Locking and sealing device for quick butt joint of expansion cone and implementation method

Abstract

The invention discloses a locking and sealing device for quick butt joint of an expansion cone and an implementation method. The device comprises a center pipe, the expansion cone, a sealing barrel, an elastic claw and an unlocking barrel. The expansion cone is arranged on the outer periphery of the front section of the center pipe and in O-ring seal with the same. The elastic claw is arranged in the inner periphery of the rear section of the center pipe. The sealing barrel is arranged on the outer periphery of the elastic claw, the front portion of the sealing barrel is positioned between the outer periphery of the elastic claw and the inner periphery of the center pipe, and the rear portion of the sealing barrel is in O-ring seal with the elastic claw. The unlocking barrel is arranged on the outer periphery of the elastic claw in unlocking. The locking and sealing device and the implementation method have advantages that problems of time consumption and labor consumption in descending of the expansion pipe under common operating conditions are solved, and repeated alternate connection of an expansion pipe and an oil pipe is avoided; due to a locking function, connection between an inner pipe column and an outer pipe column is quickly realized through down pressure; owing to a protection effect, when the expansion cone causes blockage of a drill and an uplift force reaches a set value, the elastic claw can be broken to guarantee that the inner pipe column is smoothly lifted out of a wellhead.

Description

technical field [0001] The invention relates to an expansion tube technology, and more specifically, the invention relates to a locking and sealing device capable of quickly docking an expansion cone and an implementation method. Background technique [0002] Expandable pipe technology is a new technology that has been booming in recent years, and it can be applied in drilling, well completion, oil production and workover operations. At present, this technology is widely used, and it is mainly used in casing subsidy and casing completion in China. [0003] The existing expandable pipe used in casing subsidy and casing completion has a technological structure divided into inner and outer pipe strings. The inner pipe string includes the expansion cone and tubing, and the outer pipe string includes the firing chamber with a plug and the outer pipe string. Expansion pipe string. When going downhole, first fix the inner pipe string in the expansion pipe at the wellhead with saf...

AI Technical Summary

Problems solved by technology

[0004] In this setting method, if the number of expansion pipes is large, it is necessary to repeatedly perform the alternate connection of the inner pipe string and the outer pipe string. The obvious disadvantage is that it is time-consuming and labor-intensive.

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