Rodless oil extraction system driven by underground rotation motor

Abstract

The invention relates to a rodless oil extraction system driven by an underground rotation motor and applied to the technical field of oil extraction in oil fields. The rodless oil extraction system comprises a pressure balance device, a three-phase asynchronous rotation motor, a mechanical transformation mechanism, a lower cylinder tube and a lower stopper. A balance piston and an upper spacing ring are arranged in an upper cylinder tube, a ventilation hole is arranged on the wall of the upper cylinder tube, the lower end of the upper cylinder tube is fixedly provided with the three-phase asynchronous rotation motor, the center of a motor shaft is provided with an axial through hole, the lower end of the three-phase asynchronous rotation motor is fixedly provided with the lower cylinder tube and the lower stopper, the mechanical transformation mechanism is arranged in the lower cylinder tube and comprises a shaft coupling, a lead screw and a nut, the upper end of the shaft coupling is connected with the motor shaft, the lower end of the shaft coupling is connected with the nut, and the lower end of the lead screw penetrates through a center hole of the lower stopper. The motor shaft drives the nut to rotate by the shaft coupling, the lead screw makes a linear reciprocating motion under the drive of the nut, and an oil pumping pump is driven to realize lifting oil pumping. The rodless oil extraction system driven by the underground rotation motor solves the problem of lopsided wear of a rod pipe existing in a directional well, enhances the efficiency of the oil pumping pump and lowers the energy consumption.

Description

technical field [0001] The invention relates to the technical field of oil recovery in oil fields, in particular to rodless oil recovery, and is a rodless oil recovery system driven by a downhole rotary motor. It is suitable for oil production wells where directional wells and inclined wells are prone to eccentric wear of rods and tubes. Background technique [0002] At present, in mechanical oil recovery, the rod pump lifting system of pumping units occupies a dominant position due to its simple structure, mature technology, reliability and durability, and wide adaptability, accounting for about 90% of the number of artificially lifted wells. But there are also some deficiencies: first, there is an inherent reciprocating eccentric wear problem between the sucker rod and the oil pipe. This problem becomes more and more serious as the water cut in the oil field rises, the pump hangs deepen and the number of special trajectory wells increases. Secondly, too many transmission...

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Problems solved by technology

But there are also some shortcomings: First, there is an inherent reciprocating eccentric wear problem between the sucker rod and the oil pipe

Secondly, too many transmission links, and the need to overcome the weight and elastic deformation of the sucker rod itself will consume a part of power, which will eventually lead to a decrease in the efficiency of the rod pump system of the pumping unit, increase the maintenance workload, and increase the cost of crude oil extraction

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