表面活性剂对油藏砂岩表面性质的影响

Effect of Surfactant on Surface Properties of Reservoir Sandstone

通过测量表面张力曲线、zeta电位以及油藏砂岩表面的润湿性,计算了3种表面活性剂在砂岩表面的吸附量.研究发现:阳离子型十六烷基三甲基溴化铵在砂岩表面吸附量很大并使砂岩表面电性发生反转,使砂岩表面由水湿变为弱水湿又恢复水湿;阴离子型十二烷基硫酸钠在砂岩表面发生了吸附并使砂岩表面的负电性增强;非离子型辛基苯酚聚氧乙烯醚对砂岩表面的带电行为影响不大,且在砂岩表面吸附量很小.

Based on surface tension curve,zeta potential and the wetability of reservoir sandstone measurements,the absorbance of surfactant on the reservoir sandstone was calculated.It was found that the amount of cetyltrimethylammonium bromide adsorbed was very large and the zeta potential of reservoir sandstone was reversed with the increasing surfactant concentration.Contact angle measurement revealed that the water affinity was first decreased and then recovered.Similarly,sodium laurylsulfate and octylphenol polyoxyethylene were adsorbed on the reservoir sandstone,and the former one made the zeta potential more negative whereas the latter one had a little effect.