Sand prevention water injection packer

Abstract

The invention relates to a sand-prevention water-injection packer for injecting water into a petroleum extracting well. The technical proposal is that the packer consists of an upper joint, a central tube, a pressure cap, a slip telescopic sleeve, an anchor body, a slip, a slip shrink sleeve, a sand blocking cap, a reducer union, a tubing assembly, a sleeve, an O-shaped ring, a flushing valve, a piston, a cylinder, a self-locking tube, a self-locking sleeve, a shear pin and a lower joint which are connected in sequence. The sand blocking cap, a fluke compulsory contraction mechanism, a large flushing channel and a flushing switch are arranged in the sand-prevention water injection packer to block sand which deposits on the upper part of the packer, thereby preventing the sand from entering a cavity inside the packer, avoiding the occurrence of accidents that the water-injection packer is occasionally subjected to sand blocking and well blocking during deblocking so as to reduce accident loss. The packer can fulfill the requirements of normal water injection of a separated injection well and large-discharge reversely flushing. When disanchoring and deblocking are required, a pipe column is lifted to cut off the shear pin, a contracting claw of the slip is compulsorily pulled, pressed and contracted by the slip telescopic sleeve and the slip shrink sleeve to smoothly realize deanchoring, meanwhile, the tubing assembly of the packer is contracted and deblocked.

Description

technical field [0001] The invention relates to a downhole tool used for water injection in an oil production well, in particular to a sand control water injection packer capable of preventing sand and jamming and having a large well washing channel. Background technique [0002] In order to solve the problem of layered water injection and well flushing of water injection wells in oil production, scientific and technical personnel in the oil production industry have successively developed lift-and-set water injection packers and hydraulic-set water injection packers, and developed different types of water injection packers. Unpack the washable water injection packer. Although these water injection packers have played the role of layered water injection and unblocking and flushing of wells, due to their own structure and function limitations, coupled with pressure changes, water injection strings creep, sand production in wells, and water quality corrosion sometimes occur. T...

AI Technical Summary

Problems solved by technology

[0003] In order to overcome the problems of sand sticking in the existing water injection packer, well jamming accidents when unsealing, water injection string peristalsis caused by changes in water injection pressure, and damage to the packer due to small well washing channels and large well washing resistance Insufficient, the present invention provides a kind of sand control water injection packer, and this sand control water injection packer is provided with anchor fluke forced contraction mechanism, large flushing channel and well flushing switch, can not only ensure the safe unsealing of water injection packer, but also can Meet the needs of large displacement well washing

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