Abstract
The previously proposed model of oil displacement by an active solution [1, 2] is extended to the case in which the relative phase permeabilities depend on the percolation velocity and interfacial tension as functions of the active agent concentration. For this purpose the phase permeability curves are approximated by functions of two variables — saturation and capillary number. An analytical description of the structure of the displacement zone in an extended stream tube of variable cross section is given for continuous pumping of the active solution and the use of a finite batch (slug). The coefficient of displacement of the oil from the near-well zone and an annular element of the reservoir is calculated by a finite-difference method [3] for various operating conditions. This approach could be useful in analyzing the efficiency of different methods of improving oil recovery.
Published Version
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