Responses of chemically active and naturally fractured shale under time‐dependent mechanical loading and ionic solution exposure |
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| Authors: | Chao Liu Son K Hoang Younane N Abousleiman |
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| Affiliation: | 1. PoroMechanics Institute, The University of Oklahoma, Norman, OK, U.S.A.;2. Mewbourne School of Petroleum and Geological Engineering, The University of Oklahoma, Norman, OK, U.S.A.;3. Bien Dong POC, Ho Chi Minh City, Vietnam, formerly at PoroMechanics Institute, The University of Oklahoma, Norman, OK, U.S.A.;4. ConocoPhillips School of Geology and Geophysics, The University of Oklahoma, Norman, OK, U.S.A.;5. School of Civil Engineering and Environmental Science, The University of Oklahoma, Norman, OK, U.S.A. |
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| Abstract: | In this paper, the analytical dual‐porosity dual‐permeability poromechanics solution for saturated cylinders is extended to account for electrokinetic effects and material transverse isotropy, which simulate the responses of chemically active naturally fractured shale under time‐dependent mechanical loading and ionic solution exposure. The solution addresses the stresses, fracture pore pressure, matrix pore pressure, fluid fluxes, ion concentration evolution, and displacements due to the applied stress, pore pressure, and solute concentration difference between the sample and the circulation fluid. The presented solution will not only help validate numerical simulations but also assist in calibrating and interpreting laboratory results on dual‐porosity dual‐permeability shale. It is recommended that the analytical solutions of radial and axial displacements be used to match the corresponding laboratory‐recorded data to determine shale dual permeability and chemo‐electrical parameters including membrane coefficient, ions diffusion coefficients, and electro‐osmotic permeability. |
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| Keywords: | chemically active dual‐poro‐chemo‐electro‐elasticity electro‐osmotic permeability natural fractures shale |
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