Critical condition study of borehole stability during air drilling

查看全文 作　　者：Deng [1]Jingen;Zou [1]Linzhan;Tan [1]Qiang;Yan [1]Wei;Gao [1]Deli;Zhang [2]Hanlin;Yan [3]Xiuliang

机构地区：[1]MOE Key Laboratory of Petroleum Engineering, China University of Petroleum, Beijing 102249, China;[2]Drilling Research Institute of Changqing Oilfield, Xi'an, Shaanxi 710048, China;[3]Drilling Research Institute of Shengli Oilfield, Dongying, Shandong 257100, China

出　　处：《Petroleum Science》索引2009年第6卷第2期,共8页

摘　　要：The purpose of this paper is to establish the existence of the critical condition of borehole stability during air drilling. Rock Failure Process Analysis Code 2D was used to set up a damage model of the borehole excavated in strain-softening rock. Damage evolution around the borehole was studied by tracking acoustic emission. The study indicates that excavation damaged zone (EDZ) is formed around borehole because of stress concentration after the borehole is excavated. There is a critical condition for borehole stability; the borehole will collapse when the critical damage condition is reached. The critical condition of underground excavation exists not only in elastic and ideal plastic material but in strain- softening material as well. The research is helpful to developing an evaluation method of borehole stability during air drilling. 关键词：空气钻井井壁稳定病情岩石破裂过程塑性材料发展中国家临界条件应变软化

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Critical condition study of borehole stability during air drilling

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