A liquid control cabinet matched with an oil and gas tree

Abstract

The utility model relates to the technical field of hydraulic control cabinet, especially to a kind of oil and gas tree supporting hydraulic control cabinet;Including cabinet, oil tank, first pressurizing component, second pressurizing component, first pressure relief component and second pressure relief component, the oil tank, the first pressurizing component, the second pressurizing component, the first pressure relief component and the second pressure relief component are all arranged in the cabinet interior;The first pressurizing component one end with the oil tank intercommunication, the other end passes through the cabinet and is communicated with gas tree ground safety valve, the second pressurizing component one end with the oil tank intercommunication, the other end passes through the cabinet and is communicated with gas tree downhole safety valve, the first pressure relief component one end with the oil tank intercommunication, the other end with the first pressurizing component intercommunication, the second pressure relief component one end with the oil tank intercommunication, the other end with the second pressurizing component intercommunication;The utility model satisfies the high pressure requirement of downhole safety law, simplifies the structure in hydraulic control cabinet.

Description

Technical Field

[0001] This utility model relates to the field of hydraulic control cabinet technology, and in particular to a hydraulic control cabinet for oil and gas tree assembly. Background Technology

[0002] A hydraulic control cabinet is a safety device used in conjunction with a wellhead system equipped with surface and downhole safety valves. Its main function is to quickly close either the surface or downhole safety valves in the event of an anomaly at the wellhead, ensuring wellhead control and preventing serious well control accidents. The hydraulic control cabinet works by using high-pressure hydraulic oil to generate sufficient thrust to overcome the spring forces of the surface and downhole safety valves, opening them to allow oil and gas flow and maintain production. If an anomaly necessitates rapid well shut-off, the hydraulic oil pressure is released urgently, causing the surface and downhole safety valves to close rapidly under spring force, controlling the oil and gas passage.

[0003] Currently, existing hydraulic control cabinets pressurize the pipelines through electric pumps. However, due to the limited pressure capacity of electric pumps, the maximum pressure they can generate is limited and cannot meet the requirements of downhole safety valves with higher pressure requirements. Therefore, it is necessary to install pressure regulating valves and boosters in conjunction with the electric pumps. In order to ensure the pipeline pressure of the fusible plug, pressure regulating valves are also required. This makes the pipeline more complex, resulting in too many components and joints inside the hydraulic control cabinet. This makes the internal structure of the hydraulic control cabinet very complex, difficult to maintain, and leads to frequent sealing failures and internal leakage failures. This results in frequent abnormal well shut-ins and brings many adverse effects to normal on-site production.

[0004] Therefore, there is an urgent need to provide a hydraulic control cabinet for oil and gas production trees that, compared with existing technologies, meets the high pressure requirements of downhole safety laws and simplifies the internal structure of the hydraulic control cabinet. Utility Model Content

[0005] This utility model solves the technical problems existing in the prior art and provides a hydraulic control cabinet for oil and gas tree.

[0006] To achieve the above objectives, the technical solution adopted by this utility model is as follows: A hydraulic control cabinet for a wellhead / gas production tree includes a cabinet body, an oil tank, a first pressurization component, a second pressurization component, a first pressure relief component, and a second pressure relief component. The oil tank, the first pressurization component, the second pressurization component, the first pressure relief component, and the second pressure relief component are all located inside the cabinet body. One end of the first pressurization component is connected to the oil tank, and the other end passes through the cabinet body and is connected to a surface safety valve. One end of the second pressurization component is connected to the oil tank, and the other end passes through the cabinet body and is connected to a downhole safety valve. One end of the first pressure relief component is connected to the oil tank, and the other end is connected to the first pressurization component. One end of the second pressure relief component is connected to the oil tank, and the other end is connected to the second pressurization component.

[0007] Furthermore, the first pressurization component includes a first motor, a first connecting rod, a second connecting rod, a first hand pump, and a second energy storage pipe. The output end of the first motor is connected to one end of the first connecting rod, the other end of the first connecting rod is rotatably connected to one end of the second connecting rod, the other end of the second connecting rod is connected to the first hand pump, and the first hand pump is connected to a ground safety valve through the second energy storage pipe.

[0008] Furthermore, a first pressure remote meter is connected in series on the second energy storage pipeline.

[0009] Furthermore, a third manual shut-off valve is connected in series on the second energy storage pipeline.

[0010] Furthermore, the first hand pump is connected to the second energy storage pipe via a first energy storage pipe, and a first outlet check valve is connected in series on the first energy storage pipe.

[0011] Furthermore, a first accumulator is connected between the first energy storage pipeline and the second energy storage pipeline, and the input and output terminals of the first accumulator are connected to a first manual shut-off valve.

[0012] Furthermore, the second pressurization assembly shown includes a second motor, a third link, a fourth link, a second hand pump, and a fourth energy storage pipe. The output end of the second motor is connected to one end of the third link, the other end of the third link is rotatably connected to one end of the fourth link, the other end of the fourth link is connected to the second hand pump, and the second hand pump is connected to the downhole safety valve through the fourth energy storage pipe.

[0013] Furthermore, a second remote pressure gauge is connected in series on the fourth energy storage pipeline.

[0014] Furthermore, a fourth manual shut-off valve is connected in series on the fourth energy storage pipeline.

[0015] Furthermore, the second hand pump is connected to the fourth energy storage pipe via a third energy storage pipe, and a second outlet check valve is connected in series on the third energy storage pipe.

[0016] Furthermore, a second accumulator is connected between the third and fourth energy storage pipes, and the input and output terminals of the second accumulator are connected to a second manual shut-off valve.

[0017] Furthermore, a connecting pipe is provided between the second energy storage pipe and the fourth energy storage pipe, and a manual shut-off valve is connected in series on the connecting pipe.

[0018] Furthermore, the second pressure relief assembly includes a second pressure relief pipe and a second manual pressure relief valve. One end of the second pressure relief pipe is connected to the oil tank and the other end is connected to the fourth energy storage pipe. The second manual pressure relief valve is connected in series on the second pressure relief pipe.

[0019] Furthermore, the second pressure relief assembly also includes a second electromagnetic pressure relief valve, which is disposed on the second pressure relief pipeline and is connected in parallel with the second manual pressure relief valve.

[0020] Furthermore, the first pressure relief assembly includes a first pressure relief pipe and a first manual pressure relief valve. One end of the first pressure relief pipe is connected to the oil tank and the other end is connected to the second energy storage pipe. The first manual pressure relief valve is connected in series on the first pressure relief pipe.

[0021] Furthermore, the first pressure relief assembly also includes a first electromagnetic pressure relief valve, which is disposed on the first pressure relief pipeline and is connected in parallel with the first manual pressure relief valve.

[0022] Furthermore, a control cabinet is connected to the outer wall of the cabinet, and the control cabinet is used to control all the circuits inside the liquid control cabinet.

[0023] Compared with the prior art, the beneficial effects of this utility model are as follows: This utility model uses a first motor to drive a first connecting rod and a second connecting rod, thereby driving a first hand pump to perform a pressurization operation, and uses a second motor to drive a third connecting rod and a fourth connecting rod, thereby driving a second hand pump to perform a pressurization operation. The pressurization pressure value can be adjusted as needed. It also includes a first pressure relief component and a second pressure relief component. The structure is simple and has a low failure rate, while ensuring that the hydraulic control cabinet can quickly achieve pressure relief and pressurization. Attached Figure Description

[0024] Figure 1 This is a schematic diagram of the overall structure of this utility model.

[0025] Explanation of reference numerals in the attached figures: 1. First motor; 2. First connecting rod; 3. Second connecting rod; 4. First hand pump; 5. First accumulator; 6. Second motor; 7. Third connecting rod; 8. Fourth connecting rod; 9. Second hand pump; 10. Second accumulator; 11. Control cabinet; 12. Oil tank; 13. First outlet check valve; 14. First manual pressure relief valve; 15. First electromagnetic pressure relief valve; 16. First remote pressure gauge; 17. Second manual pressure relief valve; 18. Second electromagnetic pressure relief valve; 19. Second outlet 20. Check valve; 21. Second pressure remote gauge; 22. Manual shut-off valve; 23. First manual shut-off valve; 24. Second manual shut-off valve; 25. Third manual shut-off valve; 26. Fourth manual shut-off valve; 27. First oil replenishment pipeline; 28. Second oil replenishment pipeline; 29. ​​First pressure relief pipeline; 30. Second pressure relief pipeline; 31. First energy storage pipeline; 32. Second energy storage pipeline; 33. Third energy storage pipeline; 34. Connecting pipeline; 35. Cabinet. Detailed Implementation

[0026] The technical solution of this utility model will be clearly described below with reference to the accompanying drawings. Obviously, the described embodiments are not all embodiments of this utility model. All other embodiments obtained by those skilled in the art without creative effort are within the protection scope of this utility model. It should be noted that the terms "center," "upper," "lower," "left," "right," "vertical," "horizontal," etc., indicating the orientation or positional relationship are based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing this utility model and simplifying the description. They do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this utility model.

[0027] like Figure 1 As shown, this utility model provides a hydraulic control cabinet for an oil and gas tree, including a cabinet body 35, a first pressurizing component, a second pressurizing component, a first depressurization component, and a second depressurization component. The first pressurizing component, the second pressurizing component, the first depressurization component, and the second depressurization component are all housed inside the cabinet body 35. The first pressurizing component is used to pressurize the surface safety valve, the first depressurization component is used to depressurize the surface safety valve, the second pressurizing component is used to pressurize the downhole safety valve, and the second depressurization component is used to depressurize the downhole safety valve. When the first pressurizing component fails, the second pressurizing component can still pressurize the surface safety valve; when the second pressurizing component fails, the first pressurizing component can still pressurize the downhole safety valve.

[0028] The first pressurization assembly includes a first motor 1, a first connecting rod 2, a second connecting rod 3, and a first hand pump 4. The output end of the first motor 1 is fixedly connected to one end of the first connecting rod 2, and the other end of the first connecting rod 2 is rotatably connected to one end of the second connecting rod 3. The other end of the second connecting rod 3 is rotatably fixedly connected to the first hand pump 4. The first hand pump 4 is connected to the oil tank 12 through the first oil replenishment pipe 26 and to the ground safety valve through the second energy storage pipe 31. A first pressure remote transmission gauge 16 is connected in series on the second energy storage pipe 31 and is used to detect the pressure value. The rotation of the first motor 1 drives the first connecting rod 2 and the second connecting rod 3 to move. The movement of the first connecting rod 2 and the second connecting rod 3 is equivalent to the swinging movement of the hand crank of the first hand pump 4, which drives the first hand pump 4 to pressurize and realize the pressurization in the pipeline.

[0029] The first hand pump 4 is connected to the second energy storage pipe 31 via the first energy storage pipe 30. The connection between the first and second energy storage pipes 30 and 31 is connected to the first accumulator 5. The input and output terminals of the first accumulator 5 share a first manual shut-off valve 22. A first outlet check valve 13 is connected in series on the first energy storage pipe 30. The first accumulator 5 is used to replenish energy to the ground safety valve without starting the first hand pump 4 in case of minor leakage in the pipes connected to the ground safety valve. The first outlet check valve 13 is used to prevent backflow of high-pressure liquid, protecting the first hand pump 4. The first manual shut-off valve 22 is normally open during normal operation and is used to store energy during the operation of the first hand pump 4.

[0030] The first pressure relief assembly includes a first manual pressure relief valve 14, a first electromagnetic pressure relief valve 15, a third manual shut-off valve 24, and a first pressure relief pipeline 28. One end of the first pressure relief pipeline 28 is connected to the oil tank 12, and the other end is connected to the second energy storage pipeline 31. The first manual pressure relief valve 14 and the first electromagnetic pressure relief valve 15 are both installed on the first pressure relief pipeline 28 and are connected in parallel. The third manual shut-off valve 24 is connected in series on the second energy storage pipeline 31 and is located between the ground safety valve and the first pressure remote transmission gauge 16.

[0031] The first manual pressure relief valve 14 is normally closed during normal operation. When manual pressure relief is required for the ground safety valve, the first manual pressure relief valve 14 is opened to release the hydraulic oil in the pipeline into the oil tank. The ground safety valve closes quickly. During normal maintenance pressure relief, the first manual shut-off valve 22 can be closed in advance to ensure that the first accumulator 5 is not depressurized.

[0032] The first electromagnetic pressure relief valve 15 is interlocked with the high and low pressure interlocking system of the single well back pressure pipeline at the oil and gas production site, the central control DCS system, the flame detector configured at the wellhead at the oil and gas production site, and the hydrogen sulfide detector configured at the wellhead at the oil and gas production site. The above-mentioned electrical connection relationship of the first electromagnetic pressure relief valve 15 adopts the connection method in the prior art, and the specific circuit is not described here. When the back pressure in the pipeline decreases below the low threshold or rises to the high threshold, the connection between the first electromagnetic pressure relief valve 15 and the high / low pressure interlock system of the single-well back pressure pipeline at the oil and gas production site closes, and the first electromagnetic valve opens. When the central control system issues an emergency well shut-in command, the connection between the first electromagnetic pressure relief valve 15 and the central control DCS system closes, and the first electromagnetic valve opens. When a flame detector detects a flame, the connection between the first electromagnetic pressure relief valve 15 and the flame detector configured at the wellhead at the oil and gas production site closes, and the first electromagnetic pressure relief valve 15 opens. When a hydrogen sulfide detector detects a hydrogen sulfide leak, the connection between the first electromagnetic pressure relief valve 15 and the hydrogen sulfide detector configured at the wellhead at the oil and gas production site closes, and the first electromagnetic pressure relief valve 15 opens. When the first electromagnetic pressure relief valve 15 opens, the hydraulic oil in the pipeline is released into the oil tank 12 through the first electromagnetic pressure relief valve 15, and the surface safety valve closes quickly, achieving well shut-in.

[0033] The second pressurization assembly includes a second motor 6, a third connecting rod 7, a fourth connecting rod 8, and a second hand pump 9. The output end of the second motor 6 is fixedly connected to one end of the third connecting rod 7, and the other end of the third connecting rod 7 is rotatably connected to one end of the fourth connecting rod 8. The other end of the fourth connecting rod 8 is rotatably fixedly connected to the second hand pump 9. The second hand pump 9 is connected to the oil tank 12 through the second oil replenishment pipe 27 and to the downhole safety valve through the fourth energy storage pipe 33. The fourth energy storage pipe 33 passes through the cabinet 35 and is connected to the downhole safety valve. A second pressure remote transmission gauge 20 is connected in series on the fourth energy storage pipe 33. The second pressure remote transmission gauge 20 is used to detect the pressure value. The rotation of the second motor 6 drives the third connecting rod 7 and the fourth connecting rod 8 to move. The movement of the third connecting rod 7 and the fourth connecting rod 8 is equivalent to the swinging movement of the hand crank of the second hand pump 9, which drives the second hand pump 9 to pressurize and realize the pressurization in the pipeline.

[0034] The second hand pump 9 is connected to the fourth energy storage pipe 33 via the third energy storage pipe 32. The connection between the fourth energy storage pipe 33 and the third energy storage pipe 32 is connected to the second accumulator 10. The common output and input terminals of the second accumulator 10 are equipped with a second manual shut-off valve 23. A second outlet check valve 19 is connected in series on the second energy storage pipe 31. The second accumulator 10 is used to replenish energy to the downhole safety valve without starting the second hand pump 9 in the event of a minor leak in the pipeline connected to the downhole safety valve. The second outlet check valve 19 is used to prevent backflow of high-pressure liquid, protecting the second hand pump 9. The second manual shut-off valve 23 is normally open during normal operation and is used to store energy during the operation of the second hand pump 9.

[0035] The second pressure relief assembly includes a second manual pressure relief valve 17, a second electromagnetic pressure relief valve 18, a fourth manual shut-off valve 25, and a second pressure relief pipeline 29. One end of the second pressure relief pipeline 29 is connected to the oil tank 12, and the other end is connected to the fourth energy storage pipeline 33. The second manual pressure relief valve 17 and the second electromagnetic pressure relief valve 18 are both installed on the second pressure relief pipeline 29. The second manual pressure relief valve 17 and the second electromagnetic pressure relief valve 18 are installed in parallel. The fourth manual shut-off valve 25 is connected in series with the fourth energy storage pipeline 33. The fourth manual shut-off valve 25 is installed between the downhole safety valve and the second pressure remote gauge 20.

[0036] The second manual pressure relief valve 17 is normally closed during normal operation. When manual pressure relief of the downhole safety valve is required, the second manual pressure relief valve 17 is opened to release the hydraulic oil in the pipeline into the oil tank. The downhole safety valve closes quickly. During normal maintenance pressure relief, the second manual shut-off valve 23 can be closed in advance to ensure that the second accumulator 10 is not depressurized.

[0037] The second electromagnetic pressure relief valve 18 is interlocked with the high and low pressure interlocking system of the single well back pressure pipeline at the oil and gas production site, the central control DCS system, the flame detector configured at the wellhead at the oil and gas production site, and the hydrogen sulfide detector configured at the wellhead at the oil and gas production site. The above-mentioned electrical connection relationship of the second electromagnetic pressure relief valve 18 adopts the connection method in the prior art, and the specific circuit is not described here. When the back pressure in the pipeline decreases below the low threshold or increases to the high threshold, the connection between the second electromagnetic pressure relief valve 18 and the high / low pressure interlock system of the single-well back pressure pipeline at the oil and gas production site closes, and the second electromagnetic valve opens. When the central control system issues an emergency well shut-in command, the connection between the second electromagnetic pressure relief valve 18 and the central control DCS system closes, and the second electromagnetic valve opens. When a flame detector detects a flame, the connection between the second electromagnetic pressure relief valve 18 and the flame detector configured at the wellhead at the oil and gas production site closes, and the second electromagnetic pressure relief valve 18 opens. When a hydrogen sulfide detector detects a hydrogen sulfide leak, the connection between the second electromagnetic pressure relief valve 18 and the hydrogen sulfide detector configured at the wellhead at the oil and gas production site closes, and the second electromagnetic pressure relief valve 18 opens. When the second electromagnetic pressure relief valve 18 opens, the hydraulic oil in the pipeline is released into the oil tank 12 through the second electromagnetic pressure relief valve 18, and the downhole safety valve closes quickly, achieving well shut-in.

[0038] The second energy storage pipeline 31 and the fourth energy storage pipeline 33 are connected by a connecting pipeline 34. A manual shut-off valve 21 is connected in series on the connecting pipeline 34. When one or more of the first motor 1, the first connecting rod 2, the second connecting rod 3, and the first hand pump 4 are not working properly, the manual shut-off valve 21 is opened and the fourth manual shut-off valve 25 is closed at the same time. The second pressurization component can pressurize the surface safety valve. When one or more of the second motor 6, the third connecting rod 7, the fourth connecting rod 8, and the second hand pump 9 are not working properly, the manual shut-off valve 21 is opened and the third manual shut-off valve 24 is closed at the same time. The first pressurization component can pressurize the downhole safety valve.

[0039] The cabinet 35 is externally connected to the control cabinet 11, which is used to control all the circuits in the entire hydraulic control cabinet and has explosion-proof function. The first motor 1 and the second motor 6 are both connected to the reduction device. The reduction device converts the high-speed rotation of the first motor 1 and the second motor 6 into low-speed rotation, providing kinetic energy output for the first link 2 and the third link 7. The reduction device is an existing reduction device, and its specific structure will not be described in detail here.

[0040] This utility model uses a first motor 1 to drive a first connecting rod 2 and a second connecting rod 3, thereby driving a first hand pump 4 to perform a pressurization operation, and uses a second motor 6 to drive a third connecting rod 7 and a fourth connecting rod 8, thereby driving a second hand pump 9 to perform a pressurization operation. The pressurization pressure value can be adjusted as needed. It also includes a first pressure relief component and a second pressure relief component. The structure is simple and has a low failure rate, while ensuring that the hydraulic control cabinet can quickly achieve pressure relief and pressurization.

[0041] Finally, it should be noted that the above content is only used to illustrate the technical solution of this utility model, and is not intended to limit the scope of protection of this utility model. Simple modifications or equivalent substitutions made by those skilled in the art to the technical solution of this utility model do not depart from the essence and scope of the technical solution of this utility model.

Claims

1. A hydraulic control cabinet for oil and gas production trees, characterized in that, The device includes a cabinet, an oil tank, a first pressurizing component, a second pressurizing component, a first depressurization component, and a second depressurization component. The oil tank, the first pressurizing component, the second pressurizing component, the first depressurization component, and the second depressurization component are all located inside the cabinet. One end of the first pressurizing component is connected to the oil tank, and the other end passes through the cabinet and is connected to a surface safety valve. One end of the second pressurizing component is connected to the oil tank, and the other end passes through the cabinet and is connected to a downhole safety valve. One end of the first depressurization component is connected to the oil tank, and the other end is connected to the first pressurizing component. One end of the second depressurization component is connected to the oil tank, and the other end is connected to the second pressurizing component.

2. The hydraulic control cabinet for a wellhead gas production line according to claim 1, characterized in that, The first pressurization assembly includes a first motor, a first connecting rod, a second connecting rod, a first hand pump, and a second energy storage pipe. The output end of the first motor is connected to one end of the first connecting rod, the other end of the first connecting rod is rotatably connected to one end of the second connecting rod, the other end of the second connecting rod is connected to the first hand pump, and the first hand pump is connected to a ground safety valve through the second energy storage pipe.

3. The hydraulic control cabinet for a wellhead gas production line according to claim 2, characterized in that, A first pressure remote meter is connected in series on the second energy storage pipeline.

4. The hydraulic control cabinet for a wellhead gas production line according to claim 2, characterized in that, A third manual shut-off valve is connected in series on the second energy storage pipeline.

5. The hydraulic control cabinet for a wellhead gas production line according to claim 2, characterized in that, The first hand pump is connected to the second energy storage pipe through the first energy storage pipe, and the first outlet check valve is connected in series on the first energy storage pipe.

6. The hydraulic control cabinet for a wellhead gas production line according to claim 5, characterized in that, A first accumulator is connected between the first energy storage pipeline and the second energy storage pipeline, and the input and output terminals of the first energy storage pipeline are connected to a first manual shut-off valve.

7. The hydraulic control cabinet for a wellhead gas production tree according to claim 2, characterized in that, The second pressurization assembly shown includes a second motor, a third link, a fourth link, a second hand pump, and a fourth energy storage pipeline. The output end of the second motor is connected to one end of the third link, the other end of the third link is rotatably connected to one end of the fourth link, the other end of the fourth link is connected to the second hand pump, and the second hand pump is connected to the downhole safety valve through the fourth energy storage pipeline.

8. The hydraulic control cabinet for a wellhead gas production line according to claim 7, characterized in that, A second remote pressure gauge is connected in series on the fourth energy storage pipeline.

9. The hydraulic control cabinet for a wellhead gas production line according to claim 7, characterized in that, A fourth manual shut-off valve is connected in series on the fourth energy storage pipeline.

10. A hydraulic control cabinet for a wellhead gas production tree according to claim 7, characterized in that, The second hand pump is connected to the fourth energy storage pipe through the third energy storage pipe, and a second outlet check valve is connected in series on the third energy storage pipe.

11. A hydraulic control cabinet for a wellhead gas production tree according to claim 10, characterized in that, A second accumulator is connected between the third and fourth energy storage pipelines, and the input and output terminals of the second accumulator are connected to a second manual shut-off valve.

12. The hydraulic control cabinet for a wellhead gas production tree according to claim 7, characterized in that, The second energy storage pipeline and the fourth energy storage pipeline are connected by a connecting pipeline, and a manual shut-off valve is connected in series on the connecting pipeline.

13. The hydraulic control cabinet for a wellhead gas production line according to claim 7, characterized in that, The second pressure relief assembly includes a second pressure relief pipe and a second manual pressure relief valve. One end of the second pressure relief pipe is connected to the oil tank and the other end is connected to the fourth energy storage pipe. The second manual pressure relief valve is connected in series on the second pressure relief pipe.

14. The hydraulic control cabinet for a wellhead gas production line according to claim 13, characterized in that, The second pressure relief assembly also includes a second electromagnetic pressure relief valve, which is disposed on the second pressure relief pipeline and is connected in parallel with the second manual pressure relief valve.

15. The hydraulic control cabinet for a wellhead gas production tree according to claim 2, characterized in that, The first pressure relief assembly includes a first pressure relief pipe and a first manual pressure relief valve. One end of the first pressure relief pipe is connected to the oil tank and the other end is connected to the second energy storage pipe. The first manual pressure relief valve is connected in series on the first pressure relief pipe.

16. A hydraulic control cabinet for a wellhead gas production tree according to claim 15, characterized in that, The first pressure relief assembly further includes a first electromagnetic pressure relief valve, which is disposed on the first pressure relief pipeline and is connected in parallel with the first manual pressure relief valve.

17. The hydraulic control cabinet for a wellhead gas production tree according to claim 1, characterized in that, The outer wall of the cabinet is connected to a control cabinet, which is used to control all the circuits inside the liquid control cabinet.

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