CN116025311B - An underwater fully electric controlled string placement system and method - Google Patents

Abstract

The invention discloses an underwater full-electric control sitting pipe column system which comprises a platform high-voltage power system, a ground platform, an umbilical cable laying system, an all-electric blowout prevention valve system, an underwater power regulation and control system, an underwater intelligent electric control system, an underwater electric safety protection system and an underwater intelligent electric heating system. The data acquisition system performs data acquisition on underwater environment parameters, the platform visual control system receives information and transmits a command to the underwater intelligent electric control system after analysis, and the underwater intelligent electric control system controls the underwater electric safety protection system. The invention replaces an electrohydraulic or pure hydraulic power system by using an all-electric system, realizes underwater remote accurate monitoring and control, and has higher response speed and higher reliability; the power source adopts electric power completely, and the hydraulic actuator is replaced by the pure electric actuator, so that an underwater control system and an umbilical cable laying system are simplified, zero pollution emission is realized, and the urgent requirements of marine environment protection and improvement of operation efficiency are met.

Description

An underwater fully electric controlled string placement system and method

Technical Field

The present invention relates to the field of underwater equipment systems for marine energy development, and in particular to an underwater fully electrically controlled string placement system.

Background technique

Deepwater oil and gas well formation testing (deepwater testing for short) is a key link in deepwater oil and gas development, and bears the important responsibility of timely discovering and accurately evaluating deepwater marine oil and gas reservoirs. At present, deepwater testing operations mostly use small floating platforms with relatively dense equipment and personnel. Once a blowout occurs during the test or the oil and gas introduced into the platform leaks, it will lead to major accidents such as explosion, fire, poisoning and environmental pollution.

The deepwater test string system is a key tool that must be used when encountering special sea conditions. It is used to seal the high-pressure oil and gas in the string, quickly disconnect the test string, evacuate the drilling platform, and achieve safety protection for deepwater test operations. The control system of the deepwater test string system is the key to realizing its core functions such as shearing, sealing, release, and back-connection.

The control system of the deepwater test string system has gone through three stages of development: direct hydraulic control, pilot hydraulic control and electro-hydraulic control. The electro-hydraulic control system is currently the most commonly used control system for the deepwater test string system. However, with the increase in the depth of deep-sea oil and gas development, the electro-hydraulic control system of the deepwater test string system is gradually unable to adapt to the requirements of the ultra-deepwater working environment, and there are several problems:

1. As offshore oil and gas resource development shifts to ultra-deep water, the development environment becomes increasingly harsh, and the slow response speed of hydraulic control is not conducive to achieving efficient control. For offshore oil and gas fields in ultra-deep water and long-distance tiebacks, if hydraulics are continued to be used as power, the evacuation efficiency of the drilling ship will be greatly affected due to a certain lag in response time; problems such as ultra-high hydrostatic pressure and hydraulic oil flow will seriously limit the practicality of the electro-hydraulic composite underwater control system;

2. Hydraulic oil has management risks during transportation and storage, and is prone to leakage. Its own compressibility will cause pipeline deformation after a long time. The cleanliness of hydraulic oil is easily contaminated, which has a significant impact on the stability of the hydraulic system and may even cause the hydraulic system to fail. In addition, discharging hydraulic oil into the sea does not meet environmental protection requirements;

3. In deepwater ultra-high pressure environments (pressure levels above 20,000 psi), underwater accumulators reach their limits in terms of size and weight, and higher requirements are placed on the structural strength of the umbilical cable, causing a sharp increase in mining costs. In addition, most system failures in the current control system are caused by hydraulic components. As the water depth of oil and gas development increases, the failure rate of hydraulic components is still increasing, reducing the overall safety and stability of the control system.

Therefore, as oil and gas production operations continue to develop towards deepwater and ultra-deepwater, in order to more effectively ensure the safety of deepwater testing operations, it is necessary to invent an underwater fully electrically controlled string landing system to solve the problems existing in the above-mentioned direct hydraulic control, pilot hydraulic control and electro-hydraulic control, and meet the needs of operations such as running deepwater completion equipment, mid-course testing and evaluation, reservoir cleaning, well repair, well abandonment and production increase.

Summary of the invention

1. Technical issues to be solved

The purpose of the present invention is to overcome the deficiencies of the prior art and provide an underwater fully electric control string landing system. The fully electric system is used to replace the hydraulic power system to provide a power source for the underwater electric safety protection system, so as to achieve long-distance precision control and faster response speed. It solves the problem that as deepwater testing operations gradually turn to ultra-deep water, hydraulic oil transmission, hydrostatic pressure, and other issues limit the practicality of hydraulic drive. The power source of the control system is replaced by electricity, and the complex hydraulic pipelines in the umbilical cable are removed, which can meet the urgent requirements of zero pollution emissions for environmental protection, and solve the problems that the cleanliness of hydraulic oil is easily contaminated, which affects the stability of the hydraulic system, and the hydraulic oil is prone to leakage, which may cause pipeline deformation. The umbilical cable laying system is simplified, and the underwater electric safety protection system is used to replace the hydraulic components, which improves the safety and stability of the control system and solves the problems that the underwater accumulator reaches the size and weight limits and the high failure rate of hydraulic components in ultra-deep water environments.

(II) Technical solution

The objective of the present invention is achieved through the following technical solutions: an underwater fully electric control string landing system, characterized in that it includes a platform high-voltage power system, a platform visualization control system, a power and communication transmission system, an umbilical cable laying system, a fully electric blowout preventer system, an underwater power regulation system, an underwater intelligent electric control system, an underwater electric safety protection system and an underwater intelligent electric heating system; the platform high-voltage power system includes a power generation device, a backup power supply system and a transformer; the platform visualization control system includes a human-computer interaction display screen, a CPU and a PLC; the power and communication transmission system includes an optical fiber communication unit and a power unit; the umbilical cable laying system includes Umbilical winch and umbilical cable; the all-electric blowout preventer system includes a visual monitoring camera I; the underwater power control system includes a signal conversion unit and an underwater transformer; the underwater intelligent electric control system includes a accumulator A, a motor controller and an underwater intelligent control unit, and the underwater intelligent control unit includes a humidity sensor, a temperature sensor, a pressure sensor, a data acquisition system, a microprocessor, a communication unit A and a accumulator B; the underwater electric safety protection system includes an all-electric underwater test tree safety valve, an all-electric underwater test tree connector, an all-electric check valve, a communication unit B and a visual monitoring camera II; the underwater intelligent electric heating system includes a temperature control device The power generation device is electrically connected to the backup power supply system and the transformer, the backup power supply system is electrically connected to the transformer, forming the platform high-voltage power system, the platform high-voltage power system is electrically connected to the platform visualization control system, the power and communication transmission system, the human-machine interaction display screen is electrically connected to the CPU, the CPU is electrically connected to the PLC, the umbilical cable is installed on the umbilical cable winch, forming the umbilical cable laying system, the all-electric blowout preventer system is connected to the ground platform through the umbilical cable, the optical fiber communication unit and the power unit are connected to the visualization monitoring camera I through the umbilical cable, the optical fiber communication unit is connected to the signal conversion unit through the umbilical cable, and the power unit is connected to the underwater transformer through the umbilical cable. The accumulator B, the data acquisition system and the communication unit A are electrically connected to the microprocessor, the humidity sensor, the temperature sensor and the pressure sensor are installed on the interface of the data acquisition system to form an underwater intelligent control unit, the signal conversion unit is connected to the underwater intelligent control unit through an umbilical cable, the underwater transformer is connected to the underwater intelligent control unit and the accumulator A through an umbilical cable, the temperature control device and the time relay are electrically connected to the electric heating pipe to form an underwater intelligent electric heating system, the accumulator A is electrically connected to the underwater intelligent electric heating system through the umbilical cable, the accumulator A is electrically connected to the visual monitoring camera II, the accumulator A is electrically connected to the motor controller, and the motor controller is electrically connected to the all-electric valve mechanism.

The signal conversion unit is used to convert the upper long-distance optical fiber signal into copper twisted pair DSL communication, making the control system more reliable.

The power and communication transmission system transmits high voltage current to the underwater power control system, and the underwater transformer converts the high voltage transmitted from the upper part into the low voltage required by the underwater intelligent electric control system, and completes the distribution of electricity.

The battery A receives power from above and can store electricity to provide power for the underwater electric safety protection system. It can switch the working mode from continuous power supply to intermittent power supply, thus greatly reducing power consumption.

The umbilical cable includes an electrical cable and an optical fiber communication cable. The electrical cable is used for power transmission in the system, and the optical fiber communication cable is used for transmitting optical fiber communication signals.

The signal conversion unit provides communication redundancy for the underwater equipment, the power unit provides redundant power supply for the underwater equipment, and the underwater intelligent electric control system and the underwater electric safety protection system are both redundantly configured, thereby improving the reliability of the control system.

The underwater intelligent control unit is provided with a storage device to supply power to the data acquisition system and the microprocessor in the underwater intelligent control unit.

The data acquisition system is provided with a plurality of data transmission interfaces to collect the status information of the underwater equipment and monitor the working status of the control system in real time.

The underwater intelligent electric heating system is provided with a temperature control device, a time relay and an electric heating tube. The cooperation between the temperature control device and the time relay realizes the timed operation and timed shutdown of the temperature control device, and can intelligently control the wellhead temperature and inhibit the formation of hydrates.

The data acquisition system is provided with a plurality of data transmission interfaces to collect the status information of the underwater equipment and monitor the working status of the control system in real time.

The underwater electric actuator is provided with a standard spring return structure as a fail-safe shut-off device.

The underwater electric mechanism is also provided with a plurality of sensors to monitor the working state of the all-electric valve mechanism and environmental parameters such as temperature, humidity, and pressure.

A pressure sensor is provided inside the all-electric check valve to monitor the pressure parameters inside the all-electric check valve in real time.

The switch of the battery is arranged in the underwater intelligent control unit, and the switch of the battery is controlled by the underwater intelligent control unit.

The electric heating tubes are arranged in multiple groups and evenly distributed around the wellhead. The electric heating tubes are controlled by a temperature control device and a time relay to maintain the temperature of the wellhead and inhibit the formation of hydrates.

A pressure relief protector is arranged inside the all-electric check valve to release the trapped pressure blocked between the all-electric underwater test tree safety valve and the all-electric check valve.

The visualization monitoring camera I and the visualization monitoring camera II are used to monitor the underwater environment in real time and realize the visualization of the ground platform of the underwater environment.

The platform high-voltage power system is provided with a power generation device and a backup power supply system. When the power generation device fails, the backup power supply system can supply power to the underwater fully electric-controlled string landing system.

The method is:

Emergency rescue steps:

S1: When encountering special severe weather or emergency, the communication unit B and the internal sensors of the underwater intelligent electric control system transmit the data of the working status of the underwater electric safety protection system valve, the internal temperature of the underwater electric safety protection system, the internal humidity of the underwater electric safety protection system, the internal environmental parameters of the underwater intelligent electric control system, and the working status of the test string to the data acquisition system; the data acquisition system transmits the collected underwater environmental information to the microprocessor,

S2: The microprocessor uploads the obtained data information to the CPU. After the CPU obtains the data and analyzes it, it concludes that emergency release is required. The staff controls the CPU to send an emergency release command downward through the human-computer interactive display screen;

S3: The CPU sends a signal to the underwater intelligent electric control system through the optical fiber communication unit, and the accumulator A obtains the power transmitted from the upper part, shuts down the underwater intelligent electric heating system through the temperature control device, shuts down the all-electric underwater test tree safety valve through the motor controller, cuts the internal steel wire or coiled tubing, and cuts off the upward return fluid in the test string;

S4: close the all-electric check valve through the motor controller to block the fluid above the all-electric check valve in the test string;

S5: Control the all-electric underwater test tree connector to be disconnected through the motor controller, and control the pressure relief protector through the motor controller to discharge the fluid blocked between the safety valve and the all-electric check valve of the all-electric underwater test tree into the watertight pipe string;

S6: The pressure sensor inside the all-electric check valve monitors the internal pressure data in real time. The data obtained is transmitted to the CPU through the data acquisition system and the microprocessor. When the human-computer interactive display screen shows that the trapped pressure in the all-electric check valve has been released, the upper test string is lifted out of the all-electric blowout preventer system, the full-sealing gate of the all-electric blowout preventer system is closed, the environmental control space of the lower test string is separated, the emergency release of the sitting string is realized, and the drilling platform is safely evacuated.

Steps to reconnect:

S1: After the ocean situation stabilizes or the emergency situation is resolved, open the fully sealed gate of the all-electric blowout preventer valve system and re-enter the landing string;

S2: Control the all-electric underwater test tree connector to reconnect through the motor controller;

S3: The electric check valve is opened through the motor controller, and the pressure relief protector is closed. The electric check valve circuit is turned on, and the electric underwater test tree safety valve is opened through the motor controller to complete the reconnection of the test string and resume deepwater testing operations.

S1: When encountering special bad weather or emergency, the communication unit B and the internal sensors of the underwater intelligent electric control system transmit the working status of the underwater electric safety protection system valve, the internal temperature of the underwater electric safety protection system, the internal humidity of the underwater electric safety protection system, the internal environmental parameters of the underwater intelligent electric control system, the working status of the test string and other data to the data acquisition system. The data acquisition system transmits the collected underwater environmental information to the microprocessor, and the microprocessor uploads the obtained data information to the CPU. After the CPU obtains the data, it needs to be urgently released. The staff controls the CPU to send the emergency release command downward through the human-computer interactive display screen;

S2: CPU controls the shear gate in the all-electric blowout preventer valve system to cut off the shear nipple in the control system through the optical fiber communication unit;

S3: Pull out the cut-off test string, close the full-seal gate of the all-electric blowout preventer valve system, and separate the environmental control space of the lower test string;

Steps to reconnect:

S1: After the ocean situation stabilizes or the emergency situation is lifted, open the fully sealed gate of the all-electric blowout preventer valve system and use the salvage tool to salvage the test pipe string trapped at the bottom, replace it and re-insert a new test pipe string;

S2: Control the reconnection of the all-electric underwater test tree connector through motor control;

S3: The all-electric check valve is opened through motor control, the circuit of the all-electric check valve is connected, and the all-electric underwater test tree safety valve is opened through motor control to complete the reconnection of the test string.

(III) Beneficial effects

The beneficial effects of the present invention are:

(1) An underwater fully electric control string landing system uses a fully electric system to replace the hydraulic power system, providing a power source for the underwater electric safety protection system and the underwater intelligent electric control system, achieving long-distance precise control and faster response speed.

(2) The above-water hydraulic power unit and underwater accumulator are eliminated, and the hydraulic pipelines (high pressure/low pressure/return oil) in the umbilical cable are removed, which reduces the size of the umbilical cable, greatly reduces the cost, and meets the urgent requirement of zero pollution emission for environmental protection.

(3) An underwater electric safety protection system is used instead of traditional hydraulic components, which simplifies the composition of the underwater system, reduces the number of moving wearing parts and seals, and improves the reliability of the landing column system and its underwater actuator.

(4) A storage battery and a data acquisition system are installed in the underwater electric safety protection system. The storage battery can store the electricity transmitted from the upper part to continuously power the underwater electric safety protection system, so that the control system switches from continuous power supply to intermittent power supply, greatly reducing power consumption and realizing real-time status monitoring in ultra-deep water environment.

(5) The data acquisition system can monitor the wellhead pressure in real time. At the same time, an underwater intelligent electric heating system is set up to control the wellhead temperature, which can effectively monitor and inhibit hydrate formation.

Description of the drawings:

FIG1 is a schematic diagram of the control system structure of the present invention;

FIG2 is a schematic diagram of the system relationship of the present invention;

FIG3 is a control principle diagram of an underwater intelligent control unit of the present invention;

FIG4 is a flow chart of the all-electric valve control of the present invention;

FIG5 is a schematic diagram of the structure of the underwater intelligent electric heating system of the present invention;

In the figure, 1. Platform high-voltage power system; 101. Power generation device; 102. Backup power supply system; 103. Transformer; 2. Platform visual control system; 201. Human-computer interaction display screen; 202. CPU; 203. PLC; 3. Power and communication transmission system; 301. Optical fiber communication unit; 302. Power unit; 4. Umbilical cable laying system; 401. Umbilical cable winch; 402. Umbilical cable; 5. All-electric blowout preventer system; 501. Visual monitoring camera I; 6. Underwater power control system; 601. Signal conversion unit; 602. Underwater transformer; 7. Underwater intelligent electric control system ;701. Battery A;702. Motor controller;703. Humidity sensor;704. Temperature sensor;705. Pressure sensor;706. Data acquisition system;707. Microprocessor;708. Communication unit A;709. Battery B;8. Underwater electric safety protection system;801. All-electric underwater test tree safety valve;802. All-electric underwater test tree connector;803. All-electric check valve;804. Communication unit B;805. Visual monitoring camera II;9. Underwater intelligent electric heating system;901. Temperature control device;902. Time relay;903. Electric heating tube.

Detailed ways:

The technical solution of the present invention is described clearly and completely below in conjunction with the accompanying drawings. 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.

In the description of the present invention, it should be noted that the directions or positional relationships indicated by "center", "up", "down", "left", "right", "vertical", "horizontal", "inside", "outside", etc. are directions or positional relationships based on the drawings, which are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as limiting the present invention. In addition, "first" and "second" are only used for descriptive purposes and cannot be understood as indicating or implying relative importance.

In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, "installation", "connection" and "connection" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

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.

As shown in Figure 1 and Figure 2, an underwater fully electric control string landing system is characterized in that it includes a platform high-voltage power system 1, a platform visual control system 2, a power and communication transmission system 3, an umbilical cable laying system 4, an all-electric blowout preventer system 5, an underwater power regulation system 6, an underwater intelligent electric control system 7, an underwater electric safety protection system 8 and an underwater intelligent electric heating system 9; the platform high-voltage power system 1 includes a power generation device 101, a backup power supply system 102 and a transformer 103; the platform visual control system 2 includes a human-computer interaction display screen 201, a CPU 202 and a PLC 203; the power and communication transmission system 3 includes an optical fiber communication unit 301 and a power unit 302; the umbilical cable laying system 4 includes an umbilical cable winch 401 and an umbilical cable 402; the all-electric blowout preventer system 5 includes a visual monitoring The underwater power control system 6 includes a signal conversion unit 601 and an underwater transformer 602; the underwater intelligent electric control system 7 includes a accumulator A701, a motor controller 702 and an underwater intelligent control unit, and the underwater intelligent control unit includes a humidity sensor 703, a temperature sensor 704, a pressure sensor 705, a data acquisition system 706, a microprocessor 707, a communication unit A708 and a accumulator B709; the underwater electric safety protection system 8 includes an all-electric underwater test tree safety valve 801, an all-electric underwater test tree connector 802, an all-electric check valve 803, a communication unit B804 and a visual monitoring camera II 805; the underwater intelligent electric heating system 9 includes a temperature control device 901, a time relay 902 and an electric heating tube 903, wherein the power generation device 101 and The backup power supply system 102 and the transformer 103 are electrically connected, and the backup power supply system 102 is electrically connected to the transformer 103 to form a platform high-voltage power system 1. The platform high-voltage power system 1 is electrically connected to the platform visualization control system 2 and the power and communication transmission system 3. The human-machine interaction display screen 201 is electrically connected to the CPU 202, and the CPU 202 is electrically connected to the PLC 203. The umbilical cable 402 is installed on the umbilical cable winch 401 to form an umbilical cable laying system 4. The all-electric blowout preventer system 5 is connected to the ground platform through the umbilical cable 402. The optical fiber communication unit 301 and the power unit 302 are connected to the visualization monitoring camera I 501 through the umbilical cable 402. The optical fiber communication unit 301 is connected to the signal conversion unit 601 through the umbilical cable 402. The power unit 302 is connected to the underwater transformer 602 through the umbilical cable 402. The accumulator B70 9. The data acquisition system 706 and the communication unit A708 are electrically connected to the microprocessor 707. The humidity sensor 703, the temperature sensor 704 and the pressure sensor 705 are installed on the interface of the data acquisition system 706 to form an underwater intelligent control unit. The signal conversion unit 601 is connected to the underwater intelligent control unit through the umbilical cable 402. The underwater transformer 602 is connected to the underwater intelligent control unit and the accumulator A701 through the umbilical cable 402. The temperature control device 901 and the time relay 902 are electrically connected to the electric heating tube 903 to form an underwater intelligent electric heating system 9. The accumulator A701 is electrically connected to the underwater intelligent electric heating system 9 through the umbilical cable 402. The accumulator A701 is electrically connected to the visual monitoring camera II 805. The accumulator A701 is electrically connected to the motor controller 702. The motor controller 702 is electrically connected to the all-electric valve mechanism.

As shown in Figure 3, it is a control schematic diagram of the system control unit. The power unit supplies power to the battery B and the system controller, and the battery B supplies power to the system controller, the data acquisition module and various sensors. The system controller controls the start and stop of the motor controller through the communication unit A, and receives the monitoring information transmitted by the motor controller. It receives the monitoring information of various sensors through the data acquisition module, and transmits the information back to the platform visualization control system after analysis.

As shown in FIG5 , it is a schematic diagram of the structure of the underwater intelligent electric heating system 9, wherein multiple groups of electric heating tubes 903 are arranged evenly around the wellhead. The temperature control device 901 and the time relay 902 obtain the power transmitted from the upper part to control the electric heating tube 903, wherein the temperature control device 901 controls the temperature of the electric heating tube 903 in real time to maintain it within a certain range, and the time relay 902 enables the temperature control device 901 to regularly control the temperature of the electric heating tube 903, maintain stable operation and reduce energy consumption. The underwater intelligent electric heating system 9 is provided with a temperature sensor and a humidity sensor, which can monitor the working status of the underwater intelligent electric heating system 9 in real time.

Affected by offshore wind, waves, surges, severe weather and special sea conditions (such as typhoons, tsunamis, etc.), the platform is prone to heave, drift and other movements, which may lead to damage to platform equipment and completion strings, and even explosions and casualties. When encountering emergencies during operations such as deepwater completion equipment lowering, mid-course testing and evaluation, reservoir cleaning, well repair, well abandonment and production increase, the specific work flow of quickly disconnecting the landing string and safely evacuating the platform is as follows:

S1: When encountering special bad weather or emergency, the communication unit B804 and the internal sensors of the underwater intelligent electric control system 7 transmit the working status of the underwater electric safety protection system valve, the internal temperature of the underwater electric safety protection system, the internal humidity of the underwater electric safety protection system, the internal environmental parameters of the underwater intelligent electric control system 7, the working status of the test string, the underwater real-time environment and other data to the data acquisition system 706; the data acquisition system 706 transmits the collected underwater environmental information to the microprocessor 707,

S2: The microprocessor 707 uploads the obtained data information to the CPU 202. After the CPU 202 obtains the data and analyzes it, it is concluded that emergency release is required. The staff controls the CPU 202 to send an emergency release instruction downward through the human-computer interaction display screen 201;

S3: CPU 202 sends a signal to the underwater intelligent electric control system 7 through the optical fiber communication unit 301, and the accumulator A 701 obtains the power transmitted from the upper part, turns off the underwater intelligent electric heating system 9 through the temperature control device 901, and turns off the full-electric underwater test tree safety valve 801 through the motor controller 702, shears the internal steel wire or coiled tubing, and cuts off the upward return fluid in the test string;

S4: closing the all-electric check valve 803 through the motor controller 702 to block the fluid above the all-electric check valve 803 in the test string;

S5: Control the all-electric underwater test tree connector 802 to be disconnected through the motor controller 702, and control the pressure relief protector through the motor controller 702 to discharge the fluid blocked between the all-electric underwater test tree safety valve 801 and the all-electric check valve 803 into the watertight pipe string;

S6: The pressure sensor in the all-electric check valve 803 monitors the internal pressure data in real time, and the obtained data is transmitted to the CPU 202 through the data acquisition system 706 and the microprocessor 707. When the human-computer interactive display screen 201 shows that the closed pressure in the all-electric check valve 803 has been released, the upper test string is lifted out of the all-electric blowout preventer system 5, and the full-sealing gate of the all-electric blowout preventer system 5 is closed to separate the environmental control space of the lower test string, realize the emergency release of the sitting string, and evacuate safely together with the drilling platform.

After the marine environment is stable, the test string can be docked through the landing string system to quickly resume deep-water testing operations. The landing string connection workflow is as follows:

S1: After the ocean situation stabilizes or the emergency situation is resolved, open the full-seal gate of the all-electric blowout preventer valve system 5 and re-enter the landing string;

S2: Control the all-electric underwater test tree connector 802 to reconnect through the motor controller 702;

S3: The all-electric check valve 803 is opened through the motor controller 702, and the pressure relief protector therein is closed. The all-electric check valve circuit is turned on, and the all-electric underwater test tree safety valve 801 is opened through the motor controller 702 to complete the reconnection of the test string and resume the deepwater test operation.

Obviously, the above embodiments are merely examples for clear explanation, and are not intended to limit the implementation methods. For ordinary technicians in the relevant field, other different forms of changes or modifications can be made based on the above description. It is not necessary and impossible to list all the implementation methods here. The obvious changes or modifications derived from them are still within the protection scope of the invention.

Claims (10)

1. An underwater fully electric control string landing system, characterized in that it comprises a platform high-voltage power system (1), a platform visualization control system (2), a power and communication transmission system (3), an umbilical cable laying system (4), a fully electric blowout preventer system (5), an underwater power regulation system (6), an underwater intelligent electric control system (7), an underwater electric safety protection system (8) and an underwater intelligent electric heating system (9); the platform high-voltage power system (1) comprises a power generation device (101), a backup power supply system (102) and a transformer (103); the platform visualization control system (2) comprises a human-computer interaction display screen (201), a CPU (202) and a PLC (203); the power and communication transmission system (3) comprises an optical fiber communication unit (301) and a power unit (302); the umbilical cable laying system (4) comprises an umbilical cable winch (401) and an umbilical cable (402); the fully electric blowout preventer system (5) comprises a visualization monitoring camera I (50 1); the underwater power control system (6) comprises a signal conversion unit (601) and an underwater transformer (602); the underwater intelligent electric control system (7) comprises a battery A (701), a motor controller (702) and an underwater intelligent control unit, wherein the underwater intelligent control unit comprises a humidity sensor (703), a temperature sensor (704), a pressure sensor (705), a data acquisition system (706), a microprocessor (707), a communication unit A (708) and a battery B (709); the underwater electric safety protection system (8) comprises an all-electric underwater test tree safety valve (801), an all-electric underwater test tree connector (802), an all-electric check valve (803), a communication unit B (804) and a visual monitoring camera II (805); the underwater intelligent electric heating system (9) comprises a temperature control device (901), a time relay (902) and an electric heating tube (903), wherein the power generation device (101) and the backup power supply system ( 102), the transformer (103), the backup power supply system (102) and the transformer (103) are electrically connected to form a platform high-voltage power system (1), the platform high-voltage power system (1) and the platform visualization control system (2), the power and communication transmission system (3) are electrically connected, the human-machine interaction display screen (201) and the CPU (202) are electrically connected, the CPU (202) and the PLC (203) are electrically connected, the umbilical cable (402) is installed on the umbilical cable winch (401), and the assembly The umbilical cable deployment system (4) is formed, the all-electric blowout preventer system (5) is connected to the ground platform through the umbilical cable (402), the optical fiber communication unit (301) and the power unit (302) are connected to the visual monitoring camera I (501) through the umbilical cable (402), the optical fiber communication unit (301) is connected to the signal conversion unit (601) through the umbilical cable (402), the power unit (302) is connected to the underwater transformer (602) through the umbilical cable (402), and the storage battery B (709) is connected to the underwater transformer (601). ), a data acquisition system (706) and a communication unit A (708) are electrically connected to a microprocessor (707), a humidity sensor (703), a temperature sensor (704) and a pressure sensor (705) are installed on the interface of the data acquisition system (706) to form an underwater intelligent control unit, a signal conversion unit (601) is connected to the underwater intelligent control unit via an umbilical cable (402), and an underwater transformer (602) is connected to the underwater intelligent control unit and the accumulator A (701) via an umbilical cable. The umbilical cable (402) is connected to the temperature control device (901) and the time relay (902) and the electric heating tube (903) to form an underwater intelligent electric heating system (9); the accumulator A (701) and the underwater intelligent electric heating system (9) are electrically connected through the umbilical cable (402); the accumulator A (701) and the visual monitoring camera II (805) are electrically connected; the accumulator A (701) and the motor controller (702) are electrically connected; and the motor controller (702) and the all-electric valve mechanism are electrically connected. 2. According to claim 1, an underwater fully electric control column landing system is characterized in that the signal conversion unit (601) is used to convert the upper long-distance optical fiber signal into copper twisted pair DSL communication, making the control system more reliable. 3. According to claim 1, an underwater fully electric-controlled column landing system is characterized in that the power and communication transmission system (3) transmits high voltage current to the underwater power control system (6), and the underwater transformer (602) converts the high voltage transmitted from the upper part into the low voltage required by the underwater intelligent electric control system (7) and completes the distribution of electricity. 4. According to claim 1, an underwater fully electric control column landing system is characterized in that the battery A (701) receives power from the upper part, can store electricity, provide power for the underwater electric safety protection system (8), and can switch the working mode from continuous power supply to intermittent power supply, thereby greatly reducing power consumption. 5. An underwater fully electrically controlled string placement system according to claim 1, characterized in that the umbilical cable (402) includes an electrical cable and an optical fiber communication cable, the electrical cable is used for power transmission in the system, and the optical fiber communication cable is used for transmitting optical fiber communication signals. 6. According to claim 1, an underwater fully electric control column landing system is characterized in that the signal conversion unit (601) provides communication redundancy for underwater equipment, the power unit (302) provides redundant power supply for underwater equipment, and the underwater intelligent electric control system (7) and the underwater electric safety protection system (8) are both redundantly configured to improve the reliability of the control system. 7. An underwater fully-electrically controlled column placement system according to claim 1, characterized in that a storage battery is provided in the underwater intelligent control unit to supply power to a data acquisition system (706) and a microprocessor (707) in the underwater intelligent control unit. 8. An underwater fully-electrically controlled string placement system according to claim 1, characterized in that the data acquisition system (706) is provided with a plurality of data transmission interfaces for collecting status information of underwater equipment and monitoring the working status of the control system in real time. 9. An underwater fully electric-controlled string placement system according to claim 1, characterized in that a temperature control device (901), a time relay (902) and an electric heating tube (903) are provided in the underwater intelligent electric heating system (9), and the timing operation and timing shutdown of the temperature control device (901) are realized through the cooperation of the temperature control device (901) and the time relay (902), so that the wellhead temperature can be intelligently controlled to inhibit the formation of hydrates. 10. A method for setting a fully electric underwater string system according to any one of claims 1 to 9, characterized in that it comprises the following steps: Emergency rescue steps: S1: When encountering special bad weather or emergency, the communication unit B (804) and the internal sensors of the underwater intelligent electric control system (7) transmit the data of the working state of the underwater electric safety protection system valve, the internal temperature of the underwater electric safety protection system, the internal humidity of the underwater electric safety protection system, the internal environmental parameters of the underwater intelligent electric control system (7), the working state of the test string, and the underwater real-time environment to the data acquisition system (706); the data acquisition system (706) transmits the collected underwater environmental information to the microprocessor (707). S2: The microprocessor (707) uploads the obtained data information to the CPU (202). After the CPU (202) obtains the data and analyzes it, it is concluded that emergency release is required. The staff controls the CPU (202) to send an emergency release instruction downward through the human-computer interaction display screen (201); S3: The CPU (202) sends a signal to the underwater intelligent electric control system (7) through the optical fiber communication unit (301), and the accumulator A (701) obtains the power transmitted from the upper part, turns off the underwater intelligent electric heating system (9) through the temperature control device (901), and turns off the full-electric underwater test tree safety valve (801) through the motor controller (702), cuts the internal steel wire or coiled tubing, and cuts off the upward return fluid in the test string; S4: closing the all-electric check valve (803) through the motor controller (702) to block the fluid above the all-electric check valve (803) in the test string; S5: Control the all-electric underwater test tree connector (802) to be disconnected through the motor controller (702), and control the pressure relief protector through the motor controller (702) to discharge the fluid blocked between the all-electric underwater test tree safety valve (801) and the all-electric check valve (803) into the watertight pipe string; S6: The pressure sensor in the all-electric check valve (803) monitors the internal pressure data in real time. The obtained data is transmitted to the CPU (202) through the data acquisition system (706) and the microprocessor (707). When the human-computer interactive display screen (201) shows that the trapped pressure in the all-electric check valve (803) has been released, the upper test string is lifted out of the all-electric blowout preventer system (5), the full-sealing gate of the all-electric blowout preventer system (5) is closed, the environmental control space of the lower test string is separated, and the emergency release of the sitting string is realized, and the drilling platform is safely evacuated. Steps to reconnect: S1: After the ocean situation stabilizes or the emergency situation is resolved, open the full-seal gate of the all-electric blowout preventer valve system (5) and re-insert the landing string; S2: Controlling the all-electric underwater test tree connector (802) to reconnect via the motor controller (702); S3: The electric check valve (803) is opened through the motor controller (702), and the pressure relief protector therein is closed, the circuit of the electric check valve is connected, and the electric underwater test tree safety valve (801) is opened through the motor controller (702), the test string is reconnected, and the deepwater test operation is resumed.