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Calculation methods of sweep efficiency under different viscosity ratios for polymer flooding process
Author(s): 
Pages: 551-555
Year: Issue:  4
Journal: Oil & Gas Geology

Keyword:  viscosity ratiosweep efficiencypolymer floodingfive-spot well patternoil recovery;
Abstract: Considering the absorbing factor and inaccessible pore ,a five-spot well pattern model of polymer flooding was built on the base of polymer flooding mechanism analysis .By applying the stream tube method ,the areal two-dimensional model was simplified to several one-dimensional displacement models ,and a one-dimensional mathematical model of poly-mer flooding was established .On the basis of frontal displacement theory ,the whole process of two-dimensional polymer flooding was simulated by superimposing the displacement performance in each stream tube on the five -spot well pattern . This calculation process was compiled into the VBA software to map the relation between the sweep efficiency and mobili -ty ratios under different water cut conditions are draw ,thus providing a theoretical criteria for the polymer solution viscosi-ty preparation when performing IOR through polymer flooding .Comparison between the dynamic parameters with the ex-perimental results shows a good consistency .The advantages of the stream tube model set up in this paper are as follo-wing:less input parameters,quick calculation,well-adapting,and no dispersion effect of numerical simulation as in the traditional rectangular grid .Therefore,this method offers an effective tool for the early selection for polymer flooding and reservoir dynamic management .
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