Negative pressure setting packer

Abstract

The invention belongs to the technical field of oil exploitation equipment, and particularly relates to a negative pressure setting packer. The negative pressure setting packer comprises a sealing mechanism, wherein an anchoring mechanism is arranged at the bottom of the sealing mechanism, and a centralizing body mechanism is arranged at the bottom of the anchoring mechanism; the anchoring mechanism comprises a slip frame and a plurality of slips, and the slips are installed in the slip frame through hoop rings; and an annular ring is arranged on the outer side of the slip frame at the tops of the slipps, and a pushing device is arranged on the annular ring. According to the negative pressure setting packer, the slips are designed to be separable, an elastic plate is opened, the top ends of two opening plates are pushed to be separated from each other, the elastic plate can be hung on a right-angle rod, the top ends of the opening plates do not need to be pressed on the inner wall of a sleeve, so that the deformation of the sleeve is reduced, and the abrasion of the slips can be reduced; and through the matching effect of the pushing device and a limiting device, foreign matters at an outward turning seat can be cleaned, so that the friction between the slips and the sleeve is prevented, and the efficiency during recovery is improved.

Description

technical field [0001] The invention belongs to the technical field of oil exploitation equipment, in particular to a negative pressure setting packer. Background technique [0002] In horizontal wells, the isolation device on the upper part of the hollow oil well pump needs to be fixed in the wellbore, and the hollow plunger of the oil well pump is separated from it and moves up and down with the pipe string. When simulating oil well production, the test tool is carried out through the hollow plunger of the hollow oil well pump. Test assignment. At present, the common setting and release methods of the isolation anchor device are mainly divided into mechanical and hydraulic; the mechanical method is to realize the setting and separation by rotating, lifting and lowering the string, and this technology is easy to implement in large wellbore , but it is difficult to implement in a well with a casing with a diameter of 139.7 mm; the hydraulic method is to suppress the pressur...

AI Technical Summary

Problems solved by technology

[0003] When the negative pressure setting packer with slips (such as Y211 packer) is in use, the top of the slips deflects outwards and opens, and the slips with teeth are pressed against the inner wall of the casing preset inside the oil well In order to realize the anchoring effect, since a large pressing force is required to press the teeth into the side wall of the casing, at the same time, the pressing force of the slips will not only deform the casing, but also the difference between the two during the pressing process Friction will also wear the top of the slip, and after the top of the slip is deflected outward and opened, subsequent tedious operations are required to seal the wellhead to prevent foreign matter from falling through the wellhead to the gap between the opened slip and the slip frame. If the corner is not sealed, when the slips are retracted, foreign matter will hinder the return of the slips and affect the recovery of the packer

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