A control method for an oil production device of a downhole linear motor double-acting reciprocating pump

Abstract

The invention relates to the field of oil field production and provides a control method of an underground linear motor difunctional reciprocating oil-well pump oil production device. The maximum stroke L0 is determined by tracking collision downwards and upwards, then a movable component is set to be operated within the maximum stroke, and the actual operation stroke is L. If collision occurs when the movable component operates downwards for the first time after tracking, then it is judged that a fixed one-way valve of an oil-well pump is severely leaked, a machine is shut down, and an alarm is given out; and if collision does not occur, the equipment operates in a reciprocating mode according to the set cycle, the set stroke and the set interval. In the period, if upward collision or downward collision is detected and the collision frequency is smaller than N0, the downward stroke or the upward stroke next time is increased by delta S; and if the continuous upward collision frequency or the continuous downward collision frequency reaches N0, upward or downward abnormal judgment treatment is conducted. By the adoption of the control method, the working stress of a system can be reduced through motion control under the condition that detection devices such as sensors cannot be installed, the motion stability is improved, thus, the failure probability is decreased, and the service life of the system is prolonged.

Description

technical field [0001] The invention relates to the field of oil production in oil fields, in particular to a control method for an oil production device of an underground linear motor double-acting reciprocating oil pump. Background technique [0002] The downhole linear motor reciprocating pump oil production system mainly includes three parts: linear motor, double-acting reciprocating pump and control system. Since the oil production equipment works deep in the oil well, the environmental conditions are harsh, and detection devices such as position sensors cannot be installed, so its motion control generally adopts an open-loop control method. However, it is difficult to detect the downhole equipment with the open-loop control method. Therefore, the operation of the linear motor is prone to unstable operation, and collisions between moving parts (motor mover and oil pump plunger) and fixed parts, etc., resulting in unstable operation. Vibration and shock will damage the ...

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Problems solved by technology

[0003] The purpose of the present invention is to overcome the deficiencies in the prior art, and to provide a control method for a downhole linear motor double-acting reciprocating oil pump oil production device. The working characteristics and structural characteristics of the system reduce the working stress of the system by means of motion control, improve motion stability, reduce the probability of failure, and increase its service life

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