Investigation on the physical-mechanical response characteristics and failure mechanisms of shale under the laser thermal field
Yuze Du1
Jing Xie1
Zheqiang Jia2
Li Ren3
Zeyu Zhu1
Junjun Liu4
Lei Yang1
Ting Ai3
Bengao Yang1
Mingzhong Gao5
1.State Key Laboratory of Hydraulics and Mountain River Engineering,College of Water Resource and Hydropower,Sichuan University,Chengdu 610065,Sichuan,China2.China Railway Eryuan Engineering Group Co.Ltd.,,Chengdu 610031,China3.MOE Key Laboratory of Deep Earth Science and Engineering,College of Architecture and Environment,Sichuan University,Chengdu 610065,Sichuan,China4.State Key Laboratory of Hydraulics and Mountain River Engineering,College of Water Resource and Hydropower,Sichuan University,Chengdu 610065,Sichuan,China;State Key Laboratory of Intelligent Construction and Healthy Operation and Maintenance of Deep Underground Engineering,College of Civil and Transportation Engineering,Shenzhen University,Shenzhen 518060,Guangdong,China5.State Key Laboratory of Hydraulics and Mountain River Engineering,College of Water Resource and Hydropower,Sichuan University,Chengdu 610065,Sichuan,China;State Key Laboratory of Intelligent Construction and Healthy Operation and Maintenance of Deep Underground Engineering,College of Water Resource and Hydropower,Sichuan University,Chengdu 610065,Sichuan,China;State Key Laboratory of Intelligent Construction and Healthy Operation and Maintenance of Deep Underground Engineering,College of Civil and Transportation Engineering,Shenzhen University,Shenzhen 518060,Guangdong,China
摘要：The mainstream method for extracting shale gas involves hydraulic fracturing to create fracture networks.However,as extraction depth increases,notable issues such as rapid production decline,low recovery rates,high water consumption,and resource waste become apparent.Identifying new and efficient auxiliary rock-breaking technologies is crucial for overcoming these challenges.The laser,successfully utilized in industrial production,medical treatment,and technological research,offers unique features such as good directionality,coherence,and high energy density,providing novel possibili-ties for addressing the limitations of existing deep reservoir transformation.This research focuses on a novel laser-assisted rock-breaking technology,with shale featuring different bedding angles as the subject of investigation.The investigation methodically explored how shale responded to thermal fracture at high temperatures when exposed to laser irradiation with different spot diameter.It investigates the spatiotemporal evolution characteristics of the shale temperature field under laser irradiation,the propagation features of cracks on shale surface,and the physicochemical fracture mechanisms.The research yields the following results:(1)The region of thermal influence of the irradiation surface can be divided into three regions based on the change of rise curve of temperature in the shale surface.(2)Based on the scanning electron microscopy(SEM)testing,combined with the macroscopic and microscopic morphological characteristics of shale fracture surfaces,it reveals significantly distinct zoning characteristics in the roughness of the rock sample's fracture surfaces after laser irradiation.(3)The thermal fracturing process of shale under laser irradiation involves chemical reactions of constituent minerals and stress generated by the thermal expansion of shale oil in the reservoir.(4)The damage and fracture of shale under the irradiation of laser show significant bedding effect,and there are three modes of rock sample failure:Pattern T(thermal failure),Pattern T-B(thermal and bedding synergistic failure),and Pattern B(bedding failure).The research findings presented in this article serve as a foundation and reference for the theory and technology of laser-assisted shale gas extraction.
机标关键词：characteristicsphysicalshalelaserfieldfailureinvestigationmechanical
论文发表日期：2025-04-30
在线出版日期：2025-10-15（本平台首次上网日期，不代表文献的发表时间）
页数：24( 158-181 )
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