Small-displacement electric submersible pump control system, method and device, medium and electronic equipment

Abstract

The invention discloses a small-displacement electric submersible pump control system, method and device, a medium and electronic equipment. The method comprises the steps that the real-time liquid level in a shaft is obtained through liquid level detection and control equipment, if the real-time liquid level reaches or is lower than a warning liquid level, an electric submersible pump control cabinet is controlled to generate a speed reduction instruction, the power supply frequency of a frequency converter in the electric submersible pump control cabinet is reduced, and therefore the rotating speed of a submersible motor is reduced; and if the rotating speed reaches the lowest rotating speed and the real-time liquid level reaches or is lower than the safety limit liquid level, a liquid supplementing working mode is started through the electric submersible pump control cabinet, a liquid supplementing pump is controlled to supplement output liquid in the shaft, and therefore the real-time liquid level in the shaft is increased and controlled to reach a stable state, and the output liquid in the shaft is supplemented. The stable state represents that the real-time liquid level reaches or is lower than the normal liquid level, and the change amplitude of the real-time liquid level is smaller than the preset amplitude along with operation of the submersible motor. According to the invention, stable control of the real-time liquid level in the shaft can be realized.

Description

Background Art

[0002] At present, in the development process of some oil wells with low production and large depth, the unstable discharge of small-production oil wells easily causes the instability of the oil well liquid level and damage to the oil well production equipment. Therefore, in order to solve the above problems, the present application provides a small-displacement submersible electric pump control method. Summary of the invention

[0003] The purpose of the present application is to provide a control system, method, device, medium and electronic equipment for a small displacement submersible electric pump. The method can achieve stable control of the real-time liquid level in the wellbore.

[0004] Other features and advantages of the present application will become apparent from the following detailed description, or may be learned in part by the practice of the present application.

[0005] According to one aspect of an embodiment of the present application, a small-displacement submersible electric pump control method is provided, the method comprising: obtaining a real-time liquid level in a wellbore through a liquid level detection and control device; if the real-time liquid level reaches or is lower than a warning liquid level, controlling a submersible electric pump control cabinet to generate a speed reduction instruction through the liquid level detection and control device, and reducing the power supply frequency of a frequency converter in the submersible electric pump control cabinet based on the speed reduction instruction, thereby reducing the speed of the submersible motor; if the speed reaches a minimum speed and the real-time liquid level reaches or is lower than a safety limit liquid level, starting a fluid replenishment working mode through the submersible electric pump control cabinet, controlling a fluid replenishment pump to replenish produced fluid in the wellbore, thereby increasing the real-time liquid level in the wellbore, and controlling the real-time liquid level in the wellbore to reach a stable state, wherein the stable state is characterized by the real-time liquid level reaching or being lower than a normal liquid level, and as the submersible motor runs, the change amplitude of the real-time liquid level is less than a preset amplitude.

[0006] In one embodiment of the present application, based on the aforementioned scheme, after reducing the rotation speed of the submersible motor, the method further includes: obtaining the real-time liquid level in the wellbore, and if the real-time liquid level reaches a stable state, operating the submersible motor based on the current rotation speed.

[0007] In one embodiment of the present application, based on the aforementioned scheme, the method also includes: if the real-time liquid level in the wellbore exceeds the normal liquid level, the submersible electric pump control cabinet is controlled to generate a speed-up instruction through the liquid level detection and control equipment, and the power supply frequency of the inverter in the submersible electric pump control cabinet is increased based on the speed-up instruction, thereby increasing the speed of the submersible motor, and controlling the real-time liquid level in the wellbore to reach a stable state.

[0008] In one embodiment of the present application, based on the above-mentioned solution, when the wellbore output fluid is heavy oil, the method further includes: controlling the fluid replenishment pump to replenish hot water in the wellbore to reduce the viscosity of the wellbore output fluid.

[0009] In one embodiment of the present application, based on the aforementioned scheme, the method further includes: obtaining the temperature corresponding to the submersible motor through a temperature sensor, and if the temperature is greater than a preset temperature, controlling the fluid replenishment pump to inject cold water into the submersible motor accessories to reduce the temperature of the submersible motor.

[0010] In one embodiment of the present application, based on the above solution, the preset temperature is 150°C.

[0011] According to one aspect of an embodiment of the present application, a small-displacement submersible electric pump control system is provided, the system comprising: a liquid level detection and control device, a submersible electric pump control cabinet, a submersible motor, and a fluid replenishment pump; the liquid level detection and control device is remotely connected to the submersible electric pump control cabinet and is wired to the fluid replenishment pump, the liquid level detection and control device is used to control the power supply frequency of the frequency converter in the submersible electric pump control cabinet, control the working mode of the submersible electric pump control cabinet, and control the fluid replenishment pump to perform fluid replenishment operation on the wellbore; the submersible electric pump control cabinet is remotely connected to the liquid level detection and control device, the submersible electric pump control cabinet is used to adjust the speed of the submersible motor by changing the power supply frequency of the frequency converter; the submersible motor is arranged at the lower end of the oil pipe and is arranged between the motor protector and the motor internal cooling pipe group, the submersible motor is used to extract the output fluid in the wellbore in combination with the submersible pump; the fluid replenishment pump is wired to the liquid level detection and control device, and the fluid replenishment pump is used to replenish the output fluid in the output fluid balance tank into the wellbore.

[0012] According to one aspect of an embodiment of the present application, a small-displacement submersible electric pump control device is provided, the device comprising: a first control unit, for obtaining a real-time liquid level in a wellbore through a liquid level detection and control device, and if the real-time liquid level reaches or is lower than a warning liquid level, controlling a submersible electric pump control cabinet to generate a speed reduction instruction through the liquid level detection and control device, and reducing the power supply frequency of the inverter in the submersible electric pump control cabinet based on the speed reduction instruction, thereby reducing the speed of the submersible motor; a second control unit, for, if the speed reaches a minimum speed and the real-time liquid level reaches or is lower than a safety limit liquid level, starting a fluid replenishment working mode through the submersible electric pump control cabinet, controlling a fluid replenishment pump to replenish produced fluid in the wellbore, thereby increasing the real-time liquid level in the wellbore, and controlling the real-time liquid level in the wellbore to reach a stable state, wherein the stable state is characterized by the real-time liquid level reaching or being lower than a normal liquid level, and as the submersible motor runs, the change amplitude of the real-time liquid level is less than a preset amplitude.

[0013] According to one aspect of an embodiment of the present application, a computer-readable storage medium is provided, on which a computer program is stored. The computer program includes executable instructions. When the executable instructions are executed by a processor, the method described in the above embodiment is implemented.

[0014] According to one aspect of an embodiment of the present application, an electronic device is provided, comprising: one or more processors; and a memory for storing executable instructions of the processors, wherein when the executable instructions are executed by the one or more processors, the one or more processors implement the methods described in the above embodiments.

[0015] In the technical solution of the embodiment of the present application, the real-time liquid level in the wellbore is judged by the liquid level detection and control equipment, and the submersible electric pump control cabinet is controlled to generate control instructions. If the real-time liquid level reaches or is lower than the warning liquid level, the power supply frequency of the frequency converter in the submersible electric pump control cabinet is reduced, thereby reducing the speed of the submersible motor. If the real-time liquid level reaches or is lower than the safety limit liquid level, and the speed reaches the minimum speed, the replenishment pump is controlled to replenish the production fluid in the wellbore, thereby increasing the real-time liquid level in the wellbore and making the real-time liquid level in the wellbore reach a stable state. Therefore, through the above-mentioned control method, stable control of the real-time liquid level in the wellbore can be achieved.

[0016] It should be understood that the foregoing general description and the following detailed description are exemplary and explanatory only and are not restrictive of the present application. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] The drawings herein are incorporated into the specification and constitute a part of the specification, showing embodiments consistent with the present application, and together with the specification, are used to explain the principles of the present application. Obviously, the drawings described below are only some embodiments of the present application, and for ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work. In the drawings:

[0018] Figure 1 It is a schematic diagram of a small-displacement submersible electric pump control system according to an embodiment of the present application;

[0019] Figure 2 It is a flow chart of a small displacement submersible electric pump control method according to an embodiment of the present application;

[0020] Figure 3 is a schematic diagram of a combined cable according to an embodiment of the present application;

[0021] Figure 4 It is a block diagram of a small displacement submersible electric pump control device according to an embodiment of the present application;

[0022] Figure 5 It is a schematic diagram of the system structure of an electronic device according to an embodiment of the present application. DETAILED DESCRIPTION

[0023] Example embodiments will now be described more fully with reference to the accompanying drawings. However, example embodiments can be implemented in a variety of forms and should not be construed as limited to the examples set forth herein; rather, these embodiments are provided so that this application will be more comprehensive and complete and fully convey the concept of the example embodiments to those skilled in the art.

[0024] In addition, described feature, structure or characteristic can be combined in one or more embodiments in any suitable manner. In the following description, many specific details are provided to provide a full understanding of the embodiments of the present application. However, those skilled in the art will appreciate that the technical scheme of the present application can be put into practice without one or more of the specific details, or other methods, components, devices, steps, etc. can be adopted. In other cases, known methods, devices, realizations or operations are not shown or described in detail to avoid blurring the various aspects of the application.

[0025] The block diagrams shown in the accompanying drawings are merely functional entities and do not necessarily correspond to physically independent entities. That is, these functional entities may be implemented in software form, or in one or more hardware modules or integrated circuits, or in different networks and / or processor devices and / or microcontroller devices.

[0026] The flowcharts shown in the accompanying drawings are only exemplary and do not necessarily include all the contents and operations / steps, nor must they be executed in the order described. For example, some operations / steps can be decomposed, and some operations / steps can be combined or partially combined, so the actual execution order may change according to actual conditions.

[0027] It should be noted that the "multiple" mentioned in this article refers to two or more. "And / or" describes the association relationship of the associated objects, indicating that there can be three relationships. For example, A and / or B can mean: A exists alone, A and B exist at the same time, and B exists alone. The character " / " generally indicates that the associated objects before and after are in an "or" relationship.

[0028] Reference Figure 1 , is a schematic diagram of a small-displacement submersible electric pump control system according to an embodiment of the present application. Figure 1The control system of the small-displacement submersible electric pump includes: a submersible motor 1, a motor protector 2, an oil-gas separator 3, a submersible pump 4, a wellhead sealing device 5, a submersible electric pump control cabinet 6, a transformer 7, a submersible cable 8, an oil pipe 9, a wellbore 10, an oil well output fluid 11, a normal liquid level 12, a pressure measuring capillary 13, a nitrogen bottle 14, a liquid level detection and control device 15, a liquid replenishment pump wired control 15-1, a frequency converter remote control 15-2, a liquid replenishment pump 16, a liquid replenishment capillary 17, a production liquid balance tank 18, a balance tank liquid replenishment pipeline 19, a chemical tank 20, a water tank 21, a motor internal cooling pipe group 22, a chemical tank and a water tank liquid replenishment pipeline 23, a warning liquid level 24, a safety limit liquid level 25, and a packer 26.

[0029] During the operation of the small-displacement submersible electric pump control system, the submersible motor 1, the motor protector 2, the oil-gas separator 3 and the submersible pump 4 perform the operation of extracting the output fluid from the wellbore, and store the output fluid in the oil tank through the oil pipe 9. In the process of extracting the output fluid from the wellbore 10, the liquid level detection and control device 15 detects the liquid level of the output fluid from the wellbore 10 in real time. When the liquid level of the output fluid from the wellbore 10 is lower than the warning liquid level 24, the liquid level detection and control device 15 first sends a speed reduction command to the submersible electric pump control cabinet 6 through the inverter remote control 15-2, reducing the power supply frequency of the inverter in the submersible electric pump control cabinet 6, thereby reducing the speed of the submersible motor 1.

[0030] As the speed of the submersible motor 1 decreases, the displacement of the submersible pump 4 also decreases synchronously. If the real-time liquid level in the wellbore 10 no longer decreases or increases, it means that reducing the speed of the submersible motor 1 can bring beneficial effects, so the small displacement submersible electric pump control system can be operated at the current speed.

[0031] If the real-time liquid level in the wellbore 10 still drops after the speed of the submersible motor 1 is reduced, it means that the current speed of the submersible motor 1 is still too fast. Therefore, the speed of the submersible motor 1 can be further reduced so that the real-time liquid level in the wellbore 10 no longer drops or increases.

[0032] It should be noted that the speed of the submersible motor 1 has an adjustable range. If the current speed of the submersible motor 1 is at the lowest speed and the real-time liquid level in the wellbore 10 is still decreasing, it means that abnormal drainage occurs in the wellbore 10. When the real-time liquid level in the wellbore 10 reaches or is lower than the safety limit liquid level 25, the liquid level detection and control device 15 controls the liquid replenishment pump 16 to start, and the output liquid stored in the output liquid balance tank 18 is replenished into the wellbore 10 through the liquid replenishment capillary 17 to increase the current real-time liquid level in the wellbore 10.

[0033] At this time, the submersible motor 1, the submersible pump 4 and the replenishing pump 16 are working at the same time, wherein the function of the replenishing pump 16 is to replenish the liquid level for the wellbore 10, to ensure that the submersible motor 1 does not run idle and to ensure that the submersible pump 4 does not stop, until the downhole drainage returns to normal. When the downhole drainage returns to normal, the real-time liquid level of the wellbore 10 will rise. When the real-time liquid level returns to above the warning liquid level, the replenishing pump 16 can stop replenishing the liquid. If the real-time liquid level of the wellbore 10 continues to rise after the replenishing pump 16 stops replenishing the liquid, and when the real-time liquid level of the wellbore 10 reaches the normal liquid level 12, the liquid level detection and control device 15 sends an instruction to increase the power supply frequency to the frequency converter in the submersible electric pump control cabinet 6, and gradually increases the speed of the submersible motor 1 until the real-time liquid level of the wellbore 10 returns to a stable state.

[0034] Therefore, by implementing the above-mentioned small-displacement submersible electric pump control system, it is possible to ensure that the real-time liquid level in the wellbore is in a stable state, thereby ensuring the safety of the submersible motor and submersible pump equipment.

[0035] The implementation details of the technical solution of the embodiment of the present application are described in detail below:

[0036] According to one aspect of the present application, a small displacement submersible electric pump control method is provided. Figure 2 The flowchart of the small displacement submersible electric pump control method according to the embodiment of the present application is shown. The small displacement submersible electric pump control method can be executed by a device with a computing and processing function. The small displacement submersible electric pump control method includes at least steps 210 to 220, which are described in detail as follows:

[0037] In step 210, the real-time liquid level in the wellbore is obtained through the liquid level detection and control equipment. If the real-time liquid level reaches or is lower than the warning liquid level, the submersible electric pump control cabinet is controlled by the liquid level detection and control equipment to generate a speed reduction instruction, and the power supply frequency of the inverter in the submersible electric pump control cabinet is reduced based on the speed reduction instruction, thereby reducing the speed of the submersible motor.

[0038] In the present application, in some oil wells with low production and great depth, the submersible electric pumps are in extremely harsh working conditions, which may easily lead to equipment damage.

[0039] For example, due to the unstable drainage of small-volume oil wells, the drainage capacity of the oil wells is sometimes lower than the displacement of the submersible electric pump for a period of time, causing the real-time liquid level in the wellbore to drop continuously, and finally causing the oil well to be drained. At this time, the submersible motor is still rotating at high speed, and the idling of the submersible motor causes severe friction of the components, a sharp increase in temperature, and no cooling of the flowing well fluid, which will cause the submersible motor to have excessive current and overheat, causing the motor insulation to be broken down and damaged. Sometimes, due to overheating and locking of the thrust bearing in the protector, wear and damage of the submersible pump pad, etc., the load of the submersible motor increases instantly, which can also cause overcurrent damage to the submersible motor.

[0040] For example, due to the long-term under-flow operation of the submersible motor, the liquid is not fully distributed on the blades of the submersible motor. In addition, since there are many metal ions such as calcium and magnesium in the well fluid, when the flow is discontinuous, it is easy to cause scaling of the internal components of the submersible motor. When the submersible motor blades rotate, the resistance gradually increases, causing the submersible motor to overload and gradually cause damage.

[0041] Therefore, in order to solve the damage of equipment in the submersible electric pump system caused by the above-mentioned harsh working conditions, the present application first obtains the real-time liquid level in the wellbore through the liquid level detection and control equipment. Then, based on the real-time liquid level in the wellbore, the speed of the submersible motor is controlled by judging the real-time liquid level in the wellbore.

[0042] If the real-time liquid level reaches or is lower than the warning liquid level, the liquid level detection and control equipment will be used to control the submersible pump control cabinet to generate a speed reduction command, and based on the speed reduction command, the power supply frequency of the frequency converter in the submersible pump control cabinet will be reduced, thereby reducing the speed of the submersible motor. Due to the decrease in the speed of the submersible motor, the displacement of the submersible pump will also decrease synchronously. Therefore, by reducing the speed of the submersible motor, the overall displacement of the small-displacement submersible motor control system can be reduced, thereby reducing the downward trend of the real-time liquid level in the wellbore, or increasing the real-time liquid level in the wellbore.

[0043] Furthermore, after reducing the rotation speed of the submersible motor, the real-time liquid level in the wellbore can be obtained. If the real-time liquid level reaches a stable state, the submersible motor can be operated based on the current rotation speed, so that the small-displacement submersible electric pump control system will not shut down, avoiding overload damage caused by frequent shutdown and restart of the small-displacement submersible electric pump control system, and protecting the small-displacement submersible electric pump control system from damage to the equipment due to dry pumping.

[0044] Continue to refer to Figure 2In step 220, if the rotational speed reaches the minimum rotational speed and the real-time liquid level reaches or is lower than the safety limit liquid level, the fluid replenishment working mode is turned on by the submersible electric pump control cabinet, and the fluid replenishment pump is controlled to replenish the produced fluid in the wellbore, thereby increasing the real-time liquid level in the wellbore, and controlling the real-time liquid level in the wellbore to reach a stable state. The stable state is characterized by that the real-time liquid level reaches or is lower than the normal liquid level, and as the submersible motor runs, the change amplitude of the real-time liquid level is less than the preset amplitude.

[0045] In this application, when the real-time liquid level of the wellbore reaches or is lower than the warning liquid level, and the speed of the submersible motor has reached the minimum speed, the real-time liquid level of the wellbore cannot be increased by simply reducing the speed of the submersible motor. Therefore, the submersible electric pump control cabinet can be used to start the liquid replenishment working mode, control the liquid replenishment pump to replenish the output fluid in the wellbore, thereby increasing the real-time liquid level in the wellbore and controlling the real-time liquid level in the wellbore to reach a stable state.

[0046] Among them, through the wired control between the liquid level detection and control equipment and the liquid replenishment pump, the liquid replenishment pump is controlled to extract the output fluid from the output fluid balance tank and replenish it into the wellbore. Since the submersible motor, submersible pump and liquid replenishment pump are running at the same time, it is possible to adjust the real-time liquid level of the wellbore without stopping the submersible motor and the submersible pump. When the real-time liquid level returns to above the warning liquid level, the liquid replenishment pump can stop replenishing liquid.

[0047] Furthermore, in one embodiment of the present application, if the real-time liquid level in the wellbore is still not in a stable state after the replenishment pump stops replenishing fluid, the real-time liquid level in the wellbore can be controlled by the following steps: If the real-time liquid level in the wellbore exceeds the normal liquid level, the submersible electric pump control cabinet is controlled to generate a speed-up instruction through the liquid level detection and control equipment, and the power supply frequency of the frequency converter in the submersible electric pump control cabinet is increased based on the speed-up instruction, thereby increasing the speed and displacement of the submersible motor, and controlling the real-time liquid level in the wellbore to reach a stable state.

[0048] That is, due to the replenishment of the produced fluid, and combined with the displacement of the submersible pump at the current speed of the submersible motor, the real-time liquid level in the wellbore will gradually increase, and even make the real-time liquid level exceed the normal liquid level. Therefore, in order to control the real-time liquid level to be at the normal liquid level or below the normal liquid level, the submersible electric pump control cabinet can be controlled by the liquid level detection and control equipment to generate a speed-up instruction, and the power supply frequency of the frequency converter in the submersible electric pump control cabinet can be increased based on the speed-up instruction, thereby increasing the speed of the submersible motor, and then controlling the real-time liquid level in the wellbore to reach a stable state. At this time, the drainage of the oil well has completely returned to normal.

[0049] It should be noted that when the wellbore output fluid is thick oil, due to the high viscosity and difficulty in transportation, the submersible pump will be overloaded and the submersible motor will be damaged by overcurrent. At this time, the refill pump can be controlled to add hot water to the wellbore to reduce the viscosity of the output fluid in the wellbore. After the refill pump adds hot water to the wellbore and reduces the viscosity of the output fluid in the wellbore, it can ensure that the submersible pump can smoothly lift the output fluid to the surface.

[0050] Furthermore, during the operation of the submersible motor, in order to ensure the safety and long-term operation of the equipment, the temperature corresponding to the submersible motor can be obtained through a temperature sensor, and if the temperature is greater than a preset temperature, the liquid replenishing pump is controlled to inject cold water into the submersible motor accessories to reduce the temperature of the submersible motor. The preset temperature can be 150°C.

[0051] In addition, it should be added that Figure 3 , Figure 3 It is a schematic diagram of a combined cable according to an embodiment of the present application. Figure 3 The combined cable includes submersible motor power supply conductors 27 / 28 / 29, cable insulation 30, cable lead armor protection layer 31, pressure measuring capillary 32, fluid replenishment capillary 33, capillary protection 34, combined cable steel 35 and wrapping protection material 36.

[0052] Due to the needs of downhole oil production technology, packers are usually installed in oil wells. In order to avoid the difficulties caused by the power supply wires, pressure measuring capillaries and fluid replenishment capillaries in the control system of small-displacement submersible electric pumps passing through the packers, they need to be sealed and fixed along several thousand meters of oil pipes, and to ensure that the pressure measuring capillaries and fluid replenishment capillaries will not be damaged or broken by the wellbore during downhole operations, the power supply wires, pressure measuring capillaries and fluid replenishment capillaries can be arranged in the same combined cable. Among them, the outside of the three power supply cables is wrapped with a rubber or plastic insulation layer and a lead armor protective layer like the normal submersible electric pump cables, and the outside of the two capillaries is wrapped with a protective layer wrapped with protective materials. Then, after being bundled and shaped with wrapping protective materials (such as high-temperature resistant plastic wrapping tape, glass fiber cloth, etc.), stainless steel or carbon steel armor is prepared on the outermost of the bundling layer. In this way, it is easier to achieve underground crossing, fixation and cable protection.

[0053] In summary, in the technical solution of the embodiment of the present application, the real-time liquid level in the wellbore is judged by the liquid level detection and control equipment, and the submersible electric pump control cabinet is controlled to generate control instructions. If the real-time liquid level reaches or is lower than the warning liquid level, the power supply frequency of the frequency converter in the submersible electric pump control cabinet is reduced, thereby reducing the speed of the submersible motor. If the real-time liquid level reaches or is lower than the safety limit liquid level, and the speed reaches the minimum speed, the replenishment pump is controlled to replenish the produced fluid in the wellbore, thereby increasing the real-time liquid level in the wellbore and making the real-time liquid level in the wellbore reach a stable state. Therefore, through the above-mentioned control method, stable control of the real-time liquid level in the wellbore can be achieved.

[0054] The following describes an embodiment of the device of the present application, which can be used to execute the vehicle gap and flushness data processing method in the above embodiment of the present application. For details not disclosed in the embodiment of the device of the present application, please refer to the embodiment of the vehicle gap and flushness data processing method in the above embodiment of the present application.

[0055] Figure 4 It is a block diagram of a small-displacement submersible electric pump control device according to an embodiment of the present application.

[0056] Reference Figure 4 As shown, according to an embodiment of the present application, a small-displacement submersible electric pump control device 400, the device 400 includes: a first control unit 401, used to obtain the real-time liquid level in the wellbore through a liquid level detection and control device, if the real-time liquid level reaches or is lower than the warning liquid level, the submersible electric pump control cabinet is controlled to generate a speed reduction instruction through the liquid level detection and control device, and the power supply frequency of the inverter in the submersible electric pump control cabinet is reduced based on the speed reduction instruction, thereby reducing the speed of the submersible motor; a second control unit 402, used to start the fluid replenishment working mode through the submersible electric pump control cabinet if the speed reaches the minimum speed and the real-time liquid level reaches or is lower than the safety limit liquid level, control the fluid replenishment pump to replenish the produced fluid in the wellbore, thereby increasing the real-time liquid level in the wellbore, and controlling the real-time liquid level in the wellbore to reach a stable state, the stable state is characterized by the real-time liquid level reaching or lower than the normal liquid level, and with the operation of the submersible motor, the change amplitude of the real-time liquid level is less than the preset amplitude.

[0057] As another aspect, the present application further provides a computer-readable storage medium on which a program product capable of implementing the above method of the present specification is stored. In some possible implementations, various aspects of the present application may also be implemented in the form of a program product, which includes a program code, and when the program product is run on a terminal device, the program code is used to enable the terminal device to execute the steps according to various exemplary implementations of the present application described in the above "Exemplary Method" section of the present specification.

[0058] Computer readable signal media may include data signals propagated in baseband or as part of a carrier wave, in which readable program code is carried. Such propagated data signals may take a variety of forms, including but not limited to electromagnetic signals, optical signals, or any suitable combination of the above. Readable signal media may also be any readable medium other than a readable storage medium, which may send, propagate, or transmit a program for use by or in conjunction with an instruction execution system, apparatus, or device.

[0059] The program code embodied on the readable medium may be transmitted using any appropriate medium, including but not limited to wireless, wired, optical cable, RF, etc., or any suitable combination of the foregoing.

[0060] Program code for performing the operations of the present application may be written in any combination of one or more programming languages, including object-oriented programming languages ​​such as Java, C++, etc., and conventional procedural programming languages ​​such as "C" or similar programming languages. The program code may be executed entirely on the user computing device, partially on the user device, as a separate software package, partially on the user computing device and partially on a remote computing device, or entirely on a remote computing device or server. In the case of a remote computing device, the remote computing device may be connected to the user computing device through any type of network, including a local area network (LAN) or a wide area network (WAN), or may be connected to an external computing device (e.g., using an Internet service provider to connect through the Internet).

[0061] As another aspect, the present application also provides an electronic device capable of implementing the above method.

[0062] Those skilled in the art will appreciate that various aspects of the present application may be implemented as a system, method or program product. Therefore, various aspects of the present application may be specifically implemented in the following forms, namely: a complete hardware implementation, a complete software implementation (including firmware, microcode, etc.), or a combination of hardware and software, which may be collectively referred to as "circuit", "module" or "system" herein.

[0063] Figure 5 The schematic diagram of the system structure of the electronic device according to the embodiment of the present application is shown below. Figure 5 The electronic device 500 according to this embodiment of the present application is described. Figure 5 The electronic device 500 shown is merely an example and should not bring any limitation to the functions and scope of use of the embodiments of the present application.

[0064] like Figure 5As shown, the electronic device 500 is in the form of a general computing device. The components of the electronic device 500 may include but are not limited to: at least one processing unit 510, at least one storage unit 520, and a bus 530 connecting different system components (including the storage unit 520 and the processing unit 510).

[0065] The storage unit stores program codes, which can be executed by the processing unit 510, so that the processing unit 510 executes the steps described in the above “Example Method” section of this specification according to various exemplary implementations of the present application.

[0066] The storage unit 520 may include a readable medium in the form of a volatile storage unit, such as a random access memory unit (RAM) 521 and / or a cache memory unit 522 , and may further include a read-only memory unit (ROM) 523 .

[0067] The storage unit 520 may also include a program / utility 524 having a set (at least one) of program modules 525, such program modules 525 including but not limited to: an operating system, one or more application programs, other program modules, and program data, each of which or some combination may include an implementation of a network environment.

[0068] Bus 530 may represent one or more of several types of bus structures, including a memory unit bus or memory unit controller, a peripheral bus, an accelerated graphics port, a processing unit, or a local bus using any of a variety of bus architectures.

[0069] The electronic device 500 may also communicate with one or more external devices 1200 (e.g., keyboards, pointing devices, Bluetooth devices, etc.), may also communicate with one or more devices that enable a user to interact with the electronic device 500, and / or communicate with any device that enables the electronic device 500 to communicate with one or more other computing devices (e.g., routers, modems, etc.). Such communication may be performed via an input / output (I / O) interface 550. In addition, the electronic device 500 may also communicate with one or more networks (e.g., local area networks (LANs), wide area networks (WANs), and / or public networks, such as the Internet) via a network adapter 560. As shown, the network adapter 560 communicates with other modules of the electronic device 500 via a bus 530. It should be understood that, although not shown in the figure, other hardware and / or software modules may be used in conjunction with the electronic device 500, including but not limited to: microcode, device drivers, redundant processing units, external disk drive arrays, RAID systems, tape drives, and data backup storage systems.

[0070] Through the description of the above implementation methods, it is easy for those skilled in the art to understand that the example implementation methods described here can be implemented by software or by combining software with necessary hardware. Therefore, the technical solution according to the implementation methods of the present application can be embodied in the form of a software product, which can be stored in a non-volatile storage medium (which can be a CD-ROM, a USB flash drive, a mobile hard disk, etc.) or on a network, and includes several instructions to enable a computing device (which can be a personal computer, a server, a terminal device, or a network device, etc.) to execute the method according to the implementation methods of the present application.

[0071] In addition, the above-mentioned figures are only schematic illustrations of the processes included in the method according to the exemplary embodiments of the present application, and are not intended to be limiting. It is easy to understand that the processes shown in the above-mentioned figures do not indicate or limit the time sequence of these processes. In addition, it is also easy to understand that these processes can be performed synchronously or asynchronously, for example, in multiple modules.

[0072] It should be understood that the present application is not limited to the precise structures that have been described above and shown in the drawings, and that various modifications and changes may be performed without departing from the scope thereof. The scope of the present application is limited only by the appended claims.

Claims

1. A small displacement submersible electric pump control system, characterized in that: The system includes: a liquid level detection and control device, a submersible electric pump control cabinet, a submersible motor, and a liquid replenishment pump; The liquid level detection and control device is remotely connected to the submersible electric pump control cabinet and is wired to the fluid replenishment pump. The liquid level detection and control device is used to control the power supply frequency of the frequency converter in the submersible electric pump control cabinet, control the working mode of the submersible electric pump control cabinet, and control the fluid replenishment pump to perform fluid replenishment operations on the wellbore; The submersible electric pump control cabinet is remotely connected to the liquid level detection and control device, and the submersible electric pump control cabinet is used to adjust the speed of the submersible motor by changing the power supply frequency of the frequency converter; The submersible motor is arranged at the lower end of the oil pipe and between the motor protector and the motor internal cooling pipe group. The submersible motor is used to extract the produced fluid in the wellbore in combination with the submersible pump; The fluid replenishment pump is connected to the liquid level detection and control device by wire, and the fluid replenishment pump is used to replenish the output fluid in the output fluid balance tank into the wellbore.

2. A small displacement submersible electric pump control method, characterized in that: The method comprises: The real-time liquid level in the wellbore is obtained through the liquid level detection and control equipment. If the real-time liquid level reaches or is lower than the warning liquid level, the submersible electric pump control cabinet is controlled by the liquid level detection and control equipment to generate a speed reduction instruction, and the power supply frequency of the frequency converter in the submersible electric pump control cabinet is reduced based on the speed reduction instruction, thereby reducing the speed of the submersible motor; If the rotational speed reaches the minimum rotational speed and the real-time liquid level reaches or is lower than the safety limit liquid level, the fluid replenishment working mode is turned on by the submersible electric pump control cabinet, and the fluid replenishment pump is controlled to replenish the produced fluid in the wellbore, thereby increasing the real-time liquid level in the wellbore, and controlling the real-time liquid level in the wellbore to reach a stable state. The stable state is characterized by the real-time liquid level reaching or being lower than the normal liquid level, and as the submersible motor runs, the change amplitude of the real-time liquid level is less than the preset amplitude.

3. The method according to claim 2, characterized in that After reducing the speed of the submersible motor, the method further comprises: The real-time liquid level in the wellbore is obtained, and if the real-time liquid level reaches a stable state, the submersible motor is operated based on the current rotation speed.

4. The method according to claim 2, characterized in that: The method further comprises: If the real-time liquid level in the wellbore exceeds the normal liquid level, the liquid level detection and control equipment is used to control the submersible electric pump control cabinet to generate a speed-up instruction, and based on the speed-up instruction, the power supply frequency of the inverter in the submersible electric pump control cabinet is increased, thereby increasing the speed of the submersible motor and controlling the real-time liquid level in the wellbore to reach a stable state.

5. The method according to claim 2, characterized in that: In the case where the wellbore produced fluid is heavy oil, the method further comprises: The fluid replenishment pump is controlled to replenish hot water in the wellbore to reduce the viscosity of the produced fluid in the wellbore.

6. The method according to claim 2, characterized in that The method further comprises: The temperature corresponding to the submersible motor is obtained through a temperature measuring sensor. If the temperature is greater than a preset temperature, the fluid replenishing pump is controlled to inject cold water into the submersible motor accessories to reduce the temperature of the submersible motor.

7. The method according to claim 6, characterized in that The preset temperature is 150°C.

8. A small displacement submersible electric pump control device, characterized in that: The device comprises: A first control unit is used to obtain the real-time liquid level in the wellbore through the liquid level detection and control device, and if the real-time liquid level reaches or is lower than the warning liquid level, the submersible electric pump control cabinet is controlled to generate a speed reduction instruction through the liquid level detection and control device, and the power supply frequency of the frequency converter in the submersible electric pump control cabinet is reduced based on the speed reduction instruction, thereby reducing the speed of the submersible motor; The second control unit is used to start the fluid replenishment working mode through the submersible electric pump control cabinet if the rotational speed reaches the minimum rotational speed and the real-time liquid level reaches or is lower than the safety limit liquid level, and control the fluid replenishment pump to replenish the produced fluid in the wellbore, thereby increasing the real-time liquid level in the wellbore, and controlling the real-time liquid level in the wellbore to reach a stable state. The stable state is characterized by the real-time liquid level reaching or being lower than the normal liquid level, and with the operation of the submersible motor, the change amplitude of the real-time liquid level is less than the preset amplitude.

9. A computer-readable storage medium, characterized in that: The computer-readable storage medium stores at least one program code, and the at least one program code is loaded and executed by the processor to implement the operations performed by the method according to any one of claims 2 to 7.

10. An electronic device, characterized in that: The electronic device includes one or more processors and one or more memories, wherein the one or more memories store at least one program code, and the at least one program code is loaded and executed by the one or more processors to implement the operations performed by the method described in any one of claims 2-7.

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