Casing damage well thin walled pipe patching device

Abstract

The invention discloses a casing damage well thin walled pipe patching device, and belongs to the technical field of casing pipe repair. The casing damage well thin walled pipe patching device comprises a patching pipe, an expansion cone of which the lower end is arranged inside the patching pipe, an upper sealing ring arranged at the upper end of the outer wall of the patching pipe and a lower sealing ring arranged at the lower end of the outer wall of the patching pipe, wherein a middle conical section of the expansion cone and a first conical section are matched with each other, high-pressure power liquid is injected into an inner cavity between the expansion cone and the patching pipe through a through hole formed in the center of the expansion cone, under driving of pressure difference force, the expansion cone moves to the upper portion of the patching pipe from the lower portion, the patching pipe continuously expands in the process that the expansion cone moves inside the patching pipe till the patching pipe is attached to the casing pipe, the patching pipe is permanently deformed under the effect of the expansion cone, and reinforcement of the thin walled pipe of a casing damage well and repair of loopholes are achieved. By the adoption of the upper sealing ring and the lower sealing ring, the sealing effect after the casing damage well is repaired is guaranteed, the repair cost and the repair difficulty of the casing damage well are lowered, and the well drilling cost is very obviously lowered.

Description

technical field [0001] The invention relates to the technical field of casing repair, in particular to a thin-walled pipe subsidy device for casing damaged wells. Background technique [0002] During the entire process of oil exploration and oil and gas development, due to factors such as plastic deformation of the formation, perforation, corrosion, casing wear and other factors, casing failure will eventually occur, which will greatly reduce the production of oil and gas wells and cause Production layer pollution, more serious is to cause the oil well to be scrapped. With the continuous deepening of the oilfield development process, the possibility of oil and water well casing damage will be greatly increased, resulting in a great threat. Casing damaged wells, referred to as casing damaged wells, once such problems occur, will seriously affect the normal production of the oil field and cause great harm. [0003] Specifically, on the one hand, the difficulty of exploration...

AI Technical Summary

Problems solved by technology

However, whether it is hydraulic technology suspension subsidy, explosion pressure subsidy technology or bellows subsidy technology, when repairing casing damaged wells, the repair effect is average and the repair cost is high.

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