Nitrogen-assisted pneumatic directional drilling equipment and drilling slag removal methods for soft coal seams

By using nitrogen-driven directional drilling equipment and an annular upward air chamber design, the problems of insufficient pneumatic drive and dust pollution in drilling holes in soft coal seams have been solved, achieving efficient drilling and safe slag removal.

CN117888821BActive Publication Date: 2026-05-26SHANXI LUAN ENVIRONMENTAL ENERGY DEV CO LTD +1
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Patent Information

Application Number
CN202311811210.4
Authority / Receiving Office
CN · China
Patent Type
Patents(China)
Current Assignee / Owner
Filing Date
2023-12-27
Publication Date
2026-05-26
Estimated Expiration
2043-12-27

AI Technical Summary

Technical Problem

During drilling in soft and fractured coal seams, the resistance of the borehole wall to coal dust and other slag is high, resulting in insufficient power for pneumatic drilling and slag removal, easy damage to drilling tools, serious dust pollution, and safety hazards.

Method used

The nitrogen-driven directional drilling equipment utilizes an internal slag removal structure in the drill pipe to reduce the contact between the slag-carrying airflow and the coal face through an annular upward air chamber. Combined with the stability improvements of the logarithmic spiral tooth profile air screw motor and Tesla valve, it achieves efficient drilling and slag removal.

Benefits of technology

It reduces airflow resistance, increases drilling speed and slag removal efficiency, reduces drill bit damage and dust pollution, and improves safety.

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Abstract

This invention discloses a nitrogen-driven pneumatic directional drilling equipment for downhole cuttings removal in soft coal seams, comprising a nitrogen drive mechanism and a directional drilling rig. The directional drilling rig has a directional drill string assembly structure, which includes a drill rod. A probe outer tube is coaxially sleeved inside the drill rod, and a measuring probe is coaxially sleeved inside the probe outer tube. The measuring probe is used to measure the gas flow rate and pressure in the borehole. An annular downward air chamber for nitrogen gas flow is formed between the inner wall of the probe outer tube and the outer wall of the measuring probe. An air inlet is opened on the outer wall of the drill rod at the lower part, and an annular upward air chamber for nitrogen gas flow is formed between the inner wall of the drill rod above the air inlet and the outer wall of the probe outer tube. A trumpet-shaped wind shield, wider at the bottom and narrower at the top, is connected to the outer wall of the drill rod above the air inlet. This invention also discloses a corresponding borehole cuttings removal method. This invention significantly reduces the resistance to airflow, achieving faster drilling speeds and removing more cuttings under the same air volume and pressure.
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