阅读说明：本技术 基于试抽算法的潜油螺杆泵专用闭环控制系统及方法 (Special closed-loop control system and method for submersible screw pump based on trial pumping algorithm ) 是由 熊健伟 李德印 勾国伟 石兴华 陈士坡 常建霞 于 2020-12-30 设计创作，主要内容包括：本发明提供一种基于试抽算法的潜油螺杆泵专用闭环控制系统,包括数据采集单元、传感器、变频控制单元、机组、远程传输单元、后台监控以及显示单元,所述机组、传感器、数据采集单元依次连接,所述数据采集单元通过变频控制单元与机组连接,所述数据采集单元还与显示单元和远程传输单元连接,所述远程传输单元与后台监控连接,所述后台监控与数据采集单元连接。本发明缩短了潜油螺杆泵开机时的沉没度与达到目标沉没度的时间,可以使沉没度快速达到目标沉没度。(The invention provides a special closed-loop control system for an oil-submersible screw pump based on a trial pumping algorithm, which comprises a data acquisition unit, a sensor, a variable frequency control unit, a remote transmission unit and a background monitoring and display unit, wherein the unit, the sensor and the data acquisition unit are sequentially connected, the data acquisition unit is connected with the unit through the variable frequency control unit, the data acquisition unit is also connected with the display unit and the remote transmission unit, the remote transmission unit is connected with the background monitoring, and the background monitoring is connected with the data acquisition unit. The invention shortens the submergence degree when the submersible screw pump is started and the time for reaching the target submergence degree, and can ensure that the submergence degree can quickly reach the target submergence degree.)

1. The utility model provides a special closed-loop control system of latent oil screw pump based on try to take out algorithm which characterized in that: including data acquisition unit, sensor, frequency conversion control unit, teletransmission unit, backstage control and display element, unit, sensor, data acquisition unit connect gradually, the data acquisition unit passes through frequency conversion control unit and unit connection, the data acquisition unit still is connected with display element and teletransmission unit, the teletransmission unit is connected with the backstage control, the backstage control is connected with the data acquisition unit.

2. The submersible screw pump dedicated closed-loop control system based on the trial pumping algorithm of claim 1, characterized in that: the sensor comprises a voltage sensor, a current sensor, a temperature sensor and a rotating speed monitoring module for monitoring the unit, a flow transmitter for monitoring the pipeline flow and a pressure sensor for monitoring the casing pressure and the back pressure.

3. The submersible screw pump dedicated closed-loop control system based on the trial pumping algorithm of claim 2, characterized in that: the data acquisition unit comprises a control module, and the control module comprises a GSM8594 integrated block and a KE02 digital signal processor.

4. The submersible screw pump dedicated closed-loop control system based on the trial pumping algorithm of claim 3, characterized in that: the remote transmission unit is composed of a GPRS module, and data processed by the data acquisition unit is transmitted to the background for monitoring by the remote transmission unit.

5. A closed-loop control method special for a submersible screw pump based on a trial pumping algorithm is characterized by comprising the following steps: firstly, comparing the actual sinking degree with the target sinking degree, and increasing the rotating speed of the motor when the target sinking degree is smaller than the actual sinking degree; and when the target submergence degree is larger than the actual submergence degree, reducing the rotating speed of the motor, changing the current rotating speed of the motor, and finally outputting the rotating speed.

6. The submersible screw pump special closed-loop control method based on the trial pumping algorithm as claimed in claim 5, characterized in that: and (3) adopting two control modes of a single-order closed loop and a double-order closed loop, and calculating the required motor rotating speed by combining the detected sinkage, motor temperature, output rotating speed, pressure, voltage, current and flow operation parameters with closed-loop control setting parameters after each PID (proportion integration differentiation) regulation period is finished.

7. The submersible screw pump special closed-loop control method based on the trial pumping algorithm as claimed in claim 6, characterized in that: when single-order closed-loop control is adopted, the rotating speed is finely adjusted by the difference value of the submergence degree and the target submergence degree through an incremental algorithm after the system is started, and then the running rotating speed is controlled.

8. The submersible screw pump special closed-loop control method based on the trial pumping algorithm as claimed in claim 7, characterized in that: the incremental algorithm u = | M1-M2| × k,

adjusting the rotating speed: u, unit revolutions per minute,

target submergence: m1, the unit of meters,

actual submergence: m2, the unit of meters,

the regulation factor is as follows: k, proportional relationship of the deflection value of the submergence degree and the increasing rotating speed.

9. The submersible screw pump special closed-loop control method based on the trial pumping algorithm as claimed in claim 8, characterized in that: when the double-order closed-loop control is adopted, the operation rotating speed of the motor is adjusted by using an incremental algorithm and a trial-draw algorithm;

when the difference value between the actual submergence degree and the target submergence degree is larger than 10 meters, calculating the rotating speed of the motor corresponding to the liquid supply amount by using a trial pumping algorithm and adjusting the rotating speed;

and when the difference value between the actual submergence degree and the target submergence degree is less than 10 meters, adjusting the running rotating speed of the motor by using an incremental algorithm.

10. The submersible screw pump special closed-loop control method based on the trial pumping algorithm as claimed in claim 9, characterized in that: calculating the rotating speed N of the motor matched with the current oil well liquid supply amount by adopting a trial pumping algorithm₁The assumption is as follows:

suppose pump displacement Q₁Speed N of screw pump₂Proportional ratio, Q₁=K₁×N₂X T, T is time, K₁Is a coefficient of displacement of the pump,

assuming that the oil well liquid supply amount is stable in a short time; when the rotation speed of the pump is N₁The oil well liquid supply quantity is equal to the discharge capacity of the pump:

Q₂＝Q₁＝K₁×N₁×T

when the height value is higher than the set target submergence by a certain height value, the height value is set to be 10 meters, and the set PID highest rotating speed N is used₃Running and recording the time T for the submergence to drop by 10 meters₁And calculating the liquid amount which is decreased by 10 meters:

V₁＝Q₃ – Q₄＝(K₁×N₃×T₁)-( K₁×N₁×T₁)

when the rotating speed is 10 meters below the set target submergence, the set PID minimum rotating speed N is adopted₄Running and recording the time T for the submergence to rise by 10 meters₂And calculating the liquid amount which rises by 10 meters:

V₂＝Q₅-Q₆＝(K₁×N₁×T₂)－(K₁×N₄×T₂)

the following steps can be achieved:

the capacity of the sleeve pipe is decreased by 10 meters, namely the capacity of the sleeve pipe is increased by 10 meters

V₁＝V₂

Q₃-Q₄＝Q₅-Q₆

(K₁×N₃×T₁)-(K₁×N₁×T₁)＝(K₁×N₁×T₂)-(K₁×N₄×T₂)

N1=((N₃×T₁)+(N₄×T₂))/(T₁+T₂)

N₃: the high rotating speed value is set to be high,

T₁: the time taken for the submergence to drop by 10 meters,

N₄: the rotating speed value is low, and the rotating speed value is low,

T₂: the time taken for the submergence to rise by 10 meters,

N₁: the corresponding motor rotating speed is balanced for mining,

V₁: the amount of liquid required to reduce the submergence when the current submergence is higher than the target submergence,

V₂: the amount of liquid for raising the submergence is required when the current submergence is lower than the target submergence,

Q₃: a discharge capacity at a high rotation speed when the degree of submergence is higher than a target value,

Q₄: the liquid discharge amount at the current rotation speed when the submergence degree is higher than the target value,

Q₆: submergence degree lower thanThe discharge capacity at the lowest rotation speed at the target value,

Q₅: and discharging liquid at the current rotating speed when the submergence degree is lower than the target value.

Technical Field

The invention relates to the technical field of submersible screw pumps, in particular to a special closed-loop control system and method for a submersible screw pump based on a trial pumping algorithm.

Background

The prior submersible screw pump is suitable for discharging viscous liquid and solid-phase-containing liquid, and has uniform and stable flow, thereby being widely applied. However, the screw pump is difficult to start, and the long time for reaching the target submergence degree also reduces the utilization rate of the submersible screw pump.

With the continuous development of oil fields, the sinking degree of an oil well becomes an important parameter of the oil field for controlling the liquid level of the oil well. It is also important to quickly bring the submergence to the target submergence. The rapid stabilization of the submergence can avoid unnecessary problems such as equipment damage, theft and stop and the like, so that the oil well can normally run. Therefore, a closed-loop control model special for a screw pump is needed to rapidly stabilize the submergence degree and enable the submergence degree to rapidly reach a target value.

Disclosure of Invention

In view of this, the invention provides a special closed-loop control system and method for a submersible screw pump based on a trial pumping algorithm, which shortens the submergence degree and the time for reaching the target submergence degree when the submersible screw pump is started, and can enable the submergence degree to quickly reach the target submergence degree.

In order to solve the technical problems, the invention provides a closed-loop control system special for an oil-submersible screw pump based on a trial pumping algorithm, which comprises a data acquisition unit, a sensor, a variable frequency control unit, a remote transmission unit, a background monitoring unit and a display unit, wherein the unit, the sensor and the data acquisition unit are sequentially connected, the data acquisition unit is connected with the unit through the variable frequency control unit, the data acquisition unit is also connected with the display unit and the remote transmission unit, the remote transmission unit is connected with the background monitoring unit, and the background monitoring unit is connected with the data acquisition unit.

Furthermore, the sensor includes a voltage sensor, a current sensor, a temperature sensor and a rotating speed monitoring module for monitoring the unit, a flow transmitter for monitoring the pipeline flow and a pressure sensor for monitoring the casing pressure and the back pressure.

Further, the data acquisition unit comprises a control module, and the control module comprises a GSM8594 integrated block and a KE02 digital signal processor.

Furthermore, the remote transmission unit is composed of a GPRS module, and data processed by the data acquisition unit is transmitted to the background for monitoring by the remote transmission unit.

A special closed-loop control method for a submersible screw pump based on a trial pumping algorithm comprises the steps of firstly, comparing the actual submergence degree with the target submergence degree, and increasing the rotating speed of a motor when the target submergence degree is smaller than the actual submergence degree; and when the target submergence degree is larger than the actual submergence degree, reducing the rotating speed of the motor, changing the current rotating speed of the motor, and finally outputting the rotating speed.

Furthermore, a single-order closed loop control mode and a double-order closed loop control mode are adopted, and after each PID regulation period is finished, the required motor rotating speed is calculated through detected submergence, motor temperature, output rotating speed, pressure, voltage, current and flow operation parameters and combination of closed-loop control setting parameters.

Furthermore, when single-order closed-loop control is adopted, the rotating speed is finely adjusted by the difference value of the submergence degree and the target submergence degree through an incremental algorithm after the system is started, and then the running rotating speed is controlled.

Further, the incremental algorithm u = | M1-M2| × k,

adjusting the rotating speed: u, unit revolutions per minute,

target submergence: m1, the unit of meters,

actual submergence: m2, the unit of meters,

the regulation factor is as follows: k, proportional relationship of the deflection value of the submergence degree and the increasing rotating speed.

Further, when the double-order closed-loop control is adopted, the running rotating speed of the motor is adjusted by using an incremental algorithm and a trial-and-error algorithm;

when the difference value between the actual submergence degree and the target submergence degree is larger than 10 meters, calculating the rotating speed of the motor corresponding to the liquid supply amount by using a trial pumping algorithm and adjusting the rotating speed;

and when the difference value between the actual submergence degree and the target submergence degree is less than 10 meters, adjusting the running rotating speed of the motor by using an incremental algorithm.

Further, a trial pumping algorithm is adopted to calculate the rotating speed N of the motor matched with the current oil well liquid supply amount₁The assumption is as follows:

suppose pump displacement Q₁Speed N of screw pump₂Proportional ratio, Q₁=K₁×N₂X T, T is time, K₁Is a coefficient of displacement of the pump,

assuming that the oil well liquid supply amount is stable in a short time; when the rotation speed of the pump is N₁The oil well liquid supply quantity is equal to the discharge capacity of the pump:

Q₂＝Q₁＝K₁×N₁×T

when the height value is higher than the set target submergence by a certain height value, the height value is set to be 10 meters, and the set PID highest rotating speed N is used₃Running and recording the time T for the submergence to drop by 10 meters₁And calculating the liquid amount which is decreased by 10 meters:

V₁＝Q₃– Q₄＝(K₁×N₃×T₁)-( K₁×N₁×T₁)

when the rotating speed is 10 meters below the set target submergence, the set PID minimum rotating speed N is adopted₄Running and recording the time T for the submergence to rise by 10 meters₂And calculating the liquid amount which rises by 10 meters:

V₂＝Q₅-Q₆＝(K₁×N₁×T₂)－(K₁×N₄×T₂)

the following steps can be achieved:

the capacity of the sleeve pipe is decreased by 10 meters, namely the capacity of the sleeve pipe is increased by 10 meters

V₁＝V₂

Q₃-Q₄＝Q₅-Q₆

(K₁×N₃×T₁)-(K₁×N₁×T₁)＝(K₁×N₁×T₂)-(K₁×N₄×T₂)

N1=((N₃×T₁)+(N₄×T₂))/(T₁+T₂)

N₃: the high rotating speed value is set to be high,

T₁: the time taken for the submergence to drop by 10 meters,

N₄: the rotating speed value is low, and the rotating speed value is low,

T₂: the time taken for the submergence to rise by 10 meters,

N₁: the corresponding motor rotating speed is balanced for mining,

V₁: the amount of liquid required to reduce the submergence when the current submergence is higher than the target submergence,

V₂: the amount of liquid for raising the submergence is required when the current submergence is lower than the target submergence,

Q₃: a discharge capacity at a high rotation speed when the degree of submergence is higher than a target value,

Q₄: the liquid discharge amount at the current rotation speed when the submergence degree is higher than the target value,

Q₆: the liquid discharge amount at the lowest rotation speed when the submergence degree is lower than the target value,

Q₅: and discharging liquid at the current rotating speed when the submergence degree is lower than the target value.

The technical scheme of the invention has the following beneficial effects:

the control system takes the data acquisition unit as a main control system, processes information by acquiring the conditions of the unit through the sensor, and sends the processed information to the background monitoring system and the variable frequency control unit. The frequency conversion control unit performs closed-loop operation on the unit through the frequency converter, and then the unit feeds back the operated condition to the sensor to form closed-loop operation.

The main control algorithm consists of a calculation method and closed-loop processing, wherein the calculation method consists of an incremental algorithm and a trial extraction algorithm, and the closed-loop processing consists of single-order closed-loop processing and double-order closed-loop processing. The invention shortens the submergence degree when the submersible screw pump is started and the time for reaching the target submergence degree, and can ensure that the submergence degree can quickly reach the target submergence degree.

The closed-loop regulation adopted by the conventional submersible screw pump is to slowly reduce the submergence degree to enable the submergence degree to reach a target value, the special closed-loop control model firstly uses the maximum rotating speed to rapidly reduce the submergence degree, and then adjusts the rotating speed to enable the submergence degree to slowly reduce to reach the target submergence degree after the target submergence degree is reached. Compared with the conventional closed-loop regulation of the submersible screw pump, the special closed-loop control model has the following advantages: 1) the reaction speed is high, and the rotating speed of the motor can be quickly adjusted according to the target submergence degree to reach the target submergence degree in the shortest time. 2) The special closed-loop control model can quickly stabilize the liquid level when the oil well submergence degree is greatly floated.

Drawings

FIG. 1 is a system block diagram of the control system of the present invention;

FIG. 2 is a diagram of an incremental algorithm of the present invention;

FIG. 3 is a single-order closed-loop control diagram of the present invention;

FIG. 4 is a dual-level closed-loop control diagram of the present invention.

Detailed Description

In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to fig. 1 to 4 of the embodiments of the present invention. It is to be understood that the embodiments described are only a few embodiments of the present invention, and not all embodiments. All other embodiments, which can be derived by a person skilled in the art from the described embodiments of the invention, are within the scope of the invention.

Example one

The embodiment provides a special closed-loop control system of latent oil screw pump based on trying to draw algorithm, including data acquisition unit, sensor, frequency conversion control unit, teletransmission unit, backstage control and display element, unit, sensor, data acquisition unit connect gradually, data acquisition unit passes through frequency conversion control unit and unit connection, data acquisition unit still is connected with display element and teletransmission unit, teletransmission unit is connected with the backstage control, the backstage control is connected with data acquisition unit.

The system transmits information acquired by the sensor to the data acquisition unit for data processing, and after the data acquisition unit processes the information, the processed information is sent to the frequency converter and the remote transmission unit. The frequency converter receives the information of the data acquisition unit and then correspondingly controls the unit, and the remote transmission unit receives the information of the data acquisition unit and then remotely transmits the information to the monitoring background for real-time monitoring.

The sensor comprises a voltage sensor, a current sensor, a temperature sensor and a rotating speed monitoring module for monitoring the unit, a flow transmitter for monitoring the pipeline flow and a pressure sensor for monitoring the casing pressure and the back pressure.

The data acquisition unit comprises a control module, and the control module comprises a GSM8594 integrated block and a KE02 digital signal processor.

The remote transmission unit is composed of a GPRS module, and data processed by the data acquisition unit is transmitted to the background for monitoring by the remote transmission unit.

The master control algorithm resides in the data acquisition unit. The sensor transmits the underground condition to the data acquisition unit in a digital quantity mode by acquiring signals such as voltage, current, temperature and the like of the underground motor, and the GSM8594 integrated block of the data acquisition unit processes information and summarizes the information to the master control algorithm of the integrated block. The main control algorithm feeds back the processed information to the frequency converter and the remote transmission unit, the frequency converter adjusts the running state of the unit through the processed information, and the remote transmission unit remotely transmits the information to the background monitoring software through the GPRS module. The main control algorithm of the data acquisition unit is divided into a calculation method and closed-loop processing, the calculation method is divided into an increment algorithm and a trial extraction algorithm, and the closed-loop processing is divided into a single-order closed loop and a double-order closed loop.

Example two

The embodiment provides a special closed-loop control method for a submersible screw pump based on a trial pumping algorithm, which comprises the steps of firstly, comparing the actual submergence degree with the target submergence degree, and when the target submergence degree is smaller than the actual submergence degree, increasing the rotating speed of a motor; and when the target submergence degree is larger than the actual submergence degree, reducing the rotating speed of the motor, changing the current rotating speed of the motor, and finally outputting the rotating speed.

And (3) adopting two control modes of a single-order closed loop and a double-order closed loop, and calculating the required motor rotating speed by combining the detected sinkage, motor temperature, output rotating speed, pressure, voltage, current and flow operation parameters with closed-loop control setting parameters after each PID (proportion integration differentiation) regulation period is finished.

When single-order closed-loop control is adopted, the rotating speed is finely adjusted by the difference value of the submergence degree and the target submergence degree through an incremental algorithm after the system is started, and then the running rotating speed is controlled.

The incremental algorithm u = | M1-M2| × k,

adjusting the rotating speed: u, unit revolutions per minute,

target submergence: m1, the unit of meters,

actual submergence: m2, the unit of meters,

the regulation factor is as follows: k, proportional relationship of the deflection value of the submergence degree and the increasing rotating speed.

When the double-order closed-loop control is adopted, the operation rotating speed of the motor is adjusted by using an incremental algorithm and a trial-draw algorithm;

when the difference value between the actual submergence degree and the target submergence degree is larger than 10 meters, calculating the rotating speed of the motor corresponding to the liquid supply amount by using a trial pumping algorithm and adjusting the rotating speed;

and when the difference value between the actual submergence degree and the target submergence degree is less than 10 meters, adjusting the running rotating speed of the motor by using an incremental algorithm.

Calculating the rotating speed N of the motor matched with the current oil well liquid supply amount by adopting a trial pumping algorithm₁The assumption is as follows:

suppose pump displacement Q₁Speed N of screw pump₂Proportional ratio, Q₁=K₁×N₂X T, T is time, K₁Is a coefficient of displacement of the pump,

assuming that the oil well liquid supply amount is stable in a short time; when the rotation speed of the pump is N₁The oil well liquid supply quantity is equal to the discharge capacity of the pump:

Q₂＝Q₁＝K₁×N₁×T

when the height value is higher than the set target submergence by a certain height value, the height value is set to be 10 meters, and the set PID highest rotating speed N is used₃Run and record the time taken for the subsidence to drop by 10 metersInter T₁And calculating the liquid amount which is decreased by 10 meters:

V₁＝Q₃– Q₄＝(K₁×N₃×T₁)-( K₁×N₁×T₁)

when the rotating speed is 10 meters below the set target submergence, the set PID minimum rotating speed N is adopted₄Running and recording the time T for the submergence to rise by 10 meters₂And calculating the liquid amount which rises by 10 meters:

V₂＝Q₅-Q₆＝(K₁×N₁×T₂)－(K₁×N₄×T₂)

the following steps can be achieved:

the capacity of the sleeve pipe is decreased by 10 meters, namely the capacity of the sleeve pipe is increased by 10 meters

V₁＝V₂

Q₃-Q₄＝Q₅-Q₆

(K₁×N₃×T₁)-(K₁×N₁×T₁)＝(K₁×N₁×T₂)-(K₁×N₄×T₂)

N1=((N₃×T₁)+(N₄×T₂))/(T₁+T₂)

N₃: the high rotating speed value is set to be high,

T₁: the time taken for the submergence to drop by 10 meters,

N₄: the rotating speed value is low, and the rotating speed value is low,

T₂: the time taken for the submergence to rise by 10 meters,

N₁: the corresponding motor rotating speed is balanced for mining,

V₁: the amount of liquid required to reduce the submergence when the current submergence is higher than the target submergence,

V₂: the amount of liquid for raising the submergence is required when the current submergence is lower than the target submergence,

Q₃: a discharge capacity at a high rotation speed when the degree of submergence is higher than a target value,

Q₄: at the current rotating speed when the submergence degree is higher than the target valueThe amount of liquid discharged from the liquid discharge pipe (c),

Q₆: the liquid discharge amount at the lowest rotation speed when the submergence degree is lower than the target value,

Q₅: and discharging liquid at the current rotating speed when the submergence degree is lower than the target value.

In the present invention, unless otherwise explicitly specified or limited, for example, it may be fixedly attached, detachably attached, or integrated; can be mechanically or electrically connected; the terms may be directly connected or indirectly connected through an intermediate, and may be communication between two elements or interaction relationship between two elements, unless otherwise specifically limited, and the specific meaning of the terms in the present invention will be understood by those skilled in the art according to specific situations.

While the foregoing is directed to the preferred embodiment of the present invention, it will be understood by those skilled in the art that various changes and modifications may be made without departing from the spirit and scope of the invention as defined in the appended claims.