CN211230404U

CN211230404U - Flexible frequency conversion energy-saving control system of oil beam type pumping unit based on electrical parameters

Info

Publication number: CN211230404U
Application number: CN202020963422.XU
Authority: CN
Inventors: 吴广大; 路长宁; 信伟刚; 孙茂平
Original assignee: Liaoning Hongyi Technology Co ltd
Current assignee: Liaoning Hongyi Technology Co ltd
Priority date: 2020-06-01
Filing date: 2020-06-01
Publication date: 2020-08-11
Anticipated expiration: 2030-06-01

Abstract

The utility model provides an oil beam type pumping unit flexible frequency conversion energy-saving control system based on electrical parameters, belonging to the technical field of oil field oil extraction and comprising a driving motor on the oil beam type pumping unit; the frequency converter is used for adjusting the power of the driving motor; the electric parameter acquisition module is used for acquiring electric parameter data of the driving motor; the dead point detection module is used for detecting the position signals of the upper dead point and the lower dead point of the pumping unit; the control unit is based on receiving the electricity parameter data with upper and lower dead point position signal, to the converter sends control signal in order to adjust driving motor's power, the beneficial effects of the utility model are that come each section beam-pumping unit speed in the single oil pumping cycle of real-time speed governing control beam-pumping unit, can reduce the violent change of electric current, reduce the maximum load of beam-pumping unit, improve power factor, reduce the impact to the electric wire netting, improved the time of the liquid filling process of oil-well pump, can improve the fullness of oil-well pump, improve the pump efficiency, indirectly improved oil pumping system's efficiency.

Description

Flexible frequency conversion energy-saving control system of oil beam type pumping unit based on electrical parameters

Technical Field

The utility model belongs to the technical field of the oil field oil recovery, concretely relates to flexible frequency conversion energy-saving control system of oil beam formula beam-pumping unit based on electrical parameter.

Background

At present, most oil beam type pumping units in oil fields adopt a power frequency direct drive motor to drive the pumping unit to work, or adopt a variable frequency drive motor to run at a fixed speed. As a result of the four connecting rods of the pumping unit, in the process of the alternating change of the motion directions of the upper dead point and the lower dead point of the pumping unit, the driving current changes rapidly, the stress of a polished rod of the pumping unit also changes rapidly, the energy consumption is high, and the impact on the pumping unit is large. Up-stroke impacts can sometimes break the sucker rod.

Because of the fixed structure of the oil beam type pumping unit, the pumping unit is driven at a fixed frequency, and the point selection displacement of the pumping unit is in a distribution shape of forced sine-like periodic motion. The stress of the selected point of the polished rod is similar to the sine periodic variation. When the oil pumping machine is at the upper dead point and the lower dead point, the periodic reciprocating motion of the polished rod of the oil pumping machine is changed, the speed of the motor is unchanged, so that the stress is changed greatly, the change of the driving current is also large, the fixed acceleration and deceleration process enables the rod column to bear large vibration and inertia load, the process has large damage to the transmission structure of the oil pumping machine and the oil pumping rod, even breaks the oil pumping rod, and the electric energy is wasted.

SUMMERY OF THE UTILITY MODEL

In order to solve the technical problem existing in at least one prior art or the related art, the utility model aims at providing a flexible frequency conversion energy-saving control system of beam-pumping unit based on electrical parameter.

The technical scheme of the utility model is that: a flexible frequency conversion energy-saving control system of an oil beam type pumping unit based on electrical parameters comprises a driving motor on the oil beam type pumping unit;

the frequency converter is used for adjusting the power of the driving motor;

the electric parameter acquisition module is used for acquiring electric parameter data of the driving motor;

and the dead point detection module is used for detecting the position signals of the upper dead point and the lower dead point of the pumping unit and changing the motion direction of a polished rod of the pumping unit after passing through the dead point.

And the control unit is used for sending a control signal to the frequency converter to adjust the power of the driving motor based on the received electrical parameter data and the upper dead point position signal and the lower dead point position signal.

The driving speed of the oil beam type oil pumping unit at different positions is changed to enable the motion speed of the oil pumping unit to change in a sine-like period, and the change of the stress F is reduced, so that the impact of the oil pumping system is reduced, the service life of the oil pumping system is prolonged, and the failure rate is reduced. And because the stress change is reduced, the impact of the current is reduced, and therefore, the consumption of part of energy can be reduced.

The period of the pumping unit with the pumping speed similar to sine is determined by the structure of the pumping unit, and the four-bar structure of the pumping unit converts the uniform rotation of the motor into the reciprocating motion of the polished rod eye pulling the pumping rod.

The method comprises the steps of collecting electrical parameter data of the oil pumping unit in real time in the operation process of the oil beam type oil pumping unit, and detecting the positions of upper and lower dead centers of the oil pumping unit. And transmitting the data to a master control computer of the oil pumping unit in real time to identify the real-time running state of the oil pumping unit. And the optimal frequency of the flexible control of the pumping unit is calculated in real time by combining the operating parameters of the pumping unit, and the electric parameter acquisition module is connected and communicated with the controller through a 485 interface.

The electric parameter acquisition module acquires electric parameter data to analyze the current consumption condition of the pumping unit, so that the motion condition of the pumping unit is judged. When the polish rod of the pumping unit moves upwards through the central point, the speed is gradually reduced, the current is gradually reduced, and the control unit usually does not search the central point. The output frequency of the frequency converter can be properly reduced according to the current variation trend, so that the underground oil well pump can improve the fullness and provide time. When the polished rod of the pumping unit reaches the top dead center and starts to move downwards, the load unloading point of the polished rod of the pumping unit is searched, the pumping unit is in an idle stroke, and the pumping unit can run at a constant speed. When the pumping unit reaches the unloading point, the suspension point load of the polished rod of the pumping unit is sharply reduced, the elastic deformation process of the rod column is released, the speed can be reduced at the moment, a certain lifting load is kept, and the shape of the rod column is positioned to prevent bending deformation. After unloading to the lowest point, when the pumping unit operates to the bottom dead center, the pumping unit downhole pump plunger compresses the liquid in the pump, a certain lifting load is still kept, and the pumping unit operates at the minimum speed. When the device runs through the bottom dead center and runs upwards, the deformation process of the rod column needs to be accelerated, and the parameters are moving inertia.

And searching the unloading point, wherein after the pumping unit passes through the upper dead point, a polished rod of the pumping unit moves downwards, and when the point of the sudden drop of the detected current is the unloading point.

The idle stroke of the oil pumping unit is mainly the deformation process of the oil pumping rod.

Further, the electric parameter collecting module collects the electric parameters of the driving motor, such as voltage, current, active power, reactive power, apparent load power and power factors.

Further defined, the electrical parameter acquisition module acquires electrical parameter data 20 times per second.

Further limited, the dead point detection module comprises two magnetic control hall switches and two magnets.

Further, the magnetic control Hall switches are respectively arranged at the positions of an upper dead point and a lower dead point, the crank arm of the oil engine is provided with two magnets for detecting the correspondence between the upper dead point and the lower dead point, and when the crank arm rotates, the corresponding magnet positions can trigger signals of the upper dead point and the lower dead point.

Further limited, the control unit is a PLC controller component, and the PLC controller component is formed by adding a control module which needs to be plugged into the PLC controller.

Further defined, the control unit controls the frequency converter to adjust the power of the driving motor based on receiving the current change in the electrical parameter and the top and bottom dead center position signals.

The utility model has the advantages and positive effects that: by adopting the technical scheme, the driving speed of the oil beam type oil pumping unit at different positions is changed to enable the pumping speed of the oil pumping unit to change in a sine-like period, and the change of the stress F is reduced, so that the impact of the oil pumping system is reduced, the service life of the oil pumping system is prolonged, and the failure rate is reduced. And because the stress change is reduced, the impact of the current is reduced, and therefore, the consumption of part of energy can be reduced.

The method has the advantages that the operation state of the beam-type pumping unit is fed back in real time based on the electrical parameter data as measurement feedback data, the speed of each section of the pumping unit in a single pumping period of the pumping unit is controlled in real time through speed regulation, violent change of current can be reduced, the maximum load of the pumping unit is reduced, impact on a power grid is reduced, the time of a liquid filling process of the oil well pump is prolonged in the movement process, the fullness of the oil well pump can be improved, the pump efficiency is improved, and the efficiency of the oil pumping system is indirectly improved.

Drawings

Fig. 1 is a block diagram of the circuit connection structure of the present invention.

Fig. 2 is a schematic diagram of the positions of the magnetic control hall switch and the magnet on the crank arm of the oil engine.

In the figure: 1. the device comprises a driving motor, 2, a frequency converter, 3, a control unit, 4, a dead point detection module, 5, an electrical parameter acquisition module, 41, a magnetic control Hall switch, 42 and a magnet.

Detailed Description

As shown in fig. 1-2, the utility model relates to a flexible frequency conversion energy-saving control system of oil beam formula beam-pumping unit based on electrical parameter, including driving motor 1 on the oil beam formula beam-pumping unit, driving motor 1 is connected with 2 electricity on the converter, and the control unit 3 is connected with 2 electricity on the converter, and dead point detection module 4 is connected with 3 electricity on the control unit respectively with electrical parameter collection module 5 to electrical parameter collection module still is connected with driving motor 1 electricity.

The electric parameter acquisition module 5 acquires the electric parameters of the driving motor, such as voltage, current, active power, reactive power, apparent load power and power factors.

The electrical parameter acquisition module 5 acquires electrical parameter data 20 times per second.

The dead point detection module 4 comprises a magnetic control hall switch 41 and a magnet 42, wherein the magnetic control hall switch 41 is respectively installed at the position of an upper dead point and a lower dead point, and the crank arm of the oil engine is provided with two magnets 42 for detecting the upper dead point and the lower dead point.

The control unit 3 is a PLC controller assembly.

While one embodiment of the present invention has been described in detail, the description is only a preferred embodiment of the present invention, and should not be considered as limiting the scope of the present invention. All the equivalent changes and improvements made according to the application scope of the present invention should still fall within the patent coverage of the present invention.

In the description of the present invention, it should be understood that the terms "left", "right", "upper", "lower", "top", "bottom", "front", "rear", "inner", "outer", "horizontal", "vertical", "longitudinal" and the like indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, and are only for convenience of description and simplification of the description, but do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus, should not be construed as limiting the present invention.

Claims

1. The utility model provides a flexible frequency conversion energy-saving control system of oil beam formula beam-pumping unit based on electrical parameter which characterized in that: comprises a driving motor on the oil beam type oil pumping machine;

the frequency converter is used for adjusting the power of the driving motor;

the dead point detection module is used for detecting the position signals of the upper dead point and the lower dead point of the pumping unit;

2. The flexible variable-frequency energy-saving control system of the oil beam type pumping unit based on the electrical parameters, according to claim 1, is characterized in that: the electric parameter acquisition module acquires the electric parameters of the driving motor, such as voltage, current, active power, reactive power, apparent load power and power factors.

3. The flexible variable-frequency energy-saving control system of the oil beam type pumping unit based on the electrical parameters, according to claim 2, is characterized in that: the electrical parameter acquisition module acquires electrical parameter data 20 times per second.

4. The flexible variable-frequency energy-saving control system of the oil beam type pumping unit based on the electrical parameters, according to claim 1, is characterized in that: the dead point detection module comprises two magnetic control Hall switches and two magnets.

5. The flexible variable-frequency energy-saving control system of the oil beam type pumping unit based on the electrical parameters, according to claim 4, is characterized in that: the magnetic control Hall switches are respectively arranged at the positions of an upper dead point and a lower dead point, and the crank arm of the oil engine is provided with two magnets for detecting the correspondence of the upper dead point and the lower dead point.

6. The flexible variable-frequency energy-saving control system of the oil beam type pumping unit based on the electrical parameters, according to claim 1, is characterized in that: the control unit is a plc controller assembly.

7. The flexible variable-frequency energy-saving control system of the oil beam type pumping unit based on the electrical parameters, according to claim 1, is characterized in that: the control unit is used for controlling the frequency converter to adjust the power of the driving motor based on the received current change in the electrical parameter and the upper dead point position signal and the lower dead point position signal.