Small unsealing force packer

Abstract

The invention relates to a small unsealing force packer. The small unsealing force packer comprises an upper joint, a central pipe, an upper outer pipe, a lower outer pipe, a well flushing piston seat, an upper piston, a well flushing piston sleeve, a rubber cylinder assembly, and a short joint, and the small unsealing force packer is characterized in that a one-way exhaust valve is assembled between an exhaust hole of a pressure bearing joint and the lower outer pipe, a setting piston is installed on the lower outer pipe, fixed by a setting shear pin, and unsealed to sleeve a circlip hook andlocked to a circlip hook body, an unsealed shear pin is screwed on the circlip hook for fixation, and a circlip is installed on the circlip hook. The lower part of a lower joint is connected with theshort joint by a forced unsealed shear pin, and the outer side of the lower part of the lower joint is provided with a sheath which is fixed by a sheath pin. According to the small unsealing force packer, a forced unsealing structure is arranged at the lower short joint portion; and the unsealed shear pin does not bear the rebound force of the rubber cylinder, the size of the unsealed shear pin is reduced, the strength of the unsealed shear pin is reduced, and the packer can be unsealed with very low unsealing force. After being set, the packer can be locked in one way to ensure that the packer is set tightly and reliably.

Description

technical field [0001] The invention belongs to a water injection well machine for oil fields, in particular to a small unsealing force packer. By combining with other tools to form a pipe string, it can carry out technological projects such as layered water injection, layered oil recovery, and layered water shutoff. Background technique [0002] At present, most domestic oil fields have entered the middle and late stages of development. With the increase of production time, the energy of the oil layer itself will be continuously consumed, resulting in a continuous drop in oil layer pressure and a significant reduction in oil well production. In order to achieve high and stable production in the oil field due to the underground deficit, water injection must be carried out in the oil field. Water injection in the oil field is one of the important means to replenish energy to the formation and improve oil recovery in the process of oil field development. The level of water inj...

AI Technical Summary

Problems solved by technology

[0003] The purpose of the present invention is to provide a packer with a small unsealing force, which has a low force Unsealing feature, when unsealing, multi-stage series connection can be unblocked at the same time, preventing the problem that conventional water injection packers cannot be unsealed smoothly by multi-stage series connection in the past, and ensuring the smooth progress of the later unsealing operation of multi-stage layered water injection wells

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