Downhole oil-submerged diaphragm pump

Abstract

The invention discloses a downhole oil-submerged diaphragm pump. An electromotor rotates to drive a conic small gear and a conic large gear to rotate through a coupling and a transmission shaft. A reducing mechanism is formed by the two conic gears. After power is decelerated and converted through the reducing mechanism, an eccentric shaft is driven to drive a connecting rod plunger to do reciprocating motion, and rotating motion of the electromotor is converted into the reciprocating linear motion of the connecting rod plunger; when the connecting rod plunger does up-and-down reciprocating linear motion, hydraulic oil is pushed for pressure increase, and a diaphragm transmits pressure to a working medium of a diaphragm cavity; and a drain valve is opened when the working medium is pressed, the medium is drained, meanwhile, a liquid inlet valve assembly is closed, and suction and drainage of the working medium are achieved in a reciprocating manner in this way. Intelligent, efficient, energy-saving, safe and reliable continuous oil extraction can be achieved in a low-yield well with complex well conditions.

Description

technical field [0001] The invention belongs to power machinery, and relates to an underground submersible diaphragm pump, in particular to a rodless oil well pump used for oil well exploitation in oil fields. Background technique [0002] The rod oil production system has high manufacturing cost, high material consumption, high energy consumption in operation, low system efficiency, serious partial wear of the pipe and rod, high failure rate such as broken off, pump stuck, etc., high maintenance work intensity, and many safety hazards, etc. Problems bring a lot of trouble to the management of oil recovery in the oil field, and are the main problems in the process of mechanical oil recovery. For this reason, in recent years, some domestic universities, research institutes and related enterprises have researched and developed reciprocating submersible pumps, and carried out a series of tests on site. A total of 35 units have been tested by the factory and other units. The fi...

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Problems solved by technology

However, the main problems are wax deposition on the pump body, frequent cable damage caused by lifting and lowering the pump, high maintenance and replacement costs, easy corrosion of the plunger, and high power configuration of the motor, which cannot better meet the needs of oilfield production.

[0003] In order to solve the problems of high manufacturing cost, high material consumption, high energy consumption in operation, low system efficiency, serious partial wear of pipe rods, high failure rate such as breakage and pump stuck in the existing mechanical mining system, heavy maintenance work intensity, and many safety hazards and other problems, as well as the high manufacturing cost of the reciprocating submersible pump, the high maintenance operation cost, and the easy corrosion of the plunger.

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