关键词: 聚合物, 流变性, 衰竭层效应, 表观粘度, 多孔介质

Abstract: The rheological behaviours of polymer solution both in a rheometer and in porous media were measured. The effects of depleted formation were calculated by means of two-fluid model and linear model for depleted layer. The depleted effects in a wider range of concentration and permeability of polymer solution were calculated with variations of polymer concentration and core permeability.The results show that the thicknesses of depleted formation were commensurate to the gyration radius of polymer molecule.The thicknesses of depleted formation calculated by linear model of depleted formations depleted layer are greater than those of two-fluid model.The thickness of depleted formation has a little change when the polymer concentration is lower.The thicknesses of depleted formation decrease with increasing concentrationis of polymer when the concentration of polymer is greater than that of overlap.The effect of thickness of depleted formation on apparent viscosity is significant even if the concentration of polymer is as high as 1500mg/L.The thicknesses of depleted formation are independent of the permeabilities of porous media.This effect may contribute to the flow of polymer in the lower part of a heterogeneous reservoir,and the sweep volume could increase.

Key words: polymer, rheological property, depleted formation, depletion effect, apparent viscosity, porous medium