A multi-gas source multi-user injection-production gas switching metering device and process for gas storage

Abstract

The application discloses a kind of multi-gas source multi-user injection-production gas switching metering devices and processes for gas storage, and relates to the technical field of gas storage injection-production gas equipment, specifically to a kind of multi-gas source multi-user injection-production gas switching metering devices for gas storage, including gas field gas pipeline, low-pressure pipeline, injection-production gas pipeline, high-pressure pipeline, first gas recovery processing pipeline, second gas recovery processing pipeline;One end of the gas field gas pipeline is used to communicate with gas field, and the other end of the gas field gas pipeline communicates with the second gas recovery processing pipeline;The application provides a kind of multi-gas source multi-user injection-production gas switching metering devices and processes for gas storage, which is applied in gas storage, can realize the free switching measurement and interconnection of multiple gas sources and users in different injection-production cycles of gas storage, and realizes the standardization, serialization, integration, modularization and skid-mounted of the device, which can effectively reduce the construction period and construction cost.

Description

Technical Field

[0001] This invention relates to the field of gas injection and extraction equipment technology for gas storage facilities, specifically to a multi-source, multi-user gas injection and extraction switching metering device and process for gas storage facilities. Background Technology

[0002] Underground gas storage facilities are the main method of natural gas storage, playing four major roles: seasonal peak shaving, emergency supply, strategic reserves, and market regulation.

[0003] The existing gas storage facilities in China are basically operated with a single connecting line and a single injection and production trunk line. They cannot achieve free switching and interconnection between multiple gas sources and multiple users within the gas collection and injection station. Furthermore, the integration, modularization, and skid-mounted nature of the gas storage facilities built in the early stages are relatively low.

[0004] Utility model patent CN204647856U discloses a multi-user natural gas storage peak shaving simulation device, which mainly includes a gas storage tank area, metering instruments, regulating devices, process pipelines and SCADA control system. The research results of these two patents are mostly used for the joint peak shaving method of multiple users in gas transmission stations, and are not applicable to the gas source switching of gas storage facilities.

[0005] In a published Chinese patent application, titled "A Multi-Source Gas Supply System and its Gas Supply Method," publication number CN108533964A, this invention provides a multi-source gas supply method. The monitoring platform, through real-time monitoring of global sensors, promptly acquires data, handles early warnings and faults, and intelligently and automatically activates the corresponding gas supply mode based on different early warning and fault modes. This achieves systematic, automated, and intelligent adjustment of the gas supply channels and volume, particularly improving gas supply efficiency during peak consumption periods. It also enhances safety early warning capabilities, ensuring people's gas usage needs are met. This application, by connecting a monitoring platform in addition to the industrial control computer, reduces the power consumption of the industrial control computer, improves the processing and analysis speed of monitoring data, and enhances the timeliness of response and human-computer interaction. However, this prior art focuses on using intelligent equipment systems to adjust the gas supply channels, thereby improving gas supply efficiency during peak consumption periods. It cannot achieve free switching and interconnection between multiple gas sources and multiple users within the gas injection station.

[0006] In summary, the existing technologies have the following problems: gas storage facilities cannot achieve free switching and interconnection between multiple gas sources and multiple users within the gas injection station, and the integration, modularization, and skid-mounting of previously constructed gas storage facilities are relatively low. To address these problems, this application is proposed. Summary of the Invention

[0007] (a) Technical problems to be solved

[0008] To address the shortcomings of existing technologies, this invention provides a multi-source, multi-user gas injection and extraction switching metering device and process for gas storage facilities, solving the problems mentioned in the background section.

[0009] (II) Technical Solution

[0010] To achieve the above objectives, the present invention provides the following technical solution: a multi-source, multi-user injection-production gas switching metering device for gas storage facilities, used for injection-production gas switching metering under various operating conditions in the gas storage facility, comprising a gas field inlet pipeline, a low-pressure pipeline, an injection-production gas pipeline, a high- and medium-pressure pipeline, a first production gas processing pipeline, a second production gas processing pipeline, a first booster pipeline, and a second booster pipeline; one end of the gas field inlet pipeline is connected to the gas field, and the other end of the gas field inlet pipeline is connected to the second production gas processing pipeline; one end of the low-pressure pipeline is connected to a low-pressure connecting line, and the other end of the low-pressure pipeline is equipped with a low-pressure transfer metering skid; the middle part of the low-pressure pipeline is connected to the first production gas processing pipeline. The low-pressure transfer metering skid has one outlet end connected to the second pressurization pipeline via pipe three; one end of the injection-production gas pipeline is connected to the injection-production gas trunk line, and the other end of the injection-production gas pipeline is connected to the second production gas processing pipeline; the outlet end of the first pressurization pipeline is connected to the end of the second production gas processing pipeline near the injection-production gas pipeline; one end of the high- and medium-pressure pipeline is connected to the high- and medium-pressure connecting line, and the other end of the high- and medium-pressure pipeline is equipped with a high- and medium-pressure transfer metering skid; the high- and medium-pressure pipeline is connected to the second pressurization pipeline via pipe six, and pipe six is ​​equipped with a sixteenth control valve and a twenty-first control valve; one outlet end of the high- and medium-pressure transfer metering skid is connected to the second pressurization pipeline.

[0011] Optionally, a fourth pipe connected to the gas pipeline from the gas field is installed on the gas pipeline from the gas field. The end of the fourth pipe that is away from the gas pipeline from the gas field is connected to the second pressurization pipeline. A tenth control valve is installed on the fourth pipe.

[0012] Optionally, the middle section of the low-pressure pipeline is connected to the gas field's gas pipeline via a first pipeline, and a second control valve is installed on the first pipeline; the other outlet end of the low-pressure transfer metering skid is connected to the middle section of the low-pressure pipeline via a second pipeline, and an eighth control valve and a first control valve are installed on the second pipeline respectively.

[0013] Optionally, the first gas extraction and processing pipeline is connected to pipeline six, and the other outlet end of the high- and medium-pressure transfer metering skid is connected to the high- and medium-pressure pipeline through pipeline eight. Pipeline eight is equipped with a twentieth control valve and a thirteenth control valve. The second pressurization pipeline is connected to the second gas extraction and processing pipeline through pipeline five. Pipeline five is equipped with an eleventh control valve. The first pressurization pipeline is connected to the other inlet end of the high- and medium-pressure transfer metering skid through pipeline seven. Pipeline seven is equipped with a twenty-second control valve and an eighteenth control valve.

[0014] Optionally, the gas field inlet pipeline, low-pressure pipeline, injection-production pipeline, and high- and medium-pressure pipeline are all equipped with cleaning valves and shut-off valves; the gas field inlet pipeline is equipped with a fourth control valve and a ninth control valve; the low-pressure pipeline is equipped with a third control valve and a sixth control valve; the first gas production and processing pipeline is equipped with a fifth control valve; the pipeline is equipped with a seventh control valve; the second gas production and processing pipeline is equipped with a fourteenth control valve; the first booster pipeline is equipped with a twelfth control valve; the high- and medium-pressure pipelines are equipped with a fifteenth control valve and a seventeenth control valve; and the second booster pipeline is equipped with a nineteenth control valve.

[0015] A multi-source, multi-user injection-production gas switching metering process for gas storage facilities, applicable to the aforementioned multi-source, multi-user injection-production gas switching metering device for gas storage facilities, is characterized by comprising five sub-processes: gas field inlet gas processing process for different injection-production stages, self-pressurized gas injection process in the initial stage of injection, pressurized gas injection process for different gas sources, gas production processing process for different users, and pressurized external transmission process in the final stage of gas production; gas field inlet gas processing process for different injection-production stages: natural gas flows from the gas field into the gas field inlet gas pipeline, and the natural gas in the gas field inlet gas pipeline enters the injection-production gas processing system through the second gas production processing pipeline, or enters the skid-mounted compressor through pipeline four and the second pressurized pipeline, or enters the low-pressure connecting line through pipeline one and the low-pressure pipeline.

[0016] Optionally, the initial self-pressurized gas injection process: the gas from the high- and medium-pressure interconnection line flows sequentially through the high- and medium-pressure pipeline, the high- and medium-pressure junction metering skid, pipeline five, and the injection and production gas pipeline, and is then injected into the underground gas storage through the injection and production gas trunk line. The high- and medium-pressure junction metering skid measures the flow rate of natural gas transported by the high- and medium-pressure interconnection line.

[0017] Optionally, different gas source boosting and injection processes include low-pressure interconnection line gas metering boosting and injection process and high- and medium-pressure interconnection line gas metering boosting and injection process; Low-pressure interconnection line gas metering boosting and injection process: Gas from the low-pressure interconnection line passes sequentially through the low-pressure pipeline, low-pressure transfer metering skid, pipeline three, and the second boosting pipeline before entering the skid-mounted compressor. The skid-mounted compressor boosts the natural gas, and the boosted natural gas passes sequentially through the first boosting pipeline, the injection-production gas pipeline, and then through the injection-production gas trunk line into the underground gas storage; High- and medium-pressure interconnection line gas metering boosting and injection process: Gas from the high- and medium-pressure interconnection line passes sequentially through the high- and medium-pressure pipeline, the high- and medium-pressure transfer metering skid, and the second boosting pipeline before entering the skid-mounted compressor. The skid-mounted compressor boosts the natural gas, and the boosted natural gas passes sequentially through the first boosting pipeline, the injection-production gas pipeline, and then through the injection-production gas trunk line into the underground gas storage.

[0018] Optionally, different gas extraction and processing processes for different users include the initial gas extraction process of entering the medium-high pressure interconnection line for external transmission and the later gas extraction process of entering the low-pressure interconnection line for external transmission. The initial gas extraction process of entering the medium-high pressure interconnection line for external transmission involves the following: gas from the injection-production gas main line passes sequentially through the injection-production gas pipeline, the second gas extraction and processing pipeline, the injection-production gas processing system, the first gas extraction and processing pipeline, pipeline six, the high-pressure / medium-pressure pipeline, the high-pressure / medium-pressure junction metering skid, pipeline eight, and the high-pressure / medium-pressure pipeline before entering the high-pressure / medium-pressure interconnection line, and then being delivered to the target customer via the high-pressure / medium-pressure interconnection line. The later gas extraction process of entering the low-pressure interconnection line for external transmission involves the following: gas from the injection-production gas main line passes sequentially through the injection-production gas pipeline, the second gas extraction and processing pipeline, the injection-production gas processing system, the first gas extraction and processing pipeline, the low-pressure pipeline, the low-pressure junction metering skid, pipeline two, and the low-pressure pipeline before entering the low-pressure interconnection line, and then being delivered to the target user via the low-pressure interconnection line.

[0019] Optionally, the gas production end-stage pressurization and external transmission process includes the gas production end-stage pressurization and external transmission process via the medium-high pressure connection line and the gas field gas pressurization and external transmission process via the medium-high pressure connection line. The gas production end-stage pressurization and external transmission process via the medium-high pressure connection line involves the following: gas from the injection-production gas main line sequentially passes through the injection-production gas pipeline, the second production gas processing pipeline, the injection-production gas processing system, the first production gas processing pipeline, pipeline six, the second pressurization pipeline, the skid-mounted compressor, the first pressurization pipeline, pipeline seven, the high- and medium-pressure metering skid, pipeline eight, and the high- and medium-pressure pipeline before entering the high- and medium-pressure connection line, and then being transmitted to the target customer via the high- and medium-pressure connection line. The gas field gas pressurization and external transmission process via the medium- and high-pressure connection line involves the following: gas from the gas field sequentially passes through the gas field gas pipeline, the second production gas processing pipeline, the injection-production gas processing system, the first production gas processing pipeline, pipeline six, the second pressurization pipeline, the skid-mounted compressor, the first pressurization pipeline, pipeline seven, the high- and medium-pressure metering skid, pipeline eight, and the high- and medium-pressure pipeline before entering the high- and medium-pressure connection line.

[0020] (III) Beneficial Effects

[0021] This invention provides a multi-source, multi-user gas injection and extraction switching metering device and process for gas storage facilities, which has the following beneficial effects:

[0022] 1. This invention provides a multi-gas-source, multi-user gas injection and extraction switching metering device and process for gas storage facilities. When applied in gas storage facilities, this device enables free switching and interconnection of multiple gas sources and users in different injection and extraction cycles. It also achieves standardization, serialization, integration, modularization, and skid-mounting of the device, which can effectively reduce the engineering construction period and reduce engineering construction costs.

[0023] 2. This invention provides a multi-source, multi-user gas injection and production switching metering device and process for gas storage facilities. This device can realize five operating conditions: gas field inlet metering and processing at different injection and production stages; gas inlet metering and self-pressurized injection at the initial injection stage; gas inlet metering and pressurized injection from different gas sources; gas production processing, metering, and external transmission from different users; and gas production pressurization and metering external transmission at the end of the production stage. These five operating conditions of the gas storage facility can be switched freely through various control valves within the device to meet the production requirements of the gas storage facility at different stages. Compared with existing gas storage facility production equipment, this device has a simpler process, is easier to operate, and achieves standardization, serialization, integration, modularization, and skid-mounting, effectively reducing the construction period and costs. Attached Figure Description

[0024] 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.

[0025] Figure 1 This is a schematic diagram of the pipeline connection structure in a multi-gas-source, multi-user gas injection-production switching metering device for a gas storage facility according to the present invention.

[0026] Figure 2 This invention provides a process flow diagram of gas field inflow treatment at different injection and production stages in a multi-source, multi-user gas injection and production switching metering process for gas storage facilities.

[0027] Figure 3 This invention provides a flow chart of the initial self-pressure gas injection process in a multi-source, multi-user gas injection and metering switching process for gas storage facilities.

[0028] Figure 4 This invention provides a flow chart of the pressurization and injection process for different gas sources in a multi-gas-source, multi-user gas injection and extraction switching metering process for a gas storage facility.

[0029] Figure 5 This is a flow chart of the gas extraction process for different users in a multi-gas-source, multi-user gas injection and extraction switching metering process for a gas storage facility according to the present invention.

[0030] Figure 6 This invention provides a flow chart of the gas extraction end-stage pressurization and external transmission process in a multi-gas-source, multi-user gas injection-production switching metering process for gas storage facilities.

[0031] In the diagram: 1. First shut-off valve; 2. Second shut-off valve; 3. First pigging valve; 4. Second pigging valve; 5. First control valve; 6. Second control valve; 7. Third control valve; 8. Fourth control valve; 9. Fifth control valve; 10. Sixth control valve; 11. Low-pressure transfer metering skid; 12. Seventh control valve; 13. Eighth control valve; 14. Ninth control valve; 15. Tenth control valve; 16. Third shut-off valve; 17. Fourth shut-off valve; 18. Third pigging valve; 19. Fourth pigging valve; 20. Eleventh control valve; 21. Twelfth control valve; 22. Thirteenth control valve; 23. Fourteenth control valve; 24. Fifteenth control valve; 25. Sixteenth control valve; 26. Control valve; 27. Seventeenth control valve; 28. Eighteenth control valve; 29. ​​High and medium pressure transfer metering skid; 30. Nineteenth control valve; 31. Twentieth control valve; 32. Twenty-first control valve; 33. Gas field inlet pipeline; 34. Low pressure pipeline; 35. Injection and production gas pipeline; 36. High and medium pressure pipeline; 37. First gas production and processing pipeline; 38. Second gas production and processing pipeline; 39. First booster pipeline; 40. Second booster pipeline; 41. Pipeline 1; 42. Pipeline 2; 43. Pipeline 3; 44. Pipeline 4; 45. Pipeline 5; 46. Pipeline 6; 47. Pipeline 7; 48. Pipeline 8; 49. Skid-mounted compressor. Detailed Implementation

[0032] 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.

[0033] Please see Figures 1 to 6 The present invention provides a technical solution: a multi-source, multi-user injection-production gas switching metering device for gas storage, which is used for injection-production gas switching metering under various operating conditions of gas storage. The multi-source, multi-user injection-production gas switching metering device for gas storage includes a gas field gas pipeline 33, a low-pressure pipeline 34, an injection-production gas pipeline 35, a high-pressure, medium-pressure pipeline 36, a first production gas processing pipeline 37, a second production gas processing pipeline 38, a first pressurization pipeline 39, and a second pressurization pipeline 40.

[0034] One end of the gas field inlet pipeline 33 is used to connect to the gas field, and the other end of the gas field inlet pipeline 33 is connected to the second gas production and processing pipeline 38. A pipe 44 connected to the gas field inlet pipeline 33 is installed on the gas field inlet pipeline 33. The end of the pipe 44 away from the gas field inlet pipeline 33 is connected to the second booster pipeline 40. A tenth control valve 15 is installed on the pipe 44.

[0035] One end of the low-pressure pipeline 34 is connected to the low-pressure tie line, which refers to the tie line at the end where the low-pressure natural gas user is located. The other end of the low-pressure pipeline 34 is equipped with a low-pressure transfer metering skid 11, which is a metering skid used to meter low-pressure natural gas. The middle section of the low-pressure pipeline 34 is connected to the first gas extraction and processing pipeline 37. One outlet end of the low-pressure transfer metering skid 11 is connected to the second booster pipeline 40 via pipeline three 43. The middle section of the low-pressure pipeline 34 is connected to the gas field inlet pipeline 33 via pipeline one 41, on which a second control valve 6 is installed. The other outlet end of the low-pressure transfer metering skid 11 is connected to the middle section of the low-pressure pipeline 34 via pipeline two 42, on which an eighth control valve 13 and a first control valve 5 are installed.

[0036] The first gas extraction and processing pipeline 37 is connected to pipeline 6 46. The other outlet of the high- and medium-pressure metering skid 28 is connected to the high- and medium-pressure pipeline 36 via pipeline 8 48. Pipeline 8 48 is equipped with a twentieth control valve 30 and a thirteenth control valve 22. The high- and medium-pressure metering skid 28 refers to a metering skid used for metering high- and medium-pressure natural gas. The second booster pipeline 40 is connected to the second gas extraction and processing pipeline 38 via pipeline 5 45. Pipeline 5 45 is equipped with an eleventh control valve 20. The first booster pipeline 39 is connected to the other inlet of the high- and medium-pressure metering skid 28 via pipeline 7 47. Pipeline 7 47 is equipped with a twenty-second control valve 32 and an eighteenth control valve 27.

[0037] One end of the injection-production gas pipeline 35 is connected to the injection-production gas trunk line, wherein the end of the injection-production gas trunk line away from the injection-production gas pipeline 35 is connected to the underground gas storage facility. The other end of the injection-production gas pipeline 35 is connected to the second gas production and processing pipeline 38, and the outlet end of the first pressurization pipeline 39 is connected to the end of the second gas production and processing pipeline 38 near the injection-production gas pipeline 35.

[0038] One end of the high-pressure / medium-pressure pipeline 36 is used to connect to the high-pressure / medium-pressure tie line, which refers to the tie line at the end where the high-pressure natural gas user is located. The other end of the high-pressure / medium-pressure pipeline 36 is equipped with a high-pressure / medium-pressure transfer metering skid 28. The high-pressure / medium-pressure pipeline 36 is connected to the second booster pipeline 40 through pipeline six 46. The sixteenth control valve 25 and the twenty-first control valve 31 are installed on pipeline six 46 respectively. One outlet end of the high-pressure / medium-pressure transfer metering skid 28 is connected to the second booster pipeline 40.

[0039] Pipe cleaning valves and shut-off valves are installed on the gas field inlet pipeline 33, low-pressure pipeline 34, injection-production pipeline 35, and high- and medium-pressure pipeline 36. The gas field inlet pipeline 33 is equipped with a fourth control valve 8 and a ninth control valve 14; the low-pressure pipeline 34 is equipped with a third control valve 7 and a sixth control valve 10; the first gas production and processing pipeline 37 is equipped with a fifth control valve 9; pipeline 33 is equipped with a seventh control valve 12; the second gas production and processing pipeline 38 is equipped with a fourteenth control valve 23; the first booster pipeline 39 is equipped with a twelfth control valve 21; the high- and medium-pressure pipeline 36 is equipped with a fifteenth control valve 24 and a seventeenth control valve 26; and the second booster pipeline 40 is equipped with a nineteenth control valve 29.

[0040] Among them, the gas field gas pipeline 33 is equipped with a second shut-off valve 2 and a second pigging valve 4; the low-pressure pipeline 34 is equipped with a first shut-off valve 1 and a first pigging valve 3; the gas injection and production pipeline 35 is equipped with a third shut-off valve 16 and a third pigging valve 18; and the high- and medium-pressure pipeline 36 is equipped with a fourth shut-off valve 17 and a fourth pigging valve 19.

[0041] Please see Figures 2 to 6 A multi-source, multi-user gas injection and production switching metering process for gas storage facilities includes five sub-processes: gas field gas processing process at different injection and production stages, self-pressurized gas injection process at the initial stage of gas injection, pressurized gas injection process at different gas sources, gas production processing process at different users, and pressurized external transmission process at the end of gas production.

[0042] The multi-source, multi-user injection-production gas switching metering process for gas storage facilities shown in this application is applicable to a multi-source, multi-user injection-production gas switching metering device for gas storage facilities. The five sub-processes represent five operational procedures required for the specific implementation of this multi-source, multi-user injection-production gas switching metering device for gas storage facilities, based on different working conditions.

[0043] Please see Figure 2 Gas field gas processing technology at different injection and production stages: Natural gas flows from the gas field into the gas field gas pipeline 33. The natural gas in the gas field gas pipeline 33 enters the injection and production gas processing system through the second gas production processing pipeline 38, or enters the skid-mounted compressor 49 through pipeline 44 and the second booster pipeline 40, or enters the low-pressure connecting line through pipeline 1 and the low-pressure pipeline 34.

[0044] The gas field inlet gas processing technology for different injection and production periods includes the gas injection process using the gas injection period as a gas source, the gas production process entering the produced gas processing system, and the gas production process directly entering the connecting line for external transmission. The gas injection process using the gas injection period as a gas source involves opening the second shut-off valve 2, the second pigging valve 4, the fourth control valve 8, and the ninth control valve 14, and closing the second control valve 6, the seventh control valve 12, the tenth control valve 15, the fourteenth control valve 23, the nineteenth control valve 29, and the twenty-first control valve 31. Natural gas flows from the gas field into the gas field inlet pipeline 33, and the natural gas in the gas field inlet pipeline 33 enters the injection and production gas processing system through the second production processing pipeline 38. During the gas production period, the produced gas processing procedure is as follows: Open the second shut-off valve 2, the second pigging valve 4, the fourth control valve 8, and the tenth control valve 15; close the second control valve 6, the ninth control valve 14, and the nineteenth control valve 29. Natural gas flows from the gas field into the gas field inlet pipeline 33. The natural gas in the gas field inlet pipeline 33 enters the skid-mounted compressor 49 through pipeline 44 and the second booster pipeline 40. The skid-mounted compressor 49 is used to pressurize the natural gas. During the gas production period, the direct transmission process to the connecting line is as follows: Open the second shut-off valve 2, the second pigging valve 4, the second control valve 6, the first pigging valve 3, and the first shut-off valve 1; close the first control valve 5, the third control valve 7, and the fourth control valve 8. Natural gas flows from the gas field into the gas field inlet pipeline 33. The natural gas in the gas field inlet pipeline 33 enters the low-pressure connecting line through pipeline 41 and the low-pressure pipeline 34.

[0045] Please see Figure 3 The initial self-pressurized gas injection process: the gas from the high-pressure and medium-pressure connecting line flows sequentially through the high-pressure and medium-pressure pipeline 36, the high-pressure and medium-pressure junction metering skid 28, pipeline 5 45, and the injection and production gas pipeline 35, and is then injected into the underground gas storage through the injection and production gas trunk line. The high-pressure and medium-pressure junction metering skid 28 measures the flow rate of natural gas transported by the high-pressure and medium-pressure connecting line.

[0046] During the initial injection phase, the pressure in the gas storage formation is relatively low. After gas arrives from the high- and medium-pressure interconnection line, the gas flows sequentially through the high- and medium-pressure pipeline 36, the high- and medium-pressure transfer metering skid 28, pipeline five 45, and the injection-production gas pipeline 35 before being injected into the underground gas storage through the injection-production gas trunk line, meeting the requirements for self-pressurized injection in the initial stage. During the initial self-pressurized injection, the following valves are opened: the fourth shut-off valve 17, the fourth pigging valve 19, the fifteenth control valve 24, the seventeenth control valve 26, the high- and medium-pressure transfer metering skid 28, the eleventh control valve 20, the third pigging valve 18, and the third shut-off valve 16. The twelfth control valve 21, the thirteenth control valve 22, the fourteenth control valve 23, the sixteenth control valve 25, the eighteenth control valve 27, the nineteenth control valve 29, and the twentieth control valve 30. The high- and medium-pressure transfer metering skid 28 is used to meter the flowing natural gas.

[0047] Please see Figure 4Different gas source boosting and injection processes include low-pressure interconnection line gas metering boosting and injection process and medium-high pressure interconnection line gas metering boosting and injection process. The gas source for the gas storage facility includes low-pressure interconnection line gas and medium-high pressure interconnection line gas. Since the pressures of the two sources are different, simultaneous injection using a compressor is not possible. Injection operations can be performed based on the incoming gas pressure, and there are two scenarios: one is low-pressure interconnection line gas metering boosting and injection, and the other is medium-high pressure interconnection line gas metering boosting and injection.

[0048] Low-pressure interconnection line gas metering and pressurization injection process: The gas from the low-pressure interconnection line passes sequentially through low-pressure pipeline 34, low-pressure transfer metering skid 11, pipeline 3 43, and second pressurization pipeline 40 before entering skid-mounted compressor 49. Skid-mounted compressor 49 pressurizes the natural gas, and the pressurized natural gas passes sequentially through first pressurization pipeline 39 and injection-production gas pipeline 35 before being injected into the underground gas storage through the injection-production gas trunk line.

[0049] During the gas metering and pressurization injection of the low-pressure connection line, the following valves are opened: the first shut-off valve 1, the first pigging valve 3, the third control valve 7, the sixth control valve 10, the low-pressure transfer metering skid 11, the seventh control valve 12, the twelfth control valve 21, the third pigging valve 18, and the third shut-off valve 16. The following valves are closed: the first control valve 5, the second control valve 6, the fifth control valve 9, the eighth control valve 13, the tenth control valve 15, the nineteenth control valve 29, the twenty-first control valve 31, the twenty-second control valve 32, the eleventh control valve 20, and the fourteenth control valve 23.

[0050] High- and medium-pressure interconnection line gas metering and pressurization injection process: High- and medium-pressure interconnection line gas passes through high- and medium-pressure pipeline 36, high- and medium-pressure transfer metering skid 28, and second pressurization pipeline 40 in sequence before entering skid-mounted compressor 49. Skid-mounted compressor 49 pressurizes the natural gas, and the pressurized natural gas passes through first pressurization pipeline 39 and injection-production gas pipeline 35 in sequence before being injected into underground gas storage through injection-production gas trunk line.

[0051] During the gas metering and pressurization injection of the high- and medium-pressure connecting line, the following valves are opened: the fourth shut-off valve 17, the fourth pigging valve 19, the fifteenth control valve 24, the seventeenth control valve 26, the high- and medium-pressure transfer metering skid 28, the nineteenth control valve 29, the twelfth control valve 21, the third pigging valve 18, and the third shut-off valve 16. The following valves are closed: the tenth control valve 15, the eleventh control valve 20, the thirteenth control valve 22, the sixteenth control valve 25, the eighteenth control valve 27, the twentieth control valve 30, the twenty-first control valve 31, the twenty-second control valve 32, and the fourteenth control valve 23.

[0052] Please see Figure 5Different gas extraction and processing technologies for different users include the initial gas extraction process of supplying gas to the medium- and high-pressure interconnection line and the later gas extraction process of supplying gas to the low-pressure interconnection line. The target users of the gas storage facility can be supplied through both low-pressure and medium- and high-pressure interconnection lines. Since the gas pressures of the two target users differ, gas extraction and processing operations are carried out according to the pressure requirements of the target users and the gas storage facility itself. There are two scenarios: one is that gas is supplied to the medium- and high-pressure user's location via the medium- and high-pressure interconnection line during the initial gas extraction phase; the other is that gas is supplied to the low-pressure user's location via the low-pressure interconnection line during the later gas extraction phase.

[0053] The initial gas extraction process involves the gas being transported to the medium- and high-pressure interconnection line: Gas from the injection-production gas main line passes sequentially through injection-production gas pipeline 35, second gas production processing pipeline 38, injection-production gas processing system, first gas production processing pipeline 37, pipeline six 46, high- and medium-pressure pipeline 36, high- and medium-pressure metering skid 28, pipeline eight 48, and high- and medium-pressure pipeline 36 before entering the high- and medium-pressure interconnection line, from which it is delivered to the target customer. The later gas extraction process involves the gas being transported to the low-pressure interconnection line: Gas from the injection-production gas main line passes sequentially through injection-production gas pipeline 35, second gas production processing pipeline 38, injection-production gas processing system, first gas production processing pipeline 37, low-pressure pipeline 34, low-pressure metering skid 11, pipeline two 42, and low-pressure pipeline 34 before entering the low-pressure interconnection line, from which it is delivered to the target user. The gas injection and production processing system can adopt the device shown in the Chinese patent CN104100235A, which discloses a gas injection and production gathering skid device and process method for a salt cavern gas storage facility. The gas injection and production processing system is used to improve the injection and production efficiency of underground gas storage facilities and to improve the safety and reliability of gas storage facilities.

[0054] Specifically, during the initial stage of gas extraction, when the gas is transported to the medium- and high-pressure user's location via the medium- and high-pressure connecting line, the following valves are opened: the third shut-off valve 16, the third pigging valve 18, the fourteenth control valve 23, the sixteenth control valve 25, the seventeenth control valve 26, the medium- and high-pressure transfer metering skid 28, the twentieth control valve 30, the thirteenth control valve 22, the fourth pigging valve 19, and the fourth shut-off valve 17. The following valves are closed: the fifth control valve 9, the ninth control valve 14, the eleventh control valve 20, the twelfth control valve 21, the fifteenth control valve 24, the eighteenth control valve 27, the nineteenth control valve 29, and the twenty-first control valve 31.

[0055] Please see Figure 6 The gas extraction end-stage pressurization and external transmission process includes two types: pressurization and external transmission of gas into the medium- and high-pressure interconnection line at the end of gas extraction, and pressurization and external transmission of gas from the gas field into the medium- and high-pressure interconnection line. At the end of gas extraction at the gas storage facility, the requirements of medium- and high-pressure target users cannot be met. The extracted gas is processed and pressurized before being sent to the medium- and high-pressure target users. Simultaneously, gas from the gas field can also be pressurized and sent to the medium- and high-pressure target users. This is because gas extraction pressurization is divided into two scenarios: one is pressurization and external transmission to the medium- and high-pressure target users via the medium- and high-pressure interconnection line at the end of gas extraction; the other is pressurization and external transmission of gas from the gas field into the medium- and high-pressure interconnection line.

[0056] At the end of the gas extraction process, the gas is delivered to the medium- and high-pressure interconnection line via a booster pressurization process: The gas from the injection and extraction main line passes sequentially through the injection and extraction pipeline 35, the second gas extraction and processing pipeline 38, the injection and extraction gas processing system, the first gas extraction and processing pipeline 37, pipeline six 46, the second booster pipeline 40, the skid-mounted compressor 49, the first booster pipeline 39, pipeline seven 47, the high- and medium-pressure transfer metering skid 28, pipeline eight 48, and the high- and medium-pressure pipeline 36 before entering the high- and medium-pressure interconnection line, and is then delivered to the target customer via the high- and medium-pressure interconnection line.

[0057] During the final stage of gas extraction, when the gas is pressurized and transported to the target user end of the medium- and high-pressure interconnection line, the following valves are opened: the third shut-off valve 16, the third pigging valve 18, the fourteenth control valve 23, the twenty-first control valve 31, the twenty-second control valve 32, the eighteenth control valve 27, the high- and medium-pressure transfer metering skid 28, the twentieth control valve 30, the thirteenth control valve 22, the fourth pigging valve 19, and the fourth shut-off valve 17. The following valves are closed: the fifth control valve 9, the seventh control valve 12, the ninth control valve 14, the tenth control valve 15, the eleventh control valve 20, the twelfth control valve 21, the fifteenth control valve 24, the sixteenth control valve 25, the seventeenth control valve 26, and the nineteenth control valve 29. Gas from the injection and production gas main line passes sequentially through injection and production gas pipeline 35, second production gas processing pipeline 38, injection and production gas processing system, first production gas processing pipeline 37, pipeline six 46, second booster pipeline 40, skid-mounted compressor 49, first booster pipeline 39, pipeline seven 47, high- and medium-pressure metering skid 28, pipeline eight 48, and high- and medium-pressure pipeline 36 before entering the high- and medium-pressure connecting line, and is then delivered to the target customer through the high- and medium-pressure connecting line.

[0058] Gas field gas boosting and transmission process to medium and high pressure interconnection line: Gas from the gas field passes sequentially through gas field gas pipeline 33, second gas production and processing pipeline 38, injection and production gas processing system, first gas production and processing pipeline 37, pipeline six 46, second boosting pipeline 40, skid-mounted compressor 49, first boosting pipeline 39, pipeline seven 47, high and medium pressure transfer metering skid 28, pipeline eight 48, and high and medium pressure pipeline 36 before entering the high and medium pressure interconnection line.

[0059] When the gas from the gas field is pressurized and transported to the medium- and high-pressure interconnection line to the target user end of the medium- and high-pressure line, the following valves are opened: the second shut-off valve 2, the second pigging valve 4, the fourth control valve 8, the ninth control valve 14, the twenty-first control valve 31, the twenty-second control valve 32, the eighteenth control valve 27, the high- and medium-pressure transfer metering skid 28, the twentieth control valve 30, the thirteenth control valve 22, the fourth pigging valve 19, and the fourth shut-off valve 17. The following valves are closed: the second control valve 6, the fifth control valve 9, the seventh control valve 12, the tenth control valve 15, the eleventh control valve 20, the twelfth control valve 21, the fifteenth control valve 24, the sixteenth control valve 25, the seventeenth control valve 26, and the nineteenth control valve 29. Gas from the gas field passes sequentially through the gas field gas pipeline 33, the second gas production and processing pipeline 38, the injection and production gas processing system, the first gas production and processing pipeline 37, pipeline six 46, the second booster pipeline 40, the skid-mounted compressor 49, the first booster pipeline 39, pipeline seven 47, the high- and medium-pressure transfer metering skid 28, pipeline eight 48, and the high- and medium-pressure pipeline 36 before entering the high- and medium-pressure connecting line.

[0060] 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-source, multi-user gas injection and production switching metering device for gas storage facilities, used for gas injection and production switching metering under various operating conditions in gas storage facilities, characterized in that: Including gas field inlet pipeline (33), low-pressure pipeline (34), gas injection and production pipeline (35), high- and medium-pressure pipeline (36), first gas production and processing pipeline (37), second gas production and processing pipeline (38), first booster pipeline (39) and second booster pipeline (40); One end of the gas field inlet pipeline (33) is used to connect to the gas field, and the other end of the gas field inlet pipeline (33) is connected to the second gas production and processing pipeline (38); One end of the low-pressure pipeline (34) is used to connect to the low-pressure connecting line, and the other end of the low-pressure pipeline (34) is equipped with a low-pressure transfer metering skid (11). The middle part of the low-pressure pipeline (34) is connected to the first gas extraction and processing pipeline (37). One outlet end of the low-pressure transfer metering skid (11) is connected to the second pressurization pipeline (40) through pipeline three (43). One end of the gas injection pipeline (35) is used to connect with the gas injection trunk line, and the other end of the gas injection pipeline (35) is connected with the second gas processing pipeline (38). The outflow end of the first pressurization pipeline (39) is connected with the end of the second gas processing pipeline (38) near the gas injection pipeline (35). One end of the high-pressure and medium-pressure pipeline (36) is used to connect with the high-pressure and medium-pressure connecting line, and the other end of the high-pressure and medium-pressure pipeline (36) is equipped with a high-pressure and medium-pressure transfer metering skid (28). The high-pressure and medium-pressure pipeline (36) is connected to the second pressurization pipeline (40) through pipeline six (46). The sixteenth control valve (25) and the twenty-first control valve (31) are respectively installed on pipeline six (46). One outlet end of the high-pressure and medium-pressure transfer metering skid (28) is connected to the second pressurization pipeline (40). The gas field gas pipeline (33) is connected to a pipe four (44), and the end of the pipe four (44) away from the gas field gas pipeline (33) is connected to the second pressurization pipeline (40). The pipe four (44) is equipped with a tenth control valve (15). The middle part of the low-pressure pipeline (34) is connected to the gas field gas pipeline (33) through pipeline one (41), and a second control valve (6) is installed on pipeline one (41); the other outlet end of the low-pressure transfer metering skid (11) is connected to the middle part of the low-pressure pipeline (34) through pipeline two (42), and an eighth control valve (13) and a first control valve (5) are installed on pipeline two (42). The gas storage facility implements a multi-source, multi-user gas injection and production switching metering process, which includes five sub-processes: gas field gas processing process at different injection and production stages, self-pressurized gas injection process at the initial stage of gas injection, pressurized gas injection process at different gas sources, gas production processing process at different users, and pressurized external transmission process at the end of gas production. Gas field gas processing technology during different injection and production periods: Natural gas flows from the gas field into the gas field gas pipeline (33). The natural gas in the gas field gas pipeline (33) enters the injection and production gas processing system through the second gas production processing pipeline (38), or enters the skid-mounted compressor (49) through pipeline four (44) and the second booster pipeline (40), or enters the low-pressure connecting line through pipeline one (41) and the low-pressure pipeline (34). Different gas source boosting and injection processes include low-pressure interconnection line gas metering boosting and injection process and high- and medium-pressure interconnection line gas metering boosting and injection process. Low-pressure connection line gas metering and pressurization injection process: The gas from the low-pressure connection line passes through the low-pressure pipeline (34), the low-pressure transfer metering skid (11), the third pipeline (43), and the second pressurization pipeline (40) in sequence before entering the skid-mounted compressor (49). The skid-mounted compressor (49) pressurizes the natural gas. The pressurized natural gas passes through the first pressurization pipeline (39) and the injection and production pipeline (35) in sequence before being injected into the underground gas storage through the injection and production trunk line. High and medium pressure connection line gas metering, pressurization and injection process: The gas from the medium-pressure connection line passes through the high-pressure and medium-pressure pipeline (36), the high-pressure and medium-pressure transfer metering skid (28), and the second pressurization pipeline (40) before entering the skid-mounted compressor (49). The skid-mounted compressor (49) pressurizes the natural gas, and the pressurized natural gas passes through the first pressurization pipeline (39), the injection and production gas pipeline (35), and then is injected into the underground gas storage through the injection and production gas trunk line.

2. The multi-source, multi-user gas injection and extraction switching metering device for a gas storage facility according to claim 1, characterized in that: The first gas collection and processing pipeline (37) is connected to pipeline six (46), and the other outlet end of the high-pressure and medium-pressure transfer metering skid (28) is connected to the high-pressure and medium-pressure pipeline (36) through pipeline eight (48). Pipeline eight (48) is equipped with the twentieth control valve (30) and the thirteenth control valve (22). The second pressurization pipeline (40) is connected to the second gas extraction and processing pipeline (38) through pipeline five (45). An eleventh control valve (20) is installed on pipeline five (45). The first pressurization pipeline (39) is connected to the other inflow end of the high-pressure and medium-pressure transfer metering skid (28) through pipeline seven (47). A twenty-second control valve (32) and an eighteenth control valve (27) are installed on pipeline seven (47).

3. A multi-source, multi-user gas injection and extraction switching metering device for a gas storage facility according to any one of claims 1 to 2, characterized in that: The gas field’s gas inlet pipeline (33), low-pressure pipeline (34), gas injection and production pipeline (35), and high- and medium-pressure pipeline (36) are all equipped with pigging valves and shut-off valves. The gas field inlet pipeline (33) is equipped with a fourth control valve (8) and a ninth control valve (14). The low-pressure pipeline (34) is equipped with a third control valve (7) and a sixth control valve (10). The first gas extraction and processing pipeline (37) is equipped with a fifth control valve (9). The pipeline three (43) is equipped with a seventh control valve (12). The second gas extraction and processing pipeline (38) is equipped with a fourteenth control valve (23). The first booster pipeline (39) is equipped with a twelfth control valve (21). The high- and medium-pressure pipelines (36) are equipped with a fifteenth control valve (24) and a seventeenth control valve (26). The second booster pipeline (40) is equipped with a nineteenth control valve (29).

4. A multi-source, multi-user gas injection and extraction switching metering process for gas storage facilities, applicable to the multi-source, multi-user gas injection and extraction switching metering device for gas storage facilities as described in any one of claims 1 to 3.

5. The multi-source, multi-user gas injection and extraction switching metering process for a gas storage facility according to claim 4, characterized in that, Initial self-pressurized gas injection process: Gas from the high- and medium-pressure connection line flows sequentially through the high- and medium-pressure pipeline (36), the high- and medium-pressure transfer metering skid (28), pipeline five (45), and the injection and production pipeline (35), and is then injected into the underground gas storage through the injection and production trunk line. The high- and medium-pressure transfer metering skid (28) measures the flow rate of natural gas transported by the high- and medium-pressure connection line.

6. The multi-source, multi-user gas injection and extraction switching metering process for a gas storage facility according to claim 4, characterized in that, Different gas extraction processes for different users include the initial gas extraction process of sending gas through a medium- and high-pressure interconnection line and the later gas extraction process of sending gas through a low-pressure interconnection line. Gas extraction process in the initial stage of gas extraction: Gas from the injection and extraction trunk line passes through the injection and extraction pipeline (35), the second gas extraction and processing pipeline (38), the injection and extraction processing system, the first gas extraction and processing pipeline (37), pipeline six (46), the high and medium pressure pipeline (36), the high and medium pressure transfer metering skid (28), pipeline eight (48), and the high and medium pressure pipeline (36) before entering the high and medium pressure connection line and being delivered to the target customer through the high and medium pressure connection line. Gas extraction process in the later stage: Gas from the injection and extraction main line passes through the injection and extraction pipeline (35), the second gas extraction and processing pipeline (38), the injection and extraction gas processing system, the first gas extraction and processing pipeline (37), the low-pressure pipeline (34), the low-pressure transfer metering skid (11), the second pipeline (42), and the low-pressure pipeline (34) before entering the low-pressure connection line and being delivered to the target user.

7. The multi-source, multi-user gas injection and extraction switching metering process for a gas storage facility according to claim 4, characterized in that, The gas production end-stage boosting and external transmission technology includes the gas production end-stage boosting and external transmission technology into the medium- and high-pressure interconnection line and the gas field gas boosting and external transmission technology into the medium- and high-pressure interconnection line. At the end of the gas extraction process, the gas is delivered to the medium and high pressure connection line through a booster pressurization process: The gas from the injection and extraction gas trunk line passes through the injection and extraction gas pipeline (35), the second gas extraction and processing pipeline (38), the injection and extraction gas processing system, the first gas extraction and processing pipeline (37), pipeline six (46), the second booster pipeline (40), the skid-mounted compressor (49), the first booster pipeline (39), pipeline seven (47), the high and medium pressure transfer metering skid (28), pipeline eight (48), and the high and medium pressure pipeline (36) before entering the high and medium pressure connection line and being delivered to the target customer through the high and medium pressure connection line; Gas field gas boosting and transmission process to medium and high pressure connection line: Gas from the gas field passes through the gas field gas pipeline (33), the second gas production and processing pipeline (38), the injection and production gas processing system, the first gas production and processing pipeline (37), pipeline six (46), the second boosting pipeline (40), the skid-mounted compressor (49), the first boosting pipeline (39), pipeline seven (47), the high and medium pressure transfer metering skid (28), pipeline eight (48), and the high and medium pressure pipeline (36) before entering the high and medium pressure connection line.

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