A removable horizontal well sand control pipe string fishing separation device

Abstract

The invention relates to the technical field of sand control string fishing in oil production wells, and provides a salvage separation device for sand control strings in horizontal wells. The top packer is connected to the sand control screen and the hydraulic separation device in sequence. Floating shoes are installed; the service pipe string is inserted into the hydraulic separation device, the inner wall of the working cylinder is provided with a central shaft, one end of the central shaft forms a pressure transmission hole with the inner wall of the working cylinder, the shearing piston and the support ring are fixed on the top of the central shaft, and the support ring and the left-handed split valve Thread matching; the left-handed split thread cooperates with the salvage thread, and the salvage thread is sleeved on the outer wall of the anti-rotation locking mechanism, and the end of the anti-rotation locking mechanism is installed with a joint and a guide plug; the invention uses multiple hydraulic separation devices to connect sand control screens in series When salvaging, run the service pipe string to hydraulically unlock each hydraulic separation device. After unlocking, run the butt fishing spear to realize segmental salvage, improve the success rate of salvage, save operating time and reduce labor intensity.

Description

technical field [0001] The invention relates to the technical field of sand control pipe string fishing in oil production wells, in particular to a removable sand control pipe string fishing separation device for horizontal wells. Background technique [0002] At present, most horizontal wells are completed with sand control. Affected by the effective period of sand control, the production cycle is generally short. It is often necessary to pull out the sand control string and perform sand control again. With the extension of working time, some sand filter pipes have begun to fail. Due to the role of the deflection section in horizontal wells, the lifting force and torque of the wellhead cannot be fully transmitted to the downhole horizontal section. Therefore, the conventional sand filter fishing techniques such as lifting, casing milling and undercutting cannot be implemented, resulting in the shutdown of the oil well. , affecting the performance of horizontal wells. Con...

AI Technical Summary

Problems solved by technology

Due to the role of the deflection section in the horizontal well, the lifting force and torque of the wellhead cannot be fully transmitted to the downhole horizontal section, so the conventional sand filter fishing techniques such as lifting, casing milling and undercutting cannot be implemented, resulting in the shutdown of the oil well , affecting the performance of horizontal wells

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