Y221 packer

Description

Principle

Set seal: after the packer is lowered into the well according to the design depth, it is lifted up – forward – lowered the string, then the reversing pin on the lower joint of the packer will be disconnected from the reversing joint, when the string is lowered, the slip, the friction body and the reversing joint remain motionless under the action of friction between the friction block and the casing, the upper joint, the central pipe and the pressure relief valve go down together to push the cone to stretch the slip and the packer is stuck on the casing, and the pressure relief valve is closed at the same time, and the weight of the upper string compresses the packer rubber cartridge to make its outer diameter larger, and the annular space of the oil jacket is sealed. Unsealing: The upper lifting string is first opened by the pressure relief valve, so that the packer is connected inside and outside, the pressure is balanced, and the upper string is continuously lifted, the upper joint, the central pipe, and the pressure relief valve go up together, the rubber cylinder is restored, the cone is raised from the Kava, and the packer is unsealed.

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