Removable type horizontal well sand prevention pipe column salvaging and separation device

Abstract

The invention relates to the technical field of oil exploitation well sand prevention pipe column salvaging, and provides a removable type horizontal well sand prevention pipe column salvaging and separation device. A top packer is sequentially connected with sand prevention screen pipes and a plurality of hydraulic separation device, and a float shoe is mounted at the end of the sand prevention screen pipe at the tail end; and a service pipe column is inserted into a hydraulic separation device, a center shaft is arranged on the inner wall of a working barrel, one end of the center shaft and the inner wall of the working barrel form a pressure transmission hole, a shearing piston and a supporting ring are fixed to the top of the center shaft, and the supporting ring is matched with left-handed sectioning threads. A left-hand sectioning thread is matched with a salvaging thread, the salvaging thread is connected to the outer wall of an anti-rotation locking mechanism in a sleeving mode, and an upper connector and a guide plug are installed at the end of the anti-rotation locking mechanism. According to the removable type horizontal well sand prevention pipe column salvaging and separation device, the multiple hydraulic separation devices are connected with the sand prevention screen pipe in series, the service pipe column is tripped in during salvaging to conduct hydraulic unlocking on the hydraulic separation devices, buckling salvaging spears are tripped in after unlocking, so that segmented salvaging is achieved, the salvaging success rate is increased, the operation time is saved, and the labor intensity is reduced.

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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