已掘巷道条件下防冲水平井分段压裂参数优化及应用
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中国矿业大学北京应急管理与安全工程学院

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TE35;TD713

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陕西省自然科学基础研究计划青年项目


Optimization and Application of Staged Fracturing Parameters for Anti-outburst Horizontal Wells in Mined Roadway Conditions
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School of Emergency Management and Safety Engineering,China University of Mining and Technology

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    摘要:

    针对已掘巷道条件下地面水平井压裂工艺参数控制不适,易诱发巷道次生破坏的问题,以永陇矿区招贤煤矿某工作面为工程背景,构建了兼顾压裂效果与巷道稳定性的施工参数优化方法。利用MFrac Suite、Abaqus及UDEC多软件协同,分别开展裂缝扩展模拟、压裂安全边界判定及围岩变形控制分析,并对压裂防冲效果进行治前预评价。结果表明:优化参数为注入排量14 m3/min、单段压裂液量1400 m3,在该条件下裂缝网络可完全覆盖工作面,且与巷道扰动裂隙边界保持外离状态,围岩变形满足控制要求;压裂通过改变覆岩结构完整性,使其由整体沉降向分段破断转变,最大下沉量、超前支承压力峰值降低显著;工程应用显示:压裂期间微地震监测裂缝能够完全覆盖整个工作面;压裂后回采时微震能量、事件频次、最大能量、平均来压步距等分别降低至未压裂的3%、10%、6%、23.26%,平均来压持续长度增加至未压裂的13.64%,能量呈高频低能均匀释放;压裂期间巷道次生破坏特征可控。研究表明,压裂防冲的本质在于通过结构弱化实现应力与能量的协同调控。研究成果可为同类工况条件下煤矿冲击地压治理提供技术参考。

    Abstract:

    : Aiming at the problem that inappropriate process parameter control of surface horizontal well fracturing under mined roadway conditions easily induces secondary damage to roadways, a construction parameter optimization method considering both fracturing effect and roadway stability was established with a working face in Zhaoxian Coal Mine of Yonglong Mining Area as the engineering background. Multi-software collaboration including MFrac Suite, Abaqus and UDEC was adopted to conduct fracture propagation simulation, fracturing safety boundary determination and surrounding rock deformation control analysis, respectively, and a pre-treatment evaluation was performed on the rock burst prevention effect of hydraulic fracturing.The results show that the optimized parameters are an injection rate of 14 m3/min and a single-stage fracturing fluid volume of 1400 m3. Under these conditions, the fracture network can completely cover the working face and remain outwardly separated from the boundary of roadway disturbed fractures, with the surrounding rock deformation meeting the control requirements. Hydraulic fracturing transforms the overburden strata from integral subsidence to segmented failure by altering the structural integrity of overlying strata, resulting in a significant reduction in the maximum subsidence and the peak value of advanced abutment pressure.Field engineering applications demonstrate that microseismic monitoring during fracturing verifies complete coverage of fractures over the entire working face. After fracturing, during coal mining, the microseismic energy, event frequency, maximum energy and average weighting interval decrease to 3%, 10%, 6% and 23.26% of those without fracturing, respectively; the average weighting duration increases to 13.64% of that without fracturing, and energy is released uniformly with high frequency and low magnitude. The characteristics of secondary roadway damage during fracturing are controllable.This study reveals that the essence of rock burst prevention via hydraulic fracturing lies in the collaborative regulation of stress and energy through structural weakening. The research findings can provide a technical reference for rock burst control in coal mines under similar working conditions.

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刘修刚. 已掘巷道条件下防冲水平井分段压裂参数优化及应用[J]. 科学技术与工程, , ():

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  • 收稿日期:2026-04-24
  • 最后修改日期:2026-06-05
  • 录用日期:2026-06-30
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