Pore-scale simulations of DPR gel placement



Title:Pore-scale simulations of DPR gel placement


Conferences (Konferanser)
Authors:Langaas, K.
Nilsson, S.
Stavland, A.
Research group:Økt utvinning (Improved Oil Recovery)
Distribution restriction:Open
Order no.:1999/239
Additional information:
20th Annual International Energy Agency Workshop and Symposium - Collaborative project on Enhanced Oil Recovery, Enghien-les-Bains, France, Sept 22-24, 1999;

The purpose of this paper is to investigate, by simulations, how a;gel affects the two-phase flow (oil and water) in a uniform;pore-space geometry under various wettability conditions;(neutral-wet, water-wet, oil-wet and fractional-wet). The gelant;is assumed to be attracted to water-wet walls and the gel itself;is assumed water-wet. It is of practical interest that the gel;reduces the water phase permeability more than it reduces the oil;phase permeability. This disproportionate permeability reduction;(DPR) is measured at steady state flow using the same driving;force before and after gel. The wanted DPR is found in both;neutral-wet, water-wet and fractional-wet systems, but depends on;the capillary number.;;The DPR is next tried optimized for the most promising case of;fractional wettability. The optimal DPR is found when using a;relative low gelant fraction ($\sim 0.2$) and a relative high;capillary number ($\sim 0.1$) when placing the gel in our;two-dimensional model. Also, the simulations indicate that the;gelant/oil viscosity ratio is not a critical parameter for the;gel-placement.;;;;;;;;;;;;

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