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| Modeling Hydraulic Failure Process Using Elasto-Plastic Cellular Automaton |
| PAN Peng-Zhi-1, FENG Xia-Ting-1, WU Hong-Xiao-2, SUN Feng-1, ZHOU Hui-1 |
| (1. State Key Laboratory of Geomechanics and Geotechnical Engineering， Institute of Rock and Soil Mechanics， Chinese Academy of Sciences， Wuhan 430071， China；2. Second Artillery Engineering Design and Research Institute, Beijing 100011, China ) |
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Abstract A self-developed numerical tool, i.e. an elasto-plastic cellular automaton (EPCA) was used to simulate the hydraulic fracturing process of rocks. The modeling method of hydraulic fracturing process of heterogeneous rocks with cellular automaton was developed. With the increase of fluid load, fluid will go into the new cracks. The new fluid seepage boundaries will be formed and the tensile stress induced by fluid will be applied on the crack boundaries. In this process, the mechanical properties and boundary conditions will be updated dynamically. The cellular automaton, which is based on the localization theory, makes this operation more conveniently. With this method, the failure process of wellbore rock specimen under hydraulic pressure was simulated, by considering different heterogeneity and different inner radius of the wellbore. It is concluded that, in hydraulic fracturing process, the critical fluid pressure, crack propagation and final failure patterns etc. are greatly influenced by the heterogeneity of the rock, the boundary geometry etc.
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Published: 30 May 2011
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