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| Borehole stress calculating model coupling mechanics and chemistry in shale formation and its numerical solving method |
| Deng Jingen2 Guo Dongxu2 Zhou Jianliang3 Liu Shujie3 |
| 1 Petroleum University (Beijing), Beijing 102200 2 West_North Co. of SINOPEC, Xinjiang 830011 3 Research Center of CNOOC, Beijing 101149 |
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Abstract Borehole stability problem in shale formation exists in oilfields worldwide, and has not been properly solved yet. In this paper, stress distribution calculating model around borehole after shale hydration is present under the uniform in situ stress on the assumption that shale is linear elastic. The model is solved using finite differential method. Windows application program is written, which can calculate water content after shale hydration and stress redistribution around borehole. The rule of borehole collapse pressure changing with time is also analyzed using this program. The method and results in this paper are instructive for solving the problem of borehole stability in shale.
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Received: 25 April 2003
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KANG Hongpu1, 2, 3*, GAO Fuqiang1, 2, 3, WANG Xiaoqing1, 2, 3, YUAN Guiyang1, 2, 3, YANG Lei1, 2, 3, LOU Jinfu1, 2, 3. Development and application of a large-scale experimental system for roadway rockburst induced by fault slip[J]. , 2026, 45(6): 1599-1614. |
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2003, Vol. 22 
