The research described in this NSF CAREER project is emphasized as a critical area
of Science and Technology under the University of Wyoming Plan and the Wyoming NSF
EPSCoR program. The objective is to investigate the effect of mineralogy and wettability
on the transport and remediation of NAPLs in heterogeneous rocks. The project is designed
to conduct innovative high-impact research activities that will be disseminated into
effective learning tools. It provides great opportunities to train students through
multi-facet research and education in STEM-related areas using state-of-the-art imaging
and modeling techniques.
X-ray computed microtomography is used: (i) to generate high-resolution maps of pore
space topology and mineralogy in rock samples from which network models are constructed,
and (ii) to perform well-characterized in-situ flow experiments to measure fluid occupancy
and the effect of chemical additives on NAPL remediation in the same rocks. The impact
of NAPLs on wettability alteration is examined using a state-of-the-art interfacial
tension and contact angle apparatus. A pore-scale network model is also used for two-phase
flow simulations and rigorously validated against experimental data to predict the
performance of surfactant-enhanced remediation methods. The model uses most realistic
representations of pore-space topology and explicitly accounts for heterogeneities
in rock mineralogy and wettability on a pore-by-pore basis to faithfully predict the
impact of wettability alteration on NAPL displacement mechanisms in heterogeneous
rocks.
Results from this investigation are expected to advance knowledge and understanding
in industrial applications such as management and optimization of water resources,
remediation of contaminated aquifers, underground storage of flue gases, and improved
oil recovery from conventional and unconventional resources.
