3D reconstruction of porous structure and permeability simulation
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There is an urgent need to improve the efficiency of heavy oil production, which requires a better knowledge of the correlation between the microstructure characteristics and fluid properties. However, due to the size- and time-scale limitations, it's hard to directly observe ow behavior and the effects of fluid properties on recovery process. Also repeated drilling at different sites to get raw rock samples could be expensive. This situation motivates us to propose an approach to reconstruct the porous structure based on a few rock samples. With the reconstructed 3D structure, the correlation can be further determined and more experiments could be done. The data we received from our collaboration company Aramco were used to reconstruct 3D porous structure, then two nanoscribe technologies, two-photon lithography and large area projection micro-stereolithography were adopted to rebuild the porous structure. Some fluid tests were simulated and permeability of the rock sample were calculated based on Darcy's law and Kozenv-Carman equations. From the simulated results, the pressure at every point in the sample can be obtained and the permeability of the bare sample are 0.889 and 1.169 darcies respectively, when the fluid set to be water and base oil.