重烷基苯磺酸盐在岩石矿物上的静态吸附

Static adsorption of heavy alkylbenzene sulfonate on rock minerals

在化学驱油过程中,表面活性剂在矿物上的吸附是引起表面活性剂损失的重要原因之一。分析了表面活性剂的吸附机理,研究了重烷基苯磺酸盐在大庆油田几种岩石矿物上的静态吸附损失。研究结果表明,表面活性剂在4种岩石骨架矿物上的最大吸附量多数为1mg·g-1以下,而2种黏土矿物的最大吸附量达到3mg·g-1以上,反映出表面活性剂在多孔介质中的吸附损失多发生在黏土上。曲线拟合分析表明,Freundlich模型不能描述重烷基苯磺酸盐在矿物上的静态吸附特征,有关Langmuir模型,还需要进行进一步的实验研究。

The adsorption of surfactant on mineral surface of rocks during chemical flooding is one of important reasons causing the loss of surfactant. The paper analyzed the adsorption mechanism of surfactant and studied the static adsorption of heavy alkylbenzene sulfonate on several rock minerals in Daqing Oilfield. The result shows that the maximum adsorption of surfactant on four kinds of rock matrix minerals is mostly under 1 mg/g, while that of two kinds of clay minerals can reach above 3 mg/g, reflecting that the adsorption loss of surfactant on porous media mostly happens on clay. The analysis of curve fitting verifies that Freundlich model cannot describe the canracteristics of static adsorption of heavy alkylbenzene sulfonate on minerals. As to Langmuir model, we need to do further experimental study.