Rubber cartridges for packers and packers

Abstract

The invention relates to a rubber cartridge for a packer and a packer. The rubber sleeve used for the packer includes an elastic cylinder body, a rigid support member wrapped on the circumferential side wall of the cylinder body, and the support member makes the cylinder body form a plurality of spaced expansion regions, wherein, along the cylinder body By axially applying pressure to the end of the barrel, the multiple expansion zones are capable of expanding radially outward independently of each other. A packer includes a rubber cartridge for the packer. The rubber cartridge of the invention is suitable for operations such as drilling and completion of wells, has a simple structure, is applicable to a wide range of well diameters, and can significantly improve the safety and sealing reliability of tools.

Description

technical field [0001] The invention relates to a downhole operation tool in the field of oil drilling and completion, in particular to a packer. Background technique [0002] The rubber cartridge is the main component of the packer, and its function is to seal the annulus in the well. The rubber cartridge is wrapped around the packer. When the packer is in use, the packer is threaded between two casings and run into the designated position together with the casings. When setting, apply pressure to the end of the rubber tube outside the packer, the rubber tube compresses and expands, and its outer wall fits closely with the well wall to realize the setting seal. A closed annular space can be formed between the two set packers, and those skilled in the art can perform downhole operations such as production, testing, water injection, acidizing and fracturing in the closed annular space. [0003] In the prior art, common rubber cartridges combined into a packer include a sing...

AI Technical Summary

Problems solved by technology

The length of a single rubber cylinder is generally short, so the effective isolation length of the packer using a single rubber cylinder is relatively short, and it is difficult to seal off a large annulus

The extended single rubber tube is prone to wrinkles during setting, which cannot provide sufficient contact stress with the well wall and casing, and may easily lead to seal failure

A packer with multiple rubber cartridges can increase the effective sealing length, but since the compressive force is transmitted between the rubber cartridges through the isolation ring, this structure is prone to loss of compression force due to friction or misalignment between the isolation ring and the rubber cartridge, and cannot Ensure the same contact stress between all rubber sleeves, casing and well wall

During the process of running into the well, there are risks such as overturning and falling off between multiple rubber tubes, which will cause downhole operation failure and affect other operations.

Moreover, it is easy to squeeze between multiple rubber cartridges, which will cause the rubber cartridges to be sealed in advance

Therefore, none of the packers using single or multiple rubber cartridges in the prior art can effectively seal off the large annulus

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