聚丙烯酰胺对砂岩润湿性的影响

在分析了常用的评价岩石润湿性方法的基础上,建立了一套研究部分水解聚丙稀酰胺分子对岩石颗粒润湿性影响的填砂管驱替实验方法,并不同矿化度及聚合物浓度条件下,测定了的聚合物溶液对石英砂润湿性的影响。实验结果表明,用聚合物溶液浸泡过的石英砂,其束缚水饱和度明显升高,残余油饱和度有所降低,使颗粒的润湿性向亲水方向变化。聚合物浓度和溶液矿化度将影响聚丙烯酰胺改变颗粒润湿性的能力。在聚合物驱所用的浓度范围内和所关心的矿化度范围内,聚合物浓度越高,改变润湿性的能力越强;溶液矿化度越高,这种能力越小。

EFFECT OF PARTIALLY HYDROLYZED POLYACRY LAMIDE ON SAND PARTICLE WETTABILITY

Based on the analysis of conventional rock wettability evaluation methods, a sand-pack flooding experiment procedure for the research of effect of partially hydrolyzed polyacrylamide on sand partial wettability has been established. Use this procedure, the effect of polymer solution on sand grain wettability is measured under different TDS and polymer concentrations. The results show that the presence of adsorbed polymer always induces an increase in the water irreducible saturation and decrease the residual oil saturation. It makes the sand grain become more water-wettability. The enhancement of the water-wettability of the sand grain affected by polymer concentration and TDS. It increases with polymer concentration and decreases with TDS in the interesting ranges.