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煤矿水力压裂岩层控制技术及应用

Strata control technology using hydraulic fracturing in underground coal mines and applications

  • 摘要: 随着煤矿开采深度与强度不断增加, 岩层控制难题日益凸显, 工作面强矿压、巷道围岩大变形、冲击地压及矿震等灾害日趋严重。水力压裂技术通过在岩层中产生人工裂缝, 主动调控岩层结构与围岩应力场, 达到弱化岩层和围岩卸压的目的, 在解决岩层控制难题方面展现出巨大潜力和广阔前景。本文回顾了煤矿水力压裂岩层控制技术的发展历史, 从理论分析、实验室试验及数值模拟角度介绍了水力压裂裂缝在岩层中扩展的研究成果, 阐述了水力压裂裂缝扩展形态、特征、规律及主要影响因素; 将煤矿岩层水力压裂技术分为3种, 分别为井下压裂、地面压裂及井上下协同压裂, 并对比分析了各种方法的特点、优势及适用条件; 介绍了煤矿井下局部水力压裂、区域压裂、地面压裂工艺及成套装备, 包括压裂泵组、工具串、切槽(缝)和射孔装置、监测系统等特性及主要技术参数。论述了水力压裂在巷道围岩卸压、工作面岩层控制及冲击地压防治的机理, 揭示了水力压裂“岩层结构改造-岩层能量释放-围岩应力调控”的核心力学机制, 并介绍了典型工程应用实例, 展示千米深井软岩巷道卸压、10 m超大采高综采工作面强矿压控制、冲击地压与矿震灾害防治等工程的应用情况和显著效果。最后, 分析了水力压裂目前存在的问题, 展望了水力压裂岩层控制技术的发展方向: 压裂理念向超前主动、区域化、一体化发展; 压裂设计向定量化、可视化、动态化发展; 压裂工艺与装备向精准化、自动化、智能化发展; 压裂监测向多源化、精确化、实时化发展。最终, 形成“精细探测—定量设计—智能施工—实时监测—全面评价—动态反馈”的水力压裂岩层控制技术体系, 为煤矿安全高效开采提供技术支撑。

     

    Abstract: As coal mining progresses to greater depths and higher intensities, challenges in strata control have become increasingly prominent. Disasters such as strong ground pressure at working faces, large deformation of roadway surrounding rock, rock burst, and mining-induced seismicity are becoming more severe. Hydraulic fracturing technology, by creating artificial fractures within rock strata to proactively modify the strata structure and adjust the surrounding rock stress field, achieves the goals of weakening strata and pressure relief. It demonstrates significant potential and broad prospects in addressing strata control challenges. This paper reviewed the development history of hydraulic fracturing for strata control in coal mines. It summarized research findings on fracture propagation by means of theoretical analysis, laboratory experiments, and numerical simulations, detailing the morphology, characteristics, patterns, and main influencing factors of hydraulic fracture propagation. The technology was categorized into three types, i.e., underground fracturing, surface fracturing, and coordinated surface-underground fracturing, and their features, advantages, and applicable conditions were comparatively analyzed. Besides, the paper introduced underground local and regional hydraulic fracturing technologies, surface fracturing processes, and complete equipment systems, including characteristics and key technical parameters of fracturing pump assemblies, tool strings, slotting (notching) and perforation devices, and monitoring systems. It also discussed the mechanisms of hydraulic fracturing in roadway pressure relief, working face strata control, and rock burst prevention, revealing its core mechanical principle of "strata structure modification–strata energy release–surrounding rock stress manipulation". Furthermore, it presented typical engineering application cases, and showcased remarkable outcomes in projects such as pressure relief in kilometer-deep soft rock roadways, control of intense ground pressure in 10 m super-high mining faces, and prevention of rock burst and mining-induced seismicity. Finally, the paper analyzed existing problems with current hydraulic fracturing practices and prospects future development directions. To be specific, the fracturing concept should evolve towards being proactive, regionalized, and integrated; the fracturing design should move towards quantification, visualization, and dynamization; the fracturing processes and equipment should advance towards precision, automation, and intelligence; and the fracturing monitoring should develop towards multi-source integration, accuracy, and real-time capability. The ultimate goal is to establish a comprehensive hydraulic fracturing strata control technology system characterized by "precise detection–quantitative design–intelligent operation–real-time monitoring–comprehensive evaluation–dynamic feedback", providing crucial technical support for safe and efficient coal mining.

     

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