Multi-working-condition injection-production gas alternation pressurization device and process for gas storage

Abstract

The application discloses a kind of multi-working condition injection-production gas rotation pressurization device and process for gas storage, relating to injection-production gas technology field of gas storage, specifically a kind of multi-working condition injection-production gas rotation pressurization device for gas storage, it carries out injection-production gas rotation pressurization to multiple working conditions of gas storage, including gravity type separator pry, compressor pry, filter separation pry, handover metering pry, injection-production gas trunk line and liaison line pipeline;Mainly using equipment in the whole device is gravity type separator pry, compressor pry, filter separation pry, handover metering pry, under the condition of not investing a large number of equipment costs, by the cooperation installation of injection-production gas trunk line, liaison line pipeline, various pipelines and the above equipment, at the same time, utilize multiple control valves or bypass valves to make natural gas transmission pipeline series connection, to adapt to and satisfy the injection-production gas needs under multiple working conditions of gas storage, reach the purpose of making device satisfy the injection-production gas needs under multiple working conditions of gas storage under low cost condition.

Description

Technical Field

[0001] This invention relates to the field of gas injection and production technology for gas storage facilities, specifically to a multi-condition gas injection and production alternation pressurization device and process for gas storage facilities. Background Technology

[0002] Underground gas storage facilities are artificial gas reservoirs formed by re-injecting natural gas transported through long-distance pipelines into underground spaces. They are characterized by large storage capacity, high mobility, durability, and high safety. The main functions of underground gas storage facilities include peak gas demand regulation and safe gas supply, strategic reserves, improving pipeline utilization to save investment, and reducing transmission costs. Urban gas market demand fluctuates significantly with seasonal and diurnal variations. Relying solely on the gas transmission network system for small-scale flow regulation is insufficient to address the large fluctuations in demand. Underground gas storage facilities can store excess gas in the transmission system during off-peak hours and extract it during peak hours to supplement insufficient pipeline supply, thus solving the peak gas demand regulation problem. In the event of gas source interruption or transmission system shutdown, underground gas storage facilities can serve as a gas source to ensure continuous gas supply, playing a dual role in peak regulation and safe gas supply. The depth range of underground gas storage facilities is generally 250–4000m. The technical parameters for gas injection, extraction, and pressurization in underground gas storage facilities are determined according to the specific requirements of the project. The main components of an underground gas storage facility include the underground gas storage layer, injection and production wells, surface natural gas processing, pressurization, transmission and distribution, metering, and automatic control facilities connected to the gas transmission trunk line, as well as auxiliary facilities such as water supply, power supply, and communication.

[0003] Overseas, high-pressure, large-displacement gas-driven reciprocating piston compressors from well-known brands are typically used, with some motor-driven compressors equipped with speed control mechanisms. Gas injection technology is mature, and key valves and control systems are sourced from reputable manufacturers. Regarding the collection, transportation, and purification of produced gas, depending on the geological type of the gas storage facility, different methods are employed, including low-temperature separation for hydrocarbons and dew point control, and glycol absorption for dehydration. The hydrocarbon and dew point of the exported gas only need to meet the transportation requirements, which are far less stringent than those in China. Major processes and equipment have complete suppliers, and the systems tend towards skid-mounted, integrated, and highly automated control. The injection and production processes have well-defined operating parameters, peak-shaving capabilities, and emergency gas supply planning, resulting in stable operation.

[0004] Because there are few types of gas storage facilities successfully applied in China and their application started late, the main types are condensate gas storage facilities represented by Dagang Oilfield and Jintan cavern gas storage facilities. These facilities typically use electric and gas-driven reciprocating compressors, equipped with imported pressure and flow throttling control methods. The natural gas dehydration hydrocarbon and water dew point control processes use conventional gas field development water injection hydrate inhibitor throttling refrigeration low temperature separation methods, which are complex and energy-intensive. The construction and application of gas storage facilities have not yet formed a series of technologies and complete sets of equipment suppliers, and the overall development and improvement stage is still in the initial stage.

[0005] In recent years, several domestic engineering companies have been conducting research and development on key technologies and equipment for gas storage pressurization, aiming to achieve breakthroughs in pressurization technology and the localization of key equipment. Among published Chinese patent applications, invention patent CN115405485A discloses a gas storage injection compressor unit and control method with automatically adjustable stages, employing a multi-stage compressor with inter-stage switching valves to meet the needs of different pressurization conditions in the gas storage. However, this existing technology can only meet the gas injection conditions of the gas storage and cannot achieve reverse pressurization, etc. For the various operating conditions existing in gas storage, this existing technology cannot effectively adjust according to specific conditions to achieve gas injection and extraction. When existing technologies use other auxiliary equipment to achieve multiple operating conditions in the gas storage injection and extraction process, they require huge equipment costs, resulting in extremely high construction costs.

[0006] In a published Chinese patent application (publication number CN103510922B), titled "An Injection-Production Distribution and Metering Structure for a Gas Storage Facility," a skid-mounted device is used to integrate both the metering manifold assembly and the gas extraction manifold assembly. This allows the large gas extraction and metering pipeline assemblies, which constitute the gas extraction and metering manifold assemblies, to be manufactured in a factory, installed on the skid-mounted device, and then transported to the installation site as a whole. This simplifies the structure, simplifies installation, and reduces construction costs. However, this prior art only addresses the reduction of transportation and installation costs by integrating the metering and gas extraction manifold assemblies onto the skid-mounted device; it does not fundamentally reduce construction costs under various operating conditions of gas storage facilities.

[0007] In summary, in order to solve the problems of existing technologies being unable to adapt to the gas injection and extraction needs of gas storage facilities under various operating conditions, and the problem of increased construction costs caused by meeting the various operating conditions of gas storage facilities, this application is hereby proposed to provide solutions. Summary of the Invention

[0008] (a) Technical problems to be solved

[0009] To address the shortcomings of existing technologies, this invention provides a multi-condition gas injection-production alternation pressurization device and process for gas storage facilities, which solves the problems mentioned in the background art.

[0010] (II) Technical Solution

[0011] To achieve the above objectives, the present invention provides the following technical solution: a multi-condition injection-production gas alternation and pressurization device for gas storage facilities, which performs injection-production gas alternation and pressurization for various operating conditions of the gas storage facility, including a gravity separator skid, a compressor skid, a filter separation skid, a transfer metering skid, injection-production gas trunk pipelines, and connecting pipelines; one end of the connecting pipeline is connected to the gas transmission pipeline to the target market, and the other end of the connecting pipeline is connected to the inlet end of the gravity separator skid and the inlet end of the filter separation skid, respectively. The outlet end of the separator skid is connected to the filter separation skid. The outlet end of the filter separation skid is connected to the inlet end of the compressor skid and the inlet end of the transfer metering skid. The outlet end of the transfer metering skid is connected to the inlet end of the compressor skid and the injection-production gas trunk line. The outlet end of the compressor skid is connected to the injection-production gas trunk line and the inlet end of the transfer metering skid. One end of the injection-production gas trunk line is connected to the inlet end of the gravity separator skid, and the other end of the injection-production gas trunk line is used to connect to the injection-production well site pipeline.

[0012] Optionally, the connecting line pipeline is connected to the inlet end of the gravity separator skid via pipeline seven, the outlet end of the gravity separator skid is connected to the inlet end of the filter separation skid via pipeline eight, the outlet end of the filter separation skid is connected to the inlet end of the transfer metering skid via pipeline five, the outlet end of the transfer metering skid is connected to the inlet end of the compressor skid via pipelines three and nine installed in series, and the outlet end of the compressor skid is connected to the injection and production gas trunk pipeline via pipeline one.

[0013] Optionally, the connecting pipeline is equipped with a connecting line shut-off valve and a gravity separator bypass valve, the pipeline seven is equipped with a second gravity separator inlet control valve and a high and low pressure shut-off valve for injection and production gas, the inlet end of the gravity separator skid is equipped with a first gravity separator inlet control valve, the pipeline eight is equipped with a gravity separator outlet control valve, the pipeline five is equipped with a first transfer metering skid inlet control valve, the pipeline three is equipped with a transfer metering skid outlet control valve, the pipeline nine is equipped with a compressor inlet control valve, the outlet end of the compressor skid is equipped with a compressor outlet control valve, the pipeline one is equipped with a gas injection control valve, and the injection and production gas trunk pipeline is equipped with an injection and production gas trunk shut-off valve.

[0014] Optionally, a second pipe connected to the ninth pipe is installed on the ninth pipe, and the end of the second pipe away from the ninth pipe is connected to the first pipe. A compressor bypass valve is provided on the second pipe.

[0015] Optionally, a pipe four is fixedly installed at the outlet end of the transfer metering skid and connected to it. The end of the pipe four away from the transfer metering skid is connected to the connecting line pipeline. A gas sampling exit control valve and a gas sampling metering post-connecting line control valve are respectively installed at both ends of the pipe four.

[0016] Optionally, the outlet end of the filter separation skid is connected to the inlet end of the compressor skid via pipes 10 and 9 connected in series, and the middle part of pipe 1 is connected to the inlet end of the transfer metering skid via pipe 6; a second transfer metering skid inlet control valve and a gas sampling booster control valve are respectively installed at both ends of pipe 6, and a transfer metering skid bypass valve is installed on pipe 10.

[0017] A multi-condition gas injection and production alternating pressurization process for gas storage facilities includes five sub-processes: initial pressurization injection process, initial self-pressurization injection process, normal production pressurization injection process, normal production gas production process, and final gas production pressurization process. The initial pressurization injection process involves the following steps: gas from the connecting pipeline enters a gravity separator skid via pipeline seven. The natural gas is separated and purified in the gravity separator skid. The separated natural gas then flows through pipeline eight into a filtration separation skid, where it undergoes further separation and purification. After this second purification, the natural gas flows through pipeline five into a metering skid, where it is metered. After metering, the natural gas flows sequentially through pipelines three and nine into a compressor skid, where it is pressurized. The pressurized natural gas then flows through pipeline one into the injection and production gas trunk pipeline, where it is transported under high pressure to the injection and production well site for underground injection.

[0018] Optionally, the self-pressurized gas injection process in the initial stage of gas storage operation is as follows: the metering skid meters the natural gas, and after metering, the natural gas flows sequentially through pipeline 3, pipeline 9, pipeline 2, and pipeline 1 before entering the injection and production gas trunk line. The natural gas is then transported to the injection and production well site and injected underground by its own pressure through the injection and production gas trunk line.

[0019] Optionally, the pressurization and injection process under normal operating conditions of the gas storage facility is as follows: After the gas arrives from the connecting pipeline, it flows into the filter separation skid. The filter separation skid separates and purifies the natural gas. After separation and purification, the natural gas flows through pipeline five into the transfer metering skid. The transfer metering skid meters the natural gas. After metering, the natural gas flows sequentially through pipeline three and pipeline nine into the compressor skid. The compressor skid pressurizes the natural gas. The pressurized natural gas flows through pipeline one into the injection and production gas trunk pipeline. The high-pressure natural gas is then transported to the injection and production well site for injection underground.

[0020] Optionally, the gas extraction process under normal production conditions of the gas storage facility: When the gas storage facility enters the gas extraction period, the natural gas produced by the gas extraction well site enters the gravity separator skid through the injection and extraction trunk pipeline. The gravity separator skid separates and purifies the natural gas. After primary separation, the natural gas enters the filter separation skid through pipeline eight. The filter separation skid performs secondary separation and purification on the natural gas. Subsequently, the natural gas enters the transfer metering skid for metering. After metering, the natural gas flows through pipeline four into the connecting pipeline. Through the connecting pipeline, it enters the target market to meet the peak shaving and emergency gas requirements.

[0021] Gas production boosting process at the end of gas production in gas storage facilities: After the natural gas produced from the gas well site is metered by a single well, it enters the gravity separator skid through the injection and production pipeline for separation and purification. The separated natural gas enters the filter separation skid for further separation and purification. The purified natural gas flows into the compressor skid for boosting. After the boosted natural gas is metered by the transfer metering skid, the natural gas flows sequentially through Pipeline 4 and the connecting pipeline to the target market to meet the gas demand.

[0022] (III) Beneficial Effects

[0023] This invention provides a multi-condition gas injection-production alternation pressurization device and process for gas storage facilities, which has the following beneficial effects:

[0024] 1. This multi-condition gas injection and production alternation booster device for gas storage facilities, through the coordinated arrangement of gravity separator skids, compressor skids, filter separation skids, transfer metering skids, and various pipelines, enables the gas storage facility to perform gas injection and production under five different operating conditions. The main equipment used in the entire device is the gravity separator skid, compressor skid, filter separation skid, and transfer metering skid. Without investing heavily in equipment costs, by coordinating the installation of the main gas injection and production pipelines, connecting pipelines, and various other pipelines with the above-mentioned equipment, and by using multiple control valves or bypass valves to connect the natural gas transmission pipelines in series, it adapts to and meets the gas injection and production needs of the gas storage facility under various operating conditions, achieving the goal of meeting the gas injection and production needs of the gas storage facility under multiple operating conditions at a low cost (including equipment costs).

[0025] 2. This multi-condition gas injection and extraction alternating pressurization device for gas storage has advantages such as fewer equipment, wide adaptability, low energy consumption, localization of key equipment, and modularization of production equipment. It also realizes the application of a combined injection and extraction compressor.

[0026] 3. This is a multi-condition gas injection and production alternation pressurization process for gas storage facilities. It is designed for the initial pressurization and gas injection conditions during the initial operation of a gas storage facility. The pressurization and gas injection process is implemented to achieve pressurization and gas injection during the initial operation of the gas storage facility.

[0027] 4. This is a multi-condition gas injection and production alternation pressurization process for gas storage facilities. It is designed for the initial self-pressurization gas injection condition in the early stage of gas storage facility commissioning. The process achieves self-pressurization gas injection in the early stage of gas storage facility commissioning.

[0028] 5. This is a multi-condition gas injection and production alternation pressurization process for gas storage facilities. It is designed for the normal production pressurization and gas injection conditions of gas storage facilities. By implementing the pressurization and gas injection process for the normal production conditions of gas storage facilities, pressurization and gas injection under normal production conditions can be achieved.

[0029] 6. This is a multi-condition gas injection and production rotation pressurization process for gas storage facilities. It is designed for normal production gas production conditions of gas storage facilities and achieves normal production gas production by implementing the gas production process for normal production conditions of gas storage facilities.

[0030] 7. This is a multi-condition gas injection and production alternation pressurization process for gas storage facilities. It is designed for the gas production pressurization condition at the end of the gas production stage of the gas storage facility. The gas production pressurization process at the end of the gas production stage of the gas storage facility is implemented to achieve gas production pressurization at the end of the gas production stage of the gas storage facility. Attached Figure Description

[0031] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on the provided drawings without creative effort.

[0032] Figure 1 This is a schematic diagram of the overall connection structure of a multi-condition gas injection and production rotation booster device for a gas storage facility according to the present invention.

[0033] Figure 2 This is a flow chart of the gas injection and pressurization process during the initial commissioning of a gas storage facility, which is part of a multi-condition gas injection and production rotation pressurization process for gas storage facilities according to the present invention.

[0034] Figure 3 This is a flow chart of the self-pressurized gas injection process in the initial stage of gas storage commissioning in a multi-condition gas injection and production rotation pressurization process for gas storage facilities according to the present invention.

[0035] Figure 4 This is a process flow diagram of the pressurization and gas injection process under normal production conditions in a gas storage facility, which is part of a multi-condition gas injection and production rotation pressurization process for gas storage facilities according to the present invention.

[0036] Figure 5 This is a process flow diagram of the gas extraction process under normal production conditions in a gas storage facility, which is part of a multi-condition gas injection and extraction rotation pressurization process for gas storage facilities according to the present invention.

[0037] Figure 6This invention provides a process flow diagram of the gas extraction pressurization process at the end of the gas extraction stage in a multi-condition gas injection and extraction rotation pressurization process for gas storage facilities.

[0038] In the diagram: 1. Gas injection / production trunk line shut-off valve; 2. Gas production booster control valve; 3. Gas injection control valve; 4. Gas injection / production high and low pressure shut-off valves; 5. First gravity separator inlet control valve; 6. Gravity separator skid; 7. Compressor inlet control valve; 8. Compressor skid; 9. Compressor outlet control valve; 10. Connecting line shut-off valve; 11. Gas production metering and connecting line control valve; 12. Second gravity separator inlet control valve; 13. Gravity separator bypass valve; 14. Gravity separator outlet control valve; 15. Filter separation skid; 6. Bypass valve for metering transfer skid; 17. Inlet control valve for first metering transfer skid; 18. Inlet control valve for second metering transfer skid; 19. Compressor bypass valve; 20. Metering transfer skid; 21. Outlet metering transfer skid control valve; 22. Outlet metering transfer skid control valve for gas production; 23. Injection and production gas trunk pipeline; 24. Connecting pipeline; 25. Pipeline 1; 26. Pipeline 2; 27. Pipeline 3; 28. Pipeline 4; 29. ​​Pipeline 5; 30. Pipeline 6; 31. Pipeline 7; 32. Pipeline 8; 33. Pipeline 9; 34. Pipeline 10. Detailed Implementation

[0039] The technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present invention. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments.

[0040] Example 1

[0041] Please see Figures 1 to 2 This invention provides a technical solution: a multi-condition injection-production gas alternation pressurization device for gas storage facilities, which performs injection-production gas alternation pressurization for various operating conditions of the gas storage facility. It includes a gravity separator skid 6, a compressor skid 8, a filter separation skid 15, a transfer metering skid 20, an injection-production gas trunk line 23, and a connecting line line 24. One end of the connecting line line 24 is connected to the gas transmission pipeline to the target market. The other end of the connecting line line 24 is connected to the inlet end of the gravity separator skid 6 and the inlet end of the filter separation skid 15. The outlet end of the gravity separator skid 6 is connected to the filter separation skid 15. The outlet end of the filter separation skid 15 is connected to the inlet end of the compressor skid 8 and the inlet end of the transfer metering skid 20. The outlet end of the transfer metering skid 20 is connected to the inlet end of the compressor skid 8 and the injection-production gas trunk line 23. The outlet end of the compressor skid 8 is connected to the injection-production gas trunk line 23 and the inlet end of the transfer metering skid 20. One end of the injection-production gas trunk line 23 is connected to the inlet end of the gravity separator skid 6, and the other end of the injection-production gas trunk line 23 is used to connect to the injection-production well site pipeline.

[0042] The entire device mainly uses gravity separator skid 6, compressor skid 8, filter separation skid 15, and transfer metering skid 20, through the coordinated installation of gravity separator skid 6, compressor skid 8, filter separation skid 15, and transfer metering skid 20. Without investing a large amount of equipment costs, by cooperating with the above-mentioned equipment to install the injection and production gas trunk pipeline 23 and connecting pipeline 24, it can adapt to and meet the injection and production gas needs of the gas storage facility under various operating conditions, thus achieving the goal of meeting the injection and production gas needs of the gas storage facility under various operating conditions with low equipment costs.

[0043] Specifically, the connecting line pipeline 24 is connected to the inlet end of the gravity separator skid 6 via pipeline 7 31, the outlet end of the gravity separator skid 6 is connected to the inlet end of the filter separation skid 15 via pipeline 8 32, the outlet end of the filter separation skid 15 is connected to the inlet end of the transfer metering skid 20 via pipeline 5 29, the outlet end of the transfer metering skid 20 is connected to the inlet end of the compressor skid 8 via pipeline 3 27 and pipeline 9 33 installed in series, and the outlet end of the compressor skid 8 is connected to the injection and production gas trunk line 23 via pipeline 1 25.

[0044] A connecting line shut-off valve 10 and a gravity separator bypass valve 13 are respectively installed on the connecting line pipeline 24. A second gravity separator inlet control valve 12 and a high and low pressure shut-off valve 4 for injection and production gas are respectively installed on the pipeline 7 31. A first gravity separator inlet control valve 5 is installed at the inlet end of the gravity separator skid 6. A gravity separator outlet control valve 14 is installed on the pipeline 8 32. A first transfer metering skid inlet control valve 17 is installed on the pipeline 5 29. A transfer metering skid outlet control valve 21 is installed on the pipeline 3 27. A compressor inlet control valve 7 is installed on the pipeline 9 33. A compressor outlet control valve 9 is installed at the outlet end of the compressor skid 8. An injection control valve 3 is installed on the pipeline 1 25. An injection and production gas trunk line shut-off valve 1 is installed on the injection and production gas trunk line 23.

[0045] The system consists of a connecting line 24, a gravity separator skid 6, a filter separation skid 15, a transfer metering skid 20, a compressor skid 8, and an injection / production gas trunk line 23 connected in series via various pipelines. These pipelines form a natural gas pressurization and injection pipeline designed to meet the initial pressurization and injection requirements of the gas storage facility. During operation, the following valves are opened sequentially: connecting line shut-off valve 10, gravity separator bypass valve 13, second gravity separator inlet control valve 12, high and low pressure injection / production gas shut-off valve 4, first gravity separator inlet control valve 5, gravity separator outlet control valve 14, first transfer metering skid inlet control valve 17, transfer metering skid outlet control valve 21, compressor inlet control valve 7, compressor outlet control valve 9, injection control valve 3, and injection / production gas trunk line shut-off valve 1. This connects the entire natural gas pressurization and injection pipeline. (Note: During the initial pressurization and injection phase of the gas storage facility, all other valves in the system are closed.)

[0046] The pressurization and injection process during the initial commissioning of the gas storage facility is applicable to this embodiment. To prevent water retention in the pipelines from affecting the compressor during the initial commissioning, a two-stage separation process is required. Gas arrives at the connecting pipeline 24 and enters the gravity separator skid 6 via pipeline 7 31. The natural gas undergoes separation and purification at the gravity separator skid 6. The separated natural gas then flows through pipeline 8 32 to the filter separation skid 15, where it undergoes further separation and purification. After this second purification, the natural gas flows through pipeline 5 29 to the transfer metering skid 20, where it is metered. After metering, the natural gas flows sequentially through pipeline 3 27 and pipeline 9 33 into the compressor skid 8. The compressor skid 8 pressurizes the natural gas, which then flows through pipeline 1 25 into the injection-production gas trunk pipeline 23, where it is transported under high pressure to the injection-production well site for underground injection.

[0047] Example 2

[0048] Please see Figure 3 The difference between this embodiment and embodiment one is that: pipe two 26 is installed on pipe nine 33 and is connected to it. The end of pipe two 26 away from pipe nine 33 is connected to pipe one 25. A compressor bypass valve 19 is provided on pipe two 26.

[0049] The system consists of a connecting line 24, a gravity separator skid 6, a filter separation skid 15, a transfer metering skid 20, and an injection / production gas trunk line 23 connected in series via various pipelines. These pipelines form a natural gas self-pressurized injection pipeline designed to meet the self-pressurized injection requirements during the initial operation of the gas storage facility. During operation, the following valves are opened sequentially: connecting line shut-off valve 10, gravity separator bypass valve 13, second gravity separator inlet control valve 12, injection / production gas high / low pressure shut-off valve 4, first gravity separator inlet control valve 5, gravity separator outlet control valve 14, first transfer metering skid inlet control valve 17, transfer metering skid outlet control valve 21, compressor bypass valve 19 (compressor inlet control valve 7 and compressor outlet control valve 9 are closed), injection control valve 3, and injection / production gas trunk line shut-off valve 1. This connects the entire natural gas self-pressurized injection pipeline. (Note: During the initial pressurized injection phase of the gas storage facility, other valves in the system are closed.)

[0050] The self-pressurized gas injection process during the initial operation of the gas storage facility is applicable to this embodiment. Specifically, when the gas source pressure is greater than the inlet pressure of the injection and production well sites and the injection channels are unobstructed during the initial operation of the gas storage facility, gas arrives through the connecting pipeline 24 and enters the gravity separator skid 6 via pipeline 7 31. The natural gas undergoes separation and purification in the gravity separator skid 6. The separated natural gas then flows through pipeline 8 32 into the filter separation skid 15, where it undergoes further separation and purification. After this second purification, the natural gas flows through pipeline 5 29 into the transfer metering skid 20, where it is metered. After metering, the natural gas flows sequentially through pipeline 3 27, pipeline 9 33, pipeline 2 26, and pipeline 1 25 before entering the injection and production gas trunk pipeline 23. The natural gas, relying on its own pressure, is transported through the injection and production gas trunk pipeline 23 to the injection and production well sites for underground injection.

[0051] Example 3

[0052] Please see Figure 4 The difference between this embodiment and embodiment one is that: one end of the connecting line pipeline 24 is connected to the inlet end of the filter separation skid 15; the outlet end of the filter separation skid 15 is connected to the inlet end of the transfer metering skid 20 through pipeline five 29; the outlet end of the transfer metering skid 20 is connected to the inlet end of the compressor skid 8 through pipeline three 27 and pipeline nine 33 installed in series; and the outlet end of the compressor skid 8 is connected to the injection and production gas trunk line 23 through pipeline one 25.

[0053] The pipeline system consists of a connecting line 24, a filter separation skid 15, a transfer metering skid 20, a compressor skid 8, and an injection / production gas trunk line 23 connected in series to form a natural gas pressurization and injection pipeline suitable for normal production and pressurization conditions in the gas storage facility. During operation, the connecting line shut-off valve 10, the gravity separator bypass valve 13 (note that under normal production and pressurization conditions in the gas storage facility, the second gravity separator inlet control valve 12, the injection / production gas high and low pressure shut-off valves 4, the first gravity separator inlet control valve 5, the gravity separator outlet control valve 14, and other valves in the system are closed), the first transfer metering skid inlet control valve 17, the transfer metering skid outlet control valve 21, the compressor inlet control valve 7, the compressor outlet control valve 9, the injection control valve 3, and the injection / production gas trunk line shut-off valve 1 are opened sequentially to connect the entire natural gas pressurization and injection pipeline.

[0054] The pressurization and injection process under normal operating conditions of the gas storage facility is applicable to this embodiment. After several injection and production cycles, when the residual impurities in the pipeline are low, gas enters the filter separation skid 15 after arriving at the connecting pipeline 24. The filter separation skid 15 separates and purifies the natural gas. After separation and purification, the natural gas flows through pipeline 5 29 into the transfer metering skid 20. The transfer metering skid 20 meters the natural gas. After metering, the natural gas flows sequentially through pipeline 3 27 and pipeline 9 33 into the compressor skid 8. The compressor skid 8 pressurizes the natural gas. The pressurized natural gas flows through pipeline 1 25 into the injection and production gas trunk pipeline 23, and is then transported under high pressure to the injection and production well site for injection underground.

[0055] Example 4

[0056] Please see Figure 5 The difference between this embodiment and embodiment one is that: the outlet end of the transfer metering skid 20 is fixedly installed with a pipe 28 connected to it, and the end of the pipe 28 away from the transfer metering skid 20 is connected to the connecting line pipeline 24; the two ends of the pipe 28 are respectively provided with a gas sampling outlet transfer metering skid control valve 22 and a gas sampling metering outlet connecting line control valve 11.

[0057] The gas injection and production trunk line 23, gravity separator skid 6, filter separation skid 15, transfer metering skid 20, and connecting line line 24 are connected in series through various pipelines to form a normal natural gas production pipeline that meets the needs of normal production and production conditions of the gas storage facility. In use, the following valves are opened sequentially: injection and production trunk line shut-off valve 1, first gravity separator inlet control valve 5, gravity separator outlet control valve 14, first transfer metering skid inlet control valve 17, production gas outlet transfer metering skid control valve 22, production gas metering post-connecting line control valve 11, and connecting line shut-off valve 10, thereby connecting the entire normal natural gas production pipeline (Note: Under normal production and production conditions of the gas storage facility, other valve systems are closed).

[0058] The gas extraction process under normal operating conditions of the gas storage facility is applicable to this embodiment. Specifically, when the gas storage facility enters the gas extraction period, the natural gas produced from the extraction well site enters the gravity separator skid 6 via the injection-production main pipeline 23. The gravity separator skid 6 separates and purifies the natural gas. After primary separation, the natural gas enters the filter separation skid 15 via pipeline 32. The filter separation skid 15 performs secondary separation and purification on the natural gas. Subsequently, the natural gas enters the transfer metering skid 20 for metering. After metering, the natural gas flows through pipeline 28 into the connecting pipeline 24, and then enters the target market through the connecting pipeline 24 to meet peak-shaving and emergency gas requirements.

[0059] Example 5

[0060] Please see Figure 6The difference between this embodiment and embodiment one is that: the outlet end of the filter separation skid 15 is connected to the inlet end of the compressor skid 8 through the interconnected pipes 10 34 and 9 33 in sequence; the middle part of pipe 1 25 is connected to the inlet end of the transfer metering skid 20 through pipe 6 30; the two ends of pipe 6 30 are respectively provided with a second transfer metering skid inlet control valve 18 and a gas sampling booster control valve 2; and a transfer metering skid bypass valve 16 is provided on pipe 10 34.

[0061] The system consists of a main gas injection / production pipeline 23, a gravity separator skid 6, a filter separation skid 15, a compressor skid 8, a metering transfer skid 20, and a connecting line pipeline 24 connected in series to form the gas storage facility's final gas production pipeline, designed to meet the needs of pressurization during the final gas production stage. During operation, the following valves are opened sequentially: main gas injection / production pipeline shut-off valve 1, first gravity separator inlet control valve 5, gravity separator outlet control valve 14, metering transfer skid bypass valve 16, compressor inlet control valve 7, compressor outlet control valve 9, gas production pressurization control valve 2, second metering transfer skid inlet control valve 18, gas production outlet metering transfer skid control valve 22, metered gas production to connecting line control valve 11, and connecting line shut-off valve 10. This connects the entire gas storage facility's final gas production pipeline. (Note: During the final gas production pressurization stage, all other valves are closed.)

[0062] The gas production boosting process at the end of the gas production phase in this embodiment is applicable. Specifically, when the gas storage facility enters the final stage of gas production and the wellhead pressure cannot meet the external transmission requirements of the connecting line, the natural gas produced at the production well site, after being metered by the single well, enters the gravity separator skid 6 through the injection-production main pipeline 23 for separation and purification. The separated natural gas then enters the filter separation skid 15 for further separation and purification. The purified natural gas flows into the compressor skid 8 for boosting. After being metered by the transfer metering skid 20, the boosted natural gas flows sequentially through pipeline 28 and the connecting line pipeline 24 to reach the target market and meet the gas consumption requirements.

[0063] The above description is only a preferred embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any equivalent substitutions or modifications made by those skilled in the art within the scope of the technology disclosed in the present invention, based on the technical solution and inventive concept of the present invention, should be covered within the scope of protection of the present invention.

Claims

1. A multi-condition injection-production gas alternation and pressurization device for a gas storage facility, characterized in that: The system includes a gravity separator skid (6), a compressor skid (8), a filter separation skid (15), a metering skid (20), an injection-production gas trunk line (23), and a connecting line line (24). One end of the connecting line line (24) is connected to the gas transmission pipeline to the target market, and the other end of the connecting line line (24) is connected to the inlet end of the gravity separator skid (6) and the inlet end of the filter separation skid (15), respectively. The outlet end of the gravity separator skid (6) is connected to the filter separation skid (15), and the outlet end of the filter separation skid (15) is connected to the filter separation skid (15). The outlet end is connected to the inlet end of the compressor skid (8) and the inlet end of the transfer metering skid (20), respectively. The outlet end of the transfer metering skid (20) is connected to the inlet end of the compressor skid (8) and the injection-production gas trunk line (23), respectively. The outlet end of the compressor skid (8) is connected to the injection-production gas trunk line (23) and the inlet end of the transfer metering skid (20), respectively. One end of the injection-production gas trunk line (23) is connected to the inlet end of the gravity separator skid (6), and the other end of the injection-production gas trunk line (23) is used to connect to the injection-production well site pipeline.

2. The multi-condition gas injection-production alternation pressurization device for a gas storage facility according to claim 1, characterized in that: The connecting line pipeline (24) is connected to the inlet end of the gravity separator skid (6) through pipeline seven (31). The outlet end of the gravity separator skid (6) is connected to the inlet end of the filter separation skid (15) through pipeline eight (32). The outlet end of the filter separation skid (15) is connected to the inlet end of the transfer metering skid (20) through pipeline five (29). The outlet end of the transfer metering skid (20) is connected to the inlet end of the compressor skid (8) through pipeline three (27) and pipeline nine (33) installed in series. The outlet end of the compressor skid (8) is connected to the injection and production gas trunk line (23) through pipeline one (25).

3. A multi-condition gas injection-production alternation pressurization device for a gas storage facility according to claim 2, characterized in that: The connecting line pipeline (24) is equipped with a connecting line shut-off valve (10) and a gravity separator bypass valve (13). The pipeline seven (31) is equipped with a second gravity separator inlet control valve (12) and a high and low pressure shut-off valve (4) for injection and production gas. The gravity separator skid (6) is equipped with a first gravity separator inlet control valve (5). The pipeline eight (32) is equipped with a gravity separator outlet control valve (14). The pipeline five (29) is equipped with a first transfer metering skid inlet control valve (17), the third pipeline (27) is equipped with an outlet transfer metering skid control valve (21), the ninth pipeline (33) is equipped with a compressor inlet control valve (7), the outlet end of the compressor skid (8) is equipped with a compressor outlet control valve (9), the first pipeline (25) is equipped with a gas injection control valve (3), and the gas injection and extraction trunk line (23) is equipped with a gas injection and extraction trunk line cutoff valve (1).

4. A multi-condition gas injection-production alternation pressurization device for a gas storage facility according to claim 2, characterized in that: Pipeline 2 (26) is installed on pipe 9 (33) and is connected to it. The end of pipe 2 (26) away from pipe 9 (33) is connected to pipe 1 (25). A compressor bypass valve (19) is provided on pipe 2 (26).

5. A multi-condition gas injection-production alternation pressurization device for a gas storage facility according to claim 2, characterized in that: The outlet end of the transfer metering skid (20) is fixedly installed with a pipe four (28) connected to it. The end of the pipe four (28) away from the transfer metering skid (20) is connected to the connecting line pipeline (24). The two ends of the pipe four (28) are respectively provided with a gas sampling exit transfer metering skid control valve (22) and a gas sampling metering exit connecting line control valve (11).

6. A multi-condition gas injection-production alternation pressurization device for a gas storage facility according to claim 5, characterized in that: The outlet end of the filter separation skid (15) is connected to the inlet end of the compressor skid (8) via the interconnected pipes 10 (34) and 9 (33). The middle part of the pipe 1 (25) is connected to the inlet end of the transfer metering skid (20) via the pipe 6 (30). The two ends of the pipe 6 (30) are respectively provided with a second transfer metering skid inlet control valve (18) and a gas sampling booster control valve (2). The pipe 10 (34) is provided with a transfer metering skid bypass valve (16).

7. A multi-condition injection-production gas alternation pressurization process for a gas storage facility, applicable to the multi-condition injection-production gas alternation pressurization device for a gas storage facility as described in any one of claims 1 to 6, characterized in that, It includes five sub-processes, namely, the initial pressurization and gas injection process for the gas storage facility, the initial self-pressurization and gas injection process for the gas storage facility, the pressurization and gas injection process for the gas storage facility under normal production conditions, the gas extraction process for the gas storage facility under normal production conditions, and the pressurization process for the gas extraction process at the end of the gas extraction period. The initial pressurization and gas injection process for the gas storage facility: After the gas arrives from the connecting pipeline (24), it enters the gravity separator skid (6) through pipeline seven (31). The natural gas enters the gravity separator skid (6) for separation and purification. The separated natural gas flows through pipeline eight (32) into the filter. The separation skid (15) separates and purifies the natural gas again. After being separated and purified again, the natural gas flows through pipeline five (29) into the transfer metering skid (20). The transfer metering skid (20) meters the natural gas. After being metered, the natural gas flows through pipeline three (27) and pipeline nine (33) into the compressor skid (8). The compressor skid (8) pressurizes the natural gas. The pressurized natural gas flows through pipeline one (25) into the injection and production gas trunk line (23). The high-pressure natural gas is transported to the injection and production well site and injected underground.

8. The multi-condition gas injection-production alternation pressurization process for a gas storage facility according to claim 7, characterized in that, In the initial stage of gas storage operation, the self-pressurized gas injection process is as follows: the metering skid (20) measures the natural gas. After metering, the natural gas flows sequentially through pipeline three (27), pipeline nine (33), pipeline two (26), and pipeline one (25) before entering the injection and production gas trunk line (23). The natural gas is then transported to the injection and production well site and injected underground by relying on its own pressure through the injection and production gas trunk line (23).

9. A multi-condition gas injection-production alternation pressurization process for a gas storage facility according to claim 7, characterized in that, Gas injection process under normal operating conditions of gas storage facility: After gas arrives from the connecting pipeline (24), it flows into the filter separation skid (15). The filter separation skid (15) separates and purifies the natural gas. After separation and purification, the natural gas flows through pipeline five (29) into the transfer metering skid (20). The transfer metering skid (20) meters the natural gas. After metering, the natural gas flows through pipeline three (27) and pipeline nine (33) into the compressor skid (8). The compressor skid (8) pressurizes the natural gas. The pressurized natural gas flows through pipeline one (25) into the injection and production gas trunk pipeline (23). The high-pressure natural gas is transported to the injection and production well site and injected underground.

10. A multi-condition gas injection-production alternation pressurization process for a gas storage facility according to claim 7, characterized in that, Gas extraction process under normal operating conditions of the gas storage facility: When the gas storage facility enters the gas extraction period, the natural gas produced by the gas extraction well site enters the gravity separator skid (6) through the injection and extraction main pipeline (23). The gravity separator skid (6) separates and purifies the natural gas. After primary separation, the natural gas enters the filter separation skid (15) through pipeline eight (32). The filter separation skid (15) performs secondary separation and purification on the natural gas. After that, the natural gas enters the transfer metering skid (20) for metering. After metering, the natural gas flows through pipeline four (28) into the connecting pipeline (24). 4) Entering the target market to meet peak shaving and emergency gas requirements; Gas storage gas production end-stage gas production pressurization process: The natural gas produced by the gas production well site is metered by a single well and enters the gravity separator skid (6) through the injection and production gas trunk pipeline (23) for separation and purification. The separated natural gas enters the filter separation skid (15) for further separation and purification. The purified natural gas flows into the compressor skid (8) for pressurization. After the pressurized natural gas is metered by the transfer metering skid (20), the natural gas flows sequentially through pipeline four (28) and the connecting line pipeline (24) to enter the target market to meet gas requirements.

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