gas well, and the pressure transmitter 4-3, pressure transmitter 4-7 and temperature transmitter 4-2 of the injection and production pipeline of a single well in the injection and production station; check the data transmission of the wellhead oil pressure transmitter 9-2, wellhead oil temperature transmitter 9-3, wellsite low pressure limiting valve 5-D and temperature transmitter 5-E connected to the normal gas well, and the pressure transmitter 5-3, pressure transmitter 5-7 and temperature transmitter 5-2 of the injection and production pipeline of a single well in the injection and production station to ensure real-time monitoring by the central control;

[0068] 3) Test the functions of the overpressure reflux control valve 1-3 of the gas injection compressor unit, the emergency cut-off track ball valve 4-1 on the single-well injection and production pipeline 4 connected to the liquid-filled gas well, and the emergency cut-off track ball valve 5-1 connected to the normal gas well, as well as the interlocking of the emergency vent valve 2-2 and the emergency vent valve 3-2 on the injection and production manifold to ensure that the compressor is shut down, the compressor overpressure refluxes, and the injection and production gas manifold is vented under overpressure conditions.

[0069] ⅡInduce spraying and discharge.

[0070] 1. If gas is injected through a compressor, the gas injection process is started, the gas injection compressor unit 1 is started, and the gas injection manifold 2 is introduced through the gas injection compressor unit exhaust pipeline 1-2; if the entire station is in a gas outage period, gas is injected through the normal gas well gas production tree, and the gas tree flank production valve 9-8 of the normal gas well gas production tree and the second single-well gas injection pipeline 5-A on the ground are opened. The gas injection plug valve 5-9 on the single-well injection and production pipeline 5 in the injection and production station is kept in an open state, and the gas production plug valve 5-5, the labyrinth pressure regulating valve 5-6, and the double-acting shut-off valve 5-8 are closed, and the high-pressure gas source is introduced into the gas injection manifold 2 through the first injection and production pipeline. Then open the gas injection process of the gas production tree of the liquid-accumulated gas well, open the gas injection plug valve 4-9 on the first single-well gas injection pipeline connected to the liquid-accumulated gas well, and open it from the high-pressure end to the low-pressure end, and pour the high-pressure natural gas in the gas injection manifold 2 into the well site through the single-well injection and production pipeline 4, connect the gas production tree of the liquid-accumulated gas well and the second single-well gas injection pipeline 4-A, connect the gas production tree flank production wing valve 8-8 and the gas production tree ground safety valve 8-5 of the liquid-accumulated gas well in turn, and then open the production main valve 8-1 and the production main valve 8-4 connected to the liquid-accumulated gas well to introduce the high-pressure gas into the oil pipe of the gas production tree of the liquid-accumulated gas well.

[0071] 2. Well soaking: Keep the process in the first part unchanged for two hours. By increasing the pressure of the wellhead oil pressure transmitter 8-2 connected to the liquid-filled gas well, the liquid column in the wellbore is squeezed into the reservoir, and the gas and liquid in the upper part of the liquid column in the wellbore are mixed.

[0072] 3. Close the gas injection plug valve 5-9 on the first single well gas injection pipeline connected to the gas tree of the normal gas well and the gas injection plug valve 4-9 on the first single well gas injection pipeline connected to the gas tree of the liquid accumulation gas well, conduct the gas production and blowout process of the liquid accumulation gas well, and the drainage system passes through the production wing valve 8-8 on the gas tree flank and the ground safety valve 8-5 of the gas tree of the liquid accumulation gas well, through the second single well gas production pipeline 4-B of the well site, and then through the single well injection and production pipeline 4 to enter the injection and production station, through the single well reverse metering plug valve 4-11 to enter the single well reverse metering pipeline 11, and then through the metering separator 6 for gas-liquid separation, the gas is controlled by the plug valve 6-7 to enter the venting torch 7 or controlled by the plug valve 6-4 to enter the downstream gas production process. Make the gas and liquid in the wellbore of the liquid accumulation well move upward, and the reservoir and lower gas move upward, and invade into the upper liquid of the wellbore to form a gas-liquid mixed flow state.

[0073] 4. The liquid-accumulated gas well process is introduced into the metering separator 6, and the plug valve 6-7 connected to the venting torch 7 is kept open. The accumulated liquid in the wellbore is discharged for gas-liquid separation, the well-killing fluid is discharged through the sewage pipeline, and the gas is burned through the venting torch 7.

[0074] 5. Repeat the above process to increase the liquid columns of the gas-liquid flow. When the amount of accumulated liquid discharged is large and the gas production and liquid discharge are normal, the venting cock 6-7 can be closed to introduce the gas in the metering separator 6 into the downstream gas production process to avoid gas waste.

[0075] 6. After draining the liquid column, start the reservoir natural gas to enter the wellbore to induce gushing and resume production by spontaneous gush.

[0076] The gas lift induced blowout operation that can be performed by the present invention fully utilizes the process flow structure in the gas storage station. During the gas injection period, the gas injection compressor can be used to inject gas. During the gas suspension period or gas production period, the adjacent well can be used to introduce the gas reservoir pressure natural gas into the liquid accumulation well through the gas injection manifold, thereby realizing the cross-continuity of the single well induced blowout and liquid drainage operation and the injection and production of gas in the remaining injection and production wells of the gas storage. The adjacent well high-pressure gas or the gas injection compressor unit 1 is used to introduce the high-pressure gas into the liquid accumulation well through the single well pipeline and the gas injection manifold. On the one hand, the use of many equipment such as continuous oil pipes and control equipment is reduced, thereby reducing the use of the well site and the area around the well site, providing sufficient space for the well site injection and production operation, improving the injection and production efficiency of gas, saving the liquid drainage operation time in the wellbore, and the process simplifies the gas lift induced blowout operation process, reduces the operation cost, and is conducive to saving resources. On the other hand, the exhaust gas in the wellbore can be burned through the venting torch or enter the downstream gas production process after passing through the separator, avoiding gas waste and environmental pollution, and achieving the purpose of reducing costs and increasing efficiency in production management.

[0077] The following is an explanation based on a field example.

[0078] In a certain well, on December 7th, the well was opened for trial injection at 10:45, the well was shut down at 11:45, the well was opened for gas production at 16:05, the gas production process was shut down and the gas injection process was started at 18:05, the well was switched to gas production at 21:00, and on the 8th, it was switched to gas injection at 0:20, switched to gas production at 3:00, switched to gas production at 3:40, and switched to gas injection at 6:30. After four induced spraying and drainage, the metering separator discharged a total of about 3 cubic meters of well killing fluid, and the remaining well killing fluid was pressed into the formation. At 10:15, the well was injected with gas normally.

[0079] Before the test injection, the wellhead pressure dropped rapidly to 0 after being vented through the production valve pressure gauge of the gas production tree. After the first gas injection and well shut-in, the pressure continued to rise to 20.89MPa during the gas injection process, and the temperature rose to 11°C. In the first gas production stage, the wellhead pressure dropped to 8.9MPa at the lowest and then gradually rose to stabilize at 17MPa. The temperature rose to 18.5°C, and the liquid production was less, proving that the formation began to gradually produce gas. After the second gas injection, the temperature was around 17°C, and the pressure rose to 20.89MPa. After gas production, the pressure dropped slightly, and remained stable after dropping to 20MPa, with no further downward trend. The wellhead temperature was stable at around 18°C, thus confirming that the pressure was blocked near the wellbore zone of a certain well, and the change in wellhead oil temperature was mainly affected by weather changes, showing the same change trend as other gas injection wells as a whole. After the third injection and production of induced spraying and drainage, the oil pressure and oil temperature did not change much, proving that there was less residual liquid in the tubing, most of which had been squeezed into the formation, and the wellbore was not connected to the deep reservoir, resulting in no significant drop in oil pressure. After the fourth gas production, the pressure dropped to 17MPa and remained stable. The liquid in the near-well zone was squeezed into the deep reservoir, and the connectivity between the formation and the wellbore was restored. After the formal gas injection at 10:15, the temperature gradually rose to about 30℃. The change trend of the wellhead oil pressure and oil temperature of a well.

[0080] After four injection-production-discharge conversions, the wellhead pressure was 20.87MPa and the wellhead temperature was 36°C on December 8. The instantaneous gas volume of the single-well flowmeter was 9641 cubic meters per hour. The well was successfully put into production and tested.

[0081] Therefore, the injection, gas production and gas lift induced blowout operations that can be carried out using the present invention have simple equipment processes and occupy less space in the station. The injection, gas production and induced blowout and drainage operations are easy to operate and maintain, which greatly reduces the operation preparation time and the number of operators and has strong practicality.

Claims

1. A gas storage reservoir injection and production well injection and production device, comprising a gas injection manifold, wherein the gas injection manifold is connected to a gas injection and pressurizing device to receive gas injected by the gas injection and pressurizing device; characterized in that: The device also includes a gas production manifold and a plurality of injection and production pipelines; one end of each injection and production pipeline is connected to the gas injection manifold through a corresponding first gas injection pipeline, and is also connected to the gas production manifold through a corresponding first gas production pipeline, and the other end is connected to a corresponding gas production tree through a corresponding second gas injection pipeline and a second gas production pipeline arranged in parallel; the gas injection and boosting equipment includes a multi-stage boosting equipment driven by a driving device, the multi-stage boosting equipment is a two-stage boosting equipment, the two-stage boosting equipment includes a first booster and a second booster, the first booster and the second booster are arranged by a two-stage coupling, and are driven by the driving device Drive, so that the first supercharger compresses to a set compression ratio, and the second supercharger compresses to a target compression ratio, the driving device adopts a gas engine; the first gas production pipeline and the second gas production pipeline are both provided with a pressure regulating device and a gas production control valve, the pressure regulating device provided on the first gas production pipeline is a labyrinth pressure regulating valve used to stabilize the pressure in the injection and production station within a safe range, and the pressure regulating device provided on the second gas production pipeline includes a gas nozzle used to reduce the high-pressure gas in the gas reservoir to a safe range; the first gas injection pipeline and the second gas injection pipeline are both provided with a gas injection control valve, and the gas injection control valve is a two-way valve; The injection-production device of the injection-production well of the gas storage reservoir is used to induce blowout and discharge liquid from the liquid-accumulated well. If the induced blowout and discharge occurs during the gas injection period, gas is injected into the liquid-accumulated well by using a gas injection compressor unit. If the induced blowout and discharge occurs during the gas shutdown period or the gas production period, the normal well of the gas storage reservoir is used to introduce the high-pressure gas source of the gas reservoir into the gas injection manifold through the single-well injection-production pipeline of the normal well of the gas storage reservoir. The high-pressure gas source in the gas injection manifold is injected into the gas production tree of the liquid-accumulated well through the first gas injection pipeline, the injection-production pipeline and the second gas injection pipeline of the liquid-accumulated well in sequence. During the discharge, the gas-liquid mixture produced by the gas production tree of the liquid-accumulated well enters the injection-production pipeline of the liquid-accumulated well through the second gas production pipeline of the liquid-accumulated well, and then enters the gas production manifold or the single-well reverse metering pipeline through the first gas production pipeline of the liquid-accumulated well.

2. The gas storage reservoir injection and production well injection and production device according to claim 1, characterized in that: A ground safety valve is provided on the gas production tree pipeline at one end of each gas production tree connected to the corresponding injection and production pipeline; the pressure regulating device provided on each of the second gas production pipelines also includes a low-pressure pressure limiting valve; the device also includes a wellhead control cabinet, and the ground safety valve and the low-pressure pressure limiting valve are both connected to the control cabinet.

3. The gas storage injection and production well injection and production device according to claim 1, characterized in that: The device also includes a reverse metering pipeline, one end of which is connected to each first gas production pipeline through a corresponding reverse metering control valve, and the other end is connected to the inlet of the metering separator; the metering separator is provided with a drain port, and the drain port is connected to the drain pipeline.

4. The gas storage reservoir injection and production well injection and production device according to claim 3, characterized in that: The metering separator is also provided with a first exhaust port and / or a second exhaust port; the first exhaust port is connected to a venting torch; the second exhaust port is connected to a downstream gas production process equipment so that the separated gas enters the downstream gas production process; the metering separator is also provided with a liquid level gauge for monitoring the liquid level in the metering separator to avoid the separator from operating at an over-liquid level.

5. The gas storage injection and production well injection and production device according to claim 1, characterized in that: The injection and production pipeline, the gas production manifold, the gas injection manifold, the first gas production pipeline and the gas tree are all provided with pressure transmitters; the injection and production pipeline, the first gas production pipeline and the gas tree are all provided with temperature transmitters.

6. The gas storage reservoir injection and production well injection and production device according to claim 5, characterized in that: The injection and production pipeline is also provided with an emergency cut-off track ball valve and a single well flow meter; the first gas production pipeline is also provided with a double-acting shut-off valve; the gas injection and boosting equipment is provided with an overpressure reflux pneumatic control valve; the device also includes a vent pipeline, the vent pipeline is connected to the gas injection manifold, and an emergency vent valve is provided on the vent pipeline.

7. A method for inducing liquid discharge based on the injection and production device of a gas storage well according to claim 1, characterized in that: The method of induced spraying and drainage used during the gas stoppage period or gas production period includes the following steps: Step 1: 101) Open the gas production control valve set on the second gas production pipeline on the normal gas well pipeline and adjust the pressure regulating device, introduce the high-pressure gas source of the normal gas well gas tree into the corresponding injection and production pipeline through the second gas production pipeline on the normal gas well pipeline, close the gas production control valve on the corresponding first gas production pipeline, and then open the two-way gas injection control valve on the corresponding first gas injection pipeline, and introduce the high-pressure gas source into the gas injection manifold through the corresponding first gas injection pipeline; 102) Open the two-way gas injection control valve on the first gas injection pipeline on the liquid-filled gas well pipeline, re-introduce the high-pressure gas source obtained from the gas injection manifold into the corresponding first gas injection pipeline, open the gas injection control valve on the corresponding second gas injection pipeline, enter the corresponding second gas injection pipeline through the corresponding injection-production pipeline, and introduce the gas into the liquid-filled gas well from the corresponding second gas injection pipeline; Step 2: Stifle the well; Step 3: 301) close the two-way gas injection control valve on the first gas injection pipeline on the normal gas well pipeline, and close the two-way gas injection control valve on the first gas injection pipeline on the liquid accumulation gas well pipeline, so as to conduct the gas production and injection induction process of the liquid accumulation gas well; 302) The accumulated liquid passes through the second gas production pipeline on the accumulated liquid gas well pipeline and then enters the injection-production station through the corresponding injection-production pipeline to be introduced into the gas-liquid separation equipment for gas-liquid separation; Step 4: Repeat steps 1 to 3 to allow the accumulated fluid to drain completely.

8. The method for inducing spraying and draining liquid according to claim 7, characterized in that: Before step 1, it also includes emergency shutdown system debugging to ensure the normal well shut-in function in an emergency, the real-time monitoring function of the central control, and the compressor shutdown and compressor overpressure reflux and injection and production gas manifold venting functions in overpressure conditions.

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