Reservoir condition pore-scale imaging of multiple fluid phases using X-ray microtomography.

摘要: X-ray microtomography was used to image, at a resolution of 6.6 µm, the pore-scale arrangement residual carbon dioxide ganglia in pore-space carbonate rock pressures and temperatures representative typical formations for CO2 storage. Chemical equilibrium between CO2, brine phases maintained using high pressure temperature reactor, replicating conditions far away from injection site. Fluid flow controlled syringe pumps. To maintain in-situ within micro-CT scanner fiber coreholder used. Diffusive exchange across confining sleeve fluid prevented by surrounding core with triple wrap aluminum foil. Reconstructed contrast modeled polychromatic x-ray source, composition chosen maximize three phase two fluids rock. Flexible lines were reduce forces on sample during image acquisition, potentially causing unwanted motion, major shortcoming previous techniques. An internal thermocouple, placed directly adjacent core, coupled an external flexible heating PID controller constant cell. Substantial amounts trapped, saturation 0.203 ± 0.013, sizes larger volume obey power law distributions, consistent percolation theory.