System for comprehensively controlling electric submersible pump by using multiple parameters

Abstract

The utility model relates to a system for comprehensively controlling an electric submersible pump by using multiple parameters, which comprises an electric submersible pump underground assembly, a control device and a sensor, the sensor comprises a capillary pressure sensor (13), a capillary pressure sensor (13) and a capillary pressure sensor (13), the capillary pressure sensor (13) is positioned in a shaft (7) and is used for measuring the pressure of a suction inlet of the electric submersible pump, and the capillary pressure sensor (13) is used for measuring the pressure of the suction inlet of the electric submersible pump; a nitrogen cylinder (14) and an actuator are combined to form a capillary pressure measuring system; the temperature sensor (16) is arranged near the submersible motor (1) and is used for monitoring the temperature of the submersible motor in real time; the three-phase current sensor (15) is connected with the submersible motor (1) and is used for measuring the three-phase current magnitude and the fluctuation value of the submersible motor (1); the casing pressure sensor (17) is arranged in the shaft (7) and is used for measuring the casing pressure of the oil well; and the mass flow meter (18) is connected with an outlet of the electric submersible pump and is used for measuring the displacement of the electric submersible pump. According to the system, a plurality of parameters are comprehensively considered, so that liquid level misinformation caused by faults of the liquid level sensor or other accidental factors is effectively avoided.

Description

Technical Field

[0001] The utility model belongs to the technical field of submersible electric pump application in oilfield mining industry, and relates to a system for timely testing and comprehensive analysis of various working parameters of submersible electric pumps, and judging and adjusting the working state of the equipment according to the analysis results. Background Art

[0002] Submersible electric pump is a kind of high-efficiency oil extraction equipment designed for oil field crude oil lifting. Due to its high production efficiency and long maintenance-free cycle, it has been widely used in the field of oil field extraction at home and abroad in recent years. However, such equipment usually has a relatively high manufacturing cost, and once a failure occurs, it is difficult to repair, which to some extent limits its wider promotion.

[0003] Submersible electric pump equipment usually includes downhole components and uphole components. The downhole components consist of four parts: submersible motor, motor protector, oil-gas separator and submersible pump; the uphole components include power supply system and control system; these two parts are connected by submersible cables to ensure stable transmission of energy and signals.

[0004] When selecting a submersible pump, it is necessary to consider a number of key factors, such as the actual production of the well, the burial depth, the diameter of the well casing, and the temperature of the downhole environment. When the equipment is properly selected and can achieve a balance between the well production and the equipment lifting capacity, the submersible pump can operate stably for a long time without frequent adjustments. For wells with higher production, it is easier to meet the above conditions. Even if there is a small fluctuation in production, the submersible pump can respond quickly through its adaptive mechanism. When the liquid level changes, the head of the submersible pump will be adjusted accordingly to maintain the stability of the displacement. Specifically, when the liquid level rises, the head decreases and the displacement automatically increases; when the liquid level drops, the head increases and the displacement automatically decreases. This change will automatically restore the liquid level and the equipment will return to steady-state operation. Therefore, for high-yield wells, submersible pumps can usually rely on their adaptive ability to work stably for a long time without human intervention and adjustment.

[0005] However, for some low-yield oil wells, the adaptive ability of the equipment alone often cannot guarantee their stable operation. This is because the production of such oil wells is low (generally less than 30m 3 / d), once its production decreases in a short period of time, due to the small diameter of the wellbore and the small amount of liquid stored, it is likely that the liquid level will drop rapidly, or even be emptied in a very short time, causing the submersible motor to quickly overheat and burn due to loss of cooling. Under such working conditions, it is difficult to respond in time and effectively protect the safety of the equipment by relying solely on the adaptive ability of the equipment itself. In addition, the production of low-yield oil wells themselves is often not very stable and fluctuates frequently, which brings great challenges to the selection and maintenance of equipment and is very likely to cause accidental damage to the equipment. Especially for deep well small-displacement submersible electric pumps, their service life is generally short, usually less than one year, far less than that of large-displacement submersible electric pumps.

[0006] Therefore, for small-displacement submersible electric pumps, strengthening the monitoring mechanism is particularly critical. Once abnormal data is found, timely intervention and adjustment must be made to ensure that the equipment is not damaged. At present, although some literature has been published on closed-loop control of the working state of submersible electric pumps, most of them are still in the experimental research stage, and there are few actual engineering applications. At present, the common control method is to use the dynamic liquid level height of the well as the independent variable of the control. By establishing the relationship between the dynamic liquid level height and the working frequency of the submersible motor, PID control is used to maintain the stability of the liquid level, so as to adjust the motor working frequency according to the dynamic liquid level in time to achieve the purpose of protecting the submersible electric pump. However, this control method sometimes cannot fully guarantee the reliability of the control. Because the actual liquid level in the well is to be tested by sensors, the existing types of sensors cannot guarantee the absolute reliability of the data. Among the several common measurement methods currently used, the capillary pressure measurement method is used to measure the liquid level. Although the principle is relatively simple, it is less affected by the outside world. However, in some cases, such as when the casing pressure fluctuates or the oil well contains a lot of gas, the data may be erroneous. For example, the pressure measured by the capillary is the superposition of the static pressure of the liquid column and the casing pressure. When the casing pressure is too high, the measured pressure data cannot truly reflect the liquid level. For another example, for oil wells with a lot of gas, the flow of gas in the casing will cause a large number of bubbles or foam in the liquid, and the measured data will hardly reflect the real liquid level. At the same time, the test element itself may also be blocked, corroded and perforated, and the gas is not replenished in time, which will also lead to data errors.

[0007] Another method of measuring the liquid level is to use a pressure sensor downhole. This is a more advanced method in principle. It requires modulating the signal carrier to the power cable of the submersible pump, and then demodulating and amplifying it on the ground. However, since the electronic components are working in a very harsh environment underground, they are easily interfered with or damaged; the carrier and demodulation process are also easily interfered with by the large current in the power cable, so the reliability of the data is difficult to guarantee. If the measured liquid level data is wrong, the entire closed-loop control will cause an output command error due to an input error, which may misadjust the working state of the submersible pump and accelerate equipment damage.

[0008] Therefore, there is an urgent need in the art for a multi-parameter comprehensive control system for submersible electric pumps. Utility Model Content

[0009] The utility model proposes a system for comprehensive control of submersible electric pumps with multiple parameters, which overcomes the problem in the prior art that the control system issues an erroneous adjustment instruction to the submersible electric pump due to a single parameter detection error, thereby causing accidental damage to the equipment. The system provided by the utility model can be used to control submersible electric pumps with various parameters, but it is more important for deep well and small displacement submersible electric pumps.

[0010] The utility model adopts the following technical solutions:

[0011] A system for comprehensive control of a submersible electric pump by multiple parameters, the system comprising:

[0012] Submersible electric pump downhole components, control devices and sensors, sensors include:

[0013] The capillary pressure sensor is located in the wellbore and is used to measure the pressure at the suction port of the submersible electric pump. It is combined with a nitrogen bottle and an actuator to form a capillary pressure measurement system.

[0014] The temperature sensor is installed near the submersible motor to monitor the motor temperature in real time;

[0015] A three-phase current sensor is connected to the submersible motor and is used to measure the three-phase current size and fluctuation value of the submersible motor;

[0016] Casing pressure sensor, installed in the wellbore, is used to measure the casing pressure of the oil well.

[0017] The mass flow meter is connected to the outlet of the submersible electric pump and serves as a tipping bucket output liquid metering device to measure the displacement of the submersible electric pump.

[0018] Furthermore, the downhole assembly comprises:

[0019] Submersible motor, used to drive the system;

[0020] A motor protector, which is connected to the submersible motor and is used to protect the submersible motor from abnormal operating conditions;

[0021] An oil-gas separator is arranged in the wellbore of the oil well and connected to the motor protector, and is used to separate the gas and liquid in the produced fluid of the oil well;

[0022] The submersible pump is connected to the oil-gas separator and the oil pipe, has a multi-section impeller structure, and is driven by a submersible motor to rotate at high speed to generate a lifting force to lift the oil well output fluid to the ground;

[0023] The submersible motor, the motor protector, the oil-gas separator and the submersible pump are coaxially arranged in the wellbore of the oil well, and the displacement of the submersible pump can be adjusted and controlled by controlling the working frequency of the submersible motor.

[0024] Furthermore, the control device of the system includes a main control cabinet and a multi-parameter integrated control unit cabinet. The main control cabinet is used to receive signals about the displacement, pressure or other relevant parameters of the submersible pump, and adjust the operating frequency of the submersible motor according to the received signals, so as to achieve precise control of the displacement of the submersible pump. The main control cabinet can communicate with the submersible motor via wired or wireless means to achieve remote monitoring and regulation.

[0025] Furthermore, in the above control device, a multi-parameter integrated control unit cabinet is installed on the ground, and contains multiple single-chip microcomputers and PLCs as slave computers, and an industrial computer as a host computer, which is used to receive and process data collected by various sensors.

[0026] Furthermore, the data acquisition module, data transmission module, data processing module and display module of the system are electrically connected and arranged inside the multi-parameter integrated control unit cabinet. They can monitor and analyze the working status of the submersible electric pump system in real time based on the data collected by multiple sensors, and display the analysis results through the display module.

[0027] Furthermore, in the system, the main control cabinet is electrically connected to the submersible motor and the three-phase current sensor, the multi-parameter integrated control unit cabinet is connected to the main control cabinet by wired or wireless means, and the multi-parameter integrated control unit cabinet sends the frequency modulation instruction to the main control cabinet to realize parameter adjustment.

[0028] Furthermore, all signal receiving parts are installed in a multi-parameter integrated control unit cabinet.

[0029] Furthermore, in the capillary pressure measuring system, a capillary pressure sensor located in the wellbore is connected to a nitrogen cylinder and is remotely transmitted to a receiving circuit by an actuator.

[0030] The temperature sensor is a thermocouple sensor that is installed near the motor. Its long thermocouple is connected to the ground and received by the measurement circuit.

[0031] The three-phase current sensor transmits the data to the receiving circuit; the casing pressure measurement sensor is installed in the wellbore, and the actuator on the wellhead transmits the data to the receiving circuit; the mass flow meter uses a tipping bucket type production fluid metering device to measure and transmit the production data to the receiving circuit in real time.

[0032] Compared with the prior art, the present invention has the following beneficial effects:

[0033] 1. The main goal of the utility model is to ensure that the equipment can be adjusted quickly and accurately when any abnormality occurs in the equipment parameters by accurately sampling the five key working parameters of the submersible electric pump and combining them with comprehensive judgment, thereby effectively preventing equipment damage and ensuring its stable operation.

[0034] 2. Compared with the traditional method of adjusting the state of the submersible electric pump by relying solely on dynamic liquid level data, the system proposed by the utility model has higher accuracy and reliability. By comprehensively considering multiple parameters, the system effectively avoids false alarms of liquid levels caused by liquid level sensor failures or other accidental factors, thereby avoiding incorrect adjustments to the submersible electric pump equipment due to misjudgment, thereby significantly reducing the risk of equipment damage.

[0035] 3. The system proposed by the utility model has a high degree of versatility and can be used as an independent, modular device in conjunction with various types and specifications of submersible electric pumps. This design enables the system to be widely used in various submersible electric pump systems, providing strong support for the stable operation of the equipment. BRIEF DESCRIPTION OF THE DRAWINGS

[0036] Figure 1 Schematic diagram of the system structure for comprehensive control of submersible electric pumps using multiple parameters;

[0037] Among them, 1. Submersible motor; 2. Motor protector; 3. Oil-gas separator; 4. Submersible pump; 5. Main control cabinet; 6. Submersible cable; 7. Wellbore; 8. Oil well produced fluid; 9. Oil pipe; 10. Wellhead device; 11. Packer; 12. Oil well liquid level; 13. Capillary pressure sensor; 14. Nitrogen bottle; 15. Three-phase current sensor; 16. Temperature sensor; 17. Casing pressure sensor; 18. Mass flow meter; 19. Multi-parameter integrated control unit cabinet; 20. Command frequency modulation data remote transmission. DETAILED DESCRIPTION

[0038] The present invention is described in detail below by specific examples, but the protection scope of the present invention is not limited. Unless otherwise specified, the experimental methods used in the present invention are all conventional methods, and the experimental equipment, materials, reagents, etc. used can be obtained from commercial channels.

[0039] In order to more clearly explain the purpose, technical solutions and advantages of the present disclosure, the embodiments of the present disclosure will be described in detail below in conjunction with the accompanying drawings. It should be understood that the following description of the embodiments is intended to explain and illustrate the overall concept of the present disclosure and should not be understood as a limitation of the present disclosure. In the specification and the drawings, the same or similar reference numerals refer to the same or similar parts or components. For the sake of clarity, the drawings are not necessarily drawn to scale, and some well-known parts and structures may be omitted in the drawings.

[0040] In the description of the present invention, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inside", "outside" and the like indicate positions or positional relationships based on the positions or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying 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, the terms "first", "second", "third", "A", "B", "C" and similar words do not indicate any order, quantity or importance, but are only used to distinguish different components, are only used for descriptive purposes, and cannot be understood as indicating or implying relative importance.

[0041] In order to make the present invention more easily understood, certain technical and scientific terms are specifically defined below. Unless otherwise clearly defined elsewhere in this document, all other technical and scientific terms used herein have the meanings commonly understood by those skilled in the art to which the present invention belongs.

[0042] The utility model PLC controller includes a PCB board, a signal interface, a PLC chip, a programming cable and a computer chip, wherein the signal interface, the PLC chip and the computer chip are all fixed on the PCB board, the signal interface and the PLC chip are electrically connected through conductivity, and the programming cable is electrically connected to the output end of the computer chip. The PLC controller adopts a high-reliability programmable controller, the PLC controller includes input points and output points, and the PLC controller is configured with an A / D conversion module for collecting analog or digital quantities of various sensors.

[0043] In the control system proposed by the utility model, five sensors are used to measure four groups of independent and related data: liquid level, current, temperature, and displacement. Among them, casing pressure measurement and capillary measurement together constitute the liquid level measurement system. After the host computer obtains the data, the software performs comprehensive calculation and analysis on the data of these parameters, and judges the working state of the submersible electric pump based on this. This can avoid the misjudgment that is easy to occur when relying on only one parameter.

[0044] For example, during the monitoring process, if the liquid level is found to be significantly decreasing, but at the same time the motor current is stable, the motor temperature is not increasing, and the displacement is not significantly reduced, then it is necessary to carefully evaluate whether the liquid level measurement equipment has a large error. In this situation, you should not rush to reduce the frequency of the motor, but continue to observe the system operation status. If after a period of continuous observation, the liquid level no longer shows a downward trend, and other key parameters such as current, temperature and displacement remain stable, it means that the stable working state of the submersible electric pump system has not been damaged and no adjustment is required.

[0045] However, if the three-phase current of the motor fluctuates significantly or the motor temperature rises significantly while the liquid level drops, it indicates that the load of the motor has fluctuated unstably and the steady state of the submersible pump system has been destroyed. In this case, frequency reduction measures should be taken immediately to stabilize the system operation state. In the system provided by the utility model, this real-time monitoring and state determination function is automatically completed by the software system in the host computer without manual intervention, ensuring the timeliness and accuracy of the operation.

[0046] The working principle of the utility model is: the sensor measures five parameters, namely, downhole pressure, current fluctuation, motor temperature, production, and casing pressure. All parameters are transmitted to the upper computer program through multiple links such as transmission lines and receiving circuits, and analyzed and processed by the data processing module. When the parameters exceed the critical value set by the corresponding coefficient, the multi-parameter control unit will send an adjustment instruction to the main control cabinet to adjust the frequency of the submersible motor to stabilize the operation of the equipment. If the adjustment is invalid, an alarm will be issued.

[0047] Example 1

[0048] A system for comprehensive control of a submersible electric pump with multiple parameters, the system comprising: a submersible electric pump downhole assembly, a control device and a sensor

[0049] The downhole assembly comprises:

[0050] Submersible motor 1, used to drive the system to work;

[0051] A motor protector 2, which is connected to the submersible motor 1 and is used to protect the submersible motor 1 from abnormal operating conditions;

[0052] The oil-gas separator 3 is arranged in the oil well shaft 7 and connected to the motor protector 2, and is used to separate the gas and liquid in the oil well output fluid 8;

[0053] The submersible pump 4 is connected to the oil-gas separator 3 and the oil pipe 9, has a multi-section impeller structure, and is driven by the submersible motor 1 to rotate at high speed to generate a lifting force to lift the oil well output fluid to the ground;

[0054] Among them, the submersible motor 1, the motor protector 2, the oil-gas separator 3 and the submersible pump 4 are coaxially arranged in the oil well bore 7, and the displacement of the submersible pump 4 can be adjusted by controlling the working frequency of the submersible motor 1 to control the displacement of the submersible pump 4.

[0055] The sensor comprises:

[0056] The capillary pressure sensor 13 is located in the wellbore 7 and is used to measure the pressure in the oil wellbore 7. It is combined with the nitrogen bottle 14 and the actuator to form a capillary pressure measurement system. The capillary pressure sensor 13 is connected to the nitrogen bottle 14 and is remotely transmitted to the receiving circuit by the actuator.

[0057] The temperature sensor 16 is a thermocouple sensor installed near the submersible motor 1. Its long thermocouple is connected to the ground and received by the measuring circuit for real-time monitoring of the motor temperature.

[0058] A three-phase current sensor 15 is connected to the submersible motor 1. The three-phase current sensor transmits data to a receiving circuit to measure the three-phase current size and fluctuation value of the submersible motor 1.

[0059] The casing pressure sensor 17 is installed in the wellbore and is transmitted remotely from the actuator on the wellhead to the receiving circuit to measure the casing pressure of the oil well.

[0060] The mass flow meter 18 is connected to the outlet of the submersible pump and serves as a tipping bucket output liquid metering device to transmit the output data to the receiving circuit in real time for measuring the displacement of the submersible pump.

[0061] The control device is used to receive signals about the displacement of the submersible pump 4 or the flow rate, pressure or other relevant parameters of the oil well output fluid 8, and adjust the working frequency of the submersible motor 1 according to the received signals, so as to realize the precise control of the displacement of the submersible pump 4, wherein the control device can communicate with the submersible motor 1 by wired or wireless means to realize remote monitoring and regulation. The control device includes a multi-parameter integrated control unit cabinet 19, which is installed on the ground and contains multiple single-chip microcomputers and PLCs as lower computers, and an industrial computer as a host computer, which is used to receive and process the data collected by each sensor. The host computer performs comprehensive calculation and analysis on the data collected by the capillary pressure sensor 13, the temperature sensor 16, the three-phase current sensor 15, the casing pressure sensor 17 and the mass flowmeter 18 through software, and judges the working state of the submersible electric pump according to the analysis results. In addition to the above-mentioned multiple sensors, the device also includes a data acquisition module, a data transmission module, a data processing module and a display module. In order to ensure the control effect, an alarm module is also provided. The above modules are electrically connected and arranged inside the multi-parameter integrated control unit cabinet 19, wherein the data acquisition module is responsible for collecting different parameters and transmitting them to the data processing module through the data transmission module, and can monitor and analyze the working state of the submersible electric pump system in real time according to the data collected by multiple sensors, and display the analysis results through the display module. According to the analysis results, the multi-parameter control unit will issue adjustment instructions to the main control cabinet to adjust the corresponding equipment to make its operation stable. If the adjustment is still ineffective after multiple times, the alarm module will issue an alarm.

[0062] These sensors and their acquisition parts, transmission parts, and analysis system software and hardware together constitute a multi-parameter detection system and analysis system. This device can also be used as a set of equipment for different submersible electric pump equipment.

[0063] Example 2

[0064] As the instruction manual Figure 1 It can be seen that when the submersible electric pump system is working, the submersible motor 1, motor protector 2, oil-gas separator 3, and submersible pump 4 are all placed in the oil wellbore 7, and there is oil well output fluid 8 in the wellbore. These four parts are coaxially arranged and driven by the submersible motor to rotate at high speed. The multi-section impeller structure in the submersible pump generates a lifting force due to the high-speed rotation, which lifts the oil well output fluid to the ground. The head of the submersible pump depends on the number of sections of the impeller and the guide casing, and the displacement mainly depends on its rotation speed. By controlling the working frequency of the submersible motor, the displacement of the submersible pump can be controlled.

[0065] In the present utility model, a total of 5 sensors are provided, namely, a capillary pressure sensor 13, a temperature sensor 16, a three-phase current sensor 15, a sensor for measuring the casing pressure of the oil well 17, and a mass flowmeter 18 for measuring the output of the submersible electric pump. The capillary pressure measurement system includes a nitrogen bottle 14, a capillary pressure sensor 13 and an actuator; a thermocouple temperature sensor 16 is installed near the motor, and the long thermocouple is connected to the ground and received by the measuring circuit; the three-phase current sensor 15 transmits the measurement data size and the fluctuation value of each phase to the receiving circuit; the casing pressure sensor 17 is installed in the wellbore, and the actuator on the wellhead transmits it to the receiving circuit; the pump displacement is measured by a tipping bucket output fluid metering device, and the output data is transmitted to the receiving circuit in a timely manner. All these signal receiving parts are installed in a multi-parameter integrated control unit cabinet 19 located on the ground, which includes multiple single-chip microcomputers and PLCs as lower computers and an industrial computer as a host computer. These sensors and their acquisition parts, transmission parts, and analysis system software and hardware together constitute a multi-parameter detection system and analysis system. This device can also be used as a set of equipment for different submersible electric pump equipment.

[0066] Application Example 1

[0067] A set of designed displacement of 15m in an oil field 3 / d, the submersible electric pump with a head of 2600m, the designed submersible motor power is 30kw, the submersible motor outer diameter is 114mm, and the submersible pump outer diameter is 98mm.

[0068] The system of Example 2 was installed on the equipment and operated in the well. At present, the equipment has been running continuously for 6 months and is in good working condition. According to the operation data records, during this 6-month period, the multi-parameter integrated control system issued a total of 27 frequency adjustment instructions, and the equipment quickly reached a new steady state and continued to work stably. It shows that the system proposed by the utility model is effective and can ensure the safe operation of the submersible electric pump equipment.

[0069] The above is only a preferred specific implementation manner of the present invention, but the protection scope of the present invention is not limited thereto. Any technician familiar with the technical field can make equivalent substitutions or changes within the technical scope disclosed in the present invention according to the technical scheme and inventive concept of the present invention, which should be covered by the protection scope of the present invention.

Claims

1. A system for comprehensive control of a submersible electric pump using multiple parameters, characterized in that: The system includes: A submersible electric pump downhole assembly, a control device and a sensor, wherein the sensor comprises: A capillary pressure sensor (13) is located in the wellbore (7) and is used to measure the pressure at the suction port of the submersible electric pump, and is combined with a nitrogen bottle (14) and an actuator to form a capillary pressure measurement system; A temperature sensor (16) is installed near the submersible motor (1) and is used to monitor the temperature of the submersible motor in real time; A three-phase current sensor (15) is connected to the submersible motor (1) and is used to measure the magnitude and fluctuation value of the three-phase current of the submersible motor (1); A casing pressure sensor (17), installed in the wellbore (7) and used to measure the casing pressure of the oil well; The mass flow meter (18) is connected to the outlet of the submersible electric pump and is used to measure the displacement of the submersible electric pump.

2. The system according to claim 1, characterized in that The downhole assembly comprises: A submersible motor (1), used to drive the system to work; A motor protector (2), which is connected to the submersible motor (1) and is used to protect the submersible motor (1) from abnormal operating conditions; An oil-gas separator (3) is arranged in the oil well shaft (7) and connected to the motor protector (2), and is used to separate gas and liquid in the oil well output fluid (8); A submersible pump (4) is connected to the oil-gas separator (3) and the oil pipe (9), has a multi-section impeller structure, and is driven by a submersible motor (1) to rotate at high speed to generate a lifting force to lift the oil well output fluid to the ground; The submersible motor (1), the motor protector (2), the oil-gas separator (3) and the submersible pump (4) are coaxially arranged in the wellbore (7) of the oil well, and the displacement of the submersible pump (4) can be adjusted and controlled by controlling the working frequency of the submersible motor (1).

3. The system according to claim 1, characterized in that The control device of the system comprises a main control cabinet (5) and a multi-parameter integrated control unit cabinet (19). The main control cabinet (5) is used to receive signals about the displacement, pressure or other relevant parameters of the submersible pump (4), and adjust the working frequency of the submersible motor (1) according to the received signals, so as to achieve precise control of the displacement of the submersible pump (4). The main control cabinet (5) can communicate with the submersible motor (1) in a wired or wireless manner to achieve remote monitoring and regulation.

4. The system according to claim 3, characterized in that In the control device, a multi-parameter integrated control unit cabinet (19) is installed on the ground and contains a plurality of single-chip microcomputers and a PLC as a lower computer, and an industrial computer as a higher computer, which is used to receive and process data collected by various sensors.

5. The system according to claim 3, characterized in that The system also includes a data acquisition module, a data transmission module, a data processing module and a display module. The modules are electrically connected and arranged inside a multi-parameter integrated control unit cabinet (19). The data processing module can monitor and analyze the working state of the submersible electric pump system in real time based on data collected by multiple sensors, and display the analysis results through the display module.

6. The system according to claim 3, characterized in that The multi-parameter integrated control unit cabinet (19) is connected to the main control cabinet (5) via a wired or wireless method, and the multi-parameter integrated control unit cabinet (19) sends a frequency modulation instruction to the main control cabinet to implement parameter adjustment.

7. The system according to claim 3, characterized in that All signal receiving parts are installed in the multi-parameter integrated control unit cabinet (19).

8. The system according to claim 1, characterized in that In the capillary pressure measuring system, a capillary pressure sensor (13) located in the wellbore (7) is connected to a nitrogen bottle (14) and is remotely transmitted to a receiving circuit by an actuator.

9. The system according to claim 1, characterized in that The temperature sensor (16) is a thermocouple sensor, which is installed near the motor winding, and its long thermocouple is connected to the ground and received by the measurement circuit.

10. The system according to claim 1, characterized in that The three-phase current sensor (15) transmits data to the receiving circuit; the casing pressure sensor (17) is installed in the wellbore (7) and is transmitted to the receiving circuit by the actuator on the wellhead; the mass flow meter (18) uses a tipping bucket type output fluid metering device to measure and transmits the production data to the receiving circuit in real time.

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