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Experiments on the Stress Sensitivity of Ultra-low Permeability Sandstone Reservoirs |
QI Yadong1,2, ZHAN Jianfei3, LI Xiaoming4, MA Teng4, LI Jilin4, WU Liangjun5 |
1. Institute of Porous Flow and Fluid Mechanics, Chinese Academy of Sciences, Langfang 065007, Hebei Province, China;2. Graduate University of Chinese Academy of Sciences, Beijing 100190, China;3. Exploration and Development Research Institution, Daqing Oilfield Company, China National Petroleum Corporation, Daqing 163712, Heilongjiang Province, China;4. No. 3 Plant, Changqing Oilfield Company, China National Petroleum Corporation, Yinchuan 750006, China;5. No. 8 Plant, Changqing Oilfield Company, China National Petroleum Corporation, Xi'an 710021, China |
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Abstract: By means of experimental physical simulation, the influence of stress variation on the permeability of fractured and non-fractured ultra-low permeability sandstone cores were researched, the permeability variation of the two types of cores were compared with each other, and the stress sensitivity characteristics of the fractured and non-fractured reservoirs were summarized. The results show that for both fractured and non-fractured reservoirs, the lower permeability is, the stronger sensitivity of permeability stress is. For non-fractured reservoirs, when the reservoir permeability is lower than 2×10-3μm2, the sensitivity of permeability stress is strong and the strength increases rapidly as the permeability decreases, and when the reservoir permeability is higher than 5×10-3μm2, the sensitivity of permeability stress is weak; the fractured reservoirs stress sensitivity is much stronger than that for non-fractured ones; and the permeability loss of fractured reservoirs caused by the effective stress increase is 2—3 times of that for non-fractured reservoirs; and the permeability is unable to recover completely after the effective stress decreases, and the permeability loss of fractured reservoirs is 5 times of that for non-fractured reservoirs. The research findings are useful for engineers to determine the development strategy for ultra-low permeability sandstone reservoirs.
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Received: 29 November 2011
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