Packer with low-pressure setting and low-tension unsealing

Abstract

The invention discloses a packer with low-pressure setting and low-tension unsealing. For a setting mechanism, an upper outer center pipe is connected with a ball locking seat in a threaded mode, theupper outer center pipe is connected with a lower outer center pipe in a threaded mode, an upper piston sleeve is arranged on the outer part of the upper outer center pipe in a sleeving mode, an upperouter sleeve is connected with a limiting sleeve in a threaded mode, and the upper outer sleeve and the limiting sleeve are arranged on the upper parts of the upper outer center pipe and the lower outer center pipe in a sleeving mode; an upper rubber cylinder, an upper separating ring, a middle rubber cylinder, a lower separating ring, a lower rubber cylinder and a lower pressing ring are arranged on the outer part of the lower outer center pipe; an annular groove is formed in the outer part of the upper outer center pipe, and the radian of the groove is the same as the radian of an upper steel ball; an annular hole is formed in the ball locking seat, and the center of the annular hole of the ball locking seat and the center of the annular groove of the upper outer center pipe are coincided; three quarters of the upper steel ball are placed in the annular hole of the ball locking seat, and the other quarter of the upper steel ball is placed in the annular groove of the upper outer center pipe; an upper center pipe is in locking fit with the ball locking seat through the upper steel ball; and a disjointing sleeve is arranged on the outer parts of the upper center pipe and the balllocking seat in a sleeving mode, and the disjointing sleeve and the ball locking seat are fixed with disjointing pins. The problem of well blocking due to the facts that for an existing packer, a stage-by-stage unsealing mechanism and an unsealing space are not located in a closed cavity and rubber cylinders cannot be completely recycled during unsealing is solved.

Description

technical field [0001] The invention relates to a water injection packer, in particular to a low-pressure setting and low-tension unsealing packer, which belongs to the technical field of oil field exploitation equipment. Background technique [0002] Shallow wells in oilfields use more than four sets of packers for layered water injection operations, which require low setting pressure and small unsealing load. It is necessary to ensure the water injection process requirements, as well as to ensure that the packers are firmly set and unsealed thoroughly to achieve safety. Environmental protection work requirements. At present, the main disadvantage of the packer used in shallow well water injection operations in the oil field is that the rubber cartridge gets stuck in the well when the packer is unsealed, and the unsealed pulling force is large. When the hoisting string cuts the unsealing pin, the rubber tube cannot be fully recovered and remains in a state of swelling and ...

AI Technical Summary

Problems solved by technology

[0003] The invention discloses a low-pressure setting and low-tension unsealing packer, which has the function of realizing low-pressure setting and low-tension unsealing, and solves the problem that the existing packer has a step-by-step unsealing mechanism and the unsealing space is not in a closed cavity. The rubber cartridge cannot be recycled when unsealing, causing the problem of stuck well

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