Micromodels / Microfluidics
Two-phase multiphase flow of miscible fluids in porous media is ultimately determined by pore-scale processes. Pore-level observations of fluid flow as well as oil and gas-trapping mechanisms are valuable to interpret observations at larger scale (i.e., core scale). Such observations also help us to deepen our mechanistic understandings and provide validation of pore network models and direct numerical simulations of fluid flow.
We create microfluidic devices, referred to as micromodels, using electronics grade silicon wafers and photolithographic techniques. Two-dimensional micromodels allow direct observation of pore-scale events. They contain an etched pore network pattern that is directly observable with a microscope. A first step is the imaging of representative pore features in rock thin sections. The end result is a two-dimensional medium with a precisely known pore network pattern and number of pores. To date, we have created micromodels of Berea sandstone, a heavy-oil sand, an idealized rough fracture, and a dual porosity limestone.
Current projects in the area of microfluidics are:
micromodel, microfluidics, multiphase flow, gas trapping, foam, enhanced oil recovery, waterflooding, polymer injection, dual porosity, fractured reservoir sandstone, carbonate