Regensburg 2019 – wissenschaftliches Programm
CPP 25.55: Poster
Dienstag, 2. April 2019, 14:00–16:00, Poster B1
Microscopic investigation of polymer flow in porous media — •Pegah Shakeri1,2, Michael Jung1,2, Martin Brinkmann1, Stephan Herminghaus2, and Ralf Seemann1,2 — 1Universität des Saarlandes, Saarbrücken, Germany — 2Max Planck-Institute for Dynamics and Self-Organization, Göttingen, Germany
The displacement of a fluid from a permeable medium by injecting a second immiscible fluid is central in many industrial processes like oil recovery. The general assumption is that the polymer modifies the viscosity of the injected fluid; thus improves the volumetric sweep efficiency (the amount of displaced oil) by enhancing mobility ratio and controlling viscous fingering in macro scale. However, recent observations suggest that additionally microscopic effects are important; thus microscopic investigation of a polymer flow in a quasi-2D microfluidic device was conducted to gain clear insight into the pore scale mechanism of oil displacement by a polymer solution in permeable media. Deviation from laminar flow, fluctuating oil-polymer solution interfaces, lower residual saturation in comparison to a flood of water or aqueous glycerol solution (having the same zero shear viscosity as the polymer solutions) were observed. The observed instabilities in the bulk flow,which seem to originate from viscoelasticity of the polymer solution, destabilize the oil-polymer interface and are consequently capable of improving the microscopic displacement.