Influences of clean fracturing fluid viscosity and horizontal in-situ stress difference on hydraulic fracture propagation and morphology in coal seam

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外文摘要：The viscosity of fracturing fluid and in-situ stress difference are the two important factors that affect the hydraulic fracturing pressure and propagation morphology.In this study,raw coal was used to prepare coal samples for experiments,and clean fracturing fluid samples were prepared using CTAB surfactant.A series of hydraulic fracturing tests were conducted with an in-house developed triaxial hydraulic fracturing simulator and the fracturing process was monitored with an acoustic emission instrument to analyze the influences of fracturing fluid viscosity and horizontal in-situ stress difference on coal fracture propagation.The results show that the number of branched fractures decreased,the fracture pattern became simpler,the fractures width increased obviously,and the distribution of AE event points was concentrated with the increase of the fracturing fluid viscosity or the horizontal in-situ stress difference.The acoustic emission energy decreases with the increase of fracturing fluid viscosity and increases with the increase of horizontal in situ stress difference.The low viscosity clean fracturing fluid has strong elasticity and is easy to be compressed into the tip of fractures,resulting in complex fractures.The high viscosity clean fracturing fluids are the opposite.Our experimental results provide a reference and scientific basis for the design and optimization of field hydraulic fracturing parameters.

外文关键词：

Clean fracturing fluidHydraulic fracturingViscosityHorizontal in-situ stress differenceHydraulic fracture morphologyAcoustic emission

作者：

Gang Wang、Shuxin Wang、Yixin Liu、Qiming Huang、Shengpeng Li、Shuliang Xie、Jinye Zheng、Jiuyuan Fan

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作者单位：

College of Safety and Environmental Engineering,Shandong University of Science and Technology,Qingdao 266590,China

Mine Disaster Prevention and Control-Ministry of State Key Laboratory Breeding Base,Shandong University of Science and Technology,Qingdao 266590,China

基金：

project of National Natural Science Foundation of Chinaproject of National Natural Science Foundation of Chinaproject of National Natural Science Foundation of ChinaShandong Provincial Colleges and Universities Youth Innovation and Technology Support ProgramTaishan Scholars ProjectShandong outstanding youth fund

项目编号：

5197417652174194519340042019KJH006TS20190935ZR2020JQ22

出版年：

2024

DOI：

10.1007/s40789-024-00692-y

国际煤炭科学技术学报(英文)

CSTPCD

ISSN：2095-8293

年,卷(期)：2024.11(3)