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| Variable permeability modulus and pressure sensitivity of dual porosity medium |
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WANG Jian zhong1, YAO Jun1, ZHANG Kai1, HAO Zhen jiang2
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(1. College of Petroleum Engineering in China University of Petroleum, Qingdao 266555,China;2. 3rd Oil Production Plant of Changqing Oilfield, Yinchuan 750000, China)
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| Abstract: |
| The permeability modulus of fracture changes with the effective stress in pressure sensitive dual porosity medium. Taking permeability modulus as a constant will lead to large error. The laws of permeability modulus variation with effective stress were investigated by mathematical analysis and experimental study, and a mathematical model of well testing interpretation was developed for pressure sensitive dual porosity reservoir. The results show that the permeability of dual porosity medium with many fractures is sensitive to pressure. And the permeability modulus decreases gradually with the effective stress increasing. The pressure sensitive medium has relatively large permeability modulus and large coefficient of permeability modulus variation. |
| Key words: dual porosity medium variable permeability modulus effective stress pressure sensitivity |
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