Packer

Abstract

The invention provides a packer, which relates to the field of downhole layered oil production tools, and aims to realize multiple times of setting in one well entry. The technical solution mainly adopted is: the packer includes a mandrel with upper joints and lower joints at the upper and lower ends respectively, a rubber cartridge assembly, a cone, a slip assembly, a locking pin assembly and an unloader. The mandrel is used to be sleeved on the outside of the central tube. The rubber cartridge assembly is connected with the lower part of the mandrel through the lower joint. The cone, the slip assembly and the locking pin assembly are arranged in turn away from the rubber cartridge assembly and are slidably installed on the lower part of the mandrel. A curved sliding track for guiding the sliding direction of the locking pin assembly is provided at the position corresponding to the lower part of the mandrel and the locking pin assembly. Both the lower part of the mandrel and the cone are provided with pressure transmission holes. The unloader includes a first sub-unloader and a second sub-unloader detachably connected to the first sub-unloader; the first sub-unloader is connected to the upper part of the mandrel through an upper joint; the second sub-unloader adjacent to the rubber cartridge assembly The device is slidingly installed on the upper part of the mandrel.

Description

technical field [0001] The invention relates to the field of downhole layered oil recovery tools, in particular to a packer. Background technique [0002] The packer is a kind of elastic sealing element, which is used to isolate the annular space between the pipe strings of various sizes and the wellbore and between the pipe strings, and isolate the production layer to control the production (injection) fluid and protect the casing. The downhole tools are widely used in oil wells, gas wells, well completions and other operations in the petroleum industry. [0003] The work of the packer generally includes the steps of setting, anchoring and unsealing. Setting is to separate the casing and tubing through the deformation of the rubber tube. Anchoring is used to hold the packer in place. Unpacking is done to restore the deformation of the cartridge to remove the packer from the well. [0004] The current packer is set by hydraulic pressure. After the fracturing is completed,...

AI Technical Summary

Problems solved by technology

[0004] The current packer is set by hydraulic pressure. After the fracturing is completed, when it needs to be dragged to the upper layer for fracturing, the rubber tube and slips are not easy to retract, and it is easy to get stuck in the well. It is difficult to complete multiple setting in one trip

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