Underground reciprocating type water injection device

Abstract

The invention discloses an underground reciprocating type water injection device. The underground reciprocating type water injection device comprises a piston sleeve, a piston, a first one-way valve assembly and a second one-way valve assembly; the piston sleeve is fixed in a well communicating with an oil layer, a water supply port communicating with water supply equipment is formed in the upperend of the piston sleeve, and a water injection port communicating with the oil layer is formed in the lower end of the piston sleeve; the piston is in sliding fit with the piston sleeve in the pistonsleeve, the outer wall of the piston is dynamically sealed with the inner wall of the piston sleeve, and a first water flow channel communicating with the upper space of the piston sleeve located above the piston in the piston sleeve and the lower space of the piston sleeve located below the piston in the piston sleeve is formed in the piston; the first one-way valve assembly is arranged at the first water flow channel; and the second one-way valve assembly is arranged at the water injection port. According to the underground reciprocating type water injection device, underground pressurization water injection is achieved, energy loss is small when pressurized water reaches the oil layer, the pressurization effect is better, water is conveyed under normal pressure on the ground, safety ishigher, and cost is lower.

Description

Technical field[0001]The present invention relates to the field of oil exploitation, in particular to an underground reciprocating water injection device.Background technique[0002]In the process of oil exploitation, the spouting time of the oil well only accounts for a small part of the whole exploitation process. As the oil well enters the late stage of production, the oil layer pressure continues to drop. When the oil layer pressure is not enough to drive the crude oil into the wellbore, water injection is needed. Method flooding.[0003]Oilfield water injection is one of the important means to add energy to the oil layer and increase oilfield recovery in the oilfield development process. At present, oilfield water injection mainly adopts surface water injection method. After the injected water reaches the required pressure, it is sent to each water distribution room through the water separator and water pipeline. The injection water is injected into each water injection well from t...

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Problems solved by technology

[0004] When the injected water is pressurized at the water injection station and reaches the oil layer through the water distribution room and the water injection well, the injected water is transported for a long distance, and the energy loss is large. The pressurization effect is not good; and when the high-pressure injection water pressurized by the water injection station is transported in the ground water pipeline, a pressure-resistant water pipeline must be used. The pressure-resistant requirements for the selected water pipeline are high, and the cost is high. High-pressure delivery of injected water poses a great safety hazard

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