Marine electric fracturing skid control system and control method thereof

Abstract

The invention relates to the technical field of offshore oil and gas field electric fracturing equipment control, and discloses a marine electric fracturing skid control system which comprises a main controller. The main controller is connected with a man-machine interaction interface, a motor control module, an alarm module, a maintenance module, a signal calibration module, a pressure monitoring module, a fluid end lubrication control module, a displacement control module, a heater control module, a suction valve control module and a sound-light alarm module. The invention further discloses a control method of the marine electric fracturing skid control system. According to the marine electric fracturing sledge control system and the control method thereof, comprehensive, intelligent and efficient control over the marine electric fracturing sledge is achieved, the operation safety, reliability and efficiency are improved, the equipment damage risk and the operation difficulty are reduced, and the marine electric fracturing sledge control system and the control method are particularly suitable for fracturing operation in the complex offshore environment.

Description

Technical Field

[0001] This invention relates to the field of control technology for electric fracturing equipment in offshore oil and gas fields, specifically to a marine electric fracturing skid control system and its control method. Background Technology

[0002] With the continuous development of offshore oil and gas extraction technology, offshore fracturing operations are becoming increasingly important as a means to improve the recovery rate of low-permeability oil and gas fields. Traditional offshore fracturing operations mainly rely on imported equipment, and the core technologies are controlled by foreign companies. With the increasing efforts in the development of domestic offshore oil and gas resources, the demand for offshore fracturing equipment with independent intellectual property rights is becoming increasingly urgent.

[0003] As the core equipment in fracturing operations, the control system of the fracturing skid directly affects the safety, reliability, and efficiency of the operation.

[0004] However, traditional fracturing skid control systems are often limited in function, lack integration, are complex to operate, and lack intelligent management capabilities. With the development of electric drive technology, electric fracturing skids are gradually replacing traditional diesel-powered fracturing skids due to their high efficiency, environmental friendliness, and intelligent features.

[0005] However, existing electric fracturing skid control systems still have the following problems: The control functions are not comprehensive enough and cannot meet complex operational requirements; Inadequate equipment protection mechanisms can easily lead to equipment damage, increasing maintenance costs and the risk of work interruption. The user interface is not user-friendly, making it difficult to perform quick and accurate operations.

[0006] Therefore, there is an urgent need for a highly integrated, highly automated, and highly intelligent control system to meet the needs of fracturing operations in complex offshore environments, fill the gap in domestic offshore oilfield electric fracturing technology and engineering, and improve my country's ability to enter, explore, and develop deep-sea oil fields. Summary of the Invention

[0007] The purpose of this invention is to address the shortcomings of the above-mentioned technologies by providing a marine electric fracturing skid control system and its control method, which enables comprehensive, intelligent, and efficient control of the marine electric fracturing skid, improves operational safety, reliability, and efficiency, reduces the risk of equipment damage and operational difficulty, and is particularly suitable for fracturing operations in complex marine environments.

[0008] To achieve the above objectives, the marine electric fracturing skid control system designed in this invention includes a main controller, which is connected to: Human-computer interface: Input control commands and display system status; Motor control module: controls the start and stop of the motor; Alarm module: Set alarm levels and alarm actions. When an alarm occurs, it will display the corresponding alarm information according to the alarm configuration and generate corresponding actions according to the configuration requirements, such as stopping the machine or sending an alarm signal. Maintenance module: Manages the maintenance of the main motor, large pump and gearbox, sets maintenance cycles and reminder rules, and generates corresponding alarm prompts when maintenance is due to remind operators to perform maintenance work; Signal calibration module: calibrates various acquired signals, such as pressure signals and speed signals, to ensure signal accuracy and provide reliable data support for precise system control; Pressure monitoring module: Monitors the pressure of the plunger pump, transmits the pressure signal to the main controller, and implements overpressure protection; Hydraulic end lubrication control module: Adjusts the hydraulic end electro-lubrication switch for automatic lubrication, and collects hydraulic end operation and fault signals to promptly detect and handle abnormal conditions of the hydraulic end; Displacement control module: Adjusting the motor speed enables precise control of the plunger pump displacement. Operators can directly set or adjust the plunger pump displacement by adding or subtracting. The system automatically adjusts the motor speed according to the set displacement, so that the plunger pump can quickly reach the displacement required by the user. Heater control module: controls the start and stop of the heater, and is equipped with a one-button start button for the heater. When the button is clicked, the main motor heater, the power end heater, and the cooling motor heater will start working automatically. Suction valve control module: can be configured to activate or deactivate the suction valve interlock. When activated, it interlocks the liquid supply suction valve and the acid supply suction valve, allowing only one of the liquid supply suction valve and the acid supply suction valve to be opened, thus avoiding safety issues caused by misoperation. Audible and visual alarm module: Used to configure alarm activation and silencing. After silencing (not activating the audible and visual alarm), a new high-level alarm will automatically activate the audible and visual alarm to attract the operator's attention.

[0009] Preferably, the motor control module includes a main motor control module and an auxiliary motor control module. The main motor control module controls the start and stop of the main motor and directly sets the speed of the main motor. The auxiliary motor control modules control the start and stop of the auxiliary motors separately.

[0010] Preferably, the auxiliary motor control module includes a standby start and a standby stop. When the standby start button is pressed, the auxiliary motors start automatically in sequence. When the standby stop button is pressed, all auxiliary motors stop automatically.

[0011] Preferably, the overpressure protection configuration of the pressure monitoring module is as follows: when the pressure exceeds the overpressure setting pressure, the machine will automatically stop; if the pressure exceeds the overpressure setting pressure by more than 20 MPa and the machine still fails to stop, the system will automatically issue an emergency stop command to execute the emergency stop, ensuring the safety of equipment and personnel; a pressure limit pressure is set, and when the pressure reaches the pressure limit pressure, the machine will automatically reduce speed and limit pressure.

[0012] Preferably, the automatic lubrication logic of the hydraulic end lubrication control module is as follows: after the motor starts, lubrication is automatically turned on and stopped after working for T1 seconds; the lubrication stop time T2 is calculated based on the motor speed and the set lubrication rest rotation speed; the process of lubrication for T1 seconds and stop for T2 seconds is executed cyclically.

[0013] A control method for a marine electric fracturing skid control system includes the following: system initialization, self-testing and parameter setting; receiving and executing operation commands through the human-machine interface; during use: the alarm module monitors the equipment status in real time and triggers alarm processing; the maintenance module issues maintenance reminders according to the maintenance cycle; the signal calibration module performs signal calibration periodically; the pressure monitoring module implements pressure protection control; the hydraulic end lubrication control module performs hydraulic end lubrication control; the displacement control module achieves precise displacement control; the heater control module controls the heater's start and stop; the suction valve control module manages the suction valve interlock status; and the audible and visual alarm module processes audible and visual alarms.

[0014] Preferably, when the pressure monitoring module performs overpressure protection, it sets the overpressure setting pressure P2, the overpressure limit pressure P3 = P2 + 20 MPa, and the pressure limiting pressure P4 = P2 - Pe, where Pe is the overpressure protection warning phase difference value; when the pressure exceeds P4, it automatically reduces speed and limits pressure; when it exceeds P2, it stops; and when it exceeds P3, it stops urgently.

[0015] Preferably, when the hydraulic end lubrication control module performs hydraulic end lubrication control, it automatically or manually adjusts the hydraulic end electro-lubrication switch according to the settings of the hydraulic end lubrication control module, and processes the hydraulic end operation and fault signals.

[0016] Preferably, the manual lubrication logic is as follows: after receiving a forced lubrication command from the operator through the human-machine interface, the hydraulic end electro-lubrication switch is normally open; after the forced lubrication command is closed, the hydraulic end electro-lubrication switch is deactivated.

[0017] Preferably, the automatic lubrication logic is as follows: after the motor starts, lubrication is automatically turned on, lubrication is performed for T1 seconds, then rest for P revolutions, the lubrication stop time T2 is calculated by dividing the current motor speed by P, and then lubrication continues for T1 seconds, and the above process is repeated.

[0018] Compared with the prior art, the present invention has the following advantages: 1. It achieves comprehensive, intelligent, and efficient control of marine electric fracturing skids, improving operational safety, reliability, and efficiency, and reducing the risk of equipment damage and operational difficulty; 2. Comprehensive functions: It covers a variety of functions such as motor control, alarm processing, maintenance, signal calibration, pressure protection, hydraulic end lubrication, and displacement control, meeting the complex operational needs of marine electric fracturing skids; 3. High level of intelligence: It has many automatic control functions, such as automatic adjustment of motor speed to achieve displacement control, automatic alarm handling, automatic maintenance reminders, etc., which reduce manual intervention and improve work efficiency and accuracy; 4. High safety: It has safety protection mechanisms such as overpressure protection, pressure limiting protection, and suction valve interlock, as well as complete alarm and emergency stop functions, effectively ensuring the safety of equipment and personnel. Attached Figure Description

[0019] Figure 1 This is a schematic diagram of the marine electric fracturing skid control system of the present invention; Figure 2 This is a flowchart of the pressure protection logic in this invention; Figure 3 This is a flowchart of the lubrication control logic in this invention; Figure 4 This is a flowchart of the inhalation valve interlock logic in this invention; Figure 5 This is a flowchart of the sound and light alarm and silencing logic in this invention. Detailed Implementation

[0020] The technical solution of the present invention will now be clearly and completely described with reference to the accompanying drawings. Obviously, the described embodiments are only some, not all, of the embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0021] The marine electric fracturing skid control system described in this embodiment includes a main controller connected to various sensors and actuators. As the core of the system, the main controller receives signals collected by the sensors and issues control commands according to preset control logic to drive the actuators. Sensors are used to collect operating parameters of the equipment, such as pressure and temperature. Actuators include motors, valves, heaters, etc., used to implement specific control operations on the equipment.

[0022] In this embodiment, the main controller is a PLC control module, specifically a SIEMENS product with model number 1511-1PN SIPLUS.

[0023] like Figure 1As shown, a marine electric fracturing skid control system includes a main controller, which is connected to: Human-computer interface: Input control commands and display system status; Motor control module: controls the start and stop of the motor; Alarm module: Set alarm levels and alarm actions; Maintenance module: Set maintenance cycles and reminder rules; Signal calibration module: calibrates various types of acquired signals; Pressure monitoring module: Monitors the pressure of the plunger pump, transmits the pressure signal to the main controller, and implements overpressure protection; Hydraulic end lubrication control module: Adjusts the hydraulic end electro-lubrication switch for automatic lubrication, and collects hydraulic end operation and fault signals to promptly detect and handle abnormal conditions of the hydraulic end; Displacement control module: Adjusts the motor speed to achieve precise control of the plunger pump displacement; Heater control module: controls the start and stop of the heater; Suction valve control module: realizes interlock between liquid supply suction valve and acid supply suction valve, allowing only one of the liquid supply suction valve and acid supply suction valve to be opened; Audible and visual alarm module: used to configure alarm activation and silencing.

[0024] The above-mentioned functional modules work together, and the main controller stores software programs to implement the functions of each module through programming.

[0025] Specifically, in this embodiment, the motor control module includes a main motor control module and an auxiliary motor control module. The main motor control module controls the start and stop of the main motor and directly sets the main motor speed. The auxiliary motor control modules individually control the start and stop of each auxiliary motor. The auxiliary motor control module includes a standby start and a standby stop function. When the standby start button is pressed, the auxiliary motors start automatically in sequence. When the standby stop button is pressed, all auxiliary motors stop automatically.

[0026] The overpressure protection configuration of the pressure monitoring module is as follows: automatic shutdown when the pressure exceeds the overpressure setting pressure; emergency stop when the pressure exceeds the overpressure setting pressure by more than 20 MPa; and automatic speed reduction and pressure limiting when the pressure reaches the set pressure.

[0027] The automatic lubrication logic of the hydraulic end lubrication control module is as follows: after the motor starts, lubrication is automatically turned on and stopped after working for T1 seconds; the lubrication stop time T2 is calculated based on the motor speed and the set lubrication rest rotation speed; the process of lubrication for T1 seconds and stopping for T2 seconds is executed cyclically.

[0028] The control method of the marine electric fracturing skid control system in this embodiment includes the following: system initialization, self-testing and parameter setting, receiving and executing operation commands through the human-machine interface; during use: the alarm module monitors the equipment status in real time and triggers alarm processing; the maintenance module issues maintenance reminders according to the maintenance cycle; the signal calibration module performs signal calibration periodically; the pressure monitoring module implements pressure protection control; the hydraulic end lubrication control module performs hydraulic end lubrication control; the displacement control module achieves precise displacement control; the heater control module controls the start and stop of the heater; the suction valve control module manages the interlock status of the suction valve; and the audible and visual alarm module processes audible and visual alarms.

[0029] For the main motor control module, this embodiment uses an MD500-PN1 Profinet communication expansion card to communicate with the frequency converter. When the user issues a main motor start command, the main motor control module sends a start signal to the main motor through the communication expansion card, and the main motor starts running; when the user issues a stop command, it sends a stop signal, and the main motor stops running. After the main motor starts, the user can directly set the main motor speed through the human-machine interface, or automatically control the main motor speed according to a preset displacement.

[0030] For the auxiliary motor control module, when the user presses the standby start button, the auxiliary motor control module receives the signal and sends start signals to each auxiliary motor in sequence, and the auxiliary motors start automatically; when the standby stop button is pressed, a stop signal is sent, and the auxiliary motors stop automatically.

[0031] The alarm module collects various system parameters in real time, such as pressure and temperature, and compares them with the thresholds configured in the alarm settings. When a parameter exceeds the alarm threshold, it issues a corresponding alarm notification according to the alarm configuration, such as an audible and visual alarm or displaying alarm information on the screen. Simultaneously, it executes corresponding alarm actions according to the configuration requirements, such as automatic shutdown or emergency stop. Specifically, in this embodiment, the alarm module supports configuring four alarm levels and three alarm actions. The four alarm levels, from lowest to highest, are: Normal, Maintenance, Alarm, and Critical; the three alarm actions are: No Action, Shutdown, and Emergency Stop.

[0032] The maintenance module records information such as the maintenance cycle and last maintenance date for the main motor, large pump, and gearbox. It periodically checks if the maintenance cycle is due and generates an alarm if it is, reminding the user to perform maintenance. After completing the maintenance, the user can confirm it on the human-machine interface, and the system will update the maintenance information.

[0033] For the signal calibration module, when it is necessary to calibrate the acquired signal, the user can access the signal calibration module through the human-machine interface. The signal calibration module calibrates the acquired signal according to the standard signal source, adjusts the measurement error of the sensor, and ensures the accuracy of the signal.

[0034] For the pressure monitoring module, the pressure monitoring module monitors the plunger pump pressure in real time during operation, setting the overpressure set pressure P2, the overpressure limit pressure P3 = P2 + 20 MPa, and the pressure limiting pressure P4 = P2 - Pe, where Pe is the overpressure protection warning phase difference value; when the pressure exceeds P4, the pump automatically reduces speed and limits pressure; when it exceeds P2, the pump stops; and when it exceeds P3, the pump stops immediately. Figure 2 As shown, when the plunger pump pressure exceeds the pressure limit (this value is settable in this embodiment, with the default being the overpressure setting pressure - 5 MPa), the system automatically reduces the speed of the main motor according to the set frequency. If the plunger pump pressure continues to rise and exceeds the set overpressure setting pressure, the system controls the main motor to stop. If the plunger pump pressure continues to rise and exceeds the overpressure limit pressure (this value is the overpressure setting pressure + 20 MPa in this embodiment) and the main motor still has not stopped, the system automatically issues an emergency stop command to ensure equipment safety.

[0035] For the hydraulic end lubrication control module, the hydraulic end electro-lubrication switch is automatically or manually adjusted according to the module's settings to control the hydraulic end lubrication and process hydraulic end operation and fault signals. The automatic lubrication logic is as follows: after the motor starts, lubrication is automatically activated. After lubrication operation for T1 seconds, the motor rests for P revolutions. The lubrication stop time T2 is calculated by dividing the current motor speed by P, and then lubrication continues for T1 seconds, repeating the above process. Figure 3 As shown, if the user manually turns on forced lubrication through the human-machine interface, the hydraulic end lubrication power supply will be turned on. If forced lubrication is not turned on, the system needs to determine whether the main motor is running. After the main motor is running, the lubrication power supply will be turned on automatically. After the system monitors that the lubrication time has reached the set time T1, the lubrication power supply will be turned off. The system calculates the automatic lubrication stop time T2 based on the current motor speed and the set lubrication rest rotation speed. After the system monitors that the lubrication stop time has reached T2, the lubrication power supply will be turned on again, and the lubrication process will be executed in a loop.

[0036] For the displacement control module, users can directly set the displacement of the plunger pump in the displacement control module, or adjust the displacement setting value through the plus and minus buttons. The system automatically adjusts the motor speed according to the displacement set by the user, so that the actual displacement quickly reaches the value required by the user.

[0037] For the heater control module, considering the marine environment, this embodiment is equipped with heaters for the main motor, the power-end motor, and the two cooling motors. When the user clicks the heater start button, the heater control module sequentially sends start signals to the main motor heater, the power-end heater, the cooling motor 1 heater, and the cooling motor 2 heater, and each heater automatically starts working. After heating is complete, the user can manually turn off the heaters sequentially, or leave it as is; the system will automatically shut down the corresponding heaters after the user operates the main motor, the power-end motor, and the two cooling motors.

[0038] The suction valve control module has a suction valve interlock function, allowing only one of the liquid supply suction valves or the acid supply suction valve to be open at a time. This interlocking of the valves is achieved through logic control, preventing safety accidents caused by misoperation during offshore fracturing operations. Figure 4 As shown, the suction valve interlock is automatically activated each time the device is powered on. If the user cancels the suction valve interlock in the configuration on the human-machine interface, both suction valves are allowed to open simultaneously. Otherwise, each time one suction valve is opened, the system needs to determine whether the other valve is already open. The suction valve is only allowed to open if the other suction valve is closed.

[0039] For audible and visual alarm modules, such as Figure 5 As shown, the audible and visual alarm automatically activates each time the device is powered on. If a high-level alarm is triggered, both the audible and visual alarms will also activate. Users can deactivate the audible and visual alarms in the configuration settings on the human-machine interface to silence them. If the system triggers a new high-level alarm, the audible and visual alarms will automatically activate again to alert the user to pay attention and handle the alarm. Users must repeat the deactivation process to turn off the audible and visual alarms again.

[0040] In other embodiments, a large pump and motor protection module may be provided to monitor the operating status of the large pump and motor in real time, including parameters such as pressure, displacement, and power. When overload or overpower conditions are detected, the motor speed is automatically reduced at a certain frequency to protect the equipment from damage.

[0041] In the above embodiments, a one-click pressure test operation can also be set: receiving the pressure test time setting; automatically controlling the motor and pressure regulating equipment to complete the pressure test process; and monitoring parameters such as pressure and flow rate in real time during the pressure test to ensure the safety and stability of the pressure test. Similarly, convenient operation functions such as one-click heater start and one-click standby can also be set.

[0042] For ease of operation, in this embodiment, the human-computer interaction interface can switch between Chinese and English. The system switches the interface text display to the corresponding language according to the user's selection, making it convenient for users with different language backgrounds to use.

[0043] This invention relates to a marine electric fracturing skid control system and its control method, which achieves comprehensive, intelligent, and efficient control of the marine electric fracturing skid, improving operational safety, reliability, and efficiency, and reducing the risk of equipment damage and operational difficulty. It is comprehensive in function, encompassing motor control, alarm handling, maintenance, signal calibration, pressure protection, hydraulic end lubrication, and displacement control, meeting the complex operational needs of marine electric fracturing skids. It is highly intelligent, featuring multiple automatic control functions, such as automatic motor speed adjustment for displacement control, automatic alarm handling, and automatic maintenance reminders, reducing manual intervention and improving operational efficiency and accuracy. It is highly safe, possessing overpressure protection, pressure limiting protection, and suction valve interlocking safety mechanisms, as well as comprehensive alarm and emergency stop functions, effectively ensuring the safety of equipment and personnel.

[0044] It should be noted that the above description of the technical solutions is exemplary, and this specification may be embodied in different forms and should not be construed as limiting it to the technical solutions set forth herein. Rather, providing these descriptions will ensure that the disclosure of this invention is thorough and complete, and will fully convey the scope of the disclosure to those skilled in the art. Furthermore, the technical solutions of this invention are defined only by the scope of the claims.

[0045] The shapes, dimensions, ratios, angles, and figures disclosed in the description of various aspects of this specification and claims are merely examples, and therefore, this specification and claims are not limited to the details shown. In the following description, detailed descriptions of relevant known functions or configurations will be omitted where it would be determined that they unnecessarily obscure the focus of this specification and claims.

[0046] Finally, it should be noted that the above embodiments are merely representative examples of the present invention. Obviously, the present invention is not limited to the above embodiments and many variations are possible. Any simple modifications, equivalent changes, and alterations made to the above embodiments based on the technical essence of the present invention should be considered within the protection scope of the present invention.

Claims

1. A marine electric fracturing skid control system, characterized in that: Includes a main controller, which is connected to: Human-computer interface: Input control commands and display system status; Motor control module: controls the start and stop of the motor; Alarm module: Set alarm levels and alarm actions; Maintenance module: Set maintenance cycles and reminder rules; Signal calibration module: calibrates various types of acquired signals; Pressure monitoring module: Monitors the pressure of the plunger pump, transmits the pressure signal to the main controller, and implements overpressure protection; Hydraulic end lubrication control module: Adjusts the hydraulic end electro-lubrication switch for automatic lubrication, and collects hydraulic end operation and fault signals to promptly detect and handle abnormal conditions of the hydraulic end; Displacement control module: Adjusts the motor speed to achieve precise control of the plunger pump displacement; Heater control module: controls the start and stop of the heater; Suction valve control module: realizes interlock between liquid supply suction valve and acid supply suction valve, allowing only one of the liquid supply suction valve and acid supply suction valve to be opened; Audible and visual alarm module: used to configure alarm activation and silencing.

2. The marine electric fracturing skid control system as described in claim 1, characterized in that: The motor control module includes a main motor control module and an auxiliary motor control module. The main motor control module controls the start and stop of the main motor and directly sets the main motor speed. The auxiliary motor control modules control the start and stop of the auxiliary motors separately.

3. The marine electric fracturing skid control system as described in claim 2, characterized in that: The auxiliary motor control module includes standby start and standby stop. When standby start is pressed, the auxiliary motors start automatically in sequence. When standby stop is pressed, all auxiliary motors stop automatically.

4. The marine electric fracturing skid control system as described in claim 1, characterized in that: The overpressure protection configuration of the pressure monitoring module is as follows: automatic shutdown when the pressure exceeds the overpressure setting pressure; emergency stop when the pressure exceeds the overpressure setting pressure by more than 20 MPa; setting a pressure limit, and automatically reducing speed and limiting pressure when the pressure reaches the pressure limit.

5. The marine electric fracturing skid control system as described in claim 1, characterized in that: The automatic lubrication logic of the hydraulic end lubrication control module is as follows: after the motor starts, lubrication is automatically turned on and stopped after working for T1 seconds; the lubrication stop time T2 is calculated based on the motor speed and the set lubrication rest rotation speed; the process of lubrication for T1 seconds and stopping for T2 seconds is executed cyclically.

6. A control method for a marine electric fracturing skid control system as described in claim 1, characterized in that: The system includes the following components: system initialization, self-testing, and parameter setting; receiving and executing operation commands through the human-machine interface; during use: the alarm module monitors the equipment status in real time and triggers alarm processing; the maintenance module issues maintenance reminders according to the maintenance cycle; the signal calibration module performs signal calibration periodically; the pressure monitoring module implements pressure protection control; the hydraulic end lubrication control module performs hydraulic end lubrication control; the displacement control module achieves precise displacement control; the heater control module controls the heater's start and stop; the suction valve control module manages the suction valve interlock status; and the audible and visual alarm module handles audible and visual alarms.

7. The control method of the marine electric fracturing skid control system as described in claim 6, characterized in that: When the pressure monitoring module performs overpressure protection, it sets the overpressure setting pressure P2, the overpressure limit pressure P3 = P2 + 20 MPa, and the pressure limiting pressure P4 = P2 - Pe, where Pe is the overpressure protection warning phase difference value; when the pressure exceeds P4, it automatically reduces the speed and limits the pressure; when it exceeds P2, it stops; and when it exceeds P3, it stops urgently.

8. The control method of the marine electric fracturing skid control system as described in claim 6, characterized in that: When the hydraulic end lubrication control module performs hydraulic end lubrication control, it automatically or manually adjusts the hydraulic end electro-lubrication switch according to the settings of the hydraulic end lubrication control module, and processes the hydraulic end operation and fault signals.

9. The control method of the marine electric fracturing skid control system as described in claim 8, characterized in that: The manual lubrication logic is as follows: after receiving a forced lubrication command from the operator through the human-machine interface, the hydraulic end electro-lubrication switch is normally open; after the forced lubrication command is closed, the hydraulic end electro-lubrication switch is deactivated.

10. The control method of the marine electric fracturing skid control system as described in claim 8, characterized in that: The automatic lubrication logic is as follows: after the motor starts, lubrication is automatically turned on. After lubrication for T1 seconds, it rests for P revolutions. The lubrication stop time T2 is calculated by dividing the current motor speed by P. Then, lubrication continues for T1 seconds. The above process is repeated.

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