Department of Chemical Engineering, Curtin University, Perth, Australia.
Department of Petroleum Engineering, Curtin University, Perth, Australia.
J Colloid Interface Sci. 2018 Aug 15;524:188-194. doi: 10.1016/j.jcis.2018.04.029. Epub 2018 Apr 7.
Wettability plays an important role in underground geological storage of carbon dioxide because the fluid flow and distribution mechanism within porous media is controlled by this phenomenon. CO pressure, temperature, brine composition, and mineral type have significant effects on wettability. Despite past research on this subject, the factors that control the wettability variation for CO/water/minerals, particularly the effects of pores in the porous substrate on the contact angle at different pressures, temperatures, and salinities, as well as the physical processes involved are not fully understood.
We measured the contact angle of deionised water and brine/CO/porous sandstone samples at different pressures, temperatures, and salinities. Then, we compared the results with those of pure quartz. Finally, we developed a physical model to explain the observed phenomena.
The measured contact angle of sandstone was systematically greater than that of pure quartz because of the pores present in sandstone. Moreover, the effect of pressure and temperature on the contact angle of sandstone was similar to that of pure quartz. The results showed that the contact angle increases with increase in temperature and pressure and decreases with increase in salinity.
润湿性在二氧化碳的地下地质存储中起着重要作用，因为流体在多孔介质中的流动和分布机制受此现象控制。CO 压力、温度、盐水成分和矿物类型对润湿性有显著影响。尽管过去对此主题进行了研究，但控制 CO/水/矿物润湿性变化的因素，特别是多孔基质中的孔隙对不同压力、温度和盐度下接触角的影响以及所涉及的物理过程尚未完全了解。
我们测量了去离子水和盐水/CO/多孔砂岩样品在不同压力、温度和盐度下的接触角。然后，我们将结果与纯石英进行了比较。最后，我们开发了一个物理模型来解释观察到的现象。
由于砂岩中存在孔隙，砂岩的测量接触角系统地大于纯石英的接触角。此外，压力和温度对砂岩接触角的影响与纯石英相似。结果表明，接触角随温度和压力的升高而增大，随盐度的升高而减小。
