| This paper under the guidance of modern reservoir engineering theory, physicochemicaltheory, advanced instrumental analysis and core flooding tests, Polymer flooding systemthermal stability, viscoelasticity, the influence of the temperature on the viscosity anddynamic adsorption and in porous medum flow characteristics were studied. The studyshowed that as the temperature increases, viscosity of the polymer is reduced; Viscosity andelasticity of the polymer increases as the concentration and molecular weight of the polymerincreases; Dynamic adsorption of the polymer increases as the concentration and molecularweight of the polymer increases, with the increase of the permeability of the dynamicadsorption is reduced; As time increases, the viscosity of the polymer solution decreases;Only14million of the polymer molecular weight with permeability of35×10-3μm2coreshave better matching. Simultaneously on different permeability of homogeneous andheterogeneous cores to carry out different polymer flooding system flooding experiments.The results show: polymer concentration is constant, with the increase of polymer molecularweight, polymer flooding to increase oil recovery; When the molecular weight is constant,with increasing polymer concentration, polymer flooding to increase oil recovery; Injection offlooding system existing influence on recovery and injection pressure, injection rate thehigher the pressure, indicating expanding swept volume of the better; Anti rhythm corewaterflood recovery highest,positive rhythm core minimum, complex composite rhythm corepolymer flooding recovery smallest increase; Rhythmic core total recovery is the minimum,Anti rhythm core and complex composite rhythm core total recovery is almost the same;under similar core permeability, the same total thickness of the low-permeability layer, athick layer of low permeability core, such as water flooding recovery and total recovery werehigher than in the low-permeability layer ranging from thick core. |
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