A negative pressure setting packer

Abstract

The invention belongs to the technical field of oil exploitation equipment, and in particular relates to a negative pressure setting packer. The negative pressure setting packer includes a sealing mechanism, an anchoring mechanism is arranged at the bottom of the sealing mechanism, and a centralizer mechanism is arranged at the bottom of the anchoring mechanism; the anchoring mechanism includes a slip frame and a plurality of slips, and the slips are installed through hoops Inside the slip frame; the outer side of the slip frame on the top of the slip is provided with an annular ring, and a pushing device is arranged on the annular ring; the present invention designs the slips to be separable, and the elastic plate is opened to push the two opening plates The top ends are separated from each other, and the elastic plate can be hung on the right-angle rod, so that it is no longer necessary to press the top end of the expanded plate against the inner wall of the casing, thereby reducing the deformation of the casing and reducing the wear of the slips, and through the pushing device and the limit The cooperation of the device can clean up the foreign matters at the eversion seat, thereby preventing the slips from rubbing against the casing and improving the recovery efficiency.

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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