Oil field underground packer

Abstract

The invention relates to an oil field underground packer, and relates to the technical field of oil field underground tools. The oil field underground packer comprises an upper connector, a central pipe, a liner pipe, a rubber sleeve component, an upper baffle ring, a lower baffle ring, a setting mechanism and a lower connector, wherein the upper end and the lower end of the central pipe are respectively in threaded connection with the upper connector and the lower connector; the liner pipe slidably sleeves the outer side of the central pipe; the rubber sleeve component sleeves the outer side of the liner pipe; an upper outer sleeve is in threaded connection with the outer side of the upper part of the upper baffle ring of a rubber sleeve; the upper outer sleeve is in sliding sealing fit with the upper connector; a snap spring sleeve is in threaded connection with the lower end of the lower baffle ring. annular spaces are reserved between the lower baffle ring and the central pipe and between the lower baffle ring and the central pipe; and snap spring claws, unlocking sleeves and unsealing mechanisms are arranged in the annular spaces. The invention provides the oil field underground packer capable of being set and unset repeatedly, which has the two advantages of good packing effect and large well washing channel section.

Description

technical field [0001] The invention belongs to the technical field of oilfield downhole tools, in particular to an oilfield downhole packer. Background technique [0002] Layered water injection means that a packer is lowered into the water injection well to separate the oil layers with large differences, and then the water distribution device is used to distribute water in layers, so that the water injection volume of the high permeability layer can be controlled, and the water injection of the middle and low permeability oil layers can be obtained. Enhanced, a water injection method that enables all types of oil layers to play a role. [0003] In order to ensure the long-term and efficient water injection of the layered water injection string, it is necessary to wash the well regularly to remove the impurities in the formation; therefore, the success of the well washing is the key factor for the smooth progress of the layered water injection. [0004] Commonly used water...

AI Technical Summary

Problems solved by technology

The advantage of this packer is: high setting quality, good sealing effect, and can well realize layered water injection; the disadvantage is: the cross-sectional area of ​​the well flushing channel (the gap between the liner and the center pipe is about 1 / 4 of the empty cross-sectional area) is small, sand stuck accidents are prone to occur, and the success rate of well cleaning is low

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