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本文研究了用于碱-聚合物驱的部分水解聚丙烯酰胺溶液在阳离子含量一定,改变 pH 值时溶液粘度的变化情况,对溶液粘度随 pH 值上升而增大的现象给出了理论上的解释。探讨了不同碱剂和不同碱剂浓度对部分水解聚丙烯酰胺溶液的 pH 值和粘度(η)的影响。发现随着溶液阳离子含量的上升,粘度下降的速率(Δη/Δ[Na~+])由大而转小,在粘度(η)下降过程中存在一个趋势转折点。研究了碱-聚合物驱体系和聚合物驱体系在拟地层条件、高温(60℃)下的热稳定性,聚合物溶液在室温下放置时溶液性质的变化。对碱-聚合物驱油机理进行了一些解释。
In this paper, the change of viscosity of solution of partially hydrolyzed polyacrylamide solution used in alkali-polymer flooding with constant cation content and pH value is studied. The phenomenon that the solution viscosity increases with pH value is given in theory Explanation. The effects of different alkali agents and different alkali concentrations on the pH value and viscosity (η) of partially hydrolyzed polyacrylamide solution were discussed. It is found that the rate of decrease in viscosity (Δη / Δ [Na~ +]) decreases from large to small as the cation content of the solution increases. There is a tendency turning point in the decrease of viscosity (η). The thermal stability of the alkali-polymer flooding system and polymer flooding system under pseudo-formation conditions, high temperature (60 ℃), and the change of solution properties when the polymer solution was placed at room temperature were studied. The mechanism of alkali-polymer flooding is explained.