Flexible self-sealed anti-humeral-protrusion compression packer

Abstract

The invention discloses a flexible self-sealed anti-humeral-protrusion compression packer and solves the problem that existing packers are low in pressure resistance. The packer specifically comprises a central pipe, a transmission cylinder, a piston sleeve and a compression plug, a plurality of clamping claws are uniformly arranged at the lower end of the transmission cylinder circumferentially, a boss is arranged on the central pipe below the transmission cylinder, a spring is arranged between the transmission cylinder and the boss of the central pipe, a pressure-carrying rubber sleeve, a middle rubber sleeve and a pressure-applying rubber sleeve sequentially sleeve the central pipe below the boss, a shoulder is arranged outside the boss of the central pipe, a protecting cover is placed between the shoulder and the pressure-carrying rubber sleeve, the piston sleeve sleeves outside the central pipe below the pressure-applying rubber sleeve, and an annular cavity along the circumferential direction of a base of the middle rubber sleeve is arranged in the middle rubber sleeve and filled with liquid, a conical portion of the compression plug is inserted into a lower port of the pressure-applying rubber sleeve, and a plurality of annular runners and longitudinal runners are arranged on the surface of a base of the compression plug. Due to joint action of the above structure, pressure resistance of the packer is improved, and needs of deep-well fracturing and large-scale joint net fracturing are met.

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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