Intelligent intermittent pumping positioning start-stop method for pumping unit

Abstract

The invention discloses an intelligent intermittent pumping positioning start-stop method of a pumping unit. The method comprises the following steps of S1, constructing an intermittent pumping positioning start-stop system of the pumping unit; S2, setting a rotation angular displacement fuzzy interval of a walking beam of the pumping unit when the oil pumping unit is positioned and stopped; S3, collecting the working fluid level depth, and drawing a real-time submergence curve; S4, judging whether the pumping unit is in shutdown preparation or not; S5, collecting the rotation angle of the walking beam of the pumping unit and monitoring the operation state of a horse head; S6, controlling the pumping unit to stop by a second microcontroller; S7, judging whether the pumping unit is started or not; and S8, controlling the pumping unit to be started by the second microcontroller, and cycling the step 3 until oil pumping is finished. According to the method, an angular displacement sensor collects the rotation angle of the walking beam of the pumping unit and recognizes the up-down operation state of the horse head, a working fluid level collecting mechanism directly collects the oil well fluid level depth and transmits the oil well fluid level depth to the intermittent pumping intelligent control mechanism, the oil well fluid level depth is compared with the oil pump depth stored in a storage of the intermittent pumping intelligent control mechanism, in the intermittent oil pumping process, the horse head stopping position is effectively positioned, and intermittent oil pumping is reliable.

Description

technical field [0001] The invention belongs to the technical field of positioning start-stop of an oil pumping unit, and in particular relates to an intelligent interval pumping start-stop method for positioning. Background technique [0002] At present, the reserves of medium and low permeability reservoirs in my country's proven oil reservoirs are as high as 60%, and many conventional oil fields have gradually entered the middle and late stages of development. During the production process, insufficient formation pressure, serious shortage of fluid supply, intermittent oil production, and production This phenomenon not only causes mechanical loss to the pumping unit equipment, accelerates the aging of the equipment, but also causes a lot of waste of electric energy, and even leads to more serious pumping due to the liquid hammer phenomenon. Accidents such as oil rod breakage. Therefore, it is very important to find out a way of energy-saving extraction to increase the effi...

AI Technical Summary

Problems solved by technology

This method does not have a clear grasp of the well shut-in time. If the well shut-in time is too long, the production will be reduced, thereby reducing the production efficiency of the oilfield.

In addition, too long shut-in time will cause the viscosity of crude oil to increase, and the risk of sucker rod breakage will be easily caused due to excessive friction when starting up again.

If the well opening time is too long, it will cause air pumping and liquid hammer phenomenon, resulting in waste of electric energy and increasing equipment loss. If the well opening time is too short, it will cause low production and reduce benefits

Although this fixed-time interval pumping system is convenient for oilfield management, for oil wells with different well conditions, the rise time and fall time of the annular liquid level are different, which also loses the meaning of interval pumping

In addition, not all the donkey heads of the pumping units in the oil field are suitable to stop at the bottom dead center position, and there is currently a lack of a control method that can self-adaptively position the start and stop of the pumping unit

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