煤岩动力灾害井下定向长钻孔区域压裂防治技术与工程实践进展

Advances in regional fracturing technology using underground long directional boreholes for the prevention and control of coal-rock dynamic disasters and its engineering practices

  • 摘要:
    目的 煤岩动力灾害是制约深部煤炭安全高效开采的核心问题,亟需发展区域化、超前化、精准化的主动防控技术。
    进展 (1) 煤矿井下定向长钻孔区域压裂防治技术历经从地面起源到井下区域化拓展的发展阶段。形成了以“地质成因−开采响应−致灾机制”为导向的区域压裂防治理论,以及涵盖大功率定向钻机、大排量变频压裂泵组、无限级分段与精准控缝工具的核心装备体系。(2) 相关技术理论和装备已应用于覆盖我国主要产煤区的多类典型工程。实践验证了其在冲击地压、矿震、瓦斯突出等单一及复合灾害中的工程成效:通过力源调控与覆岩结构协同弱化,有效遏制强矿压与大能量释放;瓦斯抽采效率提升数倍至数十倍;矿震能量释放模式由“低频高能”转向“高频低能”。(3) 当前,采用煤矿井下定向长钻孔区域压裂技术防治煤岩动力灾害,仍面临智能化装备研制、裂缝精准表征与防治效果定量溯源等技术瓶颈。数据驱动与深度学习赋能的智能化压裂、数字孪生裂缝可视化、效果定量溯源等是未来攻关方向,以期为深部煤岩动力灾害的精准防控提供理论支撑与技术参考。

     

    Abstract:
    Objective Coal-rock dynamic disasters represent a key challenge to the safe and efficient mining of deep coals, rendering it urgent to develop regional, advance, and precise technologies for proactive disaster prevention and control.
    Advances  The regional fracturing technology using underground long directional boreholes for disaster prevention and control in coal mines originated from ground fracturing. To date, a regional fracturing theory oriented to geological origin, mining responses, and disaster-causing mechanisms has been developed. Furthermore, a core equipment system incorporating high-power directional drilling rigs, variable frequency fracturing pump sets with high injection rates of fracturing fluids, infinite stage fracturing, and tools for precise fracture control has been established. Relevant technical theory and equipment have been applied to various representative projects in major coal-producing areas of China, verifying their effectiveness in the prevention and control of individual and compound disasters, including rock bursts, mining-induced seismicity, and gas outbursts. Specifically, force source control, combined with the collaborative weakening of overburden structures, allows strong rock pressure and intense energy release to be effectively curbed; the gas drainage efficiency is increased by several to dozens of times; and the energy release mode of mining-induced seismicity is shifted from low frequency and high energy to high frequency and low energy. Presently, the regional fracturing technology still faces technical bottlenecks in the research and development of intelligent equipment, accurate fracture characterization, and quantitative traceability of disaster prevention and control effects. Future research should focus on data-driven and deep learning-empowered intelligent fracturing, digital twin-based fracture visualization, and the quantitative traceability of fracturing performance. These efforts are expected to provide theoretical support and a technical reference for the precise prevention and control of deep coal-rock dynamic disasters.

     

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