Abstract
The rheological behavior of viscous-elastic polymer solution in porous media of an oil reservoir is different from that in the shearing rheometer. Its flowing complexity lies in not only the complication of polymer's molecular structure and character but also in the change of the physicochemical effect between formation and polymer in space and time, which make it difficult to describe rheological behavior of viscous-elastic polymer solution in porous media. Based on the analysis of viscous-elastic polymer solution flowing in a throat of porous media, the flowing process is divided into three stages as entrance constriction, pore passage, and extrusion. Accordingly, the pressure drop in every stage is separated into viscous drop and elastic drop. Pressure expressions of every stage are established with a tensor analysis method in consideration of such factors as pseudoplasticity, elastic properties, elastic recovery characteristics, pore throat ratio, porosity, and other characteristics. As a result, the constitutive model of viscous-elastic solution in the porous media is established, which is examined and analyzed by a shearing and rheological experiment and a displacement experiment.
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