Reaming traction device for arranging local casing pipe under horizontal drill hole

By designing a retractable diameter-reducing drill bit and pipe boot retractable hole retractable, the problem of not being able to sweep and retract in time when casing is installed under the crushing formation is solved, and effective retracting and casing traction under the crushing belt is achieved, ensuring the water release effect and reducing drilling costs.

CN222649945UActive Publication Date: 2025-03-21SHANDONG LONGYUAN GEOLOGICAL ENG CO LTD
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Patent Information

Application Number
CN202421575485.2
Authority / Receiving Office
CN · China
Patent Type
Utility models(China)
Current Assignee / Owner
Filing Date
2024-07-05
Publication Date
2025-03-21
Estimated Expiration
2034-07-05

AI Technical Summary

Technical Problem

When installing casing under the broken formation section, the casing is often inadequate due to problems such as drilling shrinkage, collapse, inability to sweep holes in time, and reaming, which affects the water release effect and increases drilling cost.

Method used

A reaming traction device is designed including a retractable diameter drill bit and a vertically arranged cylindrical structure. The drill bit is connected to the sleeve through a tube shoe, and can be reamed and swept through the telescopic shaft and adjusting member when encountering a broken belt, and pull the sleeve forward.

Benefits of technology

It realizes timely sweeping and reaming holes under the crushing belt to prevent hole collapse and other problems, ensures the water release effect and reduces drilling costs. The device structure is simple and compact, making it convenient for operation and production.

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Abstract

A broaching traction device with a local sleeve arranged below a horizontal drill hole comprises a vertically-arranged pipe shoe of a columnar structure and a telescopic reducing drill bit connected to the upper end of the pipe shoe. A thread groove / thread head which can be connected with a drill rod is arranged at the lower end of the pipe shoe; a connecting port is formed in the middle of the upper end of the pipe shoe, the drill bit comprises a telescopic shaft, the lower end of the telescopic shaft is elastically and telescopically arranged in the connecting port, and a top block is arranged at the upper end of the telescopic shaft; the drill bit further comprises an adjusting piece, the upper side and the lower side of the adjusting piece are hinged to the ejector block and the pipe shoe respectively, and the middle of the adjusting piece can be bent outwards when the telescopic shaft shrinks. When the lower casing pipe encounters a broken zone, the ejector block is extruded, the telescopic shaft is compressed, and meanwhile the adjusting piece is driven to bend outwards, so that diameter expanding of the drill bit is achieved, hole sweeping and hole expanding are conducted in time, the structure is simple and compact, and operation and production are convenient.
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