Multistage hydraulic fracturing of a horizontal well for hard roof related coal burst control:Insights from numerical modelling to field application

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外文摘要：Multistage hydraulic fracturing of horizontal wells(MFHW)is a promising technology for controlling coal burst caused by thick and hard roofs in China.However,challenges remain regarding the MFHW control mechanism of coal burst and assessment of the associated fracturing effects.In this study,these chal-lenges were investigated through numerical modelling and field applications,based on the actual oper-ating parameters of MFHW for hard roofs in a Chinese coal mine.A damage parameter(D)is proposed to assess the degree of hydraulic fracturing in the roof.The mechanisms and effects of MFHW for controlling coal burst are analyzed using microseismic(MS)data and front-abutment stress distribution.Results show that the degree of fracturing can be categorized into lightly-fractured(D≤0.3),moderately fractured(0.3＜D≤0.6),well-fractured(0.6＜D≤0.9),and over-fractured(0.9＜D≤0.95).A response stage in the frac-turing process,characterized by a slowdown in crack development,indicates the transition to a well-fractured condition.After MFHW,the zone range and peak value of the front-abutment stress decrease.Additionally,MS events shift from near the coal seam to the fractured roof layers,with the number of MS events increases while the average MS energy decreases.The MFHW control mechanisms of coal bursts involve mitigating mining-induced stress and reducing seismic activity during longwall retreat,ensuring stresses remain below the ultimate stress level.These findings provide a reference for evaluating MFHW fracturing effects and controlling coal burst disasters in engineering.

外文关键词：

Coal burstMultistage hydraulic fracturing of horizontal wellsMining-induced seismicityMining-induced stressEffectiveness evaluation

作者：

Jiaxin Zhuang、Zonglong Mu、Wu Cai、Hu He、Lee J.Hosking、Guojun Xi、Biao Jiao

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作者单位：

Jiangsu Engineering Laboratory of Mine Earthquake Monitoring and Prevention,Xuzhou 221116,China

School of Mines,China University of Mining and Technology,Xuzhou 221116,China

State Key Laboratory for Fine Exploration and Intelligent Development of Coal Resources,Xuzhou 221116,China

School of Resources and Geosciences,China University of Mining and Technology,Xuzhou 221116,China

Department of Civil and Environmental Engineering,Brunel University London,Uxbridge,Middlesex UB8 3PH,UK

Shaanxi Binchang Hujiahe Mining Company Limited,Xianyang 713602,China

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基金：

National Natural Science Foundation of ChinaNational Natural Science Foundation of ChinaNational Natural Science Foundation of ChinaJiangsu Province Basic Research Special Fund-Soft Science ResearchState Key Research Development Program of China

项目编号：

522741475237410132111530138BZ20240242022YFC3004603

出版年：

2024

DOI：

10.1016/j.ijmst.2024.08.008

矿业科学技术学报(英文版)

中国矿业大学

矿业科学技术学报(英文版)

CSTPCDEI

影响因子：1.222

ISSN：2095-2686

年,卷(期)：2024.34(8)