CN206376832U - Energy saving control system for beam pumping unit - Google Patents

Abstract

The utility model provides a beam-pumping unit energy-saving control system, including controller and converter, locate load sensor on the wellhead polished rod eye, locate the walking beam below displacement sensor, locate the rotational speed sensor of motor shaft output, locate the electrical parameter collection module on the beam-pumping unit. The utility model provides a beam-pumping unit energy-saving control system gives the most reasonable control method according to the actual liquid condition of going out, through stroke adjustment, take out and follow-up control within a definite time, has satisfied the control that becomes more meticulous of oil well in a stroke cycle to realize the energy saving and consumption reduction of oil well and reduce the loss of operational facilities.

Description

Energy saving control system for beam pumping unit

technical field

The utility model belongs to the technical field of digitalization of mechanical mining systems, and in particular relates to an energy-saving control system of a beam pumping unit.

Background technique

Although the rod pump oil production method of the beam pumping unit currently used has the advantages of simple structure, durability, and mature technology, it also has inherent problems such as partial wear of the rod and tube, many transmission links, and little room for system efficiency improvement. Since the load of the pumping unit is an alternating load with impact, the current driving motor of the pumping unit is mainly a three-phase asynchronous motor, which is suitable for the working condition of constant load, which causes the motor does not match the load. As a result, the motor runs under low load for a long time, unable to reach the rated efficiency range, and the energy loss of the motor is high, which affects the overall system efficiency level of the oil well.

In response to the above problems, Changqing Oilfield has developed and promoted a large number of digital pumping units, which are mainly composed of pumping unit bodies, intelligent control cabinets, sensors, balance adjustment devices, etc., which are based on conventional beam pumping units. , with functions such as automatic collection of power diagrams and electric parameter data, automatic balance adjustment, automatic adjustment of stroke times (the level of stroke times directly affects the amount of power consumption), automatic adjustment of motor speed and remote control, etc., but still cannot meet the needs of field applications needs, and lacks good adaptability to wells with low liquid volume and intermittent liquid discharge. At the same time, it is adaptively controlled according to the actual formation liquid discharge, but the motor speed control is controlled with a stroke cycle (suction cycle) as the minimum unit, while The rotational speed of each point in a stroke cycle has not been controlled and matched, and the reasonable and efficient operation of the pumping unit has not been fully realized.

Utility model content

The purpose of this utility model is to overcome the above-mentioned problems in the prior art, and achieve the goal of improving the efficiency of the machine mining system and reducing energy consumption by controlling the matching between the motor and the load at each point of each suction cycle.

For this reason, the utility model provides an energy-saving control system for a beam pumping unit, including a controller and a frequency converter, a load sensor installed on the wellhead rope hanger, a displacement sensor installed under the beam, and a motor The speed sensor at the output end of the shaft, and the electric parameter acquisition module installed on the pumping unit;

The controller includes a wellhead collector, an RTU control unit, a display module, and an operation unit, and the electric parameter acquisition module is used to obtain real-time operating state parameters of the motor of the pumping unit, and send the real-time operating state parameters to the RTU control unit The wellhead collector, display module, and operation unit of the unit are all electrically connected to the RTU control unit, and the load sensor and displacement sensor are all electrically connected to the input end of the wellhead collector, and the wellhead collector is used to collect load electrical signals and displacement electrical signals. signal, the output end of the electric reference acquisition module and the output end of the speed sensor are both connected to the input end of the RTU control unit, the output end of the RTU control unit is electrically connected to the frequency converter, and the frequency converter is electrically connected to the motor.

The output end of the rotational speed sensor is wirelessly connected with the input end of the RTU control unit.

The real-time operating state parameters include power, current value, and voltage value.

The operating unit is composed of a start button, a stop button, a reset button, a stroke adjustment knob, a manual stroke adjustment knob, a balance adjustment knob, a manual balance adjustment button, and a direction conversion knob.

The beneficial effects of the utility model are: the energy-saving control system of the beam pumping unit provided by the utility model provides the most reasonable control method according to the actual liquid discharge situation, through the stroke adjustment, interval pumping and follow-up control, It satisfies the fine control of the oil well within one stroke cycle, so as to realize the energy saving and consumption reduction of the oil well and reduce the loss of operating equipment.

Further details will be described below in conjunction with the accompanying drawings.

Description of drawings

Fig. 1 is a schematic diagram of the principle of the utility model;

Figure 2 is an indicator diagram of the oil well pump;

Fig. 3 is the initial state curve of motor power and motor speed;

Figure 4 is the target state curve.

detailed description

Example 1:

This embodiment provides a beam pumping unit energy-saving control system as shown in Figure 1, including a controller and a frequency converter, a load sensor arranged on the wellhead rope hanger, a displacement sensor arranged under the beam, The speed sensor installed at the output end of the motor shaft, and the electric parameter acquisition module installed on the pumping unit;

The controller includes a wellhead collector, an RTU control unit, a display module, and an operation unit, and the electric parameter acquisition module is used to obtain real-time operating state parameters of the motor of the pumping unit, and send the real-time operating state parameters to the RTU control unit The wellhead collector, display module, and operation unit of the unit are all electrically connected to the RTU control unit, and the load sensor and displacement sensor are all electrically connected to the input end of the wellhead collector, and the wellhead collector is used to collect load electrical signals and displacement electrical signals. signal, the output end of the electric reference acquisition module and the output end of the speed sensor are both connected to the input end of the RTU control unit, the output end of the RTU control unit is electrically connected to the frequency converter, and the frequency converter is electrically connected to the motor.

Example 2:

On the basis of Embodiment 1, this embodiment provides an energy-saving control system for a beam pumping unit, wherein the output end of the rotational speed sensor is wirelessly connected to the input end of the RTU control unit.

The real-time operating state parameters include power, current value, and voltage value.

The principle of the utility model: through the load sensor installed on the wellhead rope hanger and the displacement sensor under the beam, the load and displacement of the sucker rod in the pumping well are measured, the load and time, displacement and time curves are collected, and the light rod is obtained. The dynamometer diagram, load and displacement electrical signals are transmitted to the wellhead collector through the cable, and uploaded to the RTU control unit for calculation to obtain the dynamometer diagram of the pumping pump. The electric parameter acquisition module is installed on the pumping unit to monitor the three-phase current of the pumping unit , voltage, and motor power are collected synchronously, and the electric parameter acquisition module uploads the motor power to the RTU control unit, installs a speed sensor at the output end of the motor shaft, and collects the speed of the motor output shaft synchronously, and the data of the motor shaft speed is sent to the RTU control through the wireless transmission module The RTU control unit calculates the running and stopping time of the motor, the motor speed, the distribution of the speed ω and the distribution of the current frequency f, and sends the parameters to the frequency converter. The frequency converter controls the operation of the motor by controlling the current frequency and working time to achieve energy saving purpose of control.

Among them, the operating unit is composed of a start button, a stop button, a reset button, a stroke adjustment knob, a manual stroke adjustment knob, a balance adjustment knob, a manual balance adjustment button, and a direction conversion knob. Its function is to operate the pumping unit on site to realize functions such as adjusting stroke times, starting, stopping, and steering. The display module is to display the operating parameters and indicator diagram of the pumping unit.

Example 3:

On the basis of Embodiment 1, this embodiment provides an energy-saving control method for a beam pumping unit, comprising the following steps:

Step 1) The load sensor and the displacement sensor collect the load and displacement of the sucker rod of the pumping unit respectively, and take the displacement in one pumping cycle as the abscissa and the load as the ordinate to obtain the polished rod indicator diagram;

The load and displacement electrical signals are transmitted to the wellhead collector through the cable, and then uploaded to the RTU control unit for calculation and solution to obtain the dynamometer diagram of the oil well pump;

Step 2) The speed sensor sends the speed electrical signal to the RTU control unit, and the electric parameter acquisition module collects the real-time operating state parameters of the oil generator motor, and uploads the motor power to the RTU control unit;

Step 3) The RTU control unit judges the working conditions of the oil well according to the polished rod indicator diagram, the effective stroke obtained from the oil pump indicator diagram, the state curve of the motor speed and motor power in one suction cycle, and determines which of the following control strategies is suitable for the oil well Energy-saving control: adjust the stroke frequency and follow-up control or intermittent pumping and follow-up control, adjust the stroke frequency or start and stop the pumping unit through the operation unit, and at the same time, the RTU control unit calculates the motor speed distribution and current frequency f distribution, and sends them to the frequency converter controller to control the operation of the motor to achieve energy saving.

As shown in Figure 2, determine the closing point of the traveling valve on the downstroke and the opening point of the traveling valve. The distance between these two points is the effective stroke, which reflects the fullness of the oil well pump. From this, it can be judged whether the supply and discharge of the oil well are balanced, and thus Hedging times are adjusted.

Among them, the specific process of adjusting the stroke times is as follows: when the effective stroke obtained from the indicator diagram of the oil well pump is less than the corresponding amount of the oil well working condition, the stroke times are adjusted smaller, otherwise, the stroke times are adjusted larger, and the stroke times are adjusted by 1% to 5%. Compare the average effective stroke within 3-4 hours after adjustment with the average effective stroke within the same time period before adjustment. If the average effective stroke does not change, you can continue to reduce or increase the number of strokes until the liquid production becomes stable.

The thinning is suitable for situations where the number of strokes has reached the minimum value and cannot be adjusted further. The thinning is calculated by the RTU control unit to calculate the running and stopping time of the motor, and the energy is saved by starting and stopping the operating unit.

The specific process of the follow-up control is: the RTU control unit adjusts the motor power by changing the motor speed according to the motor power and the initial state curve of the motor speed, so that the motor power tends to be stable, and the motor speed is realized by controlling the current frequency of the frequency converter. As shown in Figure 3, the initial state curve of motor speed and power in a suction cycle, the output power of the motor is adjusted by changing the motor speed, the speed in the high power area is reduced to reduce the output power, and the speed in the low power area is increased to increase the output Power, realize the redistribution of motor output power and output torque, make the motor power tend to be stable, straight and low in absolute value, and achieve the purpose of "shaving peaks and filling valleys", that is, to achieve the target state curve (see Figure 4), which It is the core of the motor to achieve energy saving.

When the average filling factor of the pump is lower than 50% for three consecutive days (can be set), adjust the stroke times first, optimize the motor speed within one stroke cycle, and perform power follow-up control to achieve the goal of "shaving peaks and filling valleys" Purpose: If the number of strokes has reached the minimum value and the average filling factor of the pump is still lower than 50% for three consecutive days, carry out interval pumping of oil wells, determine the best interval opening time, and optimize the motor operating speed within one stroke cycle during the well opening process. Realize power follow-up control.

The collection frequency of load and time, displacement and time shall be determined according to the oilfield production and liquid flow law, and the frequency of a set of indicator map data for each oil well survey shall be determined. For low-production wells, the frequency of 10 minutes shall be adopted, and the effective work map collected in one day shall be The number is not less than 110. No less than 200 data set points shall be measured in one suction cycle. No less than 200 pieces of motor speed data are measured in one suction cycle. Realize the control matching between the motor and the load, and achieve the goal of improving the efficiency of the machine mining system and reducing energy consumption.

The RTU control unit and the electric parameter acquisition module in the utility model are all prior art, and the methods and structures not described in detail in the above embodiments belong to the common knowledge of the industry, and are not described one by one here.

The above examples are only illustrations of the utility model, and do not constitute a limitation to the protection scope of the utility model. All designs identical or similar to the utility model all belong to the protection scope of the utility model.

Claims (4)

1. A beam pumping unit energy-saving control system, characterized in that it comprises a controller and a frequency converter, a load sensor arranged on the wellhead rope hanger, a displacement sensor arranged below the beam, an output sensor arranged on the motor shaft The speed sensor at the end and the electric parameter acquisition module installed on the pumping unit; The controller includes a wellhead collector, an RTU control unit, a display module, and an operation unit, and the electric parameter acquisition module is used to obtain real-time operating state parameters of the motor of the pumping unit, and send the real-time operating state parameters to the RTU control unit unit; the wellhead collector, display module, and operating unit are all electrically connected to the RTU control unit, and the load sensor and the displacement sensor are all electrically connected to the input end of the wellhead collector, and the wellhead collector is used to collect load electrical signals and displacement For electrical signals, the output end of the electric parameter acquisition module and the output end of the rotational speed sensor are both connected to the input end of the RTU control unit, the output end of the RTU control unit is electrically connected to the frequency converter, and the frequency converter is electrically connected to the motor. 2. An energy-saving control system for a beam pumping unit according to claim 1, characterized in that: the output end of the rotational speed sensor is wirelessly connected to the input end of the RTU control unit. 3. An energy-saving control system for a beam pumping unit according to claim 1, wherein the real-time operating state parameters include power, current value, and voltage value. 4. A beam pumping unit energy-saving control system according to claim 1, characterized in that: the operating unit consists of a start button, a stop button, a reset button, a stroke adjustment knob, a manual stroke adjustment knob, It consists of a balance adjustment knob, a manual balance adjustment button, and a direction conversion knob.