Gas-liquid treatment control system for deepwater single-loop mixed transportation subsea pipeline pigging

Abstract

The utility model discloses a gas-liquid treatment control system for cleaning a deepwater single-loop mixed transportation sea pipeline, which comprises a gas treatment loop, a liquid treatment loop and a gas supply loop, the gas processing loop, the liquid processing loop and the gas supplementing loop are all connected to the slug flow catcher, the slug flow catcher is connected with a mixed transportation sea pipe, the end, away from the slug flow catcher, of the mixed transportation sea pipe is connected with an underwater wellhead and a ball serving cylinder, and a spherical pig in the ball serving cylinder moves along the mixed transportation sea pipe. And a pressure transmitter and a liquid level transmitter are arranged on the slug flow catcher, and both the pressure transmitter and the liquid level transmitter are connected with the progressive controller. According to the gas-liquid treatment control system for cleaning the deepwater single-loop mixed transportation sea pipeline, the liquid level and the liquid discharge amount of the slug flow catcher can be effectively maintained at fixed values during pipe cleaning, the operation pressure during slug flow long-distance liquid section treatment is effectively maintained and stabilized in the gas supplementing process, and the impact on a platform is reduced.

Description

Technical Field

[0001] The utility model belongs to the field of offshore oil engineering, and in particular relates to a gas-liquid processing control system for deepwater single-loop mixed transportation sea pipeline cleaning. Background Art

[0002] Deepwater submarine pipelines need to be cleaned regularly due to corrosion, flow assurance and management regulations. During the cleaning operation, the liquid trapped in the pipeline is pushed out by the cleaning ball, which will produce a long liquid section in the pipeline, causing the platform processing facilities to be cut off for a long time.

[0003] When the cleaning ball is carrying out cleaning operations, the platform processing facilities are cut off from gas for a long time, which has a serious impact on the platform's liquid processing system. The platform's liquid processing facilities have a small capacity, which leads to serious gas pressure buildup in the underwater production system. After the cleaning ball reaches the platform, the gas is released instantly, which has a great impact on the plug flow gas capture and downstream gas processing facilities.

[0004] Therefore, it is urgent to design a gas and liquid processing control system for deepwater single-loop mixed transportation pipeline cleaning to solve the above-mentioned deepwater single-loop mixed transportation pipeline cleaning problem. Utility Model Content

[0005] In order to solve the technical problems mentioned in the background technology that the platform processing facilities are cut off from gas for a long time, which has a serious impact on the platform liquid processing system, the gas phase is released instantly, and has a great impact on the slug flow gas capture and downstream gas phase processing facilities, a gas-liquid processing control system for deep-water single-loop mixed transportation pipeline cleaning is provided to solve the problem of deep-water single-loop mixed transportation pipeline cleaning.

[0006] In order to achieve the above-mentioned purpose, the specific technical scheme of the gas and liquid processing control system for deepwater single-loop mixed transmission sea pipeline pigging of the utility model is as follows:

[0007] A gas and liquid processing control system for deepwater single-loop mixed transport sea pipe cleaning comprises a gas processing circuit, a liquid processing circuit and an air supply circuit, wherein the gas processing circuit, the liquid processing circuit and the air supply circuit are all connected to a slug flow catcher, the slug flow catcher is connected to a mixed transport sea pipe, one end of the mixed transport sea pipe away from the slug flow catcher is respectively connected to an underwater wellhead and a ball launcher, a cleaning ball in the ball launcher moves along the mixed transport sea pipe, a pressure transmitter and a liquid level transmitter are arranged on the slug flow catcher, and the pressure transmitter and the liquid level transmitter are both connected to a progressive controller.

[0008] Furthermore, the mixed transport sea pipeline comprises a first pipeline and a second pipeline, the second pipeline is connected in parallel to the first pipeline, the first pipeline is provided with a first inlet regulating valve, and the second pipeline is provided with a second inlet regulating valve.

[0009] Furthermore, the first pipeline is connected to the slug flow catcher, one end of the first pipeline away from the slug flow catcher is connected to the underwater wellhead, the launching tube is connected to the first pipeline through a deepwater manifold, a first isolation valve is provided on the first pipeline, and a second isolation valve is provided on the deepwater manifold.

[0010] Furthermore, the liquid processing circuit includes a third pipeline and a fourth pipeline. The fourth pipeline is connected in parallel to the third pipeline. The third pipeline is provided with a first liquid outlet regulating valve and a flow transmitter. The fourth pipeline is provided with a second liquid outlet regulating valve.

[0011] Furthermore, the third pipeline is connected to the slug flow catcher, and one end of the third pipeline away from the slug flow catcher is connected to the liquid treatment device.

[0012] Furthermore, the slug flow collector is connected to the dry gas pipeline through a fifth pipeline to form an air supply loop, and an air supply regulating valve is provided on the fifth pipeline.

[0013] Furthermore, the slug flow collector is connected to the degassing processor through a sixth pipeline to form a gas processing loop, and a gas outlet regulating valve is provided on the sixth pipeline.

[0014] Furthermore, the pressure transmitter comprises a first pressure transmitter and a second pressure transmitter, the first pressure transmitter and the second pressure transmitter are both arranged on the slug flow catcher, and the second pressure transmitter is directly control-connected to the gas outlet regulating valve.

[0015] Furthermore, the progressive controller includes a first progressive controller, and the first progressive controller is connected to the first inlet regulating valve, the second inlet regulating valve, the first pressure transmitter and the liquid level transmitter respectively.

[0016] Furthermore, the progressive controller also includes a second progressive controller, and the second progressive controller is respectively connected to the liquid level transmitter, the flow transmitter, the first liquid outlet regulating valve and the second liquid outlet regulating valve.

[0017] The gas and liquid processing control system for deepwater single-loop mixed transmission sea pipeline pigging of the utility model has the following advantages:

[0018] The mixed transport sea pipe is connected with the slug flow catcher, and the gas treatment circuit, the liquid treatment circuit and the air supply circuit are connected to the slug flow catcher to realize the transportation and separation of the oil-gas-water mixture. A ball launcher is connected to the mixed transport sea pipe, and the pipe cleaning ball of the ball launcher performs pipe cleaning on the mixed transport sea pipe, and is controlled by a progressive controller. The pressure transmitter and the liquid level transmitter of the slug flow catcher are both connected to the progressive controller to realize the detection of the pressure and liquid level of the slug flow catcher during pipe cleaning, and then control the liquid level and liquid discharge of the slug flow catcher during pipe cleaning at a fixed value and an operating pressure value. The present application can effectively maintain the liquid level and liquid discharge of the slug flow catcher at a fixed value during pipe cleaning, effectively stabilize the operating pressure of the slug flow long-distance liquid section processing through the air supply process, reduce the impact of the long-distance single sea pipe cleaning liquid on the platform processing facilities, and avoid the shutdown of equipment and facilities caused by high-pressure gas through the forced return logic, ensure the safe and stable operation of the pipe cleaning operation, and reduce the project development investment. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 It is a schematic diagram of a gas-liquid processing control system for deepwater single-loop mixed transmission sea pipeline pigging according to the utility model.

[0020] Description of the markings in the figure:

[0021] 1. Slug catcher; 2. Underwater wellhead; 3. Ball launcher; 4. Direct control; 5. Liquid level transmitter; 6. First pipeline; 7. Second pipeline; 8. Third pipeline; 9. Fourth pipeline; 10. Fifth pipeline; 11. Sixth pipeline; 12. First inlet regulating valve; 13. Second inlet regulating valve; 14. Deepwater manifold; 15. First isolation valve; 16. Second isolation valve; 17. First liquid outlet regulating valve; 18. Second liquid outlet regulating valve; 19. Flow transmitter; 20. Liquid treatment device; 21. Dry gas pipeline; 22. Gas treatment device; 23. Gas supply regulating valve; 24. Gas outlet regulating valve; 25. First pressure transmitter; 26. Second pressure transmitter; 27. First progressive controller; 28. Second progressive controller; 29. ​​Deepwater manifold; 30. Subsea pipeline; 31. Shallow water platform. DETAILED DESCRIPTION

[0022] In order to make the purpose, technical solution and advantages of the embodiment of the utility model clearer, the technical solution in the embodiment of the utility model will be clearly and completely described below in conjunction with the drawings in the embodiment of the utility model. Obviously, the described embodiment is a part of the embodiment of the utility model, not all the embodiments. Based on the embodiment of the utility model, all other embodiments obtained by those skilled in the art without creative work are within the scope of protection of the utility model.

[0023] Those skilled in the art will appreciate that, although some embodiments herein include certain features included in other embodiments but not other features, the combination of features of different embodiments is meant to be within the scope of the present invention and form different embodiments. For example, in the claims, any one of the claimed embodiments may be used in any combination.

[0024] Please refer to the attached Figure 1 The utility model describes a gas and liquid processing control system for deepwater single-loop mixed transmission sea pipeline pigging.

[0025] like Figure 1 As shown, the gas-liquid processing control system for deepwater single-loop mixed sea pipeline cleaning in the utility model comprises a gas processing circuit, a liquid processing circuit and an air supply circuit, wherein the gas processing circuit, the liquid processing circuit and the air supply circuit are all connected to the slug flow catcher 1, the slug flow catcher 1 is connected to the mixed sea pipeline, the end of the mixed sea pipeline away from the slug flow catcher is respectively connected to the underwater wellhead 2 and the ball launcher 3, the cleaning ball in the ball launcher 3 moves along the mixed sea pipeline, the slug flow catcher 1 is provided with a pressure transmitter and a liquid level transmitter 5, and the pressure transmitter and the liquid level transmitter 5 are both connected to the progressive controller.

[0026] The mixed transport sea pipe is connected with the slug flow catcher 1, and the gas processing circuit, the liquid processing circuit and the air supply circuit are connected to the slug flow catcher 1 to realize the transportation and separation of the oil-gas-water mixture. A ball launcher 3 is connected to the mixed transport sea pipe, and the cleaning ball of the ball launcher 3 performs cleaning treatment on the mixed transport sea pipe, and is controlled by a progressive controller. The pressure transmitter and the liquid level transmitter 5 of the slug flow catcher 1 are both connected to the progressive controller to realize the detection of the pressure and liquid level of the slug flow catcher 1 during cleaning, and then control the liquid level and liquid discharge of the slug flow catcher 1 during cleaning at a fixed value and an operating pressure value. The present application can effectively maintain the liquid level and liquid discharge of the slug flow catcher 1 at a fixed value during cleaning, effectively stabilize the operating pressure during the long-distance liquid segment processing of the slug flow through the air supply process, reduce the impact of the long-distance single sea pipe cleaning liquid on the platform processing facilities, and avoid the shutdown of equipment and facilities caused by high-pressure gas through the forced return logic, ensure the safe and stable operation of the cleaning operation, and reduce the project development investment.

[0027] Further, if Figure 1 As shown, the mixed transport sea pipeline includes a first pipeline 6 and a second pipeline 7, the second pipeline 7 is connected in parallel to the first pipeline 6, a first inlet regulating valve 12 is provided on the first pipeline 6, and a second inlet regulating valve 13 is provided on the second pipeline 7; the first pipeline 6 is connected to the slug flow catcher 1, and one end of the first pipeline 6 away from the slug flow catcher 1 is connected to the underwater wellhead 2, the launching tube 3 is connected to the first pipeline 6 through a deepwater manifold 14, a first isolation valve 15 is provided on the first pipeline 6, and a second isolation valve 16 is provided on the deepwater manifold 14.

[0028] In this embodiment, a first inlet regulating valve 12 is provided on the first pipeline 6, a second inlet regulating valve 13 is provided on the second pipeline 7, and the second pipeline 7 is connected in parallel to the first pipeline 6. The slug flow catcher 1 is connected to the underwater wellhead 2 through the first pipeline 6, and the underwater wellhead 2 transports the oil-gas-water mixture to the slug flow catcher 1 through the first pipeline 6, and by controlling the opening or closing of the first inlet regulating valve 12 and the second inlet regulating valve 13, the oil-gas-water mixture is selected to flow into the slug flow catcher 1 through the first pipeline 6 or the second pipeline 7.

[0029] A first isolation valve 15 is provided on the first pipeline 6, and the isolation of the oil-gas-water mixture is achieved by controlling the opening or closing of the first isolation valve 15; the ball launcher 3 is connected to the first pipeline 6 through the deepwater manifold 14, and the cleaning ball is launched from the ball launcher 3 to clean the sea pipe. A second isolation valve 16 is provided on the deepwater manifold 14, and the isolation of the cleaning ball is achieved by controlling the opening or closing of the second isolation valve 16.

[0030] Further, if Figure 1 As shown, the liquid processing circuit includes a third pipeline 8 and a fourth pipeline 9, the fourth pipeline 9 is connected in parallel to the third pipeline 8, the third pipeline 8 is provided with a first liquid outlet regulating valve 17 and a flow transmitter 19, and the fourth pipeline 9 is provided with a second liquid outlet regulating valve 18; the third pipeline 8 is connected to the slug flow catcher 1, and the end of the third pipeline 8 away from the slug flow catcher 1 is connected to the liquid treatment device 20; the slug flow catcher 1 is connected to the dry gas pipeline 21 through the fifth pipeline 10 to form an air supply circuit, and the fifth pipeline 10 is provided with an air supply regulating valve 23; the slug flow catcher 1 is connected to the gas treatment device 22 through the sixth pipeline 11 to form a gas processing circuit, and the sixth pipeline 11 is provided with a gas outlet regulating valve 24.

[0031] In this embodiment, the slug flow collector 1 is connected to a third pipeline 8, the third pipeline 8 is connected in parallel with a fourth pipeline 9, the third pipeline 8 is provided with a first liquid outlet regulating valve 17, and the fourth pipeline 9 is provided with a second liquid outlet regulating valve 18. By controlling the first liquid outlet regulating valve 17 and the second liquid outlet regulating valve 18, the discharge of pure liquid is achieved.

[0032] Preferably, the pure liquid is located in the lower layer inside the slug flow catcher 1, so the third pipe 8 is connected to the lower side of the outer wall of the slug flow catcher 1 to facilitate the discharge of the pure liquid and effectively maintain the pressure of the slug flow catcher 1 during the long-distance liquid segment treatment period.

[0033] The slug catcher 1 serves to temporarily store the oil-gas-water mixture and regulate the pressure generated during production and cleaning of the sea pipe. The slug catcher 1 is connected to the dry gas pipeline 21 through the fifth pipeline 10. When cleaning the sea pipe, the slug catcher 1 is replenished with gas to adjust the pressure balance inside and outside the slug catcher 1. The fifth pipeline 10 is provided with a gas replenishment regulating valve 23. By controlling the opening or closing of the gas replenishment regulating valve 23, the function of whether to replenish gas into the slug catcher 1 is realized; the slug catcher 1 is connected to the degassing processor 22 through the sixth pipeline 11. When the oil-water mixture enters the slug catcher 1, the gas is discharged along the sixth pipeline 11. The sixth pipeline 11 is provided with a gas outlet regulating valve 24. By controlling the opening or closing of the gas outlet regulating valve 24, the gas in the slug catcher 1 is discharged, which effectively stabilizes the liquid level of the slug catcher 1 and solves the problem of a large amount of liquid impacting the platform facilities and causing safety accidents during the long-distance pure liquid section processing.

[0034] Preferably, due to the different densities of the oil, gas and water mixture, pure liquid will gather on the lower side of the slug flow catcher 1, and gas will gather on the upper side of the slug flow catcher 1, so the fifth pipeline 10 and the sixth pipeline 11 are correspondingly connected to the outer wall on the upper side of the slug flow catcher 1, and the slug flow catcher 1 is treated with air replenishment or exhaust to ensure that the slug flow catcher 1 outputs pure liquid normally, and when cleaning the sea pipe, it is ensured that the operating pressure during long-distance liquid segment processing is effectively controlled by air replenishment, thereby reducing the impact of the long-distance single sea pipe cleaning liquid on the platform processing facilities.

[0035] Further, if Figure 1 As shown, the pressure transmitter includes a first pressure transmitter 25 and a second pressure transmitter 26, both of which are arranged on the slug flow collector 1, and the second pressure transmitter 26 is directly controlled and connected to the gas outlet regulating valve 24; the progressive controller includes a first progressive controller 27, and the first progressive controller 27 is respectively connected to the first inlet regulating valve 12, the second inlet regulating valve 13, the first pressure transmitter 25 and the liquid level transmitter 5; the progressive controller also includes a second progressive controller 28, and the second progressive controller 28 is respectively connected to the liquid level transmitter 5, the flow transmitter 19, the first liquid outlet regulating valve 17 and the second liquid outlet regulating valve 18.

[0036] In this embodiment, the first pressure transmitter 25 and the second pressure transmitter 26 are both arranged on the outer wall of the slug flow catcher 1, and the first pressure transmitter 25 and the second pressure transmitter 26 both monitor the pressure inside the slug flow catcher 1 tank in real time, and the second pressure transmitter 26 directly controls 4 and is connected to the gas outlet regulating valve 24, so that when the pressure of the slug flow catcher 1 changes, the opening or closing of the gas outlet regulating valve 24 is controlled by the second pressure transmitter 26.

[0037] The first progressive controller 27 is respectively controlled and connected with the first inlet regulating valve 12, the second inlet regulating valve 13, the first pressure transmitter 25 and the liquid level transmitter 5, so as to realize the linkage control relationship among the first inlet regulating valve 12, the second inlet regulating valve 13, the first pressure transmitter 25 and the liquid level transmitter 5; the second progressive controller 28 is respectively controlled and connected with the liquid level transmitter 5, the flow transmitter 19, the first liquid outlet regulating valve 17 and the second liquid outlet regulating valve 18, so as to realize the linkage control relationship among the liquid level transmitter 5, the flow transmitter 19, the first liquid outlet regulating valve 17 and the second liquid outlet regulating valve 18.

[0038] The working principle of the gas and liquid processing control system for deepwater single-loop mixed transmission sea pipeline pigging in the utility model is as follows:

[0039] During the cleaning operation, the first liquid to reach the platform is a mixture of oil, gas and water. The first progressive controller 27 selects the pressure control mode and direct control to control the slug catcher pressure to be stable at 8950 kPa. The second progressive controller 28 selects the liquid level control logic and controls the liquid level to be 1 m.

[0040] When the long-distance pure liquid section reaches the slug flow catcher 1, the liquid level sensor detects that the liquid level has risen to 1.5m, and the first progressive controller 27 selects the liquid level control mode to adjust the opening of the first inlet regulating valve 12 to stabilize the liquid level of the slug flow catcher 1 at 1.5m. When it is monitored that the opening of the first inlet regulating valve 12 is less than 20%, the second inlet regulating valve 13 is opened and the first inlet regulating valve 12 is closed, and the opening of the second inlet regulating valve 13 is continued to be adjusted by the liquid level control mode to maintain the liquid level at 1.5m. The air supply regulating valve 23 is opened to supply air and directly control 4 to stabilize the pressure of the slug flow catcher 1 at 8950kpa. When the flow transmitter 19 monitors the flow rate to reach 140m3 / h, the second progressive controller 28 selects the flow control mode to control the opening of the first liquid outlet regulating valve 17, and the slug flow discharge volume is maintained at 140m3 / h. When it is monitored that the opening of the first liquid outlet regulating valve 17 is higher than 80%, the second liquid outlet regulating valve 18 is opened and the first inlet regulating valve 17 is closed, and the opening of the second liquid outlet regulating valve 18 is continued to be adjusted by the flow control mode to maintain the slug flow discharge volume at 140m3 / h.

[0041] When the cleaning ball reaches the shallow water platform, that is, when the high-pressure gas reaches the shallow water platform, the first pressure transmitter 25 detects that the pressure rises to 9200kPa, and the first progressive controller 27 selects the pressure control mode, and the opening of the second inlet regulating valve 13 and the direct control 4 stabilize the pressure of the slug flow catcher 1 at 8950kPa. When the liquid level transmitter 5 detects that the liquid level of the slug flow catcher 1 is lower than 1m, the liquid level control mode is selected to adjust the opening of the second liquid outlet regulating valve 18 to stabilize the liquid level of the slug flow catcher 1 at 1m. Close the air supply regulating valve 23 to end the air supply process.

[0042] As a preferred embodiment, the operating pressure of the shallow water platform slug flow catcher 1 is 11MPa, the underwater gas field is allocated to produce 467×104Sm3 / d natural gas, 603m3 / d condensate, and 55m3 / d, and the ball is served through the underwater manifold ball serving tube 3, and the gas volume of the gas field is reduced to 200×104Sm3 / d after serving, and the ball is pushed. During the cleaning process, the long-distance liquid slug reaches the platform, and the gas supply regulating valve 23 of the fifth pipeline 10 of the slug flow catcher 1 is opened, the gas supply flow rate is 10000Sm3 / h, and the gas supply time is 12 hours. After the liquid level of the slug flow catcher 1 rises to 1.5m, the opening of the first inlet regulating valve 12 or the second inlet regulating valve 13 is controlled by the inlet, and the liquid level transmitter 5 is controlled to maintain the liquid level at 1.5m. When the flow rate of the third liquid outlet pipeline 8 reaches 140m3 / h, the first liquid outlet regulating valve 17 and the second liquid outlet regulating valve 18 of the liquid outlet are controlled by the flow transmitter 19. When the opening of the first inlet regulating valve 12 is less than 20%, it is switched to the second inlet regulating valve 13. When the opening of the first liquid outlet regulating valve 17 is greater than 80%, it is switched to the second liquid outlet regulating valve 18 to reduce the impact of the liquid on the platform during the cleaning process. When the cleaning ball reaches the platform, the high-pressure gas enters the slug flow catcher 1. When the pressure reaches 9200kPa, the first inlet regulating valve 12 or the second inlet regulating valve 13 is switched back to pressure control, and the opening of the first inlet regulating valve 12 or the second inlet regulating valve 13 is quickly adjusted to ensure stable and safe production.

[0043] The gas and liquid processing control system based on deepwater single-loop mixed pipeline cleaning, the utility model is connected with the slug flow catcher 1 through the mixed pipeline, and the gas processing circuit, the liquid processing circuit and the gas replenishing circuit are connected to the slug flow catcher 1 to realize the transportation and separation of the oil-gas-water mixture, a ball launcher 3 is connected to the mixed pipeline, the cleaning ball of the ball launcher 3 performs cleaning on the mixed pipeline, and is controlled by the first progressive controller 27 and the second progressive controller 28, the first pressure transmitter 25, the second pressure transmitter 26 and the liquid level transmitter 5 of the slug flow catcher 1 are respectively connected with the first progressive controller 27 and the second progressive controller 28, to realize the detection of the pressure and liquid level of the slug flow catcher 1 during the cleaning period, and then control the liquid level and liquid discharge of the slug flow catcher 1 during the cleaning period at a fixed value and an operating pressure value. The present application can effectively maintain the liquid level and liquid discharge of the slug flow catcher 1 at fixed values ​​during the pigging period, effectively stabilize the operating pressure during the long-distance liquid segment processing of the slug flow through the gas replenishment process, reduce the impact of the long-distance single sea pipeline pigging liquid on the platform processing facilities, and avoid the shutdown of equipment and facilities caused by high-pressure gas through the forced return logic, thereby ensuring the safe and stable operation of the pigging operation and reducing the project development investment.

[0044] Obviously, the above embodiments of the present invention are merely examples for clearly illustrating the present invention, and are not intended to limit the implementation methods of the present invention. For those skilled in the art, other different forms of changes or modifications can be made based on the above description. It is not necessary and impossible to list all implementation methods here. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of the present invention shall be included in the protection scope of the claims of the present invention.

Claims

1. A gas and liquid processing control system for deepwater single-loop mixed transportation sea pipeline pigging, characterized in that: It includes a gas processing circuit, a liquid processing circuit and an air supply circuit, which are all connected to a slug flow catcher, and a mixed transportation sea pipe is connected to the slug flow catcher. The end of the mixed transportation sea pipe away from the slug flow catcher is respectively connected to an underwater wellhead and a ball launcher, and a cleaning ball in the ball launcher moves along the mixed transportation sea pipe. A pressure transmitter and a liquid level transmitter are provided on the slug flow catcher, and the pressure transmitter and the liquid level transmitter are both connected to a progressive controller.

2. The gas and liquid processing control system for deepwater single-loop mixed transportation sea pipeline pigging according to claim 1 is characterized in that: The mixed transport sea pipeline comprises a first pipeline and a second pipeline, the second pipeline is connected in parallel to the first pipeline, the first pipeline is provided with a first inlet regulating valve, and the second pipeline is provided with a second inlet regulating valve.

3. The gas and liquid processing control system for deepwater single-loop mixed transportation sea pipeline pigging according to claim 2 is characterized in that: The first pipeline is connected to the slug flow catcher, and one end of the first pipeline away from the slug flow catcher is connected to the underwater wellhead. The launching tube is connected to the first pipeline through a deepwater manifold. A first isolation valve is provided on the first pipeline, and a second isolation valve is provided on the deepwater manifold.

4. The gas and liquid processing control system for deepwater single-loop mixed transportation sea pipeline pigging according to claim 1 is characterized in that: The liquid processing circuit comprises a third pipeline and a fourth pipeline. The fourth pipeline is connected in parallel to the third pipeline. The third pipeline is provided with a first liquid outlet regulating valve and a flow transmitter. The fourth pipeline is provided with a second liquid outlet regulating valve.

5. The gas and liquid processing control system for deepwater single-loop mixed transportation sea pipeline pigging according to claim 4 is characterized in that: The third pipeline is connected to the slug flow catcher, and one end of the third pipeline away from the slug flow catcher is connected to the liquid treatment device.

6. The gas and liquid processing control system for deepwater single-loop mixed transportation sea pipeline pigging according to claim 5 is characterized in that: The slug flow catcher is connected to the dry gas pipeline through the fifth pipeline to form an air supply loop, and the fifth pipeline is provided with an air supply regulating valve.

7. The gas and liquid processing control system for deepwater single-loop mixed transportation sea pipeline pigging according to claim 6 is characterized in that: The slug flow collector is connected to the degassing processor through a sixth pipeline to form a gas processing loop, and a gas outlet regulating valve is arranged on the sixth pipeline.

8. The gas and liquid processing control system for deepwater single-loop mixed transportation sea pipeline pigging according to claim 1 is characterized in that: The pressure transmitter comprises a first pressure transmitter and a second pressure transmitter. Both the first pressure transmitter and the second pressure transmitter are arranged on the slug flow catcher. The second pressure transmitter is directly control-connected with the gas outlet regulating valve.

9. The gas and liquid processing control system for deepwater single-loop mixed transportation sea pipeline pigging according to claim 1, characterized in that: The progressive controller comprises a first progressive controller, and the first progressive controller is respectively connected to the first inlet regulating valve, the second inlet regulating valve, the first pressure transmitter and the liquid level transmitter.

10. The gas and liquid processing control system for deepwater single-loop mixed transportation sea pipeline pigging according to claim 9, characterized in that: The progressive controller also includes a second progressive controller, which is respectively connected to the liquid level transmitter, the flow transmitter, the first liquid outlet regulating valve and the second liquid outlet regulating valve.

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