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在油田注水开发其间，表面活性剂能够改变油、水两相之间的吸附性和界面张力。从而影响其Amott润湿指数和剩余油饱和度。文中研究了表面活性剂的浓度对它的影响。在温度为50℃时。在60块岩心柱中完成了水驱试验和Amott润湿指数试验，试验采用溶液是正庚烷和重量百分比为1.5％的Nacl溶液以及12种不同浓度的正十二烷基苯磺酸盐表面活性剂溶液，所使用岩心取自Berea沙岩，其平均孔隙度为19％，平均渗透率为104mD.实验结果表明。随着表面活性剂的浓度增加使岩石表面由水润湿性向弱的油润湿性转变。剩余油饱和度也随表面活性剂浓度的升高而降低；在表面活性剂浓度较低时其浓度较小的变化范围就可导致岩石表面从水润湿性通过过渡态最后到油润湿性的转变，该浓度范围与凝胶浓度临界点完全相符。在该浓度下对其吸附量进行测量。结果只相当于最大等温吸附值的10％，表面活性剂浓度越高。其吸附量也越高，而对真岩石表面的润湿性无太大影响。
During the development of oilfield waterflooding, surfactants can change the adsorption and interfacial tension between oil and water phases. Thus affecting its Amott wetting index and remaining oil saturation. In this paper, the effect of surfactant concentration on it is studied. At a temperature of 50 ℃. The water flooding test and the Amott wetting index test were completed in 60 core columns using a solution of n-heptane and 1.5% by weight Nacl solution and 12 different concentrations of n-dodecylbenzenesulfonate surfactant Agent solution, the core used is taken from Berea sandstone, the average porosity of 19%, the average permeability of 104mD. Experimental results show. As the surfactant concentration increases, the rock surface transitions from water wet to weak oil wet. The residual oil saturation also decreases with increasing surfactant concentration; smaller concentrations of surfactant at lower concentrations can result in the rock surface transition from water wet through the transitional state to oil wettability Of the transition, the concentration range and the gel concentration of the critical point exactly. The amount of adsorption was measured at this concentration. The result is only equivalent to 10% of the maximum isothermal adsorption value, the higher the surfactant concentration. The higher the amount of adsorption, but no effect on the wettability of the true rock surface.