Remote control offshore unmanned platform positive and negative circulation well washing and killing system and process

Abstract

The invention discloses a remote control offshore unmanned platform positive and negative circulation well washing and killing system and process, the system comprises a water injection manifold, a killing manifold, a closed discharge manifold and a mixed transportation subsea pipeline, and a remote control hydraulic control ball valve group, a first remote control electric oil nozzle, a flowmeter and one or more pressure transmitters are sequentially arranged between the water injection manifold and the killing manifold; the well killing manifold is respectively connected with the well killing pump, the pressure relief pipeline and the Christmas tree service manifold, the pressure relief pipeline is connected with the closed discharge manifold, the Christmas tree service manifold is connected with the mixed transportation subsea pipeline, the pressure relief pipeline is suitable for remote opening and closing pressure relief, and the Christmas tree service manifold is suitable for remote control opening and closing of positive and negative circulation well washing and killing operation. According to the system, positive and reverse circulation well washing and killing, annulus fluid infusion, oil pipe positive extrusion and oil pipe seal examining operation can be remotely and rapidly carried out in a central processing platform (CEP) or an unmanned platform central control room, the technological process is simple, and operation is convenient.

Description

Technical Field

[0001] The present invention relates to the technical field of remote control of unmanned offshore platforms, and in particular to a forward and reverse circulation well washing and killing system and process for remotely controlling unmanned offshore platforms. Background Art

[0002] At present, newly built offshore oilfields are mainly developed in a cluster and intelligent manner, that is, the management and development mode of unmanned platforms under the central processing platform (CEP) is mainly adopted. Unmanned platforms are not designed to remotely and quickly start the positive and reverse circulation well washing and killing control process. When an oil well fails, it is necessary to carry out annular fluid replenishment, positive and reverse circulation well washing operations, or to cooperate with stationary tubing operations, it is necessary to carry out tubing positive squeezing operations, positive and reverse circulation well washing operations, or when moving tubing operations occur, well kicks and blowouts occur, and it is necessary to quickly start positive circulation or reverse circulation well killing operations. When the on-duty personnel cannot reach the scene for rapid disposal, the operator in the control room of the central processing platform needs to remotely start the unmanned platform's positive and reverse circulation well washing and killing control process, and needs to complete the unmanned platform's positive and reverse circulation well washing and killing operations intelligently, safely and efficiently as soon as possible. Therefore, the unmanned wellhead platform urgently needs a remote control offshore unmanned platform positive and reverse circulation well washing and killing system and process. Summary of the invention

[0003] The present invention provides a remote-controlled offshore unmanned platform forward and reverse circulation well washing and killing system and process to solve the problems raised in the above background technology.

[0004] To achieve the above objectives, this application provides the following technical solutions:

[0005] A remote-controlled forward and reverse circulation well washing and killing system for an unmanned offshore platform comprises a water injection manifold, a well killing manifold, a closed-discharge manifold and a mixed transport sea pipe, wherein a remote-controlled hydraulically controlled ball valve group, a first remote-controlled electric oil nozzle, a flow meter and one or more pressure transmitters are arranged in sequence between the water injection manifold and the well killing manifold, the well killing manifold is respectively connected to a well killing pump, a pressure relief pipeline and a Christmas tree service manifold, the pressure relief pipeline is connected to the closed-discharge manifold, the Christmas tree service manifold is connected to the mixed transport sea pipe, the pressure relief pipeline is suitable for remote opening and closing of pressure relief, and the Christmas tree service manifold is suitable for remote control of opening and closing of forward and reverse circulation well washing and killing operations.

[0006] Optionally, the pressure relief line includes a first remote-controlled electric ball valve and a first normally open ball valve which are arranged on the pressure relief pipe from upstream to downstream.

[0007] Optionally, the Christmas tree service manifold includes a first remote-controlled well safety valve, a second remote-controlled well safety valve, a first gate valve and a second gate valve, a second remote-controlled electric ball valve is provided upstream of the first gate valve, the second remote-controlled electric ball valve and the upstream of the first remote-controlled well safety valve are connected to the well killing manifold, one or more pressure transmitters and a second remote-controlled electric oil nozzle are provided downstream of the second remote-controlled well safety valve, one or more pressure transmitters and two parallel pipelines are provided downstream of the second gate valve, a normally closed ball valve and a normally closed stop valve are provided on one pipeline, a third remote-controlled electric ball valve, a constant pressure vent valve and a second normally open ball valve are provided on the other parallel pipeline, a first check valve is connected downstream of the second normally open ball valve and the normally closed stop valve, a second check valve is connected downstream of the first check valve and the second remote-controlled electric oil nozzle, and the second check valve is connected to the mixed transport sea pipeline through a multiphase flowmeter.

[0008] Optionally, the remote-controlled hydraulic ball valve group includes a first remote-controlled hydraulic ball valve and a second remote-controlled hydraulic ball valve arranged in sequence, a third normally open ball valve is arranged between the electric oil nozzle and the flow meter, and a third check valve and a fourth normally open ball valve are arranged in sequence between the flow meter and the pressure transmitter.

[0009] A process for remotely controlling the forward and reverse circulation well washing and killing system of the aforementioned unmanned offshore platform includes the following processes:

[0010] Remote start of annular fluid filling control operation and remote shutdown of annular fluid filling control operation;

[0011] Remote oil pipe positive squeeze control operation and remote shut-off oil pipe positive squeeze control operation;

[0012] Remote oil pipe sealing control operation and remote oil pipe sealing control operation;

[0013] Remote reverse circulation washing and well killing control operation and remote shutdown of reverse circulation washing and well killing control operation;

[0014] Remote positive circulation washing and well killing control operation and remote shutdown of positive circulation washing and well killing control operation.

[0015] Optionally, during the annular space replenishment control, the central processing platform remotely and manually opens the first remote-controlled hydraulic ball valve and the second remote-controlled hydraulic ball valve, slightly opens the first remote-controlled electric oil nozzle, manually opens the second remote-controlled electric ball valve, and adjusts the opening of the first remote-controlled electric oil nozzle according to the value displayed on the flow meter, and adjusts the annular space replenishment flow to the target flow; the central processing platform remotely and manually closes the first remote-controlled hydraulic ball valve and the second remote-controlled hydraulic ball valve, closes the second remote-controlled electric ball valve, opens the first remote-controlled electric ball valve on the pressure relief pipeline, monitors the pressure transmitter value upstream of the well killing manifold, and when the pressure drops to 0KPaG, closes the first remote-controlled electric ball valve on the pressure relief pipeline, and closes the first remote-controlled electric oil nozzle;

[0016] When the tubing is squeezed, the central processing platform remotely and manually opens the first remote control well safety valve, slightly opens the first remote control electric nozzle, manually opens the first remote control hydraulic ball valve and the second remote control hydraulic ball valve, and monitors the flow counter value and the pressure transmitter value upstream of the well killing manifold. When the flow shows 0m 3 / h, when the pressure reaches the required target pressure, the first remote-controlled well safety valve is closed; the central processing platform remotely and manually opens the first remote-controlled electric ball valve on the pressure relief pipeline, monitors the value of the pressure transmitter upstream of the well killing manifold, and when the pressure drops to 0KPaG, closes the first remote-controlled electric ball valve on the pressure relief pipeline and the first remote-controlled electric oil nozzle;

[0017] During the oil pipe sealing control, the central processing platform remotely and manually opens the first remote-controlled well safety valve on the Christmas tree service manifold, slightly opens the first remote-controlled electric nozzle, manually opens the first remote-controlled hydraulic ball valve and the second remote-controlled hydraulic ball valve, and monitors the flow meter value and the pressure transmitter value upstream of the well killing manifold. When the pressure reaches the required sealing target pressure, the first remote-controlled hydraulic ball valve and the second remote-controlled hydraulic ball valve are closed, and the pressure transmitter value upstream of the well killing manifold is monitored and recorded; the central processing platform remotely and manually opens the first remote-controlled electric ball valve on the pressure relief pipeline, monitors the pressure transmitter value upstream of the well killing manifold, and when the pressure drops to 0KPaG, the first remote-controlled electric ball valve on the pressure relief pipeline is closed, the first remote-controlled well safety valve on the Christmas tree service manifold is closed, and the first remote-controlled electric nozzle is closed.

[0018] Optionally, during reverse circulation washing and well killing control, the central processing platform remotely guides the target oil well into the multiphase flowmeter, manually closes the third remote-controlled electric ball valve, opens the second remote-controlled electric ball valve of the Christmas tree service manifold, slightly opens the first remote-controlled electric oil nozzle, manually opens the first remote-controlled hydraulic ball valve and the second remote-controlled hydraulic ball valve, and monitors the flow meter value and the pressure transmitter value upstream of the well killing manifold at this time; during reverse circulation washing and well killing, the washing and well killing flow rate is controlled to the target flow rate by adjusting the first remote-controlled electric oil nozzle. During reverse circulation washing and well killing, if there is an oil pressure increase, the oil pressure value is appropriately reduced by adjusting the second remote-controlled electric oil nozzle, and the wellhead is judged by monitoring the multiphase flow meter value. Return and formation leakage: when the multiphase flowmeter display is consistent with the well-killing manifold flowmeter display, it means that the inlet and outlet are balanced and there is no formation leakage; when the multiphase flowmeter display is lower than the well-killing manifold flowmeter value, it means that there is formation leakage; the central processing platform remotely exports the multiphase flowmeter of the target oil well, closes the first remote-controlled hydraulic ball valve and the second remote-controlled hydraulic ball valve, closes the second remote-controlled electric ball valve of the Christmas tree service manifold, manually opens the first remote-controlled electric ball valve on the pressure relief pipeline, monitors the pressure transmitter value upstream of the well-killing manifold, and when the pressure drops to 0KPaG, closes the first remote-controlled electric ball valve on the pressure relief pipeline, closes the first remote-controlled electric oil nozzle, and opens the third remote-controlled electric ball valve.

[0019] Optionally, during positive circulation washing and well killing control, the central processing platform remotely guides the target oil well into the multiphase flowmeter, manually closes the second remote-controlled well safety valve on the Christmas tree service manifold, opens the first remote-controlled well safety valve on the Christmas tree service manifold, slightly opens the first remote-controlled electric oil nozzle, manually opens the first remote-controlled hydraulic ball valve and the second remote-controlled hydraulic ball valve, monitors the flow meter display value and the pressure transmitter value upstream of the well killing manifold, and in the early stage of positive circulation washing and well killing, controls the washing and well killing flow to the target flow by adjusting the first remote-controlled electric oil nozzle. In the middle stage of positive circulation washing and well killing, since the set value of the constant pressure bleed valve is fixed, the casing pressure is observed through the pressure transmitter upstream of the third remote-controlled electric ball valve. If the casing pressure rises too fast, promptly reduce the first remote-controlled electric nozzle to control the rising trend of casing pressure. At this time, observe the multiphase flow meter value to maintain a stable working condition for positive circulation washing and well killing operations; the central processing platform remotely exports the multiphase flow meter of the target oil well, closes the first remote-controlled hydraulic ball valve and the second remote-controlled hydraulic ball valve, closes the first remote-controlled well safety valve on the Christmas tree service manifold, manually opens the first remote-controlled electric ball valve on the pressure relief pipeline, monitors the value of the pressure transmitter upstream of the well killing manifold, and when the pressure drops to 0KPaG, closes the first remote-controlled electric ball valve on the pressure relief pipeline, closes the first remote-controlled electric nozzle, and opens the second remote-controlled well safety valve on the Christmas tree service manifold.

[0020] Optionally, it also includes overpressure ESD protection logic. When the pressure transmitter upstream of the wellbore manifold reaches the high pressure shut-off value, the logic shutdown is triggered, and the first remote-controlled hydraulic ball valve and the second remote-controlled hydraulic ball valve are triggered to close, and the first remote-controlled electric ball valve on the pressure relief pipeline is opened to isolate the water injection power source and relieve the pressure of the process.

[0021] Optionally, it also includes ESD protection logic for the reverse circulation well washing and well killing operation control process flow and ESD protection logic for the positive circulation well washing and well killing operation control process flow; during the reverse circulation well washing and well killing, when the pressure transmitter upstream of the second remote-controlled electric oil nozzle reaches the high-high pressure shut-off value, the logic shutdown is triggered, and the first remote-controlled hydraulic ball valve and the second remote-controlled hydraulic ball valve are triggered to close, and the second remote-controlled electric ball valve of the oil production tree service manifold is triggered to close, and the first remote-controlled electric ball valve on the pressure relief pipeline is opened to isolate the water injection power source and relieve pressure on the process flow; during the positive circulation well washing and well killing, when the pressure transmitter upstream of the third remote-controlled electric ball valve reaches the high-high pressure shut-off value, the logic shutdown is triggered, and the first remote-controlled hydraulic ball valve and the second remote-controlled hydraulic ball valve are triggered to close, and the safety valve on the first remote-controlled well of the oil production tree service manifold is triggered to close, and the first remote-controlled electric ball valve on the pressure relief pipeline is opened to isolate the water injection power source and relieve pressure on the process flow.

[0022] In summary, the technical effects and advantages of the present invention are as follows: the present application can remotely and quickly perform forward and reverse circulation well washing and pressure relief, annulus fluid replenishment, tubing forward squeezing and tubing sealing inspection operations in the control room of the central processing platform (CEP) or unmanned platform, with a simple process flow and convenient operation. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present application. For those skilled in the art, other drawings can be obtained based on these drawings without paying any creative work.

[0024] Figure 1 It is a structural schematic diagram of a forward and reverse circulation well washing and killing system and process for a remotely controlled offshore unmanned platform in one embodiment of the present invention.

[0025] Among them: 1. First remote-controlled hydraulic ball valve; 2. Second remote-controlled hydraulic ball valve; 3. First remote-controlled electric oil nozzle; 4. Third normally open ball valve; 5. Flow meter; 6. Third check valve; 7. Fourth normally open ball valve; 8. First pressure transmitter; 9. Second pressure transmitter; 10. Well-killing pump; 11. Second normally closed ball valve; 12. Third normally closed ball valve; 13. First remote-controlled electric ball valve; 14. First normally open ball valve; 15. Second remote-controlled electric ball valve; 16. First gate valve; 17. First remote-controlled well safety valve ; 18. The third gate valve; 19. The fourth gate valve; 20. The remote-controlled well safety valve; 21. The third pressure transmitter; 22. The fourth pressure transmitter; 23. The second gate valve; 24. The fifth pressure transmitter; 25. The sixth pressure transmitter; 26. The third remote-controlled electric ball valve; 27. The constant-pressure air release valve; 28. The second normally open ball valve; 29. ​​The first normally closed ball valve; 30. The normally closed stop valve; 31. The first check valve; 32. The second check valve; 33. The remote-controlled electric nozzle; 34. The multiphase flow meter; 35. The normally closed gate valve. DETAILED DESCRIPTION

[0026] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0027] In addition, the technical features involved in the different embodiments of the present invention described below can be combined with each other as long as they do not conflict with each other.

[0028] This embodiment proposes a remote-controlled offshore unmanned platform forward and reverse circulation well washing and killing system. The process system includes an unmanned platform water injection manifold, a remote-controlled hydraulic ball valve, a remote-controlled electric ball valve, a normally open ball valve, a flow meter, multiple check valves, a remote-controlled electric oil nozzle, a well killing manifold, a remote-controlled well safety valve, a gate valve, a closed discharge manifold, a pressure transmitter, a constant pressure vent valve, a multiphase flow meter, etc.; the ESD control loop is composed of a pressure transmitter, a remote-controlled hydraulic ball valve, a remote-controlled electric ball valve and a PLC control logic. Under normal conditions, forward and reverse circulation well washing and killing, annular fluid replenishment, tubing positive squeezing and tubing sealing operations can be performed remotely and quickly in the central processing platform (CEP) or the control room of the unmanned platform. The process flow is simple and the operation is convenient. 。

[0029] Specifically, Figure 1As shown, the remote-controlled offshore unmanned platform forward and reverse circulation well washing and killing system includes a water injection manifold, a well killing manifold, a closed-discharge manifold and a mixed transport sea pipeline. A remote-controlled hydraulic ball valve group, a first remote-controlled electric oil nozzle 3, a flow meter 5 and one or more pressure transmitters (including a first pressure transmitter 8 and a second pressure transmitter 9 in this embodiment) are arranged in sequence between the water injection manifold and the well killing manifold. The well killing manifold is respectively connected to the well killing pump 10, the pressure relief pipeline and the Christmas tree service manifold, the pressure relief pipeline is connected to the closed-discharge manifold, the Christmas tree service manifold is connected to the mixed transport sea pipeline, the pressure relief pipeline is suitable for remote opening and closing of pressure relief, and the Christmas tree service manifold is suitable for remote control of opening and closing of forward and reverse circulation well washing and killing operations.

[0030] Optionally, the pressure relief line includes a first remote-controlled electric ball valve 13 and a first normally open ball valve 14 which are arranged on the pressure relief pipe from upstream to downstream.

[0031] Optionally, the Christmas tree service manifold includes a first remote-controlled well safety valve 17, a second remote-controlled well safety valve 20, a first gate valve 16, and a second gate valve 23. A second remote-controlled electric ball valve 15 is provided upstream of the first gate valve 16, and the second remote-controlled electric ball valve 15 and the upstream of the first remote-controlled well safety valve 17 are connected to the well killing manifold, and one or more pressure transmitters (the third pressure transmitter 21 and the fourth pressure transmitter 22 in this embodiment) and a second remote-controlled electric oil nozzle 33 are provided downstream of the second remote-controlled well safety valve 20, and one or more pressure transmitters (the fifth pressure transmitter 24 and the sixth pressure transmitter 25 in this embodiment) are provided downstream of the second gate valve 23. A pressure transmitter 25) and two parallel pipelines, one pipeline is provided with a first normally closed ball valve 29 and a normally closed stop valve 30 in sequence, the other parallel pipeline is provided with a third remote-controlled electric ball valve 26, a constant pressure vent valve 27 and a second normally open ball valve 28 in sequence, the second normally open ball valve 28 and the normally closed stop valve 30 are connected to the downstream of the first check valve 31 and the second remote-controlled electric nozzle 33, and the second check valve 32 is connected to the mixed transport sea pipeline through a multiphase flowmeter 34.

[0032] In this embodiment, the first remote control well safety valve 17 and the second remote control well safety valve 20 on the Christmas tree are improved compared with the existing Christmas tree settings, and the remaining first gate valve 16, third gate valve 18, fourth gate valve 19 and second gate valve 23 are not improved. The description is as follows:

[0033] First remote control well safety valve 17: The valve at this position of the existing Christmas tree is generally set to local manual control and cannot be remotely operated (the valve used in the prior art is such as the gate valve 16 in the example). After upgrading it to a remote control well safety valve, the valve can be remotely opened and closed, thereby completing the function of this example;

[0034] Second remote-controlled well safety valve 20: The valve at this position of the existing Christmas tree is generally set to local hydraulic control and cannot be remotely operated. After upgrading it to a remote-controlled well safety valve, the valve can be remotely opened and closed, thereby completing the function of this example.

[0035] Optionally, the remote-controlled hydraulic ball valve group includes a first remote-controlled hydraulic ball valve 1 and a second remote-controlled hydraulic ball valve 2, which are arranged in sequence, and a normally closed gate valve 35 is arranged between the first remote-controlled hydraulic ball valve 1 and the second remote-controlled hydraulic ball valve 2. A third normally open ball valve 4 is arranged between the electric oil nozzle and the flow meter 5, and a third check valve 6 and a fourth normally open ball valve 7 are arranged in sequence between the flow meter 5 and the pressure transmitter (the first pressure transmitter 8 in this embodiment).

[0036] Optionally, a second normally closed ball valve and a third normally closed ball valve are sequentially provided between the well killing pump 10 and the well killing manifold.

[0037] The process system of this embodiment can provide unmanned platform remote positive and reverse circulation well washing and pressure, annular space filling, tubing positive squeezing, tubing sealing inspection and other functions. The unmanned platform has matching water injection manifold, well killing manifold and closed-discharge manifold; it has matching wellhead control panel hydraulic oil system and power system, remote control electric ball valve, remote control electric oil nozzle, and the valve switch power source comes from the unmanned platform power system. The aforementioned remote-controlled hydraulic ball valve, remote-controlled electric ball valve, remote-controlled electric oil nozzle, and remote-controlled well safety valve all have remote control functions, and remote process switching can be achieved by controlling the switch of the above valves. Multiphase flowmeters and flowmeters are used to realize the medium flow monitoring in the functions of remote positive and reverse circulation well washing and pressure, annular space filling, tubing positive squeezing, tubing sealing inspection, etc., and further judge the operating status of the process flow function. The medium and power source used for the functions of remote positive and reverse circulation well washing and pressure, annular space filling, tubing positive squeezing, tubing sealing inspection and other functions of the unmanned platform are high-pressure water injection from the water injection manifold. After the unmanned platform remote positive and reverse circulation well washing and pressure relief, annular filling, tubing positive squeezing, tubing sealing inspection and other functional operations are completed or abnormally terminated, the process pressure is released to the closed discharge manifold. Remote control of hydraulic ball valves and remote control of well safety valves, the valve switch power source comes from the hydraulic oil system of the wellhead control panel. The process pressure of the unmanned platform can be remotely monitored by the pressure transmitter. The process is protected by the ESD control circuit. When the pressure of the monitoring system of the pressure transmitter monitoring system of the well washing and pressure relief well reaches the high-high shut-off value, the logic shutdown is triggered to isolate the water injection power source and relieve the pressure of the process.

[0038] This embodiment also provides a process for the aforementioned remote control of the forward and reverse circulation well washing and killing system of an unmanned offshore platform, including the following processes:

[0039] Remote start of annular fluid filling control operation and remote shutdown of annular fluid filling control operation;

[0040] Remote oil pipe positive squeeze control operation and remote shut-off oil pipe positive squeeze control operation;

[0041] Remote oil pipe sealing control operation and remote oil pipe sealing control operation;

[0042] Remote reverse circulation washing and well killing control operation and remote shutdown of reverse circulation washing and well killing control operation;

[0043] Remote positive circulation washing and well killing control operation and remote shutdown of positive circulation washing and well killing control operation;

[0044] Overvoltage ESD protection logic;

[0045] ESD protection logic of reverse circulation well washing and killing operation control process;

[0046] Positive cycle well washing and killing operation control process ESD protection logic.

[0047] Optionally, during annular filling control:

[0048] Remotely start the annular space filling control operation: the central processing platform remotely and manually opens the first remote-controlled hydraulic ball valve 1 and the second remote-controlled hydraulic ball valve 2, slightly opens the first remote-controlled electric oil nozzle 3, manually opens the second remote-controlled electric ball valve 15, and adjusts the opening of the first remote-controlled electric oil nozzle 3 according to the value displayed on the flow meter 5 to adjust the annular space filling flow to the target flow;

[0049] Remote closing of annular space filling control operation: the central processing platform remotely and manually closes the first remote-controlled hydraulic ball valve 1 and the second remote-controlled hydraulic ball valve 2, closes the second remote-controlled electric ball valve 15, opens the first remote-controlled electric ball valve 13 on the pressure relief pipeline, monitors the value of the pressure transmitter (the first pressure transmitter 8 and the second pressure transmitter 9) upstream of the well killing manifold, and when the pressure drops to 0KPaG, closes the first remote-controlled electric ball valve 13 on the pressure relief pipeline, and closes the first remote-controlled electric nozzle 3;

[0050] When the oil pipe is squeezed and controlled:

[0051] Remote tubing positive squeeze control operation: The central processing platform remotely and manually opens the first remote control well safety valve 17, slightly opens the first remote control electric nozzle 3, manually opens the first remote control hydraulic ball valve 1 and the second remote control hydraulic ball valve 2, and monitors the flow meter 5 value and the pressure transmitter (first pressure transmitter 8 and second pressure transmitter 9) upstream of the well killing manifold. When the flow shows 0m 3 / h, when the pressure reaches the required target pressure, the safety valve 17 on the first remote control well is closed;

[0052] Remote closing of oil pipe positive squeezing control operation: the central processing platform remotely and manually opens the first remote-controlled electric ball valve 13 on the pressure relief pipeline, monitors the value of the upstream pressure transmitter (the first pressure transmitter 8 and the second pressure transmitter 9) of the well killing manifold, and when the pressure drops to 0KPaG, closes the first remote-controlled electric ball valve 13 on the pressure relief pipeline and closes the first remote-controlled electric oil nozzle 3;

[0053] During the oil pipe seal inspection control,

[0054] Remote tubing seal inspection control operation: The central processing platform remotely and manually opens the first remote-controlled well safety valve 17 of the Christmas tree service manifold, slightly opens the first remote-controlled electric nozzle 3, and manually opens the first remote-controlled hydraulic ball valve 1 and the second remote-controlled hydraulic ball valve 2. At this time, the flow meter 5 value and the pressure transmitter (first pressure transmitter 8 and second pressure transmitter 9) upstream of the well killing manifold are monitored. When the pressure reaches the required seal inspection target pressure, the first remote-controlled hydraulic ball valve 1 and the second remote-controlled hydraulic ball valve 2 are closed, and the pressure transmitter (first pressure transmitter 8 and second pressure transmitter 9) upstream of the well killing manifold is monitored and recorded;

[0055] Remote closing of the oil pipe seal verification control operation: the central processing platform remotely and manually opens the first remote-controlled electric ball valve 13 on the pressure relief pipeline, monitors the value of the upstream pressure transmitter of the wellbore manifold (the first pressure transmitter 8 and the second pressure transmitter 9), and when the pressure drops to 0KPaG, closes the first remote-controlled electric ball valve 13 on the pressure relief pipeline, closes the first remote-controlled well safety valve 17 of the Christmas tree service manifold, and closes the first remote-controlled electric oil nozzle 3.

[0056] Optionally, during reverse circulation flushing and well killing control:

[0057] Remote reverse circulation washing and well killing control operation: The central processing platform remotely guides the target oil well into the multiphase flow meter 34, manually closes the third remote-controlled electric ball valve 26, opens the second remote-controlled electric ball valve 15 of the Christmas tree service manifold, slightly opens the first remote-controlled electric nozzle 3, manually opens the first remote-controlled hydraulic ball valve 1 and the second remote-controlled hydraulic ball valve 2, and monitors the flow meter 5 value and the pressure transmitter (first pressure transmitter 8 and second pressure transmitter 9) upstream of the well killing manifold during reverse circulation washing and well killing. , by adjusting the first remote-controlled electric oil nozzle 3, the washing and well-killing flow rates are controlled to the target flow rates. During the reverse circulation washing and well-killing period, if there is an oil pressure rise, the oil pressure value is appropriately reduced by adjusting the second remote-controlled electric oil nozzle 33. By monitoring the value of the multiphase flow meter 34, the wellhead return and formation leakage are judged. When the display of the multiphase flow meter 34 is consistent with that of the well-killing manifold flow meter 5, it indicates that the inlet and outlet are balanced and there is no formation leakage; when the display of the multiphase flow meter 34 is lower than the value of the well-killing manifold flow meter 5, it indicates that there is formation leakage;

[0058] Remote shutdown of reverse circulation washing and well killing control operations: the central processing platform remotely exports the target oil well to the multiphase flowmeter 34, closes the first remote-controlled hydraulic ball valve 1 and the second remote-controlled hydraulic ball valve 2, closes the second remote-controlled electric ball valve 15 on the Christmas tree service manifold, manually opens the first remote-controlled electric ball valve 13 on the pressure relief pipeline, monitors the pressure transmitter (first pressure transmitter 8 and second pressure transmitter 9) upstream of the well killing manifold, and when the pressure drops to 0KPaG, closes the first remote-controlled electric ball valve 13 on the pressure relief pipeline, closes the first remote-controlled electric oil nozzle 3, and opens the third remote-controlled electric ball valve 26.

[0059] Optionally, during positive cycle washing and well killing control:

[0060] Remote positive circulation washing and well killing control operation: The central processing platform remotely guides the target oil well into the multiphase flowmeter 34, manually closes the second remote-controlled well safety valve 20 on the Christmas tree service manifold, opens the first remote-controlled well safety valve 17 on the Christmas tree service manifold, slightly opens the first remote-controlled electric nozzle 3, manually opens the first remote-controlled hydraulic ball valve 1 and the second remote-controlled hydraulic ball valve 2, monitors the displayed value of the flowmeter 5 and the value of the pressure transmitter (the first pressure transmitter 8 and the second pressure transmitter 9) upstream of the well killing manifold, and positive circulation In the initial stage of well washing and well killing, the first remote-controlled electric nozzle 3 is adjusted to control the well washing and well killing flow rate to the target flow rate. In the middle stage of positive circulation well washing and well killing, since the set value of the constant pressure venting valve 27 is fixed, the casing pressure increase is observed through the pressure transmitter (the fifth pressure transmitter 24 and the sixth pressure transmitter 25) upstream of the third remote-controlled electric ball valve 26. If the casing pressure increases too fast, the first remote-controlled electric nozzle 3 is adjusted down in time to control the casing pressure increase trend. At this time, the value of the multiphase flow meter 34 is observed to maintain a stable working condition to perform positive circulation well washing and well killing operations;

[0061] Remote shutdown of positive circulation washing and well killing control operations: the central processing platform remotely exports the multiphase flowmeter 34 of the target oil well, closes the first remote-controlled hydraulic ball valve 1 and the second remote-controlled hydraulic ball valve 2, closes the first remote-controlled well safety valve 17 on the Christmas tree service manifold, manually opens the first remote-controlled electric ball valve 13 on the pressure relief pipeline, monitors the value of the pressure transmitter (first pressure transmitter 8 and second pressure transmitter 9) upstream of the well killing manifold, and when the pressure drops to 0KPaG, closes the first remote-controlled electric ball valve 13 on the pressure relief pipeline, closes the first remote-controlled electric oil nozzle 3, and opens the second remote-controlled well safety valve 20 on the Christmas tree service manifold.

[0062] Optionally, overpressure ESD protection logic: when the pressure transmitter (first pressure transmitter 8 and second pressure transmitter 9) upstream of the wellbore manifold reaches the high pressure shut-off value, the logic shutdown is triggered, and the first remote-controlled hydraulic ball valve 1 and the second remote-controlled hydraulic ball valve 2 are triggered to close, and the first remote-controlled electric ball valve 13 on the pressure relief pipeline is opened to isolate the water injection power source and relieve pressure on the process flow.

[0063] Optionally, the ESD protection logic of the reverse circulation well washing and killing operation control process flow: during the reverse circulation well washing and killing period, when the pressure transmitter (the third pressure transmitter 21 and the fourth pressure transmitter 22) upstream of the second remote-controlled electric nozzle 33 reaches the high-high pressure cut-off value, the logic cut-off is triggered, and at this time, the first remote-controlled hydraulic ball valve 1 and the second remote-controlled hydraulic ball valve 2 are triggered to close, and the second remote-controlled electric ball valve 15 of the Christmas tree service manifold is triggered to close, and the first remote-controlled electric ball valve 13 on the pressure relief pipeline is opened to isolate the water injection power source and relieve the pressure of the process flow;

[0064] ESD protection logic of the positive circulation well washing and pressure control process flow: During the positive circulation well washing and pressure control period, when the pressure transmitter (fifth pressure transmitter 24 and sixth pressure transmitter 25) upstream of the third remote-controlled electric ball valve 26 reaches the high-high pressure shut-off value, the logic shutdown is triggered, and the first remote-controlled hydraulic ball valve 1 and the second remote-controlled hydraulic ball valve 2 are triggered to close, and the first remote-controlled well safety valve 17 on the Christmas tree service manifold is triggered to close, and the first remote-controlled electric ball valve 13 on the pressure relief pipeline is opened to isolate the water injection power source and relieve the pressure of the process flow.

[0065] This embodiment adds a remote annulus fluid replenishment control process. When the unmanned platform oil well has insufficient fluid supply, the remote annulus fluid replenishment control process can be started for the target oil well at the first time; adds a remote tubing positive squeezing control process. When the unmanned platform oil well needs tubing positive squeezing to perform Y-blocking sealing operation or tubing positive squeezing sealing verification operation, the remote tubing positive squeezing control process can be started for the target oil well at the first time; adds a remote reverse circulation washing and well killing control process. When the unmanned platform oil well needs to carry out reverse circulation washing and well killing operations, the remote reverse circulation washing and well killing control process can be started for the target oil well at the first time; adds a remote positive circulation washing and well killing control process. When the unmanned platform oil well needs to carry out positive circulation washing and well killing operations, the remote positive circulation washing and well killing control process can be started for the target oil well at the first time; adds a remote monitoring function of the annulus pressure of the positive, reverse circulation washing and well killing oil casing. When the target oil well of the unmanned platform is carrying out remote During forward and reverse circulation washing and well killing operations, the annular pressure of the casing and oil pipes is remotely monitored, and the washing and well killing flow rates are monitored. The casing pressure transmitter will transmit a high pressure alarm signal to the central control, and the central control personnel of the central processing platform can discover and remotely intervene in the process at the first time; increase the remote forward and reverse circulation washing and well killing ESD protection logic. When the unmanned platform target oil well is carrying out remote forward and reverse circulation washing and well killing operations, the annular pressure of the casing and oil pipe will alarm high or the back pressure transmitter will alarm high. The above two ESD alarm signals will be transmitted to the central control, triggering the logic shutdown to stop the forward and reverse circulation washing and well killing operations; increase the remote pressure relief control process. After completing the remote forward and reverse circulation washing and well killing operations, the electric ball valve of the pressure relief pipeline can be opened by remote control to perform pressure relief operations on the process flow from the unmanned platform water injection manifold to the well killing manifold section to ensure that the process pipeline does not experience pressure build-up after completing the pressure operation.

[0066] For ease of description, spatially relative terms such as "upper", "lower", "outer layer", "inner layer" and the like are used in the embodiments to illustrate the relationship of one element or feature shown in the figures relative to another element or feature. It should be understood that in addition to the orientation shown in the figures, the spatial terms are intended to include different orientations of the device in use or operation. Therefore, the exemplary term "lower" can include both upper and lower orientations.

[0067] Furthermore, relational terms such as "3" and "4" etc. are merely used to distinguish one component from another having the same name, but do not necessarily require or imply any such actual relationship or order between these components.

[0068] Although the preferred implementation cases of the present invention have been described above in conjunction with the accompanying drawings, the present invention is not limited to the above-mentioned specific implementation methods. The above-mentioned specific implementation methods are merely illustrative and not restrictive. Under the guidance of the present invention, ordinary technicians in this field can also make many forms of specific changes without departing from the scope of protection of the invention spirit and claims, which all fall within the scope of protection of the present invention.

Claims

1. A remote-controlled offshore unmanned platform forward and reverse circulation well washing and killing system, characterized in that: It comprises a water injection manifold, a well killing manifold, a closed-discharge manifold and a mixed transport sea pipeline. A remote-controlled hydraulic ball valve group, a first remote-controlled electric oil nozzle, a flow meter and one or more pressure transmitters are arranged in sequence between the water injection manifold and the well killing manifold. The well killing manifold is respectively connected with a well killing pump, a pressure relief pipeline and a Christmas tree service manifold. The pressure relief pipeline is connected with the closed-discharge manifold. The Christmas tree service manifold is connected with the mixed transport sea pipeline. The pressure relief pipeline is suitable for remote opening and closing of pressure relief. The Christmas tree service manifold is suitable for remote control of opening and closing of forward and reverse circulation well washing and killing operations.

2. The remote-controlled offshore unmanned platform forward and reverse circulation well washing and killing system according to claim 1 is characterized in that: The pressure relief pipeline includes a first remote-controlled electric ball valve and a first normally open ball valve which are arranged on the pressure relief pipe from upstream to downstream.

3. The remote-controlled offshore unmanned platform forward and reverse circulation well washing and killing system according to claim 1 is characterized in that: The Christmas tree service manifold includes a first remote-controlled well safety valve, a second remote-controlled well safety valve, a first gate valve and a second gate valve, a second remote-controlled electric ball valve is provided upstream of the first gate valve, the second remote-controlled electric ball valve and the upstream of the first remote-controlled well safety valve are connected to the well killing manifold, one or more pressure transmitters and a second remote-controlled electric oil nozzle are provided downstream of the second remote-controlled well safety valve, one or more pressure transmitters and two parallel pipelines are provided downstream of the second gate valve, a normally closed ball valve and a normally closed stop valve are provided on one pipeline, a third remote-controlled electric ball valve, a constant pressure vent valve and a second normally open ball valve are provided on the other parallel pipeline, a first check valve is connected downstream of the second normally open ball valve and the normally closed stop valve, a second check valve is connected downstream of the first check valve and the second remote-controlled electric oil nozzle, and the second check valve is connected to the mixed transport sea pipeline through a multiphase flowmeter.

4. The remote-controlled offshore unmanned platform forward and reverse circulation well washing and killing system according to claim 1 is characterized in that: The remote-controlled hydraulic ball valve group includes a first remote-controlled hydraulic ball valve and a second remote-controlled hydraulic ball valve which are arranged in sequence, a third normally open ball valve is arranged between the electric oil nozzle and the flow meter, and a third check valve and a fourth normally open ball valve are arranged in sequence between the flow meter and the pressure transmitter.

5. A process for remotely controlling the forward and reverse circulation well washing and killing system of an unmanned offshore platform as claimed in any one of claims 1 to 4, characterized in that: Including the following processes: Remote start of annular fluid filling control operation and remote shutdown of annular fluid filling control operation; Remote oil pipe positive squeeze control operation and remote shut-off oil pipe positive squeeze control operation; Remote oil pipe sealing control operation and remote oil pipe sealing control operation; Remote reverse circulation washing and well killing control operation and remote shutdown of reverse circulation washing and well killing control operation; Remote positive circulation washing and well killing control operation and remote shutdown of positive circulation washing and well killing control operation.

6. The process for remotely controlling the forward and reverse circulation well washing and killing system of an offshore unmanned platform according to claim 5 is characterized in that: During the annular space filling control, the central processing platform remotely and manually opens the first remote-controlled hydraulic ball valve and the second remote-controlled hydraulic ball valve, slightly opens the first remote-controlled electric oil nozzle, manually opens the second remote-controlled electric ball valve, and adjusts the opening of the first remote-controlled electric oil nozzle according to the value displayed on the flow meter, and adjusts the annular space filling flow to the target flow; the central processing platform remotely and manually closes the first remote-controlled hydraulic ball valve and the second remote-controlled hydraulic ball valve, closes the second remote-controlled electric ball valve, opens the first remote-controlled electric ball valve on the pressure relief pipeline, monitors the pressure transmitter value upstream of the well killing manifold, and when the pressure drops to 0KPaG, closes the first remote-controlled electric ball valve on the pressure relief pipeline and closes the first remote-controlled electric oil nozzle; When the tubing is squeezed, the central processing platform remotely and manually opens the first remote control well safety valve, slightly opens the first remote control electric nozzle, manually opens the first remote control hydraulic ball valve and the second remote control hydraulic ball valve, and monitors the flow counter value and the pressure transmitter value upstream of the well killing manifold. When the flow shows 0m 3 / h, when the pressure reaches the required target pressure, the first remote-controlled well safety valve is closed; the central processing platform remotely and manually opens the first remote-controlled electric ball valve on the pressure relief pipeline, monitors the value of the pressure transmitter upstream of the well killing manifold, and when the pressure drops to 0KPaG, closes the first remote-controlled electric ball valve on the pressure relief pipeline and the first remote-controlled electric oil nozzle; During the oil pipe sealing control, the central processing platform remotely and manually opens the first remote-controlled well safety valve on the Christmas tree service manifold, slightly opens the first remote-controlled electric nozzle, manually opens the first remote-controlled hydraulic ball valve and the second remote-controlled hydraulic ball valve, and monitors the flow meter value and the pressure transmitter value upstream of the well killing manifold. When the pressure reaches the required sealing target pressure, the first remote-controlled hydraulic ball valve and the second remote-controlled hydraulic ball valve are closed, and the pressure transmitter value upstream of the well killing manifold is monitored and recorded; the central processing platform remotely and manually opens the first remote-controlled electric ball valve on the pressure relief pipeline, monitors the pressure transmitter value upstream of the well killing manifold, and when the pressure drops to 0KPaG, the first remote-controlled electric ball valve on the pressure relief pipeline is closed, the first remote-controlled well safety valve on the Christmas tree service manifold is closed, and the first remote-controlled electric nozzle is closed.

7. The process for remotely controlling the forward and reverse circulation well washing and killing system of an offshore unmanned platform according to claim 5 is characterized in that: During reverse circulation washing and well killing control, the central processing platform remotely guides the target oil well into the multiphase flowmeter, manually closes the third remote-controlled electric ball valve, opens the second remote-controlled electric ball valve of the Christmas tree service manifold, slightly opens the first remote-controlled electric nozzle, manually opens the first remote-controlled hydraulic ball valve and the second remote-controlled hydraulic ball valve, and monitors the flow meter value and the pressure transmitter value upstream of the well killing manifold at this time; during reverse circulation washing and well killing, the washing and well killing flow is controlled to the target flow by adjusting the first remote-controlled electric nozzle. During reverse circulation washing and well killing, if there is an oil pressure increase, the oil pressure value is appropriately reduced by adjusting the second remote-controlled electric nozzle, and the wellhead return is judged by monitoring the multiphase flow meter value. and formation leakage. When the multiphase flowmeter display is consistent with the well-killing manifold flowmeter display, it means that the inlet and outlet are balanced and there is no formation leakage; when the multiphase flowmeter display is lower than the well-killing manifold flowmeter value, it means that there is formation leakage; the central processing platform remotely exports the multiphase flowmeter of the target oil well, closes the first remote-controlled hydraulic ball valve and the second remote-controlled hydraulic ball valve, closes the second remote-controlled electric ball valve of the Christmas tree service manifold, manually opens the first remote-controlled electric ball valve on the pressure relief pipeline, monitors the pressure transmitter value upstream of the well-killing manifold, and when the pressure drops to 0KPaG, closes the first remote-controlled electric ball valve on the pressure relief pipeline, closes the first remote-controlled electric oil nozzle, and opens the third remote-controlled electric ball valve.

8. The process for remotely controlling the forward and reverse circulation well washing and killing system of an offshore unmanned platform according to claim 5 is characterized in that: During positive cycle washing and well killing control, the central processing platform remotely guides the target oil well into the multiphase flowmeter, manually closes the second remote-controlled well safety valve on the Christmas tree service manifold, opens the first remote-controlled well safety valve on the Christmas tree service manifold, slightly opens the first remote-controlled electric nozzle, manually opens the first remote-controlled hydraulic ball valve and the second remote-controlled hydraulic ball valve, monitors the flow meter display value and the pressure transmitter value upstream of the well killing manifold, and in the early stage of positive cycle washing and well killing, controls the washing and well killing flow to the target flow by adjusting the first remote-controlled electric nozzle. In the middle stage of positive cycle washing and well killing, because the set value of the constant pressure vent valve is fixed, the casing pressure rise is observed through the pressure transmitter upstream of the third remote-controlled electric ball valve. If the casing pressure rises too fast, the first remote-controlled electric nozzle is promptly adjusted down to control the rising trend of casing pressure. At this time, the multiphase flow meter value is observed to maintain a stable working condition for positive circulation washing and well killing operations; the central processing platform remotely exports the multiphase flow meter of the target oil well, closes the first remote-controlled hydraulic ball valve and the second remote-controlled hydraulic ball valve, closes the first remote-controlled well safety valve on the Christmas tree service manifold, manually opens the first remote-controlled electric ball valve on the pressure relief pipeline, monitors the value of the pressure transmitter upstream of the well killing manifold, and when the pressure drops to 0KPaG, closes the first remote-controlled electric ball valve on the pressure relief pipeline, closes the first remote-controlled electric nozzle, and opens the second remote-controlled well safety valve on the Christmas tree service manifold.

9. The process for remotely controlling the forward and reverse circulation well washing and killing system of an offshore unmanned platform according to claim 5 is characterized in that: It also includes overpressure ESD protection logic. When the pressure transmitter upstream of the wellbore manifold reaches the high pressure shut-off value, the logic shutdown is triggered, at which time the first remote-controlled hydraulic ball valve and the second remote-controlled hydraulic ball valve are triggered to close, and the first remote-controlled electric ball valve on the pressure relief pipeline is opened to isolate the water injection power source and relieve the pressure on the process.

10. The process for remotely controlling the forward and reverse circulation well washing and killing system of an offshore unmanned platform according to claim 5, characterized in that: It also includes the ESD protection logic of the reverse circulation well washing and well killing operation control process flow and the ESD protection logic of the positive circulation well washing and well killing operation control process flow; during the reverse circulation well washing and well killing, when the pressure transmitter upstream of the second remote-controlled electric oil nozzle reaches the high-high pressure shut-off value, the logic shutdown is triggered, and the first remote-controlled hydraulic ball valve and the second remote-controlled hydraulic ball valve are triggered to close, and the second remote-controlled electric ball valve of the oil production tree service manifold is triggered to close, and the first remote-controlled electric ball valve on the pressure relief pipeline is opened to isolate the water injection power source and relieve pressure on the process flow; during the positive circulation well washing and well killing, when the pressure transmitter upstream of the third remote-controlled electric ball valve reaches the high-high pressure shut-off value, the logic shutdown is triggered, and the first remote-controlled hydraulic ball valve and the second remote-controlled hydraulic ball valve are triggered to close, and the safety valve on the first remote-controlled well of the oil production tree service manifold is triggered to close, and the first remote-controlled electric ball valve on the pressure relief pipeline is opened to isolate the water injection power source and relieve pressure on the process flow.

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