CN-122014602-A - Regulating and controlling method, device and medium for electric submersible screw pump dry grinding and airlock

CN122014602ACN 122014602 ACN122014602 ACN 122014602ACN-122014602-A

Abstract

The application discloses a regulating and controlling method, equipment and medium for dry grinding and airlock of an electric submersible screw pump, and relates to the technical field of fault regulation and control of mining equipment. The method comprises the steps of obtaining motor winding temperature data, pump inlet pressure data and unit vibration data in the operation process of the electric submersible screw pump, extracting temperature change rate and pressure fluctuation amplitude according to the motor winding temperature data and the pump inlet pressure data respectively, extracting energy values of preset frequency bands in a vibration frequency spectrum according to the unit vibration data, inputting the temperature change rate, the pressure fluctuation amplitude and the energy values of the preset frequency bands into a pre-built risk identification model, outputting a risk type, and carrying out a self-adaptive regulation and control sequence when the output risk type is dry grinding risk or airlock risk. According to the method, the multi-parameter fusion identification of the dry grinding risk and the air lock risk is realized, the early symptoms of the two fault modes can be accurately distinguished, and misjudgment and missed judgment caused by single parameter monitoring are avoided.

Inventors

ZENG GANG
ZHAO XIHUI
TAN GUANGXING
JIANG PENG
JIANG JINGXUAN

Assignees

德仕(西安)油气举升技术有限公司
德仕(西安)石油技术服务有限公司

Dates

Publication Date: 20260512
Application Date: 20260414

Claims (10)

1. The method for regulating and controlling the dry grinding and the airlock of the electric submersible screw pump is characterized by comprising the following steps of: acquiring motor winding temperature data, pump inlet pressure data and unit vibration data in the operation process of the electric submersible screw pump; Extracting a temperature change rate and a pressure fluctuation amplitude according to the motor winding temperature data and the pump inlet pressure data respectively, and extracting an energy value of a preset frequency band in a vibration frequency spectrum according to the unit vibration data; Inputting the temperature change rate, the pressure fluctuation amplitude and the energy value of a preset frequency band to a pre-constructed risk identification model, and outputting risk types, wherein the risk types comprise dry grinding risk, airlock risk and risk-free; And when the output risk type is dry grinding risk or airlock risk, performing an adaptive regulation sequence, wherein the adaptive regulation sequence comprises a deceleration stage, a pulse recoil stage and a recovery stage which are sequentially executed.
2. The method for regulating and controlling the dry grinding and the airlock of the electric submersible screw pump according to claim 1, wherein the method for acquiring the temperature data of the motor winding, the pressure data of the pump inlet and the vibration data of the unit in the operation process of the electric submersible screw pump specifically comprises the following steps: the motor winding temperature data is obtained through the inversion of the electrical parameters of the motor winding, and the method specifically comprises the following steps: Injecting a high-frequency detection signal into the motor winding, and collecting impedance spectrum characteristics of the motor winding; And calculating to obtain the temperature data of the motor winding according to the mapping relation between the impedance spectrum characteristics and the temperature.
3. The method for controlling dry grinding and airlock of an electric submersible screw pump according to claim 1, wherein before the extracting the energy value of the preset frequency band in the vibration spectrum according to the unit vibration data, the method further comprises: Performing blind source separation on the unit vibration data to obtain a motor excitation source component, a fluid excitation source component and a mechanical friction source component; and extracting the energy value of the preset frequency band from the mechanical friction source component so as to eliminate the interference of motor excitation and fluid excitation on dry grinding characteristic identification.
4. The method for controlling dry grinding and airlock of an electric submersible screw pump according to claim 3, wherein the extracting the temperature change rate and the pressure fluctuation amplitude according to the motor winding temperature data and the pump inlet pressure data, and extracting the energy value of the preset frequency band in the vibration spectrum according to the unit vibration data specifically comprises: extracting a temperature difference value and a time interval of the temperature data of the motor winding in a sliding time window to obtain the temperature change rate; Extracting the maximum pressure value and the minimum pressure value of the pump inlet pressure data in a sliding time window to obtain the pressure fluctuation amplitude; And performing fast Fourier transform on the mechanical friction source component to obtain a vibration spectrum, and extracting an energy value of a preset frequency range in the vibration spectrum, wherein the preset frequency range corresponds to a characteristic frequency range generated by dry friction between a rotor and a stator.
5. The method for controlling the dry grinding and airlock of the electric submersible screw pump according to claim 1, wherein the steps of inputting the temperature change rate, the pressure fluctuation amplitude and the energy value of the preset frequency band into a pre-constructed risk identification model and outputting a risk type comprise the following steps: Determining a contact force threshold according to a preset interference between a rotor and a stator of the electric submersible screw pump and allowable contact stress of a stator rubber material; In a bench test, when the contact force between the rotor and the stator reaches the contact force threshold value, acquiring a first temperature change rate, a first pressure fluctuation amplitude value and a first vibration spectrum energy value as a dry grinding risk feature center; determining a gas phase volume fraction threshold according to the influence relationship of the gas phase volume fraction at the pump inlet of the electric submersible screw pump on the pump efficiency; In a bench test, when the gas phase volume fraction at the inlet of the pump reaches the gas phase volume fraction threshold, acquiring a second temperature change rate, a second pressure fluctuation amplitude and a second vibration spectrum energy value as an airlock risk characteristic center; in a bench test under the rated working condition of the electric submersible screw pump, collecting a third temperature change rate, a third pressure fluctuation amplitude and a third vibration spectrum energy value as risk-free feature centers; And calculating the similarity among the temperature change rate, the pressure fluctuation amplitude and the energy value of the preset frequency band, the dry grinding risk feature center, the airlock risk feature center and the risk-free feature center, and determining the risk type.
6. The method for controlling the dry grinding and the airlock of the electric submersible screw pump according to claim 1, wherein when the outputted risk type is a dry grinding risk or an airlock risk, the method for controlling the electric submersible screw pump in a self-adaptive manner comprises the following steps: reducing the rotation speed of the electric submersible screw pump to a first target rotation speed at a preset speed reduction rate, maintaining a first preset duration, and continuously monitoring pump inlet pressure data; if the pump inlet pressure data is restored to the normal value in the deceleration process, ending the deceleration stage and entering a recovery stage.
7. The method for controlling dry grinding and airlock of an electric submersible screw pump according to claim 6, further comprising: after the deceleration stage is finished, entering the pulse recoil stage, and controlling the rotating speed of the electric submersible screw pump to alternately accelerate and decelerate in a preset pulse mode to generate pressure pulses so as to break an airlock; the pulse mode comprises a plurality of pulse periods, and each pulse period comprises a process of accelerating to a second target rotating speed and then decelerating to a third target rotating speed immediately; And continuously monitoring the pump inlet pressure data and the unit vibration data in the pulse backflushing stage, and ending the pulse backflushing stage when the pump inlet pressure data is stable and the energy value of a preset frequency band in a vibration frequency spectrum is lower than a preset threshold value.
8. The method for controlling dry grinding and airlock of an electric submersible screw pump according to claim 7, further comprising: After the pulse recoil phase is finished, the rotating speed of the electric submersible screw pump is increased to the original rotating speed at a preset speed increasing rate; And in the speed increasing process, acquiring the temperature data of the motor winding, the pressure data of the pump inlet and the vibration data of the unit in real time.
9. An electric submersible screw pump dry grinding and airlock regulation and control device, characterized in that the device comprises: At least one processor; And a memory communicatively coupled to the at least one processor; Wherein the memory stores instructions executable by the at least one processor, the instructions are executable by the at least one processor to enable the at least one processor to: A step of performing a method for controlling dry grinding and airlock of an electric submersible screw pump according to any one of claims 1 to 8.
10. A non-volatile computer storage medium storing computer executable instructions for regulating and controlling electric submersible screw pump dry grinding and airlock, characterized in that the computer executable instructions are configured to: A step of performing a method for controlling dry grinding and airlock of an electric submersible screw pump according to any one of claims 1 to 8.

Description

Regulating and controlling method, device and medium for electric submersible screw pump dry grinding and airlock Technical Field The application relates to the technical field of fault regulation and control of mining equipment, in particular to a method, equipment and medium for regulating and controlling dry grinding and airlock of an electric submersible screw pump. Background The electric submersible screw pump is used as artificial lifting equipment and widely applied to exploitation operation of thick oil, high sand content, high inclination and other complex well conditions, during operation of the electric submersible screw pump, when underground liquid supply is insufficient, liquid lubrication and cooling are lacking in the pump, dry grinding can occur between a rotor and a stator to cause rapid ablation damage of stator rubber, and when the gas content in well liquid is too high, gas is accumulated in a pump inlet to form an air lock to cause rapid drop of pump efficiency and even impossible liquid drainage. These two failure modes are the most common failure causes of the electric submersible screw pump, and seriously affect equipment life and oil recovery efficiency. In the prior art, early warning of risk of dry grinding and air lock mainly depends on single parameter monitoring, such as judging liquid supply condition through pump inlet pressure or judging load change through motor current, however, single parameter is difficult to accurately distinguish early symptoms of dry grinding and air lock, misjudgment or missed judgment is easy to cause, and in the prior art, shutdown protection measures are adopted after faults occur, active intervention cannot be carried out before the faults occur, and continuous production and maximization of equipment life are difficult to achieve. Through the above analysis, the problems and defects existing in the prior art are as follows: The electric submersible screw pump in the prior art carries out dry grinding and airlock early warning, and early symptoms of the dry grinding and airlock cannot be accurately distinguished, and intervention cannot be carried out before faults occur. Disclosure of Invention The embodiment of the application provides a regulating and controlling method, equipment and medium for dry grinding and airlock of an electric submersible screw pump, which can solve the problems that the early warning of the dry grinding and airlock of the electric submersible screw pump in the prior art cannot be accurately distinguished, and the early symptoms of the dry grinding and airlock cannot be interfered before the fault occurs. The embodiment of the application provides a method for regulating and controlling dry grinding and airlock of an electric submersible screw pump, which is characterized by comprising the steps of obtaining motor winding temperature data, pump inlet pressure data and unit vibration data in the operation process of the electric submersible screw pump, respectively extracting temperature change rate and pressure fluctuation amplitude according to the motor winding temperature data and the pump inlet pressure data, extracting energy values of preset frequency bands in a vibration frequency spectrum according to the unit vibration data, inputting the temperature change rate, the pressure fluctuation amplitude and the energy values of the preset frequency bands into a pre-built risk identification model, outputting risk types, wherein the risk types comprise dry grinding risk, airlock risk and no risk, and performing an adaptive regulating sequence when the outputted risk types are dry grinding risk or airlock risk, wherein the adaptive regulating sequence comprises a speed reduction stage, a pulse recoil stage and a recovery stage which are sequentially executed. In one implementation mode of the application, motor winding temperature data, pump inlet pressure data and unit vibration data in the operation process of the electric submersible screw pump are obtained, and the method specifically comprises the steps of obtaining the motor winding temperature data through inversion of electrical parameters of the motor winding, specifically comprising the steps of injecting high-frequency detection signals into the motor winding, collecting impedance spectrum characteristics of the motor winding, and calculating to obtain the motor winding temperature data according to the mapping relation between the impedance spectrum characteristics and temperature. In one implementation mode of the application, before the energy value of the preset frequency band in the vibration spectrum is extracted according to the unit vibration data, the method further comprises blind source separation of the unit vibration data to obtain a motor excitation source component, a fluid excitation source component and a mechanical friction source component, wherein the energy value of the preset frequency band is extracted in the mechanical friction sou