A flexible self-sealing anti-shoulder compression packer

Abstract

The invention discloses a flexible self-sealing anti-shoulder compression packer, which solves the problem of low pressure resistance of the existing packer. It specifically includes a central tube, a transmission cylinder, a piston sleeve, and a compression plug. The lower end of the transmission cylinder is provided with a number of claws along the circumference, and the center tube below the transmission cylinder is provided with a boss. There is a spring between them, and the central tube under the boss is successively covered with a pressure-bearing rubber tube, a middle rubber tube and a pressure rubber tube. Cover, the central tube under the pressure rubber cylinder is covered with a piston sleeve, and the middle rubber cylinder is provided with an annular cavity along the circumference of its base, and the annular cavity is filled with liquid; the tapered part of the compression plug is inserted into the pressure In the lower port of the rubber cartridge, several annular flow channels and longitudinal flow channels are arranged on the surface of the base body of the compression plug. The above-mentioned structures of the present invention work together to improve the pressure resistance of the packer and meet the requirements of deep well fracturing and large-scale fracture network fracturing.

Description

technical field [0001] The invention relates to a packer used for separating formations in oil field water injection, water shutoff and fracturing operations. Background technique [0002] Commonly used compression packer components mainly include central pipe, rubber cartridge group (including one middle rubber cartridge and two side rubber cartridges), three-stage piston sleeve, etc. The packer is connected to the downhole pipe string through threads, After descending to the predetermined well depth, the surface pump unit pumps the liquid into the pipe string, and the fluid enters the piston sleeve through the hole on the center pipe to make it go up. The annular gap between the inner walls of the tube is plugged. The greater the fluid pressure, the greater the contact pressure between the rubber sleeve and the casing and the central pipe. When the contact pressure is higher than the fluid pressure, the packer will be sealed, and the fluid will enter the formation space s...

AI Technical Summary

Problems solved by technology

However, as the pressure increased, the shoulder pads of the rubber tube turned over and were seriously damaged, causing the gap between the rubber tube and the shoulder pads to peel off and stabbing the rubber tube

This also reflects that the currently used shoulder guards can play a certain protective role under low pressure conditions, but with the increase of pressure, ordinary anti-outburst devices can no longer meet the needs of underground operations. Therefore, the high-pressure anti-outburst device research imperative

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