Construction method of large-diameter shaft reverse drilling in soft rock area

CN117627657BActive Publication Date: 2026-07-07BEIJING CHINA COAL MINE ENG CO LTD
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Patents(China)
Current Assignee / Owner
BEIJING CHINA COAL MINE ENG CO LTD
Filing Date
2023-10-24
Publication Date
2026-07-07

AI Technical Summary

Technical Problem

Existing reverse drilling methods are prone to wellbore collapse in soft rock areas, making it impossible to properly deploy anchor spraying mesh support, resulting in project delays and economic losses.

Method used

By controlling the discharge and support speed of the expanded borehole cuttings, and utilizing the expanded borehole cuttings containment wall and cuttings removal equipment, the expanded borehole cuttings are ensured to accumulate upwards along the wellbore and be supported in a timely manner. Air-cooled drill bits and mud drilling fluid are used to prevent borehole collapse, and anchor mesh spraying operations are carried out during the support process.

Benefits of technology

It effectively prevented wellbore collapse, improved construction efficiency, reduced wellbore construction costs, and achieved a safe and convenient construction process.

✦ Generated by Eureka AI based on patent content.

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Abstract

The application discloses a large-diameter shaft reverse drilling construction method in soft rock area. In the reverse drilling construction, the reaming rock slag generated in the reverse drilling construction is kept to be accumulated from the reaming rock slag falling point at the bottom of the shaft to the top of the shaft, the shaft is supported from top to bottom, the reaming rock slag is gradually transported away from the reaming rock slag falling point in the process of supporting the shaft, and the supporting speed of the shaft is matched with the transporting speed of the reaming rock slag. The large-diameter shaft reverse drilling construction method provided in the application overcomes the adverse conditions that the soft rock is easy to be broken and deformed, effectively prevents the shaft from being broken and collapsed by controlling the reaming rock slag discharge, improves the construction efficiency, and reduces the construction cost.
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