Energy storage linear motor capsule pump

Abstract

The invention relates to an energy storage type linear motor capsule pump. According to the technical scheme, an eccentric oil inlet valve assembly and an upper capsule pump are arranged inside an upper shell, a gap between the eccentric oil inlet valve assembly and the upper shell is a hydraulic oil channel, the upper end of the hydraulic oil channel is communicated with the inside of the upper capsule pump, and the lower end of the hydraulic oil channel is communicated with an upper cylinder body; the eccentric oil inlet valve assembly is placed at the eccentric position of an inner cavity of the upper shell, a well fluid channel is formed between the upper capsule pump and the upper shell, the upper end of the well fluid channel is communicated with an oil pipe connected to the upper end of the upper shell through an oil outlet valve, and the lower end of the well fluid channel is communicated with an outlet in the upper end of an oil inlet valve; a rotor is used for driving a plunger inside the cylinder body to make up-down reciprocating motion and pushing the hydraulic oil to drive a capsule of the upper capsule pump to expand and shrink, so that well fluid is lifted to the ground. The energy storage type linear motor capsule pump has the advantages that the upper capsule pump stops the well fluid from making contact with a linear motor and a kinematic pair inside a hydraulic cylinder, so that the service life of the pump is prolonged; due to the fact that an energy storage bag is additionally arranged, the working efficiency of the motor can be improved.

Description

Technical field [0001] The invention relates to an oilfield downhole mechanical oil extraction device, in particular to an energy storage type linear motor capsule pump, which is suitable for general conventional wells and special oil wells, inclined wells and horizontal wells containing sand particles and corrosive well fluids. Background technique [0002] At present, rod pumping equipment occupies a large proportion of the oil production system in oil production. The current maximum efficiency target value of rod pumping system is less than 40%, and the measured value is only about 20%. The traditional ground rotating motor rod pumping method has many ground and downhole equipment and large energy loss. The alternating load of the downhole sucker rod and pump working in conjunction with the pumping unit causes unstable operation of the ground system and aggravates the power system. Reactive power consumption leads to inefficient operation of the oil production system. In addit...

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Problems solved by technology

However, since the downward rod occupies the cross-sectional area of ​​the piston, the displacement of the pump is reduced, and the counterweight part needs to occupy a longer downhole space, so it is difficult to keep the sealing box sealed.

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