Device for expansion corrugated pipes

Abstract

The invention relates to a device for expansion corrugated pipes. The device comprises a shell with an inner cavity, a plurality of expansion cones, a slide barrel and a first pressure keeping component. The expansion cones are peripherally arranged in the wall of the shell, the slide barrel is arranged in the inner cavity, the first pressure keeping component comprises a first throwing part and a bearing seat, and the bearing seat is arranged in the slide barrel through a first shearing part and used for hermetically receiving the first throwing part. After the first throwing part falls in the bearing seat, fluid in the inner cavity drives the slide barrel to move from an initial position to an expansion position and enables the expansion cones to move from the inner side to the outer side; after the pressure of the fluid is increased to a fixed value, the fluid prompts failure of the first shearing part to enable the first throwing part and the bearing seat to separate from the device jointly. The device for the expansion corrugated pipes has the advantages that fluid circulation in pipe columns and annular spaces can be realized, cooling effects of the expansion cones can be improved in an expansion process, fatigue damage extent of the expansion cones is decreased, and service lives of the expansion cones are prolonged.

Description

technical field [0001] The invention relates to the technical field of petroleum drilling, in particular to a device for expanding bellows. Background technique [0002] During the drilling process, the tube expander mainly expands the bellows (also known as expansion bellows) into a circular tube, so as to isolate various complex formations, repair damaged casings or extend casings without reducing the size of the wellbore. length. Therefore, this technology can effectively maintain the drilling size and continuously isolate complex formations, thereby greatly reducing unnecessary risks in the drilling process. [0003] However, the expansion part of the existing tube expander for expanding the bellows is usually a spherical expansion structure or an expansion protrusion whose radial dimension is higher than that of other parts. However, since the gap between the spherical expansion structure or the expansion protrusion is narrower than that between other parts and the sl...

AI Technical Summary

Problems solved by technology

However, since the gap between the spherical expansion structure or the expansion protrusion is narrower than that between other parts and the sleeve, the spherical expansion structure and the expansion protrusion will not Both are easily blocked by the mud in the casing, making it impossible to continue down to the predetermined position, so that the bellows or the bellows string cannot be expanded at the predetermined position

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