A method for automatic control of pumping well

Abstract

The invention provides an automatic control method for pumping wells, and relates to the technical field of oil recovery in oil fields. The method includes: collecting electrical parameter data and performing noise reduction processing; finding the optimal stroke times of the pumping unit at present; calculating the electrical power through the measured current, voltage, and power factor, and calculating the eigenvalues ​​of the electrical parameters and the electrical power data; The value of the pumping unit is used to judge the pumping time of the pumping well, and the pumping unit is automatically controlled in real time. Through the above characteristic values, three emergency faults of the pumping well, such as belt breakage, plunger stuck, and sucker rod disconnection, can be diagnosed to realize emergency faults. Shutdown function and alarm; the control method of the present invention also includes the automatic intermittent pumping control of low-yield and high-consumption oil wells, automatically finds the best well shutdown time and oil well operation time, and provides a reference interval pumping system for the oilfield site; The automatic control method for pumping wells of the invention can realize the purpose of stabilizing production and reducing consumption in an oil field.

Description

technical field [0001] The invention relates to the technical field of oil recovery in oil fields, in particular to an automatic control method for pumping wells. Background technique [0002] In the process of oil field production, due to different formation fluid supply capabilities, the fluid production capabilities of the pumping wells are also different, so different pumping parameters need to be set for different pumping wells to achieve the same pumping times and fluid supply capabilities. The matching effect can not only ensure the liquid production volume, but also reduce energy consumption and improve economic benefits. Traditional pumping unit parameter adjustment is generally carried out by measuring the dynamometer diagram: use the ground dynamometer diagram to calculate the downhole pump dynamism diagram, and calculate the fluid production through the pump dynamometer diagram, and then adjust the parameters according to the fluid production volume; calculate th...

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Problems solved by technology

In this process, it is necessary to measure the dynamometer diagram. The real-time acquisition of the dynamometer diagram by wire requires the installation of displacement sensors and load sensors, and it is necessary to lay cables on the pumping unit, which is inconvenient to install and difficult to maintain. The wireless real-time collection of the dynamometer diagram requires unstable transmission. , and the closed-loop control has poor real-time performance

At present, many oilfield sites use frequency converters to adjust the speed of motors to adjust the stroke times of pumping units. The electrical parameters before the frequency converter, the active power and the suspension point load, can establish a close relationship through torque balance, so the electrical parameters can reflect the underground work. However, sensorless automatic control has never been realized by only using electrical parameters.

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