Influences of clean fracturing fluid viscosity and horizontal in-situ stress difference on hydraulic fracture propagation and morphology in coal seam
Gang Wang1
Shuxin Wang2
Yixin Liu2
Qiming Huang2
Shengpeng Li2
Shuliang Xie2
Jinye Zheng2
Jiuyuan Fan2
1.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,China2.College of Safety and Environmental Engineering,Shandong University of Science and Technology,Qingdao 266590,China
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.
机标关键词：differencein-situstresscleanseamcoalfluidfracture
论文发表日期：2024-06-28
在线出版日期：2025-08-15（本平台首次上网日期，不代表文献的发表时间）
页数：17( 159-175 )
英文信息