砂岩表面Zeta电位测定探讨

用固体表面Zeta电位仪测量了目标岩石表面Zeta电位随pH值的变化情况,结果表明:目标岩石表面Zeta电位测定的pH值适宜范围为7~10,这是因为pH值小于7时溶液会与岩石表面发生化学反应,pH值大于10时,溶液也会与岩石表面含铝的成分发生化学反应.对Zeta电位测定前样品的处理方法进行了初步探讨.结果表明:用NaOH溶液处理过的样品Zeta电位测定值重复性较好.

Measurement of the Zeta potential on sandstone surface

The zeta potential on the surface of reservoir sandstone in different media of pH is measured by using SurPASS Electrokinetic Analyzer.The results show that the measurement of the zeta potential on the surface of the reservoir sandstone is suitable when the pH of media is between 7 and 10.It is because when the pH is lower than 7,there will be chemical reaction between the surface of the sandstone and the solution of the media,and when the pH is higher than 10,there will also be chemical reaction between the solution of media and the aluminum on the surface of the reservoir sandstone.The pretreatment of the samples whose surface zeta potential needs to be measured is preliminarily studied.The result shows that the repeatability of the surface zeta potential measurement of the samples pretreated with NaOH is better than that of the samples untreated.