Inner screw driving downhole oil pumping device

Abstract

The invention relates to an oil pumping machine, in particular to an inner screw driving downhole oil pumping device. The inner screw driving downhole oil pumping device mainly comprises an inverted double-acting plunger pump, an inner screw and a reversing block. A motor outputs the rotation power, after speed reduction is conducted through a speed reducer, the inner screw is driven to rotate inone direction, a left-handed rotation spiral groove and a right-handed rotation spiral groove are formed in the inner surface of the inner screw, automatic reversing can be achieved, the reversing block moves in the spiral grooves in a rolling and sliding manner, a connecting rod is fixed to the reversing block, the one-direction rotation movement of the inner screw is converted into the up-down reciprocating linear movement, and crude oil is elevated to the ground. According to the inner screw driving downhole oil pumping device, one-direction rotation of the motor is directly converted intothe reciprocating linear movement for oil pumping, rodless oil pumping is achieved, the inner screw driving downhole oil pumping device is simple in structure, and the inner screw structure is particularly suitable for deep well and small well hole oil extraction; and the elevating efficiency is improved in the transmission manner of rolling and sliding of the reversing block. The purposes of energy saving and consumption reducing are truly achieved.

Description

technical field [0001] The invention relates to an oil pumping unit for an oil field, in particular to an underground sucker rod-less mechanical lifting and reversing pumping device. Background technique [0002] There are three main modes of oil production in oilfields: surface power-driven oil recovery, downhole power-driven oil recovery, and self-flowing well oil recovery. At present, most of the oilfields have entered the middle and late stage of production, and the production of self-flowing wells can no longer adapt to the current production environment. Surface power-driven oil production includes rod pumps for pumping units and ground-driven screw pumps. They are both rod pump oil production methods with simple structures and easy manufacturing. They currently dominate, accounting for about 90% of the number of artificial lift wells. However, when working in this way, it is necessary to overcome the self-weight of the sucker rod and the friction between the sucker r...

AI Technical Summary

Problems solved by technology

[0004] Aiming at the problems existing in the current ground power-driven oil production method, combined with the downhole power-driven oil production method, the present invention provides an internal screw driven downhole oil pumping device to solve the problems of high energy consumption and low efficiency of the pumping unit in the prior art

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