Intelligent control system of screw pump

Abstract

The invention discloses an intelligent control system for a screw pump, and relates to the technical field of mechanical oil extraction equipment. Comprising an injection system, a control system, an extraction system and an injection system. Compared with a traditional screw pump drainage and mining process, through intelligent control, remote monitoring and big data analysis, the operation and maintenance cost is greatly reduced, it can be guaranteed that the screw pump cannot be subjected to dry grinding, consequently, stator rubber of the pump cannot be damaged, the conditions of sand clamping and pipe column blocking of an oil and gas well cannot occur, the application range of the screw pump drainage and mining process is wide, and the service life of the screw pump is prolonged. For oil and gas wells within 3000m, the liquid production capacity can be maximum, the liquid level can be minimum, the automation degree is high, parameters are automatically adjusted, unattended operation is achieved, the Internet of Things technology is adopted, signal wireless transmission is achieved, operation parameters can be remotely adjusted, and operation can be remotely controlled.

Description

Technical Field

[0001] The invention relates to the technical field of mechanical oil production equipment, in particular to an intelligent control system for a screw pump. Background Art

[0002] As we all know, screw pumps are more effective in mining wells with high oil content or high viscosity. The viscosity of the mined crude oil can reach 50,000 MPa·s, and the sand content can reach 50%. At the same time, they are not very sensitive to gas and generally do not experience gas lock. Therefore, they are often used in the development of heavy oil, coalbed methane, and oil and gas wells with high sand content. However, screw pump development requires a certain submergence (usually 150m), otherwise, the screw pump will be damaged by dry grinding. For the mid-to-late development of coalbed methane and shale gas, the formation pressure is very low, and in most cases, a submergence of 150m cannot be guaranteed, resulting in frequent damage to the screw pump.

[0003] For example, the inclined well screw pump operation control method and device with patent publication number CN114962255A includes: collecting solid phase samples in the screw pump lowered into the inclined well; performing particle size and mineralogical analysis on the collected solid phase samples to determine the source of the solid phase in the screw pump; analyzing the production information of the screw pump to determine the cause of the solid phase in the screw pump, wherein each cause of solid phase corresponds to a screw pump operation control strategy that reduces the output of the solid phase in the screw pump; calling the corresponding screw pump operation control strategy according to the source and cause of the solid phase in the screw pump; and controlling the operation of the screw pump lowered into the inclined well according to the called screw pump operation control strategy. The present invention analyzes the source and cause of the solid phase in the inclined well screw pump and adopts the corresponding screw pump operation control strategy to reduce the output of the solid phase entering the screw pump from the inclined well, thereby extending the operating life of the screw pump. Although this method has a certain effect on oil and gas wells with low sand content, the sand particles in the formation are not discharged from the wellbore. If the time is a little longer or the amount of sand produced in the oil and gas well is large, the sand will bury the oil layer, resulting in a decrease in the production of the oil and gas well. Adjusting the operation control strategy of the screw pump can no longer achieve normal production, which eventually leads to dry wear and damage of the pump. Therefore, an intelligent control system for the screw pump is proposed. Summary of the invention

[0004] The purpose of the present invention is to provide an intelligent control system for a screw pump to solve the problems raised in the above background technology.

[0005] To achieve the above-mentioned purpose, the present invention provides the following technical solutions: an intelligent control system for a screw pump, comprising: an injection system, a control system, and a production system; The injection system is mainly responsible for injecting the required doping liquid (such as chemical liquid, cleaning liquid, etc.) into the screw pump at a set flow rate to ensure the normal operation of the pump and prevent malfunctions such as idling and overheating; The production system is responsible for extracting fluids from underground oil and gas reservoirs or other resources and transporting them to surface processing equipment; The control system ensures the coordination and efficient operation of the entire system by monitoring and adjusting the working status of each device.

[0006] As a specific solution in the technical solution of the present application, the injection system is composed of a booster pump, an injection liquid flow meter, an injection liquid solenoid valve, a torque tester, a hollow rod, a hollow rod straightener, a reverse check valve, a rotary sealer, etc.

[0007] As a specific solution in the technical solution of this application, the production system is composed of a sand screen, a screw pump, an anchoring device, an oil pipe, a hollow rod, a ground drive head, a separator, a produced liquid flow meter, a liquid storage tank, etc.

[0008] As a specific solution in the technical solution of the present application, the control system is composed of a frequency converter, a signal input, a signal analysis and processing software, a signal generator and a signal receiver.

[0009] As a specific solution in the technical solution of this application, the working steps of the injection system are as follows: S1: By starting the booster pump as the power source, a certain pressure is generated to push the injection liquid into the system; S2: When the injection liquid flows through the injection liquid flow meter, the injection liquid flow meter will accurately measure and record the flow rate of the injection liquid; S3: Then, the solenoid valve for the doped liquid controls the on and off of the injected liquid according to the command of the control system; S4: The torque tester continuously monitors the torque changes of the screw pump and promptly provides feedback on abnormal loads; S5: The hollow rod runs stably through the hollow rod centralizer to ensure smooth transmission; S6: Reverse check valve prevents liquid backflow and protects the system from pressure fluctuations; S7: The rotary sealer ensures the system is sealed to prevent leakage of injection fluid.

[0010] As a specific solution in the technical solution of this application, the working steps of the extraction system are as follows: P1: The produced fluid (oil, gas, water) from the well enters the production system through the sand screen to prevent solid particles such as sand from entering the system; P2: The screw pump transports the liquid from the well to the surface through the oil pipe, increasing the pressure of the liquid to ensure that the liquid can flow smoothly; P3: The surface drive head drives the screw pump through the hollow rod, which is responsible for transmitting power to the wellbore and also allows the liquid to flow along the hollow part; P4: Anchoring device fixes the hollow rod to ensure its stability during work and avoid excessive vibration or displacement; P5: The produced mixed liquid (crude oil, natural gas, water) is separated by a separator, which separates the three phases of liquid and transports them to different storage tanks; P6: The flow meter monitors the flow data of the produced fluid, feeds back to the control system in real time, and adjusts the system parameters to ensure stable flow output; P7: The separated crude oil, natural gas and water are stored in different tanks, awaiting subsequent processing, transportation or discharge.

[0011] As a specific solution in the technical solution of this application, the control system works as follows: M1: Collect system status data (such as flow, pressure, temperature, etc.) and transmit it to signal analysis and processing software; M2: Receives the signal transmitted by the signal input, analyzes it, and evaluates the working status of the screw pump; M3: Based on the analysis results, the signal generator is used to send a control signal to control the frequency converter to adjust the speed of the screw pump to meet the flow rate, pressure and other requirements; M4: Receive signals from other systems through signal receivers and adjust operating strategies in a timely manner to ensure that the screw pump and other related systems work together.

[0012] Compared with the prior art, the present invention has the following beneficial effects: Compared with the traditional screw pump production process, the intelligent control system of the screw pump greatly reduces the operation and maintenance costs through intelligent control, remote monitoring and big data analysis. It can ensure that the screw pump will not dry-grind, thereby damaging the stator rubber of the pump, and that oil and gas wells will not have sand jams or sand blocking the pipe column, making it adaptable to a wide range. For oil and gas wells within 3000m, it can maximize the liquid production and minimize the liquid level. It has a high degree of automation, automatic parameter adjustment, unmanned operation, and the use of Internet of Things technology and wireless signal transmission. It can remotely adjust operating parameters and remotely control operations. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] Figure 1 It is a schematic diagram of the drainage process of the present invention; Figure 2 It is a schematic diagram of the surface liquid level control unit of the present invention; Figure 3 It is a schematic diagram of the speed regulating part of a centrifugal pump or a plunger pump of the present invention; Figure 4 It is a schematic diagram of the torque analysis unit of the screw pump and the displacement adjustment of the booster pump of the present invention; Figure 5 It is a schematic diagram of the composition of the intelligent system of the present invention; Figure 6 It is a schematic diagram of the injection system; Figure 7 This is a schematic diagram of the extraction system; Figure 8 This is a schematic diagram of the control system.

[0014] In the figure: 1. Liquid storage tank; 2. Separator; 3. Rotary sealer; 4. Incorporation solenoid valve; 5. Torque detector; 6. Ground drive head; 7. Booster pump; 8. Frequency converter; 9. Casing; 10. Oil pipe; 11. Hollow rod; 12. Hollow rod straightener; 13. Reverse check valve; 14. Screw pump; 15. Anchoring device; 16. Check valve; 17. Sand control screen; 18. Incorporation flow meter; 19. Production liquid flow meter. DETAILED DESCRIPTION

[0015] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0016] like Figure 1-Figure 7 As shown, the present invention provides a technical solution: an intelligent control system for a screw pump, including an injection system, a production system, and a control system. The injection system is composed of an additional centrifugal pump or a plunger pump, an incorporated liquid flow meter, an incorporated liquid solenoid valve, a torque tester, a hollow rod, a hollow rod straightener, a reverse check valve, a rotary sealer, etc.; the production system is composed of a sand screen, a screw pump, an anchoring device, an oil pipe, a hollow rod, a ground drive head, a separator, a produced liquid flow meter, a storage tank, etc.; the control system is composed of a frequency converter, a signal input, a signal analysis and processing software, a signal generator, and a signal receiver, etc.

[0017] like Figure 1-7 As shown, in the embodiment of the present application, the frequency converter has two control systems: one group controls the speed of the booster pump, and the other group controls the speed of the ground drive head. The two groups do not interfere with each other and can ensure their independent operation. The injection liquid has two main functions: one is to ensure that the screw pump always works in the liquid and dry grinding does not occur, which leads to damage to the screw pump; the other is to prevent the liquid from settling due to failure to reach the critical flow rate and burying the pipe column with sand.

[0018] like Figure 1-7As shown, in the embodiment of the present application, the torque detector installed on the ground drive head detects the torque of the rod string in the whole well. When the torque increases to a certain value, it means that the gravel in the produced liquid is lower than the critical flow rate and settles in the hollow rod and the oil pipe. The booster pump displacement is increased by the frequency converter to make the added water or working fluid reach the critical flow rate, bring out the sand, and prevent the sand from blocking the screw pump; when the torque remains unchanged, it means that there is no or very little sand settling in the annulus of the oil pipe and the hollow rod, and the sand is produced to the ground with the sucked liquid. At this time, the booster pump speed is maintained, which is a normal working state; when the torque drops a lot, it means that the downhole rod string or screw pump has a fault, and it is necessary to reduce or stop the addition of water (or working fluid). At this time, an alarm prompts that the well has a fault and necessary measures need to be taken.

[0019] like Figure 1-7 As shown, in the embodiment of the present application, when the surface drive head increases the speed, and the produced liquid volume (the difference between the produced liquid flow meter and the injected liquid flow meter) cannot increase or decrease within a certain period of time, it means that the speed has reached the maximum value and needs to maintain the speed or reduce the speed. At this time, the liquid level is already near the pump port of the screw pump, ensuring that the liquid level is the lowest when the screw pump is pumping; on the contrary, when the surface drive head reduces the speed, and the produced liquid volume (the difference between the produced liquid flow meter and the injected liquid flow meter) decreases significantly within a certain period of time, it means that the speed has room to increase at this time, and the speed needs to be increased to ensure that the screw pump works near the liquid level. In this way, the screw pump can work in the optimal state and the production of oil and gas wells can be increased.

[0020] like Figure 1-7 As shown, in the embodiment of the present application, the workflow of the injection system is mainly to ensure that the required injection liquid (such as chemical liquid, cleaning liquid, etc.) can be injected into the screw pump or oil and gas collection system at a precise flow rate, to ensure the normal operation of the pump system, to prevent damage to the pump body, and to improve the efficiency and safety of the entire oil production or other application system. The following is the workflow of each component in the injection system: S1: When the system starts working, the centrifugal pump or plunger pump starts to provide the required injection liquid flow to the injection system. According to different needs, centrifugal pumps are usually suitable for scenarios with large flow and low pressure, while plunger pumps are suitable for scenarios with high pressure and low flow; the working speed and flow of the pump are adjusted by the frequency converter to ensure that the required injection liquid flow matches the pump's operating requirements.

[0021] S2: The doping liquid flow meter measures the flow of the injection liquid in real time and transmits the data to the control system. The control system will adjust the operating status of the pump according to the real-time data fed back by the flow meter to ensure that the flow of the injection liquid reaches the set value. If the liquid flow is too large or too small, the control system will automatically adjust the pump speed or open / close the doping liquid solenoid valve; S3: Under the command of the control system, the solenoid valve for doping liquid is responsible for accurately controlling the inflow and stop of the injection liquid. When the liquid volume needs to be adjusted, the opening or closing degree of the solenoid valve switch is accurately controlled by the control system to ensure accurate control of the liquid flow. If the flow of the injection liquid is too large during a period of time, the solenoid valve will close a part of the channel to reduce the flow. If the flow is insufficient, the solenoid valve will adjust the opening degree to maintain the stability of the injection liquid flow. S4: The torque tester transmits data to the control system, which dynamically adjusts the pump's operating parameters (such as speed, injection fluid flow, etc.) based on this information to avoid overload or system failure; S5: The hollow rod connects the injection system and the production system to transmit power or signals. The changes in the injection flow rate and the working status of the pump are also fed back to the control system through the hollow rod. Under high pressure or high load working conditions, the hollow rod may be subjected to large stretching or bending. Therefore, a hollow rod centralizer is required to ensure that it maintains vertical or linear movement during operation to prevent bending that may cause mechanical damage or poor liquid flow. S6: The hollow rod centralizer plays a supporting and stabilizing role during the movement of the hollow rod, ensuring that it always maintains a stable posture and avoids the displacement, bending or even breakage of the hollow rod due to excessive load. This not only protects the hollow rod itself, but also ensures the smooth flow of liquid and the stability of the equipment.

[0022] S7: During the flow of injection liquid, the reverse check valve is used to prevent liquid backflow, especially when the system is shut down or pressure fluctuations occur. The reverse check valve can ensure that the liquid flows in only one direction to prevent the liquid from flowing back into the pump or other equipment, thereby protecting the pump body from damage. The opening and closing of the reverse check valve is automatic. When the liquid flow direction changes, the valve will automatically close to prevent backflow; S8: When the injection liquid flows through the rotary sealer, the sealer prevents liquid leakage. The rotary sealer can withstand the rotation of the pump shaft and maintain good sealing to prevent liquid from leaking from the contact parts. The design of the rotary sealer ensures the normal operation of the pump shaft without affecting the flow of the liquid, ensuring the airtightness and safety of the injection system.

[0023] like Figure 1-7 As shown, in the embodiment of the present application, the workflow of the production system is to transport fluids such as crude oil, natural gas and water produced in underground oil wells to the ground through a series of equipment for separation and storage. The purpose of the whole process is to extract and transport oil, gas or other produced fluids while ensuring the safe and stable operation of underground and ground equipment. The following is the specific workflow of each component in the production system: P1: The sand screen is installed underground to filter sand and other solid particles at the bottom of the well to prevent these particles from entering the production system and damaging equipment such as screw pumps. During the oil production process, crude oil, natural gas and water from the well enter the production system through the sand screen to prevent sand from being brought into subsequent equipment. P2: Since the screw pump can work at a higher pressure, it can overcome the high viscosity and pressure of the downhole fluid and ensure the smooth rise and transportation of the produced fluid. The working state of the pump (such as speed, pressure, etc.) is adjusted by the ground control system to maintain a stable production flow rate; P3: The oil pipe transports the produced fluid from the well to the surface. The oil pipe is usually made of high-strength materials and can withstand the pressure from the well. The stability of the oil pipe is crucial to the entire production system and usually requires regular inspection to avoid leakage or damage. P4: The hollow rod transmits the power of the surface drive device to the screw pump underground. The hollow part inside the hollow rod can be used for the flow of liquid, and may also be used for the transmission of cables or optical fibers. The hollow rod needs to withstand greater pressure and temperature underground, so its strength and durability are required to be higher; P5: The anchoring device is usually installed at the wellhead. It fixes the hollow rod and prevents it from excessive displacement or vibration during operation. The anchoring device ensures the stability of the hollow rod, thereby ensuring the efficient operation of the screw pump. P6: The ground drive head is responsible for driving the screw pump through the hollow rod. The ground drive head is a device that connects the ground power source (such as an electric motor or internal combustion engine) with the hollow rod. It provides power to the screw pump by rotating the hollow rod. The speed, torque and other parameters of the ground drive head are usually adjusted by the control system according to the oil production requirements.

[0024] P7: The separator is used to separate the mixed liquids (such as crude oil, natural gas and water) extracted from the well. The separator separates them according to their different physical properties and transports them to different processing systems respectively; P8: The flow meter is installed in the produced fluid flow path to monitor the flow rate of the liquid flowing through the system in real time. The flow meter reading will be fed back to the ground control system, which will control the speed of the screw pump or adjust the valve and other equipment according to the actual flow data to maintain the stability of the flow rate. P9: The separated crude oil, natural gas and water are transported to different storage tanks. Storage tanks are used to store the produced crude oil, natural gas and water until subsequent processing, transportation or discharge. Storage tanks are usually equipped with pressure monitoring devices, anti-leakage facilities, etc. to ensure safety during storage.

[0025] like Figure 1-7As shown in the figure, the control system realizes intelligent control of the screw pump through the coordinated work of various components to ensure the efficient and stable operation of the pump, analyzes and processes the system status through real-time data of signal input and feedback, and adjusts the pump speed, controls the switch of the solenoid valve, and adjusts the flow rate and other parameters through the frequency converter. The control system automatically adjusts the working status of each component according to real-time data and preset operation logic to ensure the smooth and efficient operation of the entire injection system.

[0026] like Figure 2 As shown, in the embodiment of the present application, the ground liquid level control unit is mainly responsible for accurately monitoring and regulating the liquid level height in the ground liquid storage container (such as a storage tank, a pool, etc.) to ensure the smooth, safe and efficient operation of the entire system. The specific working steps of the ground liquid level control unit are as follows: H1: When the liquid level in the liquid storage tank is higher than a certain value, the SD1 electric valve is opened to discharge excess liquid, and the SD2 electric valve is closed to stop adding liquid from the outside; H2: When the liquid level in the liquid storage tank is within a certain range, open the SD2 electric valve to add liquid from the outside, close the SD1 electric valve, and stop discharging the liquid; H3: When the liquid level in the liquid storage tank is lower than a certain value, the controller will issue a water shortage alarm and the system will stop working.

[0027] It should be noted that SD1 and SD2 are electric valves, and the booster pump refers to a centrifugal pump or a plunger pump.

[0028] like Figure 3 As shown, in the embodiment of the present application, in oil production, the downhole formation pressure will change with the production process, and the plunger pump speed regulating unit can adjust the speed of the plunger pump according to the feedback information of the downhole pressure, so that the injection pressure of the doping liquid matches the downhole pressure. The specific working steps are as follows: Q1: When the flow rate of the mixed liquid is less than the flow rate of the produced liquid (this difference is the formation liquid production), increase the speed of the centrifugal pump or plunger pump at a certain interval (increase 1-10r / min). After increasing the speed, the formation liquid production increases. Increase the speed again. If the formation liquid production does not increase after increasing the speed, it means that the speed has reached the maximum value at this time, and maintain this speed; Q2: When the speed of the centrifugal pump or plunger pump is reduced at a certain interval (increased by 1-10r / min), the formation fluid production decreases after the speed is reduced. When the speed is reduced, the formation production is close to 0, indicating that the speed has reached the minimum value at this time; It should be noted that: FL1 and FL2 are the mixed liquid flow rate and the produced liquid flow rate respectively, the pump refers to a centrifugal pump or a plunger pump, c is the step size (such as c=5%, which can be set by the user), Rmax and Rmin are the maximum speed and minimum speed limit values ​​of the pump respectively. Through this method, the submergence of the screw pump can be guaranteed to be the lowest, avoiding the requirement that the screw pump needs a submergence of 150m.

[0029] like Figure 4 As shown, in the embodiment of the present application, when the screw pump is stuck due to sucking in too many impurities, the torque will increase sharply instantly. If the stator rubber ages and loses elasticity, resulting in a decrease in sealing performance, the torque will fluctuate and gradually increase. The torque analysis unit can detect these anomalies in time, which is conducive to early investigation and repair of problems, reducing the risk of equipment damage and maintenance costs; when the formation pressure changes dynamically with the mining process, the viscosity of crude oil is unstable due to the influence of temperature and composition, and the booster pump displacement adjustment can flexibly respond to these complex working conditions. When the formation pressure increases and the suction resistance of the screw pump increases, the displacement is increased in time to ensure that the mixed liquid is sufficiently injected into the well to maintain the normal suction and discharge of the screw pump. When the viscosity of crude oil increases, the displacement is appropriately increased to help better mix and dilute the crude oil, reduce flow resistance, and ensure smooth oil production operations. The specific working steps are as follows: T1: When the torque is higher than the rated torque, it means that there is sand in the screw pump pipe string, which increases the friction of the rod string and the torque. The booster pump needs to increase the speed and increase the displacement of the mixed working fluid. If the torque does not increase, it means that the displacement is appropriate at this time. T2: The controller records torque data every 5 seconds. If the last 5 torque data are all lower than the average of the last 6 to 10 torque data by a certain percentage (the specific percentage needs to be determined based on the inclination, viscosity and other data of the oil and gas well), it is determined that the screw pump rod string has a fault, an alarm is sounded, and the machine is shut down for operation.

[0030] It should be noted that: Ni and Na are the current measured torque and target torque respectively, the drive head refers to the screw pump drive motor, c is the step size (for example: c=5%, which can be set by the user), △Nf is the difference between the current torque Ni and the last measured torque Ni-1, which can be set by the user, Rmax and Rmin are the maximum and minimum speed limit values ​​of the pump, which can be set by the user.

[0031] Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is limited by the attached embodiments and their equivalents.

Claims

1. A screw pump intelligent control system, characterized in that: include: Injection system, control system, and production system; The injection system is mainly responsible for injecting the required doping liquid (such as chemical liquid, cleaning liquid, etc.) into the screw pump at a set flow rate to ensure the normal operation of the pump and prevent malfunctions such as idling and overheating; The production system is responsible for extracting fluids from underground oil and gas reservoirs or other resources and transporting them to surface processing equipment; The control system ensures the coordination and efficient operation of the entire system by monitoring and adjusting the working status of each device.

2. The intelligent control system for a screw pump according to claim 1, characterized in that: The injection system is composed of a booster pump, an injection liquid flow meter, an injection liquid electromagnetic valve, a torque tester, a hollow rod, a hollow rod centralizer, a reverse check valve, a rotary sealer, etc.

3. The intelligent control system for a screw pump according to claim 1, characterized in that: The production system consists of a sand control screen, a screw pump, an anchoring device, an oil pipe, a hollow rod, a surface drive head, a separator, a produced liquid flow meter, a liquid storage tank, etc.

4. The intelligent control system for a screw pump according to claim 1, characterized in that: The control system is composed of a frequency converter, a signal input, a signal analysis and processing software, a signal generator and a signal receiver.

5. The intelligent control system for a screw pump according to claim 2, characterized in that: The injection system works as follows: S1: By starting the booster pump as a power source, a certain pressure is generated to push the injection liquid into the system; S2: When the injection liquid flows through the injection liquid flow meter, the injection liquid flow meter will accurately measure and record the flow rate of the injection liquid; S3: Then, the solenoid valve for the doped liquid controls the on and off of the injected liquid according to the command of the control system; S4: The torque tester continuously monitors the torque changes of the screw pump and promptly provides feedback on abnormal loads; S5: The hollow rod runs stably through the hollow rod centralizer to ensure smooth transmission; S6: Reverse check valve prevents liquid backflow and protects the system from pressure fluctuations; S7: The rotary sealer ensures the system is sealed to prevent leakage of injection fluid.

6. The intelligent control system for a screw pump according to claim 3 is characterized in that: The working steps of the extraction system are as follows: P1: The produced fluid (oil, gas, water) from the well enters the production system through the sand screen to prevent solid particles such as sand from entering the system; P2: The screw pump transports the liquid from the well to the surface through the oil pipe, increasing the pressure of the liquid to ensure that the liquid can flow smoothly; P3: The surface drive head drives the screw pump through the hollow rod, which is responsible for transmitting power to the wellbore and also allows the liquid to flow along the hollow part; P4: Anchoring device fixes the hollow rod to ensure its stability during work and avoid excessive vibration or displacement; P5: The produced mixed liquid (crude oil, natural gas, water) is separated by a separator, which separates the three phases of liquid and transports them to different storage tanks; P6: The flow meter monitors the flow data of the produced fluid, feeds back to the control system in real time, and adjusts the system parameters to ensure stable flow output; P7: The separated crude oil, natural gas and water are stored in different tanks, awaiting subsequent processing, transportation or discharge.

7. The intelligent control system for a screw pump according to claim 4, characterized in that: The control system works as follows: M1: Collect system status data (such as flow, pressure, temperature, etc.) and transmit it to signal analysis and processing software; M2: Receives the signal transmitted by the signal input, analyzes it, and evaluates the working status of the screw pump; M3: Based on the analysis results, the signal generator is used to send a control signal to control the frequency converter to adjust the speed of the screw pump to meet the flow rate, pressure and other requirements; M4: Receive signals from other systems through signal receivers and adjust operating strategies in a timely manner to ensure that the screw pump and other related systems work together.

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