Abstract
One of the major restrictions to increased oil recovery from reservoirs is poor sweep efficiency, caused by an interfacial instability phenomenon termed “viscous fingering”. The efficiency of miscible two-phase displacement of Newtonian fluids is directly related to the viscosity ratio between the displaced and displacing fluids \ii/\i2 where subscript 1 denotes the displaced fluid and subscript 2 denotes the driving (or displacing) fluid. If the viscosity ratio is unity or less, stable displacement occurs and the sweep efficiency is a maximum. If the viscosity ratio is greater than unity, the driving fluid (water) will finger through the displaced fluid (oil) leaving it in place in the reservoir.
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