Self-examination packer

Abstract

The invention provides a self-examination packer. The self-examination packer can serve as a sieve tube hanger, and can also be used for blocking bottom water in a layered bottom-sealing and top-extraction process. An examination through hole is formed in a side wall of an upper center tube of the self-examination packer; an examination piston which is used for sealing the examination through hole is arranged in the upper center tube through an examination shear pin; examination spacer rings are arranged between adjacent rubber barrels; a plurality of radial fluid through holes are formed in the periphery of each examination spacer ring; and the side wall of a core tube of each rubber barrel is provided with a second through hole which can be connected with the corresponding radial fluid through hole after the rubber barrel is compressed. After setting is finished, the examination shear pin is shorn off through liquid pressure, and pressure liquid enters a gap between the two adjacent rubber sleeves through a liquid channel so as to judge whether setting is complete or not. Moreover, the self-examination packer also comprises a midway-dropping-preventing mechanism and an elastic unsealing mechanism; the midway-dropping-preventing mechanism comprises an upper joint and a limiting pawl spring; and the elastic unsealing mechanism comprises a lower center tube and an unsealing nut.

Description

technical field [0001] The invention relates to an oil well isolation device, in particular to a self-inspection sealing packer. Background technique [0002] In the process of oilfield development, mechanical sand control is required for unconsolidated sandstone reservoirs with serious sand production. In this process, Y455 packer can be used as a screen hanger. The main purpose is to hang sand control screens and seal sand control The annular space of the screen and casing prevents the formation fluid from carrying formation sand from the annular space of the sand control screen and casing into the wellbore, resulting in sand production. Existing screen hangers do not have self-sealing function, and cannot be found in time after setting failure, resulting in poor sand control effect in the later stage. In the process of sealing the bottom and top mining in layered mining, the Y445 packer can also be used to seal the layer, but the existing Y445 packer cannot be inspected ...

AI Technical Summary

Problems solved by technology

[0004] The purpose of the present invention is to provide a self-testing packer, which solves the problem of uncertain whether the packer is successfully set after setting, and the sealing method is easy to operate, high in efficiency, low in cost and ideal in effect

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