A distributed underwater wellhead completion and workover control system

Abstract

The present invention provides a distributed underwater wellhead completion control system, belonging to the field of marine oil and gas drilling and automated control technology. The system comprises an MCS master control station skid-mounted system, an HPU hydraulic power unit skid-mounted system, and underwater oil production equipment. The MCS master control station skid-mounted system is connected to the HPU hydraulic power unit skid-mounted system and the underwater oil production equipment via electro-hydraulic pipelines. The MCS master control station skid-mounted system is connected to the HPU hydraulic power unit skid-mounted system and the underwater oil production equipment to achieve communication. The MCS master control station skid-mounted system serves as a power supply and main control station for supplying power to the HPU hydraulic power unit skid-mounted system and the underwater oil production equipment. The HPU hydraulic power unit skid-mounted system serves as a hydraulic station for supplying a hydraulic source to the underwater oil production tree. The present invention can solve the problems of supplying power, hydraulic source, and positive pressure gas source in deepwater underwater production systems, and can realize data monitoring, recording, remote transmission, interaction, and power supply and control of underwater SCM deepwater control modules.

Description

Technical Field

[0001] The present invention belongs to the technical field of marine oil and gas drilling and production and automation control, and in particular relates to an underwater wellhead distributed completion and workover control system. Background Art

[0002] Currently, most MCS and HPU systems used in well completion operations are integrated, large, and heavy, making them inconvenient for on-site equipment placement and hoisting operations on offshore platforms. They also utilize a single power supply and are compatible with a single power supply system. PLC systems are mostly non-redundant, and the upper-level system network utilizes a star or daisy-chain design, resulting in poor reliability. The master server typically utilizes a conventional single-system design. This single-layer network, without isolation between the field equipment layer and the upper-level control layer, creates the potential for network storms. Furthermore, the MCS and HPU cannot operate independently, lacking the ability to synchronize ROV signals with the control system. Summary of the Invention

[0003] In view of this, the present invention aims to propose a distributed underwater wellhead completion and workover control system. This system can solve the problems of concentrated equipment risks and poor reliability in the use of underwater Christmas tree completion and workover control systems, which affect the normal operation of the entire system after a local failure. It also solves the problems of the MCS and HPU being unable to operate independently, being large in size, and being inconvenient for lifting and on-site deck layout. It can protect the working environment of personnel and equipment, realize data monitoring, recording, remote transmission, and interaction, and realize power supply and control of the underwater SCM deepwater control module.

[0004] To achieve the above objectives, the technical solution of the present invention is implemented as follows: a distributed underwater wellhead completion control system, comprising an MCS master control station skid-mounted system, an HPU hydraulic power unit skid-mounted system, and underwater oil production equipment; the MCS master control station skid-mounted system is connected to the HPU hydraulic power unit skid-mounted system and the underwater oil production equipment via electro-hydraulic pipelines; the MCS master control station skid-mounted system is connected to the HPU hydraulic power unit skid-mounted system and the underwater oil production equipment to achieve communication;

[0005] The MCS master control station skid-mounted system serves as a power supply and main control station, used to supply power to the HPU hydraulic power unit skid-mounted system and underwater oil production equipment; the HPU hydraulic power unit skid-mounted system serves as a hydraulic station, used to supply hydraulic source to the underwater oil production tree.

[0006] Furthermore, the underwater oil production equipment includes an underwater oil tree, an SCM underwater control module, a THRT tubing hanger running tool and a TH tubing hanger. The four items of equipment are placed at the underwater wellhead and are connected to the MCS master control station skid-mounted system and the HPU hydraulic power unit skid-mounted system through electro-hydraulic pipelines or umbilical cables.

[0007] Furthermore, an SPCU underwater power communication unit is provided inside the MCS master control station skid-mounted system. The SPCU underwater power communication unit and the SCM underwater control module are connected through an umbilical cable. At the same time, the SPCU underwater power communication unit realizes power supply and data communication for the SCM underwater control module.

[0008] Furthermore, the MCS master control station skid-mounted system includes a Christmas tree control mode and a string landing control mode.

[0009] Furthermore, the Christmas tree control mode is specifically as follows: the MCS master control station skid-mounted system realizes the opening or closing of the PMV production main valve, PWV production wing valve, AMV annular space main valve, AWV annular space wing valve, CIV chemical injection valve, XOV cross valve, and SCSSV ground control downhole safety valve on the underwater Christmas tree through data interactive control of the SPCU underwater power communication unit and the SCM underwater control module; the SPCU underwater power communication unit is used to monitor the PPTT production pressure and temperature transmitter on the production channel and the APTT pressure and temperature sensor on the annular channel through real-time communication with the SCM underwater control module;

[0010] The SPCU underwater power supply and communication unit is used to provide power and communication links to the SCM underwater control module. An online insulation monitoring device is installed on its output port to monitor the insulation resistance of the cable and the SCM underwater control module in real time. A cable-to-ground discharge circuit is provided at the output port of the SPCU underwater power supply and communication unit, which can manually discharge the power / communication cable to the ground;

[0011] The SPCU underwater power communication unit uses a redundant power supply plus power carrier to power and control the SCM underwater control module through an umbilical cable; the SCM underwater control module centrally collects data from underwater equipment and controls the movement of underwater equipment, realizing remote operation and fault diagnosis of underwater equipment.

[0012] Furthermore, the control mode of the landing string is specifically as follows: the MCS main control station skid system provides power and signals, and controls the HPU hydraulic power unit skid system through a series of pump groups. The HPU hydraulic power unit skid system controls the solenoid valves on the hydraulic circuit to realize the locking or unlocking operation of the THRT tubing hanger running tool and the TH tubing hanger, the locking or unlocking confirmation of the THRT tubing hanger running tool and the TH tubing hanger, the locking verification of the TH tubing hanger, the locking or unlocking operation of the TH tubing hanger and the underwater oil production tree, the locking or unlocking confirmation of the TH tubing hanger and the underwater oil production tree, the opening or closing operation of the UDF quick release frame and the SCSSV ground control subsea safety valve, and monitors the pressure and flow curves on the corresponding hydraulic circuit, and determines the action status of all valve switch states, valve flow and valve pressure.

[0013] Furthermore, the MCS master control station skid-mounted system adopts a positive pressure explosion-proof skid-mounted structure, including an EPU power subsystem, a CPFG positive pressure explosion-proof and fire and gas control subsystem, a PLC subsystem, an instrument subsystem, a communication network subsystem, an external control unit, and a SCADA data monitoring and acquisition subsystem, an ROV video access subsystem, an FGS fire and gas access subsystem, and a PAGA public broadcast alarm subsystem, among which the SCADA data monitoring and acquisition subsystem, the ROV video access subsystem, the FGS fire and gas access subsystem, and the PAGA public broadcast alarm subsystem are synchronous access systems that interact with the platform's security system.

[0014] Furthermore, the EPU power subsystem is used to realize power distribution of the MCS master control station skid-mounted system and the HPU hydraulic power unit skid-mounted system, including the platform main power supply, emergency power supply and built-in redundant UPS main power distribution system, emergency power distribution system, non-explosion-proof equipment power distribution system, main transformer and power distribution control circuit; the built-in redundant UPS power supply of the EPU power subsystem adopts a dual online UPS system, the battery pack adopts an explosion-proof structure, and is equipped with a battery pack H2 monitoring and emission system;

[0015] The CPFG positive pressure explosion protection and fire and gas control subsystem uses a redundant dual-fan configuration, namely a dual positive pressure fan skid system, which is used to provide clean air to the MCS master control station skid system. The dual positive pressure fan skid system has an automatic switching function. When one fan fails, the system will automatically switch to the other fan to maintain the positive pressure environment in the skid. The CPFG positive pressure explosion protection and firearm control subsystem uses a dual-use and one-backup redundant power supply configuration, which can automatically switch between the main and backup power supplies to realize power supply of the main power distribution system, the built-in redundant UPS power supply, and the emergency power distribution system.

[0016] The PLC control subsystem includes the MCS local PLC system and the HPU remote PLC system, which are used to realize on-site data collection of the HPU hydraulic power unit skid-mounted system and the MCS master control station skid-mounted system, remote control of the pump group of the HPU hydraulic power unit skid-mounted system, and monitoring of the SCM underwater control module. The SCM underwater control module is used to monitor the PPTT production pressure and temperature transmitters and the APTT pressure and temperature sensors, and the SCM underwater control module is used to control the valve switches to complete the control of each valve of the underwater oil production tree.

[0017] Furthermore, the instrument subsystem adopts a distributed layout and is respectively installed in the MCS master control station skid-mounted system and the HPU hydraulic power unit skid-mounted system. At the same time, the MCS local PLC system in the MCS master control station skid-mounted system serves as the control and operation center, and the HPU remote PLC system in the MCS master control station skid-mounted system and the HPU hydraulic power unit skid-mounted system serves as the data acquisition center to collect data from sensors and intelligent instruments inside and outside the skid, and then exchange data through the ring main unit inside the MCS master control station skid-mounted system and the HPU hydraulic power unit skid-mounted system;

[0018] The network communication subsystem adopts a double-layer ring TCP / IP network architecture. The upper system data exchange layer and the field instrument data exchange layer respectively form two interconnected ring networks to avoid network congestion caused by data storms between systems. Non-TCP / IP protocol field intelligent instruments can be connected to the single network port protocol expansion interface module under the field instrument network layer, which facilitates on-site networking and flexible selection of topology structure.

[0019] The external control unit includes a remote control station RCP, an external ESD emergency shutdown station and a platform DCS remote control station. The external ESD emergency shutdown station is used to remotely start the ESD emergency shutdown program; the platform DCS remote control station, the remote control station RCP and the local workstation can all realize remote data monitoring of underwater oil production equipment; and can switch the control source to avoid the control right competition problem caused by multiple control locations; the remote control station RCP is a mobile operation station, which adopts an explosion-proof integrated industrial computer and can be installed at any location within 100m of the MCS main control station skid-mounted system; the local workstation is placed in the MCS main control station skid-mounted system, which adopts a 2K high-definition display screen and can display multiple pictures in split screen; the remote control station RCP, the external ESD emergency shutdown station and the platform DCS remote control station all access the remote server through the C / S architecture, and switch operations through the remote / local switch of the external control unit.

[0020] Furthermore, the ROV video access subsystem can realize video sharing of underwater operation robots, making it easier for on-site operators to understand the underwater operation status in real time and access the drilling platform production system;

[0021] The FGS fire and gas access subsystem can achieve information sharing and synchronization with the platform fire and gas system to ensure the safety of operations and personnel;

[0022] The PAGA public address alarm subsystem is used to realize sharing with the platform broadcast, facilitating information communication between the MCS master control station skid-mounted system and the platform drilling floor and central control personnel;

[0023] The FGS fire and gas access subsystem and the PAGA public address alarm subsystem are both connected to the drilling platform safety production system.

[0024] Compared with the existing technology, the distributed underwater wellhead completion control system of the present invention has the following advantages:

[0025] (1) The distributed underwater wellhead completion control system of the present invention is an electric-hydraulic composite control system capable of simultaneously supplying power and hydraulic power to underwater oil production equipment;

[0026] (2) The present invention can not only control the opening and closing of each production valve on the underwater oil tree and monitor the production channel and the annular channel, but also control the THRT tubing hanger operating tool and the various actions of the TH tubing hanger, and monitor the pressure and flow curves on the corresponding hydraulic circuit;

[0027] (3) The SPCU underwater power supply and communication unit of the present invention is equipped with online insulation monitoring, which can manually discharge the power supply / communication cable to the ground;

[0028] (4) The SPCU underwater power communication unit of the present invention adopts a redundant power supply + power carrier mode to power and control the SCM underwater control module through the umbilical cable, which can realize remote operation and fault diagnosis of underwater equipment;

[0029] (5) The EPU power subsystem of the present invention can not only realize the power distribution of the MCS master control station skid-mounted system and the HPU hydraulic power unit skid-mounted system, but also the built-in redundant UPS power supply of the EPU power subsystem adopts a dual online UPS system;

[0030] (6) The CPFG positive pressure explosion-proof and fire and gas control subsystem of the present invention adopts a redundant dual-fan design with an automatic switching function. When one of the fans fails, the system will automatically switch to the other fan, which can effectively maintain the positive pressure environment in the skid;

[0031] (7) The CPFG positive pressure explosion-proof and fire and gas control subsystem of the present invention has a 2-for-1 redundant power supply design, which can automatically switch between the main and backup power supplies and has high reliability;

[0032] (8) The system PLC control subsystem described in the present invention is composed of the MCS local PLC system and the HPU remote PLC system, which can realize on-site data acquisition, remote control, monitoring and switch control;

[0033] (9) The instrument subsystem of the present invention adopts a distributed design to collect data from sensors and intelligent instruments inside and outside the skid. Through data interaction with the ring main cabinet, the collection end is closer to the equipment, reducing the cables and communication lines between the two systems, and effectively improving the reliability of the signal;

[0034] (10) The network communication subsystem of the present invention adopts a double-layer ring TCP / IP network architecture, which facilitates on-site networking and allows flexible selection of topology structures;

[0035] (11) The remote control station RCP, external ESD emergency shutdown station and platform remote control station in the external control unit of the present invention all access the remote server through the C / S architecture and are switched through the remote / local switch of the external control unit. Through network connection, the complexity of the system is effectively simplified.

[0036] (12) The PAGA public broadcast alarm subsystem described in the present invention can be shared with the platform broadcast, facilitating information communication between the MCS master control station skid-mounted system and the platform drilling floor, central control and other personnel;

[0037] (13) The FGS fire and gas access subsystem of the present invention can realize information sharing and synchronization with the platform fire and gas system, thereby effectively ensuring the safety of operations and personnel;

[0038] (14) The ROV video access subsystem described in the present invention can realize video sharing of underwater operation robots, making it easier for on-site operators to understand the underwater operation status in real time. BRIEF DESCRIPTION OF THE DRAWINGS

[0039] The accompanying drawings, which constitute part of the present invention, are provided to provide a further understanding of the present invention. The exemplary embodiments of the present invention and their descriptions are provided to explain the present invention and do not constitute an undue limitation of the present invention. In the accompanying drawings:

[0040] Figure 1 This is a schematic diagram of the distributed underwater wellhead completion and workover control system according to an embodiment of the present invention;

[0041] Figure 2 This is an overview of the Christmas tree control mode according to an embodiment of the present invention;

[0042] Figure 3 This is an overview of the control mode for landing the tubular column according to an embodiment of the present invention;

[0043] Figure 4 This is an overview of the MCS master control station skid-mounted system according to an embodiment of the present invention;

[0044] Figure 5 This is an overview of the EPU subsystem according to an embodiment of the present invention;

[0045] Figure 6 This is a schematic diagram of the CPFG positive pressure explosion protection and fire and gas control subsystem according to an embodiment of the present invention;

[0046] Figure 7 This is an overview of the PLC control subsystem according to an embodiment of the present invention;

[0047] Figure 8 This is an overview diagram of the instrument subsystem according to an embodiment of the present invention;

[0048] Figure 9 This is a schematic diagram of an external control unit according to an embodiment of the present invention. DETAILED DESCRIPTION

[0049] It should be noted that, in the absence of conflict, the embodiments of the present invention and the features therein may be combined with each other.

[0050] The present invention will be described in detail below with reference to the accompanying drawings and in conjunction with embodiments.

[0051] like Figures 1-9 As shown, the present invention is an underwater wellhead distributed completion and repair control system, which is an electric-hydraulic composite control system that can simultaneously supply power and hydraulic power to underwater oil production equipment, and can realize data monitoring, recording, remote transmission, interaction, and power supply and control of underwater SCM deepwater control modules.

[0052] 1. Power, hydraulic, and gas source supply: A distributed underwater wellhead workover control system includes an MCS master control station skid-mounted system, an HPU hydraulic power unit skid-mounted system, and underwater oil production equipment. The MCS master control station skid-mounted system is connected to the HPU hydraulic power unit skid-mounted system and the underwater oil production equipment through electro-hydraulic pipelines. The MCS master control station skid-mounted system is connected to the HPU hydraulic power unit skid-mounted system and the underwater oil production equipment to achieve communication.

[0053] The MCS master control station skid-mounted system serves as a power supply and main control station, used to supply power to the HPU hydraulic power unit skid-mounted system and underwater oil production equipment; the HPU hydraulic power unit skid-mounted system serves as a hydraulic station, used to supply hydraulic source to the underwater oil production tree.

[0054] The underwater oil production equipment includes an underwater oil tree, an SCM underwater control module, a THRT tubing hanger running tool and a TH tubing hanger. The four items of equipment are placed at the underwater wellhead and are connected to the MCS master control station skid-mounted system and the HPU hydraulic power unit skid-mounted system through electro-hydraulic pipelines or umbilical cables.

[0055] The MCS skid-mounted system is equipped with an SPCU underwater power and communication unit. The SPCU is connected to the SCM underwater control module via an umbilical cable and provides power and data communication for the SCM underwater control module. The SCM underwater control module is the control unit on the underwater Christmas tree. The SPCU is the power and communication unit in the MCS skid-mounted system that interfaces with the SCM underwater control module. The SCM underwater control module and the SPCU communicate via a power carrier, not wirelessly.

[0056] The MCS skid-mounted system includes both Christmas tree control and string placement control modes. It can not only control the opening and closing of production valves on the subsea Christmas tree and monitor the production and annular channels, but also control the THRT tubing hanger operating tools and various actions of the TH tubing hanger, as well as monitor the pressure and flow curves in the corresponding hydraulic circuits.

[0057] 2. In the Christmas tree working mode, the opening and closing of each production valve on the underwater Christmas tree is controlled, and the production channel and the annulus channel are monitored: Specifically, the Christmas tree control mode is that the MCS main control station skid-mounted system realizes the opening or closing of the PMV production main valve, PWV production wing valve, AMV annulus main valve, AWV annulus wing valve, CIV chemical injection valve, XOV cross valve, and SCSSV ground control downhole safety valve on the underwater Christmas tree through data interactive control via the SPCU underwater power communication unit and the SCM underwater control module. The SPCU underwater power communication unit is used to monitor the PPTT production pressure and temperature transmitter on the production channel and the APTT pressure and temperature sensor on the annulus channel through real-time communication with the SCM underwater control module.

[0058] 3. Online insulation monitoring and ground discharge of the underwater power supply and communication unit: The SPCU underwater power supply and communication unit is used to provide power and communication links to the SCM underwater control module. An online insulation monitoring device is installed on its output port to monitor the insulation resistance of the cable and the SCM underwater control module in real time. In order to improve safety and avoid the risk of electric shock caused by long cable storage charges, a cable-to-ground discharge circuit is provided at the output port of the SPCU underwater power supply and communication unit, which can manually discharge the power / communication cable to the ground.

[0059] 4. Remote operation and fault diagnosis of underwater equipment: The SPCU underwater power communication unit uses a redundant power supply plus power carrier to power and control the SCM underwater control module through an umbilical cable; the SCM underwater control module centrally collects data from underwater equipment, such as the status and data of the SCM underwater control module, the valve status and data of the underwater oil production tree, the status and data of the PPTT production pressure and temperature transmitter and the APTT annular space pressure and temperature sensor, and controls the operation of the underwater equipment to achieve remote operation and fault diagnosis of the underwater equipment.

[0060] 5. Control various actions of the THRT tubing hanger operating tool and the TH tubing hanger, and monitor the pressure and flow curves on the corresponding hydraulic circuits: The specific control mode of the tubing string landing is that the MCS main control station skid system provides power and signals, and controls the HPU hydraulic power unit skid system through a series of pump groups. The HPU hydraulic power unit skid system controls the solenoid valves on the hydraulic circuit to achieve the locking or unlocking operation of the THRT tubing hanger operating tool and the TH tubing hanger, the locking or unlocking confirmation of the THRT tubing hanger operating tool and the TH tubing hanger, the locking verification of the TH tubing hanger, the locking or unlocking operation of the TH tubing hanger and the underwater Christmas tree, the locking or unlocking confirmation of the TH tubing hanger and the underwater Christmas tree, the opening or closing operation of the UDF quick release frame and the SCSSV ground-controlled subsea safety valve, and monitors the pressure and flow curves on the corresponding hydraulic circuits, and determines the action status of all valve switch states, valve flow and valve pressure.

[0061] 6. Power distribution of the MCS master control station skid-mounted system and the HPU hydraulic power unit skid-mounted system: The MCS master control station skid-mounted system adopts a positive pressure explosion-proof skid-mounted structure, including an EPU power subsystem, a CPFG positive pressure explosion-proof and fire and gas control subsystem, a PLC subsystem, an instrument subsystem, a communication network subsystem, an external control unit, and a SCADA data monitoring and acquisition subsystem, an ROV video access subsystem, an FGS fire and gas access subsystem, and a PAGA public broadcast alarm subsystem. Among them, the SCADA data monitoring and acquisition subsystem, the ROV video access subsystem, the FGS fire and gas access subsystem, and the PAGA public broadcast alarm subsystem are synchronous access systems that interact with the platform's security system.

[0062] The EPU power subsystem is used to realize power distribution for the MCS master control station skid-mounted system and the HPU hydraulic power unit skid-mounted system, including the platform main power supply, emergency power supply and built-in redundant UPS main power distribution system, emergency power distribution system, non-explosion-proof equipment power distribution system, main transformer and power distribution control circuit; the built-in redundant UPS power supply of the EPU power subsystem adopts a dual online UPS system, the battery pack adopts an explosion-proof structure, and is equipped with a battery pack H2 monitoring and emission system to meet safety requirements;

[0063] 7. CPFG positive pressure explosion protection and fire and gas control: The CPFG positive pressure explosion protection and fire and gas control subsystem adopts a redundant dual-fan configuration, that is, a dual positive pressure fan skid system, which is used to provide clean air for the MCS main control station skid-mounted system. The dual positive pressure fan skid system has an automatic switching function. When one of the fans fails, the system will automatically switch to the other fan to maintain the positive pressure environment in the skid; the CPFG positive pressure explosion protection and firearm control subsystem adopts a dual-use and one-standby redundant power supply configuration, which can automatically switch between the main and standby power supplies to realize power supply to the main power distribution system, built-in redundant UPS power supply, and emergency power distribution system, so as to improve the reliability of the CPFG positive pressure explosion protection and firearm control subsystem and prevent the MCS main control station skid-mounted system from being shut down due to loss of pressure.

[0064] 8. On-site data acquisition, remote control, monitoring and switch control: The PLC control subsystem includes the MCS local PLC system and the HPU remote PLC system, which can realize on-site data acquisition, remote control, monitoring and switch control. Specifically, it is used to realize on-site data acquisition of the HPU hydraulic power unit skid-mounted system and the MCS master control station skid-mounted system, remote control of the pump group of the HPU hydraulic power unit skid-mounted system, and monitoring of the SCM underwater control module. The SCM underwater control module is used to monitor the PPTT production pressure and temperature transmitter and the APTT pressure sensor, and the valve switch is controlled by the SCM underwater control module to complete the control of each valve of the underwater oil production tree.

[0065] 9. Master control station skid-mounted system instrument data collection and display: The instrument subsystem adopts a distributed layout and is respectively installed in the MCS master control station skid-mounted system and the HPU hydraulic power unit skid-mounted system. At the same time, the MCS local PLC system in the MCS master control station skid-mounted system serves as the control and operation center, and the HPU remote PLC system in the MCS master control station skid-mounted system and the HPU hydraulic power unit skid-mounted system serves as the data collection center. These systems collect data from sensors and intelligent instruments inside and outside the skid, and then exchange data through the ring main unit inside the MCS master control station skid-mounted system and the HPU hydraulic power unit skid-mounted system. It should be noted that the configuration of the MCS local PLC system and the HPU remote PLC system matches the number of on-site signal points. The instrument subsystem adopts a distributed design to collect data from sensors and intelligent instruments inside and outside the skid. Data exchange through the ring main unit brings the collection end closer to the equipment, reduces the cables and communication lines between the two systems, and effectively improves the reliability of the signal.

[0066] 10. On-site networking and flexible topology selection: The network communication subsystem adopts a two-layer ring TCP / IP network architecture. The upper system data exchange layer and the field instrument data exchange layer respectively form two interconnected ring networks to avoid network congestion caused by data storms between systems. Non-TCP / IP protocol field intelligent instruments can be connected to the single network port protocol expansion interface module under the field instrument network layer, facilitating on-site networking and flexible topology selection.

[0067] 11. Remote / local operation: The external control unit includes a remote control station RCP, an external ESD emergency shutdown station and a platform DCS remote control station. The external ESD emergency shutdown station is used to remotely start the ESD emergency shutdown program; the platform DCS remote control station, the remote control station RCP and the local workstation can all realize remote data monitoring of underwater oil production equipment such as underwater oil production trees and TH oil pipe hangers; and can switch control sources to avoid control rights competition problems caused by multiple locations; the remote control station RCP is a mobile operation station, which adopts an explosion-proof integrated industrial computer and can be installed at any location within 100m of the MCS main control station skid-mounted system; the local workstation is placed in the MCS main control station skid-mounted system, which adopts a 2K high-definition display screen and can display multiple screens in split screen; the remote control station RCP, the external ESD emergency shutdown station and the platform DCS remote control station all access the remote server through the C / S architecture, and switch operations through the remote / local switch of the external control unit. Through network connection, the complexity of the system is effectively simplified.

[0068] 12. Video sharing of underwater operation robots: The ROV video access subsystem can realize video sharing of underwater operation robots, which facilitates on-site operators to understand the underwater operation status in real time and access the drilling platform production system;

[0069] 13. Information sharing and synchronization of the platform fire and gas system: The FGS fire and gas access subsystem can achieve information sharing and synchronization with the platform fire and gas system, thereby effectively ensuring the safety of operations and personnel;

[0070] 14. Sharing of platform broadcast: The PAGA public broadcast alarm subsystem is used to achieve sharing with the platform broadcast, facilitating information communication between the MCS master control station skid-mounted system and the platform drilling floor and central control personnel;

[0071] The FGS fire and gas access subsystem and the PAGA public address alarm subsystem are both connected to the drilling platform safety production system.

[0072] In actual operation, during the well completion and workover phase, the tubing string control mode is adopted. The HPU hydraulic power unit skid system is controlled by the pump group. The HPU hydraulic power unit skid system then controls the THRT tubing hanger operating tool and related operations of the TH tubing hanger through the solenoid valve on the hydraulic circuit, thereby realizing the operation process of running the TH tubing hanger with the tubing string. After the TH tubing hanger is lowered, the oil tree control mode of the MCS main control station skid system is entered to control the valve operation and the control status of each valve on the subsea oil tree.

[0073] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the scope of protection of the present invention.

Claims

1. A distributed underwater wellhead completion and workover control system, characterized by: It includes an MCS main control station skid-mounted system, an HPU hydraulic power unit skid-mounted system and underwater oil production equipment; the MCS main control station skid-mounted system is connected to the HPU hydraulic power unit skid-mounted system and the underwater oil production equipment through electro-hydraulic pipelines; the MCS main control station skid-mounted system is connected to the HPU hydraulic power unit skid-mounted system and the underwater oil production equipment and realizes communication; The MCS master control station skid-mounted system serves as a power supply and main control station, used to supply power to the HPU hydraulic power unit skid-mounted system and underwater oil production equipment; the HPU hydraulic power unit skid-mounted system serves as a hydraulic station, used to supply hydraulic power to the underwater oil production tree; The MCS master control station skid-mounted system adopts a positive pressure explosion-proof skid-mounted structure, including an EPU power subsystem, a CPFG positive pressure explosion-proof and fire and gas control subsystem, a PLC control subsystem, an instrument subsystem, a network communication subsystem, an external control unit, and a SCADA data monitoring and acquisition subsystem, an ROV video access subsystem, an FGS fire and gas access subsystem, and a PAGA public broadcast alarm subsystem. The SCADA data monitoring and acquisition subsystem, the ROV video access subsystem, the FGS fire and gas access subsystem, and the PAGA public broadcast alarm subsystem are synchronous access systems that interact with the platform's security system. The network communication subsystem adopts a double-layer ring TCP / IP network architecture. The upper system data exchange layer and the field instrument data exchange layer respectively form two interconnected ring networks to avoid network congestion caused by data storms between systems. Non-TCP / IP protocol field intelligent instruments can be connected to the single network port protocol expansion interface module under the field instrument network layer, which facilitates on-site networking and flexible selection of topology structure. The external control unit includes a remote control station RCP, an external ESD emergency shutdown station and a platform DCS remote control station. The external ESD emergency shutdown station is used to remotely start the ESD emergency shutdown program; The platform's DCS remote control station, remote control station RCP and on-site workstation can all achieve remote data monitoring of underwater oil production equipment; It can also switch the control source to avoid the control rights competition caused by multiple control locations. The remote control station RCP is a mobile operation station that uses an explosion-proof integrated industrial computer and can be installed at any location within 100 meters of the MCS main control station skid-mounted system. An on-site workstation is installed in the MCS master control station skid-mounted system, using a 2K high-definition display screen capable of displaying multiple images in split-screen mode. The remote control station RCP, external ESD emergency shutdown station and platform DCS remote control station all access the remote server through the C / S architecture and perform switching operations through the remote / local switch of the external control unit.

2. The distributed underwater wellhead completion and workover control system according to claim 1, characterized in that: The underwater oil production equipment includes an underwater oil tree, an SCM underwater control module, a THRT tubing hanger running tool and a TH tubing hanger. The four items of equipment are placed at the underwater wellhead and are connected to the MCS master control station skid-mounted system and the HPU hydraulic power unit skid-mounted system through electro-hydraulic pipelines or umbilical cables.

3. The distributed underwater wellhead completion control system according to claim 2, characterized in that: The MCS master control station skid-mounted system is internally provided with an SPCU underwater power supply communication unit, which is connected to the SCM underwater control module via an umbilical cable. At the same time, the SPCU underwater power supply communication unit realizes power supply and data communication for the SCM underwater control module.

4. The distributed underwater wellhead completion control system according to claim 3, characterized in that: The MCS master control station skid-mounted system includes a Christmas tree control mode and a landing string control mode.

5. The distributed underwater wellhead completion and workover control system according to claim 4, characterized in that: Specifically, the Christmas tree control mode is as follows: the MCS master control station skid-mounted system realizes the opening or closing of the PMV production main valve, PWV production wing valve, AMV annular main valve, AWV annular wing valve, CIV chemical injection valve, XOV cross valve, and SCSSV ground-controlled downhole safety valve on the underwater Christmas tree through data interactive control of the SPCU underwater power communication unit and the SCM underwater control module; the SPCU underwater power communication unit communicates with the SCM underwater control module in real time to monitor the PPTT production pressure and temperature transmitter on the production channel and the APTT pressure and temperature sensor on the annular channel; The SPCU underwater power supply and communication unit is used to provide power and communication links to the SCM underwater control module. An online insulation monitoring device is installed on its output port to monitor the insulation resistance of the cable and the SCM underwater control module in real time. A cable-to-ground discharge circuit is provided on the output port of the SPCU underwater power supply and communication unit, which can manually discharge the power / communication cable to the ground; The SPCU underwater power communication unit uses a redundant power supply plus power carrier to power and control the SCM underwater control module through an umbilical cable; the SCM underwater control module centrally collects data from underwater equipment and controls the movement of underwater equipment, realizing remote operation and fault diagnosis of underwater equipment.

6. The distributed underwater wellhead completion and workover control system according to claim 4, characterized in that: Specifically, the control mode of the landing string is as follows: the MCS main control station skid system provides power and signals, and controls the HPU hydraulic power unit skid system through a series of pump groups. The HPU hydraulic power unit skid system controls the solenoid valves on the hydraulic circuit to realize the locking or unlocking operation of the THRT tubing hanger running tool and the TH tubing hanger, the locking or unlocking confirmation of the THRT tubing hanger running tool and the TH tubing hanger, the locking verification of the TH tubing hanger, the locking or unlocking operation of the TH tubing hanger and the underwater oil tree, the locking or unlocking confirmation of the TH tubing hanger and the underwater oil tree, the opening or closing operation of the UDF quick release frame and the SCSSV ground control subsea safety valve, and monitors the pressure and flow curves on the corresponding hydraulic circuit, and determines the action status of all valve switch states, valve flow and valve pressure.

7. The distributed underwater wellhead completion and workover control system according to claim 1, characterized in that: The EPU power subsystem is used to realize power distribution for the MCS master control station skid-mounted system and the HPU hydraulic power unit skid-mounted system, including the platform main power supply, emergency power supply and built-in redundant UPS main power distribution system, emergency power distribution system, non-explosion-proof equipment power distribution system, main transformer and power distribution control circuit; the built-in redundant UPS power supply of the EPU power subsystem adopts a dual online UPS system, the battery pack adopts an explosion-proof structure, and is equipped with a battery pack H2 monitoring and emission system; The CPFG positive pressure explosion protection and fire and gas control subsystem uses a redundant dual-fan configuration, namely a dual positive pressure fan skid system, which is used to provide clean air to the MCS master control station skid system. The dual positive pressure fan skid system has an automatic switching function. When one fan fails, the system will automatically switch to the other fan to maintain the positive pressure environment in the skid. The CPFG positive pressure explosion protection and firearm control subsystem uses a dual-use and one-backup redundant power supply configuration, which can automatically switch between the main and backup power supplies to realize power supply of the main power distribution system, the built-in redundant UPS power supply, and the emergency power distribution system. The PLC control subsystem includes the MCS local PLC system and the HPU remote PLC system, which are used to realize on-site data collection of the HPU hydraulic power unit skid-mounted system and the MCS master control station skid-mounted system, remote control of the pump group of the HPU hydraulic power unit skid-mounted system, and monitoring of the SCM underwater control module. The SCM underwater control module is used to monitor the PPTT production pressure and temperature transmitters and the APTT pressure and temperature sensors, and the SCM underwater control module is used to control the valve switches to complete the control of each valve of the underwater oil production tree.

8. The distributed underwater wellhead completion control system according to claim 1, characterized in that: The instrument subsystem adopts a distributed layout and is respectively set up in the MCS master control station skid-mounted system and the HPU hydraulic power unit skid-mounted system. At the same time, the MCS local PLC system in the MCS master control station skid-mounted system serves as the control and calculation center, and the HPU remote PLC system in the MCS master control station skid-mounted system and the HPU hydraulic power unit skid-mounted system serves as the data acquisition center to collect data from sensors and intelligent instruments inside and outside the skid, and then exchange data through the ring network cabinet inside the MCS master control station skid-mounted system and the HPU hydraulic power unit skid-mounted system.

9. The distributed underwater wellhead completion and workover control system according to claim 1, characterized in that: The ROV video access subsystem can realize video sharing of underwater operation robots, making it easier for on-site operators to understand the underwater operation status in real time and access the drilling platform production system; The FGS fire and gas access subsystem can achieve information sharing and synchronization with the platform fire and gas system to ensure the safety of operations and personnel; The PAGA public address alarm subsystem is used to realize sharing with the platform broadcast, facilitating information communication between the MCS master control station skid-mounted system and the platform drilling floor and central control personnel; The FGS fire and gas access subsystem and the PAGA public address alarm subsystem are both connected to the drilling platform safety production system.

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