The imbibition of solutions of a model nonionic surfactant into packed beds of crushed reservoir rocks was studied using the Washburn technique. A linear dependence between the equivalent height of capillary rise and the square root of imbibition time was observed at different stages of imbibition experiments. It has been shown that, under the conditions when surfactants did not alter the polarity of rocks, the imbibition rate of surfactant solutions correlated well with the nondispersion (polar) component of the surface free energy of the rocks. It was possible to compare data obtained for different rocks by normalizing the slopes of imbibition curves over the corresponding slopes determined for a completely wetting fluid, hexamethyldisiloxane (HMDS). Such a normalization allowed one to account for substantial differences in the morphology of crushed rock powders. Overall, the observed trends in the imbibition behavior were qualitatively similar to the trends reported previously for the rise of surfactant solutions in single capillaries. The largest qualitative impact of nonionic surfactant was observed in the imbibition into hydrophobic oily sandstone, in which case a surfactant-induced shift to hydrophilicity was observed. Overall, high concentrations were needed in order to observe the impact of surfactant on the imbibition rate.

中文翻译：

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模型非离子表面活性剂对具有不同极性的储层岩石的润湿性：碎石块中的流体吸收研究

使用Washburn技术研究了模型非离子表面活性剂溶液向碎裂的储集岩填充床中的吸收作用。在吸收实验的不同阶段，观察到毛细管上升的等效高度与吸收时间的平方根之间的线性相关性。研究表明，在表面活性剂不改变岩石极性的条件下，表面活性剂溶液的吸收速率与岩石表面自由能的非分散（极性）成分密切相关。通过将吸水曲线的斜率标准化为完全润湿的液体六甲基二硅氧烷（HMDS）所确定的相应斜率，可以比较从不同岩石获得的数据。这种归一化使得人们可以解释碎石粉形态上的实质性差异。总体而言，观察到的吸收行为趋势在质量上与先前报道的单毛细管中表面活性剂溶液上升的趋势相似。在吸入疏水性油性砂岩中观察到非离子表面活性剂的最大定性影响，在这种情况下，观察到表面活性剂引起的向亲水性的转变。总的来说，为了观察表面活性剂对吸收速率的影响，需要高浓度。在吸入疏水性油性砂岩中观察到非离子表面活性剂的最大定性影响，在这种情况下，观察到表面活性剂引起的向亲水性的转变。总的来说，为了观察表面活性剂对吸收速率的影响，需要高浓度。在吸入疏水性油性砂岩中观察到非离子表面活性剂的最大定性影响，在这种情况下，观察到表面活性剂引起的向亲水性的转变。总的来说，为了观察表面活性剂对吸收速率的影响，需要高浓度。