Corrugated pipe expansion tool

Abstract

The invention provides a corrugated pipe expansion tool, and belongs to the field of petroleum drilling. The corrugated pipe expansion tool comprises an upper spiral reaming body and a lower spiral reaming body; a plurality of spiral upper reaming body side wings are uniformly arranged in the circumferential direction of the upper spiral reaming body; a lower spiral reaming body is connected to the lower portion of the upper spiral reaming body, and a plurality of spiral lower reaming body side wings are evenly arranged in the circumferential direction of the lower spiral reaming body; coaxialcenter holes are formed in the middle parts of the upper spiral reaming body and the lower spiral reaming body; and the spiral directions of the upper reaming body side wings and the lower reaming body side wings are opposite. According to the corrugated pipe expansion tool, a shaft can be reamed before the expansion corrugated pipe is tripped in, the expansion corrugated pipe is mechanically expanded after the expansion corrugated pipe is tripped in, and the corrugated pipe expansion tool has cutting capacity and cuts the excess weld metal of a welding seam of the expansion corrugated pipe.

Description

technical field [0001] The invention relates to a bellows expansion tool, which belongs to the field of petroleum drilling. Background technique [0002] Expanded bellows technology is to cold-press the round pipe to make the cross-section corrugated. During the drilling and completion process, the bellows pipe string is lowered into the well, and the pipe string is restored to a round pipe by hydraulic or mechanical means. , a drilling technique that realizes the sealing of complex formations and maintains the original borehole size. Its unique technical advantage is that it can continue to drill with the original size drill bit after it can reliably seal complex formations. The advantage of the expansion bellows technology is that it can isolate complex formations such as downhole leakage and easy collapse, simplify the wellbore structure, and reduce drilling costs. At the same time, this technology can be applied to casing subsidy, and can even achieve single-hole-size ...

AI Technical Summary

Problems solved by technology

The expansion rate of the existing reamer is generally large, and the diameter of the hole is irregular, which is difficult to meet the needs of the field application of the expansion bellows

Second, the bellows are connected by welding. Both the inner and outer walls of the bellows have weld reinforcements, and it is difficult to pass through the welds during mechanical expansion.

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