The Gas Interception Technology for Protective Seam Mining with Directional Long Boreholes Developed by CCTEG Xi'an Research Institute Successfully Applied in Wangxingzhuang Coal Mine

Recently, the gas interception and extraction technology using floor-directed long-boreholes under the protective seam mining mode developed by CCTEG Xi'an Research Institute has been successfully applied at Wangxingzhuang Coal Mine, with a total footage of over 5,300 meters completed. This not only marks the first engineering application of the technology under complex geological conditions, but also achieves a breakthrough in the application of directional drilling technology in gas control at Wangxingzhuang Coal Mine, setting a technical benchmark for the safe and efficient production of regional coal mines.
The geological conditions in the construction area of the Wangxingzhuang Coal Mine are complex, placing extremely high requirements on borehole trajectory control. Traditional technologies struggle to achieve effective layer penetration and precise interception. Relying on the self-developed measurement-while-drilling system and refined guidance technology, the technical team of CCTEG Xi'an Research Institute successfully mitigated the significant risks posed by complex structures by dynamically optimizing drilling parameters and adjusting the borehole trajectory in real time. This ensured that the boreholes accurately penetrated the target coal seams and realized efficient gas interception.

This project marks the first time that Wangxingzhuang Coal Mine has introduced directional drilling technology for regional gas control. Compared with traditional dense cross-layer boreholes, directional drilling technology features a wide coverage per hole, high extraction efficiency, and significant cost advantages. By drilling long-distance, horizontally oriented central holes into the stable rock stratum of the upper protective seam's floor, a three-dimensional interception network is formed, significantly improving the pre-extraction effect. This lays a solid foundation for the subsequent transformation of the gas control model towards "regionalization, high efficiency, and precision".
The successful application of this technology under the complex geological conditions at Wangxingzhuang Coal Mine has fully verified the strong adaptability and high reliability of the directional, long-distance extraction technology at the coal seam floor. Its groundbreaking application not only addresses the urgent needs of the mine but also holds significant demonstration and promotion value for mining areas with similar conditions in Henan Province and even the entire North China region. It has explored a new path for comprehensive gas control in regional coal mines that is "technically reliable, economically feasible, and safely controllable", which is of far-reaching significance for promoting technological progress in the industry and ensuring safe energy production.