Integral submersible direct-driven screw pump

Abstract

The invention relates to an integral submersible direct-driven screw pump. The integral submersible direct-driven screw pump comprises a protector, a submersible motor and a screw pump; an oil transmission sleeve I and an oil transmission sleeve II are arranged in the protector; the upper end of the oil transmission sleeve I is connected with an oil pipe upper coupling; a base of the protector is fixedly connected with a motor upper joint of the submersible motor; the oil transmission sleeve II of the protector is connected with a motor rotor of the submersible motor; the motor rotor is a hollow pipe; a permanent magnet fixedly sleeves the motor rotor; a motor stator is arranged on the outer layer of the permanent magnet; a second thrust ball bearing is arranged between the permanent magnet and a second sealing base; a rubber bushing is arranged in the motor rotor; a screw rod and the rubber bushing are in interference fit; the motor rotor is a screw pump body; the screw rod is fixed on an oil inlet base through a flexible shaft; an oil inlet hole is formed in the oil inlet base; and the oil inlet base is connected with a pump body lower coupling. The submersible motor and the screw pump adopt the embedded design to realize motor-pump integration, so that the total length is greatly reduced, and the well type adaptability is improved.

Description

technical field [0001] The invention relates to the technical field of mechanical oil extraction equipment in the petroleum industry, in particular to an integrated submersible direct-drive screw pump. Background technique [0002] With the gradual deepening of oilfield development, the exploitation of unconventional oil and gas reservoirs has become the main direction of oilfield exploitation. However, these oil and gas reservoirs generally have high viscosity, sandy content, and low production. In such unconventional and complex oil and gas reservoirs, the traditional rod pumping system will have accidents such as pump jamming, wear and tear, and even breakage, resulting in frequent oil well operations and high oil recovery costs. Therefore, rodless pumping equipment such as screw pumps began to rise gradually, and were more and more widely used in oil recovery in oil fields. [0003] As a rodless pumping equipment, the submersible direct drive screw pump can be well app...

AI Technical Summary

Problems solved by technology

[0006] An object of the present invention is to provide an integrated submersible direct-drive screw pump, which is used in the existing submersible direct-drive screw pump system because of its long overall length and is difficult to pass through small For directional wells and horizontal wells with a radius of curvature, the concentricity is not easy to guarantee, the motor heating problem is serious, the mechanical structure is complex, and the production cost is high.

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