283325 Pore Scale CO2 Displacement in Sandstone with Comparison to Core Scale Dynamics

Tuesday, October 30, 2012
Hall B (Convention Center )
Dustin Crandall1, Robert P. Warzinski1, William O'Connor2, Aslam M. Kabir3 and Grant Bromhal4, (1)National Energy Technology Laboratory, U.S. Department of Energy, Pittsburgh, PA, (2)NETL, Office of Fossil Energy, US DOE, Albany, NY, (3)U.S. Department of Energy, National Energy Technology Laboratory, Pittsburgh, PA, (4)National Energy Technology Laboratory, Morgantown, WV

Combining micro-computed tomography scanning and computational fluid dynamics this study examined how CO2 displaces brine in a small volume of pore space. The pore volume (4.41 (10-11) m3) was obtained from an Xradia Micro XCT-400 scanner with a voxel resolution of 27.1 microns from a sub-core of Mt Simon sandstone, recovered from a depth of ≈1770m. The complex micro-structure was preserved via careful three-dimensional reconstruction of the scanned data into a fully meshed volume, with over 3.5 million hexahedral cells. A series of simulations was performed with the commercial CFD code FLUENT to evaluate the immiscible flow behavior of CO2 and brine within this volume, under a range of conditions that might be expected at a CO2 storage site. This was done using the volume-of-fluid method to handle multiphase flow, and solving the full Navier-Stokes equations. Initial results show that an increase in the CO2 viscosity, which could be obtained by adding a surfactant or by increasing depth of the injection, results in an increase in the residual volume of CO2 within the pore space.

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