Water injection packer

Abstract

The invention discloses a water injection packer, which belongs to the field of oil field water injection. The water injection packer includes: a central pipe, an upper joint, a piston, a connecting head, a lower joint, a shear nail seat and an anti-seating shear nail, etc. The present invention forms a backwash channel through the first water inlet hole, the second water inlet hole, the first annular space, the upper second annular space and the first water outlet hole. The sealing process and the backwashing process share one piston, and the structure is simple and the backwashing process is simple. After washing, the piston moves upwards to close the backwash channel under the action of the elastic force of the elastic member, avoiding positive pressure on the oil pipe. The operation is simple, and the connection head and the lower joint are connected by pins. When sand stuck, sand buried or sleeve deformation occurs When the water injection pipe string cannot be removed, the pin can be pulled out by lifting the upper joint, thereby pulling out the upper part of the joint head of the present invention and the upper pipe string, and only repairing part of the water injection pipe string, avoiding overhaul of the water injection pipe string .

Description

technical field [0001] The invention relates to the field of oilfield water injection, in particular to a water injection packer. Background technique [0002] After the oil field is put into development, with the increase of production time, the energy of the oil layer itself will be continuously consumed, resulting in a continuous drop in the pressure of the oil layer, a large amount of degassing of the underground crude oil, an increase in the viscosity, a great reduction in the production of the oil well, and even the stop of spraying and production, resulting in underground A large amount of dead oil remains and cannot be recovered. In order to make up for the underground deficit caused by the extraction of crude oil, maintain or increase the pressure of the oil layer, achieve high and stable production in the oil field, and obtain a high recovery rate, water is injected into the oil layer by using a water injection well to supplement and maintain the pressure of the oi...

AI Technical Summary

Problems solved by technology

[0006] In order to solve the problem that the Y341 water injection packer in the prior art has a relatively complex structure and cumbersome operation, and when the water injection string cannot be lifted due to sand stuck, sand buried or casing deformation, the water injection string needs to be overhauled. The embodiment of the present invention provides a water injection packer

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