Three-pipe linear motor oil well pump

Abstract

A three-tube type linear motor oil well pump comprises an outer tube, wherein the upper end of the outer tube is connected with a sand settling tube through an upper coupling, the lower end of the outer tube is connected with an oil inlet screen tube through a lower coupling, the upper end of the sand settling tube is connected with an oil tube coupling, and a middle oil outlet tube is arranged in the sand settling tube. A filter tube I, an upper pump cylinder and a lower pump cylinder are sequentially arranged in the outer tube from top to bottom. A filter tube II is arranged in the filter tube I. An upper plunger and a lower plunger are sequentially arranged in the upper pump cylinder from top to bottom. An upper plunger and a lower plunger are sequentially arranged in the lower pump cylinder from top to bottom. The bottom end of the lower plunger is connected with a motor rotor arranged in the oil inlet screen tube through a coupling head. A motor stator is arranged on the outer side of the motor rotor. A check valve is arranged at the communicating position between the top end of the filter tube I and the middle oil outlet tube. An oil outlet valve is arranged in the upper pump cylinder and located above the upper plunger, an upper traveling valve is arranged in the upper end of the upper plunger, and a lower traveling valve is arranged at the connecting position between the top end of the lower plunger and the upper plunger. The three-tube type linear motor oil well pump has the advantages that the sand prevention ability is high, loads are balanced, the service life of the linear motor pump is prolonged, and the demand for oil extraction through a linear motor oil extraction method can be met.

Description

technical field [0001] The invention relates to a three-pipe linear motor oil well pump, which is suitable for oil production in oil wells using the linear motor oil recovery method to exploit crude oil, can effectively balance the load of the motor, has strong sand control ability, and greatly improves the service life of the linear motor. Background technique [0002] At present, the linear motor oil well pump is favored by oil fields as a new type of oil recovery equipment. It is a power device that directly converts electrical energy into linear motion mechanical energy without any intermediate conversion mechanism. Using a linear motor as the power equipment of the oil pump can eliminate the pumping unit and the sucker rod string in the conventional rod pump oil production system, simplify the transmission mode, avoid the eccentric wear of the sucker rod string and the tubing string, and reduce the loss of transmission energy. Improve pump efficiency and monitor downho...

AI Technical Summary

Problems solved by technology

[0003] 1. When the pump is stopped for maintenance, the sand grains contained in the crude oil in the upper oil pipe are deposited into the linear motor pump, which is very prone to sand jamming and sand burial, which will cause the linear motor pump to be strained, blocked or even scrapped.

[0004] 2. The existing linear motor oil well pump basically does work for a single stroke, and the work is unbalanced during the up and down strokes, which will cause large changes in the motor load and affect the life of the motor, or the combined plunger will deform due to alternating loads. Consequences such as tripping

[0005] 3. During the pumping process, the sand particles in the crude oil will deposit and block the oil outlet, causing the plunger to fail to discharge oil when it goes down, thereby increasing the down resistance, making it difficult for the plunger to go down, and even causing the plunger to trip in severe cases. damaged motor

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