Coupled effects of stress damage and drilling fluid on strength of hard brittle shale

作     者：汪伟 邓金根 蔚宝华 郑小锦 闫传梁 邓月 WANG Wei;DENG Jin-gen;YU Bao-hua;ZHENG Xiao-jin;YAN Chuan-liang;DENG Yue

作者机构：State Key Laboratory of Petroleum Resources and ProspectingChina University of Petroleum 

出 版 物：《Journal of Central South University》 (中南大学学报（英文版）)

年 卷 期：2016年第23卷第12期

页      面：3256-3261页

核心收录：

学科分类：0820[工学-石油与天然气工程] 082001[工学-油气井工程] 08[工学] 

基　　金：Project(U262201)supported by National Natural Science Foundation of China 

主　　题：hard brittle shale stress damage drilling fluid time effect strength 

摘      要：During well drilling process,original stress state of hard brittle shale will be changed due to stress redistribution and concentration,which leads to stress damage phenomenon around the ***,drilling fluid will invade into formation along the tiny cracks induced by stress damage,and then weaken the strength of hard brittle *** on this problem,a theoretical model was set up to discuss damage level of shale under uniaxial compression tests using acoustic velocity *** specifically,considering the coupled effect of stress damage and drilling fluid,the relationship between hard brittle shale strength and elapsed time was analyzed.