Deepwater multimode repeated production pigging ball serving system

Abstract

The utility model discloses a deepwater multi-mode repeated production pigging ball serving system which comprises a production logistics pigging ball serving loop, an ethylene glycol pigging ball serving loop and a support ship pigging ball serving loop. The production logistics pigging ball serving loop, the ethylene glycol pigging ball serving loop and the support ship pigging ball serving loop are all connected with the ball serving cylinder through pipelines, the pipelines are provided with isolating valves, pressure and temperature transmitters and ball serving isolating valves, the ball serving cylinder is connected with the shallow water platform so that pigging balls in the ball serving cylinder can move towards the shallow water platform, and the shallow water platform is connected with an underwater wellhead. And a spherical pig position transmitter is arranged between the underwater wellhead and the shallow water platform. According to the deepwater multi-mode repeated production pigging ball serving system, the production logistics pigging ball serving loop, the ethylene glycol pigging ball serving loop and the support ship pigging ball serving loop are connected to the ball serving cylinder, so that production pigging ball serving is conducted in three different modes, and selection is conducted according to actual operation conditions.

Description

Technical Field

[0001] The utility model belongs to the field of offshore petroleum engineering, and in particular relates to a deepwater multi-mode repeated production cleaning and launching system. Background Art

[0002] Pigging is one of the indispensable production operations for the production and operation of underwater production systems. For underwater production systems with single pipe tiebacks, only underwater pigging solutions can be used for production pigging. Therefore, deepwater production pigging and launching systems are becoming increasingly important for the development of deepwater oil and gas fields. For production pigging operations of underwater facilities with single sea pipe tiebacks in deepwater oil and gas fields, the current mainstream mode is to support ship launching pigging operations.

[0003] However, the pipeline cleaning operation launched by support vessels is more easily affected by sea conditions, and the operation window is relatively short, which greatly limits the operating time of offshore vessels. In addition, the cost of a single movement and recovery of such operation vessels is relatively high, which has a greater impact on the cost of pipeline cleaning.

[0004] Therefore, it is urgent to design a deepwater multi-mode repetitive production cleaning and launching system to solve the above-mentioned problems of supporting vessel launching and cleaning operations. Utility Model Content

[0005] In order to solve the technical problems mentioned in the background technology that the support vessel's ball-launching pipe cleaning operation is easily affected by sea conditions, the operating time of offshore ships is greatly limited, the cost of a single movement and recovery of the operating ship is high, and this has a great impact on the cost of pipe cleaning. A deep-water multi-mode repetitive production pipe cleaning launching system is provided to solve the problem of support vessel's ball-launching pipe cleaning operation.

[0006] In order to achieve the above-mentioned purpose, the specific technical scheme of the deepwater multi-mode repeated production pigging and launching system of the utility model is as follows:

[0007] A deepwater multi-mode repeatable production pigging and launching system comprises a production logistics pigging and launching circuit, an ethylene glycol pigging and launching circuit and a support vessel pigging and launching circuit. The production logistics pigging and launching circuit, the ethylene glycol pigging and launching circuit and the support vessel pigging and launching circuit are all connected to a launching barrel through a pipeline, an isolation valve, a pressure and temperature transmitter and a launching isolation valve are arranged on the pipeline, the launching barrel is connected to a shallow water platform so that the pigging ball in the launching barrel moves toward the shallow water platform, the shallow water platform is connected to an underwater wellhead, and a pigging ball position transmitter is arranged between the underwater wellhead and the shallow water platform.

[0008] Furthermore, the serving tube is provided with a serving pipeline, the serving pipeline is provided with a first isolation valve, the serving pipeline is connected to the supporting ship pipeline through a first connector, and the supporting ship pipeline is connected to the supporting ship serving pipeline.

[0009] Furthermore, the launching tube is connected to the first pipeline through a second connector, a sixth connector is provided between the first pipeline and the sea pipe, the sea pipe is connected to the shallow water platform, and the first pipeline is provided with a first pressure and temperature transmitter, a second isolation valve, a first pig position transmitter, a third isolation valve, a second pig position transmitter and a third pressure and temperature transmitter in sequence.

[0010] Furthermore, the underwater wellhead is connected to the second pipeline through a third connector, the second pipeline is connected to the first pipeline, a fourth isolation valve is provided on the second pipeline, and a production logistics jumper pipeline is provided between the third connector and the underwater wellhead.

[0011] Furthermore, a third pipeline is connected to the second pipeline connected to the underwater wellhead, and the third pipeline is connected to the ball-serving pipeline.

[0012] Furthermore, the third pipeline is connected to a fourth pipeline, the fourth pipeline is connected to an underwater ethylene glycol pipeline, and the fourth pipeline is provided with a fifth isolation valve, a lean glycol flowmeter and a check valve in sequence.

[0013] Furthermore, the underwater ethylene glycol pipeline is connected to the fourth pipeline through a fourth connector, and a lean ethylene glycol crossing pipeline is provided between the fourth connector and the underwater ethylene glycol pipeline.

[0014] Furthermore, a sixth isolation valve is provided between the fourth pipeline and the second pipeline, a regulating oil nozzle, a seventh isolation valve and a second pressure and temperature transmitter are provided on the third pipeline in sequence, and a fifth connector is provided between the third pipeline and the ball-serving pipeline.

[0015] Furthermore, the ball-serving barrel includes a first cleaning ball, a second cleaning ball, a third cleaning ball, a fourth cleaning ball, a fifth cleaning ball and a sixth cleaning ball, and the first cleaning ball, the second cleaning ball, the third cleaning ball, the fourth cleaning ball, the fifth cleaning ball and the sixth cleaning ball are respectively connected to a first ball-serving isolation valve, a second ball-serving isolation valve, a third ball-serving isolation valve, a fourth ball-serving isolation valve, a fifth ball-serving isolation valve and a sixth ball-serving isolation valve.

[0016] Furthermore, the first ball serving isolation valve, the second ball serving isolation valve, the third ball serving isolation valve, the fourth ball serving isolation valve, the fifth ball serving isolation valve and the sixth ball serving isolation valve are all connected to the ball serving pipeline, and the ball serving pipeline is also connected to a replacement valve, which is arranged between the second connector and the first ball serving isolation valve.

[0017] The deepwater multi-mode repeated production pigging and launching system of the utility model has the following advantages:

[0018] By connecting the production logistics pigging circuit, ethylene glycol pigging circuit and support vessel pigging circuit to the pigging tube, three different ways of production pigging can be realized, which can be selected according to the actual operating conditions. The three ways of pigging do not affect the normal production of the oil and gas field, and can effectively avoid the impact of sea conditions on production pigging operations. It can also reduce the number of times the support vessel is used to launch, reduce the mobilization cost of the support vessel, and reduce the cost of sea pipeline pigging operations. It can be extended to deep-water oil and gas field projects developed in a single sea pipeline mixed-phase transportation mode with deeper water depth and longer distance, and has broad application prospects. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 It is a schematic diagram of the deepwater multi-mode repeated production pigging and launching system of the utility model.

[0020] Description of the markings in the figure:

[0021] 1. Ball serving tube; 2. Shallow water platform; 3. Underwater wellhead; 4. Underwater glycol pipeline; 5. Support vessel pipeline; 6. Ball serving pipeline; 7. First isolation valve; 8. Second isolation valve; 9. Third isolation valve; 10. Fourth isolation valve; 11. Fifth isolation valve; 12. Sixth isolation valve; 13. Seventh isolation valve; 14. First connector; 15. Second connector; 16. Third connector; 17. Fourth connector; 18. Fifth connector; 19. Sixth connector; 20. Support vessel ball serving pipeline; 21. First pipeline; 22. Second pipeline; 23. Third pipeline; 24. Fourth pipeline; 25. Subsea pipeline; 26. First pressure and temperature transmitter; 27. Second Pressure and temperature transmitter; 28. Third pressure and temperature transmitter; 29. ​​First pig position transmitter; 30. Second pig position transmitter; 31. Production logistics jumper pipeline; 32. Lean glycol jumper pipeline; 33. Lean glycol flowmeter; 34. Check valve; 35. Regulating nozzle; 36. First pig; 37. Second pig; 38. Third pig; 39. Fourth pig; 40. Fifth pig; 41. Sixth pig; 42. First ball isolation valve; 43. Second ball isolation valve; 44. Third ball isolation valve; 45. Fourth ball isolation valve; 46. Fifth ball isolation valve; 47. Sixth ball isolation valve; 48. Replacement valve. 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 deepwater multi-mode repeated production pigging and launching system.

[0025] like Figure 1 As shown, the deepwater multi-mode repetitive production cleaning ball serving system in the utility model includes a production logistics cleaning ball serving circuit, an ethylene glycol cleaning ball serving circuit and a support vessel cleaning ball serving circuit. The production logistics cleaning ball serving circuit, the ethylene glycol cleaning ball serving circuit and the support vessel cleaning ball serving circuit are all connected to the serving tube 1 through a pipeline, and an isolation valve, a pressure and temperature transmitter and a serving isolation valve are provided on the pipeline. The serving tube 1 is connected to a shallow water platform 2 so that the cleaning ball in the serving tube 1 moves toward the shallow water platform 2. The shallow water platform 2 is connected to an underwater wellhead 3, and a cleaning ball position transmitter is provided between the underwater wellhead 3 and the shallow water platform 2. By connecting the production logistics pigging and launching loop, the glycol pigging and launching loop and the support vessel pigging and launching loop on the launching tube 1, three different ways of production pigging and launching can be realized, which can be selected according to the actual operating conditions. The three launching methods do not affect the normal production of the oil and gas field, can effectively avoid the influence of the sea conditions on the production pigging operation, and can reduce the number of launches using the support vessel, reduce the mobilization cost of the support vessel, and reduce the cost of the sea pipeline pigging operation. It can be extended to deep-water oil and gas field projects developed in a single sea pipeline mixed-phase transportation mode with deeper water depth and longer distance, and has broad application prospects.

[0026] Further, if Figure 1 As shown, the ball-serving cylinder 1 is provided with a ball-serving pipeline 6, on which a first isolating valve 7 is provided, and the ball-serving pipeline 6 is connected to the supporting ship pipeline 5 through a first connector 14, and the supporting ship pipeline 5 is connected to the supporting ship ball-serving pipeline 20; the ball-serving cylinder 1 is connected to the first pipeline 21 through a second connector 15, and a sixth connector 19 is provided between the first pipeline 21 and the sea pipe 25, and the sea pipe 25 is connected to the shallow water platform 2, and the first pipeline 21 is provided with a first pressure-temperature transmitter 26, a second isolating valve 8, a first pig position transmitter 29, a third isolating valve 9, a second pig position transmitter 30 and a third pressure-temperature transmitter 28 in sequence.

[0027] In this embodiment, a serving pipeline 6 is provided on the serving tube 1, and the serving pipeline 6 is connected to the supporting ship pipeline 5, and a first connector 14 is provided on the supporting ship pipeline 5, and the supporting ship pipeline 5 is connected to the serving pipeline 6 through the first connector 14, and the supporting ship pipeline 5 is connected to the supporting ship serving pipeline 20, so as to practice the supporting ship cleaning and serving operation; the first pressure and temperature transmitter 26 monitors the pressure in front of the ball when serving, and the third pressure and temperature transmitter 28 is used to monitor the pressure during product production.

[0028] One end of the ball launcher 1 is connected to a second connector 15, which is connected to the first pipeline 21 through the second connector 15, and the sea pipe 25 is connected to the first pipeline 21 through a sixth connector 19. The end of the sea pipe 25 away from the first pipeline 21 is connected to the shallow water platform 2. The first pipeline 21 is connected to a first pressure and temperature transmitter 26, a second isolation valve 8, a first pig position transmitter 29, a third isolation valve 9, a second pig position transmitter 30 and a third pressure and temperature transmitter 28 in sequence from the ball launcher 1 along the sea pipe 25.

[0029] Further, if Figure 1 As shown, the underwater wellhead 3 is connected to the second pipeline 22 through the third connector 16, the second pipeline 22 is connected to the first pipeline 21, the second pipeline 22 is provided with a fourth isolation valve 10, and a production logistics jumper pipeline 31 is provided between the third connector 16 and the underwater wellhead 3; the second pipeline 22 connected to the underwater wellhead 3 is connected to the third pipeline 23, and the third pipeline 23 is connected to the ball-serving pipeline 6; the third pipeline 23 is connected to the fourth pipeline 24, and the fourth pipeline 24 is connected to the underwater ethylene glycol pipeline 4, and the fourth pipeline 24 is provided with a fifth isolation valve 18, a lean ethylene glycol flowmeter 33 and a check valve 34 in sequence.

[0030] In this embodiment, the underwater wellhead 3 is connected to the second pipeline 22, and the underwater wellhead 3 is connected to the third connector 16, and the underwater wellhead 3 is connected to the second pipeline 22 through the third connector 16. The underwater wellhead 3 and the second pipeline 22 are connected to each other. The end of the second pipeline 22 away from the underwater wellhead 3 is connected to the first pipeline 21, and a fourth isolation valve 10 is arranged on the second pipeline 22 to control whether the second pipeline 21 is flowing, and a production logistics jumper line 31 is arranged between the third connector 16 and the underwater wellhead 3, so as to realize the production logistics ball cleaning and normal production.

[0031] A third pipeline 23 is connected to the second pipeline 22, and one end of the third pipeline 23 away from the second pipeline 22 is connected to the serving pipeline 6, and a fourth pipeline 24 is connected to the third pipeline 23, and one end of the fourth pipeline 24 away from the third pipeline 23 is connected to the underwater ethylene glycol pipeline 4, and the fourth pipeline 24 is sequentially connected to the fifth isolation valve 11, the lean ethylene glycol flowmeter 33 and the check valve 34.

[0032] Further, if Figure 1As shown, the underwater glycol pipeline 4 is connected to the fourth pipeline 24 through the fourth connector 17, and a lean glycol crossing pipeline 32 is provided between the fourth connector 17 and the underwater glycol pipeline 4; a sixth isolation valve 12 is provided between the fourth pipeline 24 and the second pipeline 22, and a regulating oil nozzle 35, a seventh isolation valve 13 and a second pressure and temperature transmitter 27 are provided on the third pipeline 23 in sequence, and a fifth connector 18 is provided between the third pipeline 23 and the serving pipeline 6, and the second pressure and temperature transmitter 27 is used to monitor the pressure during serving.

[0033] In this embodiment, the underwater ethylene glycol pipeline 4 is connected to the fourth connector 17, and the connection between the underwater ethylene glycol pipeline 4 and the fourth pipeline 24 is realized through the fourth connector 17, and a lean ethylene glycol crossing pipeline 32 is arranged between the fourth connector 17 and the underwater ethylene glycol pipeline 4, and a sixth isolation valve 12 is provided on the third pipeline 23 between the fourth pipeline 24 and the second pipeline 22 to realize the flow control of the third pipeline 23; the third pipeline 23 is connected with a regulating oil nozzle 35, a seventh isolation valve 13 and a second pressure and temperature transmitter 27 in sequence, the third pipeline 23 is connected to the serving pipeline 6, and the serving pipeline 6 is connected with a fifth connector 18, and the serving pipeline 6 is accurately connected with the third pipeline 23 through the fifth connector 18.

[0034] Further, if Figure 1 As shown, the ball-serving barrel 1 includes a first cleaning ball 36, a second cleaning ball 37, a third cleaning ball 38, a fourth cleaning ball 39, a fifth cleaning ball 40 and a sixth cleaning ball 41, and the first cleaning ball 36, the second cleaning ball 37, the third cleaning ball 38, the fourth cleaning ball 39, the fifth cleaning ball 40 and the sixth cleaning ball 41 are respectively connected with a first ball-serving isolation valve 42, a second ball-serving isolation valve 43, a third ball-serving isolation valve 44, a fourth ball-serving isolation valve 45, a fifth ball-serving isolation valve 46 and a sixth ball-serving isolation valve 47; the first ball-serving isolation valve 42, the second ball-serving isolation valve 43, the third ball-serving isolation valve 44, the fourth ball-serving isolation valve 45, the fifth ball-serving isolation valve 46 and the sixth ball-serving isolation valve 47 are all connected to the ball-serving pipeline 6, and the ball-serving pipeline 6 is also connected with a replacement valve 48, and the replacement valve 48 is arranged between the second connector 15 and the first ball-serving isolation valve 42.

[0035] In this embodiment, a first cleaning ball 36, a second cleaning ball 37, a third cleaning ball 38, a fourth cleaning ball 39, a fifth cleaning ball 40 and a sixth cleaning ball 41 are provided in the ball serving tube 1. The first cleaning ball 36, the second cleaning ball 37, the third cleaning ball 38, the fourth cleaning ball 39, the fifth cleaning ball 40 and the sixth cleaning ball 41 are correspondingly provided with a first ball serving isolation valve 42, a second ball serving isolation valve 43, a third ball serving isolation valve 44, a fourth ball serving isolation valve 45, a fifth ball serving isolation valve 46 and a sixth ball serving isolation valve 47 to achieve control over the ball serving.

[0036] The first ball serving isolation valve 42, the second ball serving isolation valve 43, the third ball serving isolation valve 44, the fourth ball serving isolation valve 45, the fifth ball serving isolation valve 46 and the sixth ball serving isolation valve 47 are all connected to the ball serving pipeline 6 at one end away from the ball serving tube 1, and a replacement valve 48 is provided between the second connector 15 and the first ball serving isolation valve 42 to block the seawater when the ball serving tube 1 is connected underwater through the second connector 15.

[0037] The working principle of the deepwater multi-mode repeated production pigging and launching system in the utility model is as follows:

[0038] When a support vessel is used for pigging and launching operations, the liquid of the support vessel passes through the support vessel pipeline 5, the first connector 14, the launching pipeline 6, the first isolation valve 7, the launching isolation valve, the second connector 15, the first pipeline 21, the first pressure and temperature sensor 26, the first pig position transmitter 29, the second isolation valve 8, the third isolation valve 9, the second pig position transmitter 30, the third pressure and temperature sensor 28, and the sixth connector 19. The logistics of the support vessel launches the ball through this circuit. When the first and second pig transmitters detect that the pig passes through, the first isolation valve 7, the launching isolation valve, the first pig position transmitter 29, the third isolation valve 9 and the regulating nozzle 35 of the launching process of the support vessel are closed to push the ball for production logistics and carry out normal production;

[0039] When the ethylene glycol pipeline is used for pigging and ball-serving operations, the ethylene glycol passes through the lean glycol jumper pipeline 32 connected to the underwater ethylene glycol pipeline 4 and the fourth connector 17, the fourth pipeline 24, the fifth isolation valve 11 located on the fourth pipeline 24, the lean glycol flowmeter 33, the check valve 34, the third pipeline 23 connected to the ball-serving barrel 1, the regulating nozzle 35, the seventh isolation valve 13, the second pressure and temperature transmitter 27, the fifth connector 18, the ball-serving pipeline 6, the ball-serving isolation valve, the second connector 15, the first pipeline 21, the first pressure and temperature transmitter 26, the first pig position transmitter 29, the second isolation valve 8, the third isolation valve 9, the second pig position transmitter 30, the third pressure and temperature transmitter 28, and the sixth connector 19, and the ethylene glycol is pigged and ball-served through this circuit. When the first and second pig ball transmitters detect that the pig ball has passed, the fifth isolation valve 11, the seventh isolation valve 13, the ball serving isolation valve, the third isolation valve 9 and the regulating nozzle 35 of the glycol ball serving process are closed to push the ball for production logistics and carry out normal production;

[0040] When the production logistics is used for pigging and ball launching, the production logistics is carried out through the production material jumper pipeline 31 of the underwater wellhead 3, the third connector 16, the second pipeline 22 for connecting the sea pipe 25, the third pipeline 23 for connecting the ball launching tube 1, the sixth isolation valve 12 located in the third pipeline 23, the regulating nozzle 35, the seventh isolation valve 13, the second pressure and temperature transmitter 27, the fifth connector 18, the ball launching pipeline 6, the ball launching isolation valve, the second connector 15, the first pipeline 21, the first pressure and temperature sensor 26, the first pigging ball position transmitter 29, the second isolation valve 8, the third isolation valve 9, the second pigging ball position transmitter 30, the third pressure and temperature sensor 28, and the sixth connector 19. When launching, the fourth isolation valve 10 needs to be closed to introduce the production logistics into the production logistics ball launching process to push the pigging ball into the sea pipe system. When the second pig ball transmitter 30 detects that the pig ball passes through, the fourth isolation valve 10 is opened, and the sixth isolation valve 12, the seventh isolation valve 13, the ball-isolating isolation valve, the second isolation valve 8, the third isolation valve 9 and the regulating nozzle 35 are closed to push the ball for production logistics and carry out normal production.

[0041] Based on the deepwater multi-mode repeated production pigging and launching system, the utility model realizes three different modes of production pigging and launching by connecting the production logistics pigging and launching circuit, the ethylene glycol pigging and launching circuit and the support ship pigging and launching circuit on the launching tube 1, which can be selected according to the actual operating conditions. The three launching modes do not affect the normal production of the oil and gas field, can effectively avoid the influence of the sea conditions on the production pigging operation, and can reduce the number of launches of the support ship, reduce the mobilization cost of the support ship, and reduce the cost of the sea pipe pigging operation. It can be extended to deepwater oil and gas field projects developed in the single sea pipe mixed phase transportation mode with deeper water depth and longer distance, and has broad application prospects.

[0042] 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 deepwater multi-mode repeated production pigging system, characterized in that: It includes a production logistics pigging and ball-serving circuit, an ethylene glycol pigging and ball-serving circuit and a support vessel pigging and ball-serving circuit. The production logistics pigging and ball-serving circuit, the ethylene glycol pigging and ball-serving circuit and the support vessel pigging and ball-serving circuit are all connected to the ball-serving barrel through pipelines. The pipelines are provided with isolation valves, pressure and temperature transmitters and ball-serving isolation valves. The ball-serving barrel is connected to a shallow water platform so that the pig in the ball-serving barrel moves toward the shallow water platform. The shallow water platform is connected to an underwater wellhead. A pig position transmitter is provided between the underwater wellhead and the shallow water platform.

2. The deepwater multi-mode repeated production pigging system according to claim 1 is characterized in that: The serving tube is provided with a serving pipeline, the serving pipeline is provided with a first isolation valve, the serving pipeline is connected to the supporting ship pipeline through a first connector, and the supporting ship pipeline is connected to the supporting ship serving pipeline.

3. The deepwater multi-mode repeated production pigging system according to claim 2 is characterized in that: The ball launcher is connected to the first pipeline through the second connector. A sixth connector is provided between the first pipeline and the sea pipeline. The sea pipeline is connected to the shallow water platform. The first pipeline is provided with a first pressure and temperature transmitter, a second isolation valve, a first pig position transmitter, a third isolation valve, a second pig position transmitter and a third pressure and temperature transmitter in sequence.

4. The deepwater multi-mode repeated production pigging system according to claim 1 is characterized in that: The underwater wellhead is connected to the second pipeline through the third connector, the second pipeline is connected to the first pipeline, a fourth isolation valve is arranged on the second pipeline, and a production logistics jumper pipeline is arranged between the third connector and the underwater wellhead.

5. The deepwater multi-mode repeated production pigging system according to claim 4 is characterized in that: The second pipeline connected to the underwater wellhead is connected with a third pipeline, and the third pipeline is connected to the ball-serving pipeline.

6. The deepwater multi-mode repeated production pigging system according to claim 5 is characterized in that: The third pipeline is connected to a fourth pipeline, which is connected to an underwater ethylene glycol pipeline. A fifth isolation valve, a lean glycol flowmeter and a check valve are arranged on the fourth pipeline in sequence.

7. The deepwater multi-mode repeated production pigging system according to claim 6 is characterized in that: The underwater ethylene glycol pipeline is connected to the fourth pipeline through a fourth connector, and a lean ethylene glycol crossing pipeline is arranged between the fourth connector and the underwater ethylene glycol pipeline.

8. The deepwater multi-mode repeated production pigging system according to claim 7 is characterized in that: A sixth isolating valve is arranged between the fourth pipeline and the second pipeline, a regulating oil nozzle, a seventh isolating valve and a second pressure and temperature transmitter are arranged in sequence on the third pipeline, and a fifth connector is arranged between the third pipeline and the ball-serving pipeline.

9. The deepwater multi-mode repeated production pigging system according to claim 1, characterized in that: The ball-serving barrel includes a first cleaning ball, a second cleaning ball, a third cleaning ball, a fourth cleaning ball, a fifth cleaning ball and a sixth cleaning ball, and the first cleaning ball, the second cleaning ball, the third cleaning ball, the fourth cleaning ball, the fifth cleaning ball and the sixth cleaning ball are respectively connected with a first ball-serving isolation valve, a second ball-serving isolation valve, a third ball-serving isolation valve, a fourth ball-serving isolation valve, a fifth ball-serving isolation valve and a sixth ball-serving isolation valve.

10. The deepwater multi-mode repeated production pigging system according to claim 9, characterized in that: The first ball-serving isolation valve, the second ball-serving isolation valve, the third ball-serving isolation valve, the fourth ball-serving isolation valve, the fifth ball-serving isolation valve and the sixth ball-serving isolation valve are all connected to the ball-serving pipeline, and the ball-serving pipeline is also connected to a replacement valve, which is arranged between the second connector and the first ball-serving isolation valve.

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