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A Numerical Model for Evaluating Permeability and Porosity Damage of Dry Sandstone

Xiuxing Zhu, Shifeng Xue, Xinghua Tong

Abstract


In this paper, the evolution equations of porosity and permeability of dry sandstone are discussed and the numerical model for evaluating perforating damage is developed. With application of dynamic program LS-DYNA, the dynamic responses of dry sandstone around the tunnel are simulated, and the distribution of radial porosity and permeability are mapped. The results show that porosity values are even somewhat higher near the tunnel than that of the undamaged average porosity far away from the tunnel. In addition, permeability values of sandstone in crushed zone reduce significantly, which impairs the flow performance of reservoir severely. Furthermore, the more distance from the entrance of the tunnel, the smaller the reducing amplitude of crushed zone thickness, porosity values and permeability values will be. Moreover, as the shock load intensity increases or the strength of rock decreases, the damage degree will be more severe.



Keywords


Porosity, Permeability, Damage Evaluation, Numerical Model, Dry Sandstone.

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