Degassing pry system for oil field

Abstract

The invention relates to the technical field of oil field equipment, and particularly discloses a degassing pry system for an oil field, which comprises a degassing tank, a safety discharge assembly, an exhaust assembly, a liquid discharge assembly, a first level gage and a second level gage, the safety discharge assembly and the exhaust assembly are respectively connected to the top of the degassing tank through a safety valve pipeline and an associated gas pipeline; the liquid discharging assembly is connected to the bottom of the degassing tank through a liquid outlet pipeline, and the first material level meter and the second material level meter are arranged outside the side wall of the degassing tank. The safe discharge assembly, the exhaust assembly, the liquid discharge assembly, the first level gage and the second level gage are all integrally mounted on the degassing tank, the process matching is reasonable, the degassing efficiency is high, the process can adapt to various working conditions, the degassing device is an optimal optimal configuration scheme with large degassing treatment capacity and high efficiency, and the oilfield exploitation benefits are effectively improved.

Description

Technical Field

[0001] This invention relates to the field of oilfield equipment technology, and in particular to a degassing skid system for oilfields. Background Technology

[0002] As oil fields are continuously developed, the produced fluids carry a significant amount of gas, which affects the final recovery rate, increases production costs, and reduces the profitability of oil field development. Furthermore, in offshore oilfield development, it is easier to extract natural gas hydrate layers. During the process of returning the produced fluids from the wellbore to the wellhead, the natural gas hydrates continuously decompose into gas within the wellbore, greatly increasing the gas content of the produced fluids. Currently, most degassing devices used in oil fields have simple structures and unreasonable process matching, resulting in low degassing efficiency and limited adaptability to specific operating conditions. Chinese invention patent ZL201510037727.1 discloses a skid-mounted crude oil dehydration device. This invention integrates functions such as dehydration, degassing, and data detection of oil well produced fluids. It concentrates all components on a single skid and adopts an integrated skid-mounted installation structure. It integrates functions, occupies a small area, and is easy to operate and manage. It solves the problems of long construction cycle and large area occupied by oilfield produced fluid dehydration equipment. However, it does not solve the problem of safe discharge of the extracted liquid and gas. Chinese invention patent ZL 202111156328.9 discloses a skid-mounted high-efficiency vertical three-phase separator. In this invention, an oil-gas mixture enters a gas-liquid separator through an inlet. Under the action of centrifugal force, preliminary gas-liquid separation is performed. The liquid enters a hydrocyclone, where the three-phase separation of oil, water, and gas is completed under the action of spiral guide vanes. The gas phase is discharged from the top, while the oil droplets gradually move towards the center of the spiral guide vanes due to centrifugal force. The water phase moves towards the inner wall of the hydrocyclone and flows out from the bottom. The invention also includes a secondary oil-water separation process to further ensure the separation effect. However, its technical solution only solves the three-phase separation of oil, water, and gas and does not solve the problem of safe discharge of the subsequently separated liquid and gas. Therefore, in order to solve the aforementioned practical problems, we have developed a system to address them. Summary of the Invention

[0003] The purpose of this invention is to solve the problems in the prior art and provide a degassing skid system for oil fields.

[0004] The technical solution of the present invention is as follows: an oilfield degassing skid system includes a degassing tank, a safety discharge component, an exhaust component, a liquid discharge component, a first level gauge, and a second level gauge. The safety discharge component and the exhaust component are respectively connected to the top of the degassing tank through a safety valve pipeline and an associated gas pipeline. The liquid discharge component is connected to the bottom of the degassing tank through a liquid outlet pipeline. The first level gauge and the second level gauge are respectively installed on the outside of the side wall of the degassing tank.

[0005] Preferably, the safety emission assembly includes three pipelines: a first pipeline, a second pipeline, and a third pipeline. The first and second pipelines are connected in parallel and then converge, located on two separate side paths, and both are directly connected to safety valves. The first pipeline is equipped with a normally open ball valve 1, and the second pipeline is equipped with a normally closed ball valve 2. At the outlet of the normally open ball valve 1, a reducer, a spring safety valve 1, and a normally open ball valve 3 are sequentially installed. At the outlet of the normally closed ball valve 2, a reducer, a spring safety valve 2, and a normally open ball valve 2 are sequentially installed. The third pipeline is located in the middle path and is independent. The third pipeline is equipped with a normally closed ball valve 1 and a normally closed stop valve 1 in sequence.

[0006] Preferably, the exhaust assembly includes a central regulating pipe, a first bypass pipe, and a second bypass pipe. The central regulating pipe is a straight pipe and is sequentially equipped with a normally open ball valve four, an ultrasonic flow meter, a normally open ball valve seven, a normally open ball valve six, a frequency converter shut-off valve, a normally open ball valve five, a one-way valve one, and a flame arrester. The ultrasonic flow meter is equipped with a corresponding flow transmitter, temperature transmitter, and pressure transmitter. The first bypass pipe is equipped with a normally closed ball valve three, and the first bypass pipe starts at the inlet of the normally open ball valve four and ends at the outlet of the normally open ball valve seven. The second bypass pipe is sequentially equipped with a normally closed ball valve four and a normally closed shut-off valve two, and the second bypass pipe starts at the inlet of the normally open ball valve six and ends at the outlet of the normally open ball valve five.

[0007] Preferably, the degassing tank is a vertical container. The degassing tank has a convex head at the top, a cylindrical body in the middle, and a skirt support at the bottom. The degassing tank includes a tank body. A detachable wire mesh demister is installed in the upper part of the tank body. A liquid inlet pipe is installed in the middle part of the tank body. A manhole is installed on the tank wall in the middle part of the tank body. A sand flushing pipe is installed in the lower middle part of the tank body. A vortex breaker is installed below the sand flushing pipe in the lower middle part of the tank body. The lower end of the vortex breaker is connected to the liquid outlet. An exhaust pipe is installed on the side wall below the vortex breaker in the lower middle part of the tank body. An inspection hole is installed in the lower middle part of the tank body.

[0008] Preferably, the tank body is provided with a group of ports for assembling various components. The group of ports includes a pressure gauge port, a pressure transmitter port 1, a pressure transmitter port 2, a pressure transmitter port 3, a temperature sensor port, a level gauge port 1, a level gauge port 2, and an air outlet. Pressure transmitter port 1, pressure transmitter port 2, and the air outlet are all located at the top of the tank body. Pressure transmitter port 3 is located below the wire mesh demister and at a distance of ≥200mm from the top of the tank body. The temperature sensor port is located in the middle of the tank body and above the sand flushing pipe. Level gauge port 1 is located above level gauge port 2.

[0009] Preferably, the pipe assembly also includes a safety valve port, which is equipped with a safety valve or an emergency drain valve. The tank is equipped with a level-pressure differential interlock, which triggers the emergency drain valve to open when the upper liquid level is ≥90% of the tank height and the pressure difference is ≥0.03MPa.

[0010] Preferably, the drainage assembly includes a central pipeline and a third bypass pipeline. The central pipeline is sequentially equipped with a normally open ball valve eight, a control valve group, a normally open ball valve eleven, a pneumatic shut-off valve, a normally open ball valve ten, a pneumatic shut-off valve, a one-way valve two, and a corrosion monitoring device. The control valve group is a digitally signal-controlled pneumatic ball valve, which includes a normally open ball valve nine connected by a three-way valve, a shut-off valve with a handwheel, and a shut-off pilot valve. The shut-off valve with the handwheel is connected to a solenoid valve, a position switch, and an indicator. A sampling port is provided on the pipeline between normally open ball valve nine and normally open ball valve eleven. The third bypass pipeline is sequentially equipped with a normally closed ball valve five and a normally closed shut-off valve three. The third bypass pipeline starts at the inlet of normally open ball valve eleven and ends at the outlet of normally open ball valve ten.

[0011] Preferably, the first and second level gauges cover 0-80% of the tank height below the inlet pipe, with alarm thresholds of ≤10% for low liquid level and ≥70% for high liquid level, and an accuracy of +1%FS for both level gauges. The first and second level gauges also cover 20%-100% of the tank height at their upper and lower ends, with alarm thresholds of ≤85% for upper liquid level and ≥15% for lower liquid level, and an accuracy of +0.5%FS for both level gauges. The installation distance between the first and second level gauges is ≥1.5m between the upper and lower liquid levels.

[0012] Preferably, both the first and second pipelines are equipped with branch lines, and each branch line is equipped with a normally closed ball valve, which can be used as a manual discharge or pressure test interface.

[0013] Preferably, an umbrella-shaped separation component is provided on the liquid inlet pipe.

[0014] The present invention, employing the above-described structure, has the following advantages: 1. The safety emission components, exhaust components, liquid discharge components, first level gauge and second level gauge are all integrated and installed on the degassing tank. The process is reasonably matched, the degassing efficiency is high, and the process can adapt to various working conditions. It is the best optimized configuration solution with large degassing capacity and high efficiency, which effectively improves the oilfield exploitation benefits. 2. The combination of the umbrella-shaped separation component and the vortex breaker on the liquid inlet pipe accelerates the separation of gas and liquid, improving the degassing efficiency; 3. The three pressure transmitters on the tank, positioned in different locations, can display not only the pressure inside the tank but also the pressure difference inside the tank, effectively providing a pressure difference signal for intelligent process control; 4. The straight pipeline, multi-parameter measurement and safe discharge design in the exhaust assembly achieves stable flow and risk control, optimizes valve sequence, expands instrument range and strengthens safety devices. The improved process can improve measurement accuracy by more than 20%, while reducing the overpressure accident rate to <0.1 times / year. 5. A spring-return emergency shut-off valve can be added after the pneumatic ball valve to the drain assembly. The mechanical interlock trigger pressure is ≤0.8MPa, which solves the problem that the lack of mechanical interlock device when relying solely on the combination of pneumatic shut-off valve and pneumatic ball valve may lead to regulation failure in the event of air source failure. 6. The drainage assembly is equipped with a corrosion monitoring device. The corrosion-resistant pads are not only placed on the central pipeline, but also cover high-risk areas of local corrosion such as valve sealing surfaces and welds, which is beneficial for the detection and replacement of corroded pipe fittings. Attached Figure Description

[0015] Figure 1 This is a schematic diagram of the structure of the present invention; Figure 2 This is a schematic diagram of the full cross-section of the degassing tank; Figure 3 This is a schematic diagram of the safe emission component process; Figure 4 This is a schematic diagram of the exhaust assembly process; Figure 5 This is a schematic diagram of the drainage component process; Figure 6 This is a top view of the sand flushing pipe structure.

[0016] In the diagram: 1. Safety emission assembly; 2. Exhaust assembly; 3. Degassing tank; 4. First level gauge; 5. Second level gauge; 6. Drainage assembly; 11. Spring safety valve one; 12. Normally open ball valve one; 13. Normally closed shut-off valve one; 14. Normally closed ball valve one; 15. Normally closed ball valve two; 16. Spring safety valve two; 17. Normally open ball valve two; 18. Normally open ball valve three; 21. Normally open ball valve four; 22. Normally closed ball valve three; 23. Ultrasonic flow meter; 24. 25. Normally closed ball valve 4; 26. Normally closed stop valve 2; 27. Flame arrester; 28. Check valve 1; 29. ​​Normally open ball valve 5; 20. Variable frequency stop valve; 210. Normally open ball valve 6; 211. Normally open ball valve 7; 212. Flow accumulator; 213. Flow indicator; 214. Flow transmitter; 215. Temperature transmitter; 216. Pressure transmitter; 217. Straight pipeline; 31. Tank; 32. Pressure gauge port; 33. Wire mesh demister; 34. 35. Liquid inlet pipe; 36. Pressure transmitter port 3; 37. Umbrella-shaped separator assembly; 38. Manhole; 39. Temperature sensor port; 30. Sand flushing pipe; 310. Exhaust pipe; 311. Vortex breaker; 312. Inspection hole; 313. Liquid outlet; 314. Level gauge port 2; 315. Level gauge port 1; 316. Safety valve port; 317. Pressure transmitter port 2; 318. Air outlet; 319. Pressure transmitter port 1; 61. Shut-off pilot valve; 62. 63. Solenoid valve; 64. Normally open ball valve VIII; 65. Shut-off valve with handwheel; 66. Normally open ball valve IX; 67. Sampling port; 68. Normally closed ball valve V; 69. Normally closed shut-off valve III; 60. Pneumatic shut-off valve; 610. Corrosion insert; 611. Corrosion probe; 612. Check valve II; 613. Normally open ball valve X; 614. Pneumatic shut-off valve; 615. Normally open ball valve XI; 616. Open position switch; 617. Closed position switch; 618. Three-way valve. Detailed Implementation

[0017] To make the technical means, technical features, inventive purpose and technical effects of this invention easier to understand, the invention will be further described below with reference to specific illustrations.

[0018] like Figure 1 As shown, an oilfield degassing skid system includes a degassing tank 3, a safety discharge component 1, an exhaust component 2, a liquid discharge component 6, a first level gauge 4, and a second level gauge 5. The safety discharge component 1 and the exhaust component 2 are connected to the top of the degassing tank 3 through a safety valve pipeline and an associated gas pipeline, respectively. The liquid discharge component 6 is connected to the bottom of the degassing tank 3 through a liquid outlet pipeline. The first level gauge 4 and the second level gauge 5 are installed on the outside of the side wall of the degassing tank 3, respectively. like Figure 3As shown, the safety emission assembly 1 includes three pipelines: a first pipeline, a second pipeline, and a third pipeline. The first and second pipelines are connected in parallel and then converge, located on two separate side paths, and both are directly connected to safety valves. The first pipeline is equipped with a normally open ball valve 12, and the second pipeline is equipped with a normally closed ball valve 15. At the outlet of the normally open ball valve 12, a reducer, a spring safety valve 11, and a normally open ball valve 18 are installed in sequence. At the outlet of the normally closed ball valve 15, a reducer, a spring safety valve 16, and a normally open ball valve 17 are installed in sequence. The third pipeline is located in the middle path and is independent. The third pipeline is equipped with a normally closed ball valve 14 and a normally closed shut-off valve 13 in sequence. Both the first and second pipelines also have branch paths, on which normally closed ball valves are installed. The normally closed ball valves can be used as manual emission or pressure test interfaces. like Figure 4 As shown, the exhaust assembly 2 includes a central regulating pipe, a first bypass pipe, and a second bypass pipe. The central regulating pipe is a straight pipe 217 and is sequentially equipped with a normally open ball valve 21, an ultrasonic flow meter 23, a normally open ball valve 211, a normally open ball valve 210, a frequency converter shut-off valve 29, a normally open ball valve 28, a check valve 27, and a flame arrester 26. The ultrasonic flow meter 23 is equipped with a corresponding flow transmitter 214, a temperature transmitter 215, and a pressure transmitter 216. The first bypass pipe is equipped with a normally closed ball valve 22. The first bypass pipe starts at the inlet of the normally open ball valve 21 and ends at the outlet of the normally open ball valve 211. The second bypass pipe is sequentially equipped with a normally closed ball valve 24 and a normally closed shut-off valve 25. The second bypass pipe starts at the inlet of the normally open ball valve 210 and ends at the outlet of the normally open ball valve 28. like Figure 2 As shown, the degassing tank 3 is a vertical container. The degassing tank 3 has a convex head at the top, a cylindrical body in the middle, and a skirt support at the bottom. The degassing tank 3 includes a tank body 31. A detachable wire mesh demister 33 is installed in the upper part of the tank body 31. An inlet pipe 34 is installed in the middle of the tank body 31, with its opening extending outside the tank body 34. An umbrella-shaped separation component 36 is installed on the inlet pipe 34. A manhole 37 is provided on the tank wall in the middle of the tank body 31. A sand flushing pipe 39 is installed in the lower middle part of the tank body 31. Figure 6 As shown, the opening of the sand flushing pipe 39 extends out of the tank body 31. A vortex breaker 311 is installed in the lower middle part of the tank body 31 below the sand flushing pipe 39. The lower end of the vortex breaker 311 is connected to the liquid outlet 313. An exhaust pipe 310 is provided on the side wall below the vortex breaker 311 in the lower middle part of the tank body 31. An inspection hole 312 is provided in the lower part of the tank body 31. The tank body 31 is machined with a group of ports for assembling various components. This group includes a pressure gauge port 32, a pressure transmitter port 1 319, a pressure transmitter port 2 317, a pressure transmitter port 35, a temperature sensor port 38, a level gauge port 1 315, a level gauge port 2 314, and a vent port 318. Pressure transmitter ports 1 319, 2 317, and vent port 318 are all located at the top of the tank body 31. Pressure transmitter port 35 is located below the wire mesh demister 33 and at least 200mm from the top of the tank body 31 to reduce interference from the vapor phase condensate. The temperature sensor port 38 is located in the middle of the tank body 31, above the sand flushing pipe 39, and at least 200mm from the end cap weld to ensure it is submerged in the flowing liquid phase. The temperature sensor is inserted at least 10mm into the liquid. 0mm (to avoid temperature conduction error of the end cap wall), level gauge port 1 315 is located above level gauge port 2 314; the pipe group also includes safety valve port 316, which is equipped with a safety valve or emergency drain valve. A level-differential pressure interlock is installed on the tank body 31. When the upper liquid level is ≥90% of the height of the tank body 31 and the air pressure difference is ≥0.03MPa, the emergency drain valve is triggered to open; pressure gauge port 32 is equipped with a pressure gauge, pressure transmitter port 1 319 is equipped with a first pressure transmitter, pressure transmitter port 2 317 is equipped with a second pressure transmitter, pressure transmitter port 35 is equipped with a third pressure transmitter, temperature sensor port 38 is equipped with a temperature sensor, level gauge port 1 315 is equipped with a first level gauge 4, and level gauge port 2 314 is equipped with a second level gauge 5; like Figure 5 As shown, the drainage assembly 6 includes a central pipeline and a third bypass pipeline. The central pipeline is sequentially equipped with a normally open ball valve 63, a control valve group, a normally open ball valve 615, a pneumatic shut-off valve 614, a normally open ball valve 613, a pneumatic shut-off valve 69, a check valve 612, and a corrosion monitoring device. The control valve group is a digitally controlled pneumatic ball valve. The control valve group includes a normally open ball valve 65, a shut-off valve 64 with a handwheel, and a shut-off pilot valve 61, all connected via a three-way valve 618. The shut-off valve 64 with a handwheel is connected to a solenoid valve 62, a position switch, and an indicator. A sampling port 66 is provided on the pipeline between the normally open ball valve 65 and the normally open ball valve 615. The third bypass pipeline is sequentially equipped with a normally closed ball valve 67 and a normally closed shut-off valve 68. The third bypass pipeline starts at the inlet of the normally open ball valve 615 and ends at the outlet of the normally open ball valve 613. The position switches and indicators include an open position switch 616 and a closed position switch 617. The corrosion monitoring device includes a corrosion plate 610 and a corrosion probe 611. This device is used to periodically assess the corrosion rate of the pipeline inner wall. Combined with the physical properties of the medium (such as the corrosiveness of high water content crude oil), it can optimize material selection and maintenance cycle, and extend the service life of the equipment. A spring-return emergency shut-off valve is added to the existing process. Miniature plates (size 10*10mm) are installed at the valve body flange and tee connection. A wireless transmission corrosion rate sensor is used. The tee valve 618 is connected to the AS instrument air supply. The first level gauge 4 and the second level gauge 5 cover 0-80% of the tank 31 height below the inlet pipe 34. The alarm thresholds of the first level gauge 4 and the second level gauge 5 are ≤10% for low liquid level and ≥70% for high liquid level. The accuracy of the first level gauge 4 and the second level gauge 5 is +1%FS. The first level gauge 4 and the second level gauge 5 cover 20%-100% of the tank 31 height at the upper and lower ends. The alarm thresholds of the first level gauge 4 and the second level gauge 5 are ≤85% for upper liquid level and ≥15% for lower liquid level. The accuracy of the first level gauge 4 and the second level gauge 5 is +0.5%FS. The installation distance between the first level gauge 4 and the second level gauge 5 is ≥1.5m between the upper and lower liquid levels to avoid measurement overlap errors. Working principle: The produced liquid enters the degassing tank 3 through the inlet pipe 34. The gas and liquid are accelerated and separated by the combination of the umbrella-shaped separation component 36 and the vortex breaker 311 in the tank body 31. The separated liquid is sent to the subsequent production separator through the discharge component 6. The pneumatic shut-off valve 614 and the control valve group in the discharge component 6 can control the amount of liquid discharged. The control valve group is connected through the three-way valve 618 to realize the dual functions of precise flow regulation and emergency shut-off. The handwheel design of the shut-off valve 64 with handwheel supports manual operation, ensuring that the process can still maintain stability when the automatic control system fails. The position switch and indicator can provide real-time feedback on the valve status, which is convenient for remote monitoring and fault diagnosis, and improves operational safety and response efficiency. The gas separated from the degassing tank 3 passes through the wire mesh demister 33 to remove foam, and the associated gas enters the intermediate adjustment pipeline of the exhaust assembly 2. The length of the straight pipeline 217 is not less than 10 times its diameter (for example, for a DN100 pipe, its length should not be less than 1000mm). Then the associated gas enters the ultrasonic flow meter 23. Since the gas volume is significantly affected by temperature and pressure, it is necessary to convert the working flow rate into the volumetric flow rate under standard conditions through real-time monitoring data. Therefore, the ultrasonic flow meter 23 needs to be matched with a temperature transmitter 215 and a pressure transmitter 216. The flow transmitter 214 (equipped with a flow display 213 and a flow accumulator 212) is used to display the real-time flow rate and the cumulative flow rate. The associated gas then flows through the frequency converter shut-off valve 29 and the one-way valve 27, and the control algorithm (such as feedforward compensation) is optimized to improve the response speed. In addition, a flame arrester 26 is installed before the associated gas enters the flare burner. The first and second pipelines in the safety emission assembly 1 converge and ultimately connect to the flare burner. The third pipeline also connects directly to the flare burner. The first and second pipelines are redundant, ensuring that pressure can still be released through the backup path in the event of a failure of any safety valve. The normally open ball valve 12 of the first pipeline is used for pressure release under normal operating conditions, while the normally closed ball valve 15 of the second pipeline is used to provide isolation for maintenance or equipment switching. The reducing fittings at the outlets of both the normally open ball valve 12 and the normally closed ball valve 15 are used to match the emission capacity of different pipe diameters and reduce local resistance (pressure drop needs to be ≤3% of rated pressure).

[0019] It should be noted that the wire mesh demister 33, vortex breaker 311, flare burner, reducer, valve, and components mentioned above are all applications of existing technology.

[0020] The above description is merely a preferred embodiment of the present invention and is not intended to limit the scope of the invention. All equivalent changes and modifications made in accordance with the scope of the claims of this invention should fall within the technical scope of this invention.

Claims

1. A degassing skid system for oil fields, characterized in that: The system includes a degassing tank (3), a safety discharge assembly (1), an exhaust assembly (2), a liquid discharge assembly (6), a first level gauge (4), and a second level gauge (5). The safety discharge assembly (1) and the exhaust assembly (2) are connected to the top of the degassing tank (3) through a safety valve pipeline and an associated gas pipeline, respectively. The liquid discharge assembly (6) is connected to the bottom of the degassing tank (3) through a liquid outlet pipeline. The first level gauge (4) and the second level gauge (5) are respectively installed on the outside of the side wall of the degassing tank (3).

2. The degassing skid system for oilfields according to claim 1, characterized in that: The safety emission assembly (1) includes three pipelines, namely the first pipeline, the second pipeline and the third pipeline. The first pipeline and the second pipeline are connected in parallel and then converge, and are located on two side roads respectively and are directly connected to safety valves. The first pipeline is equipped with a normally open ball valve one (12), and the second pipeline is equipped with a normally closed ball valve two (15). At the outlet of the normally open ball valve one (12), a reducing joint, a spring safety valve one (11) and a normally open ball valve three (18) are arranged in sequence. At the outlet of the normally closed ball valve two (15), a reducing joint, a spring safety valve two (16) and a normally open ball valve two (17) are arranged in sequence. The third pipeline is located in the middle road and is independent. The third pipeline is equipped with a normally closed ball valve one (14) and a normally closed stop valve one (13) in sequence.

3. The degassing skid system for oilfields according to claim 2, characterized in that: The exhaust assembly (2) includes a central regulating pipe, a first bypass pipe, and a second bypass pipe. The central regulating pipe is a straight pipe (217) and is sequentially equipped with a normally open ball valve four (21), an ultrasonic flow meter (23), a normally open ball valve seven (211), a normally open ball valve six (210), a frequency converter shut-off valve (29), a normally open ball valve five (28), a one-way valve one (27), and a flame arrester (26). The ultrasonic flow meter (23) is equipped with a corresponding flow transmitter (214) and a temperature transmitter. The transmitter (215) and pressure transmitter (216) are provided. The first bypass line is provided with a normally closed ball valve three (22). The first bypass line starts at the inlet of the normally open ball valve four (21) and ends at the outlet of the normally open ball valve seven (211). The second bypass line is provided with a normally closed ball valve four (24) and a normally closed shut-off valve two (25) in sequence. The second bypass line starts at the inlet of the normally open ball valve six (210) and ends at the outlet of the normally open ball valve five (28).

4. The degassing skid system for oilfields according to claim 3, characterized in that: The degassing tank (3) is a vertical container. The degassing tank (3) has a convex head at the top, a cylindrical body in the middle, and a skirt support at the bottom. The degassing tank (3) includes a tank body (31). A detachable wire mesh demister (33) is provided in the upper part of the tank body (31). An inlet pipe (34) is provided in the middle part of the tank body (31). A manhole (37) is provided on the tank wall in the middle part of the tank body (31). A sand flushing pipe (39) is provided in the lower part of the tank body (31). A vortex breaker (311) is provided in the lower part of the tank body (31) below the sand flushing pipe (39). The lower end of the vortex breaker (311) is connected to the outlet (313). An exhaust pipe (310) is provided on the side wall below the vortex breaker (311) in the lower part of the tank body (31). An inspection hole (312) is provided in the lower part of the tank body (31).

5. The degassing skid system for oilfields according to claim 4, characterized in that: The tank (31) is provided with a group of ports for assembling various components. The group of ports includes a pressure gauge port (32), a pressure transmitter port one (319), a pressure transmitter port two (317), a pressure transmitter port three (35), a temperature sensor port (38), a level gauge port one (315), a level gauge port two (314), and an air outlet (318). The pressure transmitter port one (319), the pressure transmitter port two (317), and the air outlet (318) are all located at the top of the tank (31). The pressure transmitter port three (35) is located below the wire mesh demister (33) and is ≥200mm away from the top of the tank (31). The temperature sensor port (38) is located in the middle of the tank (31) and above the sand flushing pipe (39). The level gauge port one (315) is located above the level gauge port two (314).

6. The degassing skid system for oilfields according to claim 5, characterized in that: The pipe assembly also includes a safety valve port (316), which is equipped with a safety valve or an emergency drain valve. The tank body (31) is equipped with a liquid level-pressure differential interlock. When the upper liquid level is ≥90% of the height of the tank body (31) and the gas pressure difference is ≥0.03MPa, the emergency drain valve is triggered to open.

7. The degassing skid system for oilfields according to claim 6, characterized in that: The drainage assembly (6) includes a central pipeline and a third bypass pipeline. The central pipeline is sequentially equipped with a normally open ball valve eight (63), a control valve group, a normally open ball valve eleven (615), a pneumatic shut-off valve (614), a normally open ball valve ten (613), a pneumatic shut-off valve (69), a one-way valve two (612), and a corrosion monitoring device. The control valve group is a digitally signal-controlled pneumatic ball valve. The control valve group includes a normally open ball valve nine (65) connected via a three-way valve (618) and a shut-off valve (69) with a handwheel. 4) and shut-off pilot valve (61), the shut-off valve (64) with handwheel is connected to a solenoid valve (62) and a position switch and indicator, a sampling port (66) is provided on the pipeline between the normally open ball valve nine (65) and the normally open ball valve eleven (615), the third bypass pipeline is provided with normally closed ball valve five (67) and normally closed shut-off valve three (68) in sequence, the third bypass pipeline starts at the inlet of the normally open ball valve eleven (615) and ends at the outlet of the normally open ball valve ten (613).

8. The degassing skid system for oilfields according to claim 7, characterized in that: The first level gauge (4) and the second level gauge (5) cover 0 to 80% of the height of the tank (31) below the liquid inlet pipe (34). The alarm thresholds of the first level gauge (4) and the second level gauge (5) are low liquid level ≤10% and high liquid level ≥70%. The accuracy of the first level gauge (4) and the second level gauge (5) is +1%FS. The first level gauge (4) and the second level gauge (5) cover 20% to 100% of the height of the tank (31) at the upper and lower ends. The alarm thresholds of the first level gauge (4) and the second level gauge (5) are upper liquid level ≤85% and lower liquid level ≥15%. The accuracy of the first level gauge (4) and the second level gauge (5) is +0.5%FS. The installation distance between the first level gauge (4) and the second level gauge (5) is upper and lower liquid level distance ≥1.5m.

9. The degassing skid system for oilfields according to claim 8, characterized in that: Both the first and second pipelines are equipped with branch lines, and each branch line is equipped with a normally closed ball valve, which can be used as a manual discharge or pressure test interface.

10. The degassing skid system for oilfields according to claim 3, characterized in that: The inlet pipe (34) is provided with an umbrella-shaped separation component (36).

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