Wettability of Supercritical Carbon Dioxide/Water/Quartz Systems: Simultaneous Measurement of Contact Angle and Interfacial Tension at Reservoir Conditions

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• 作者：Soheil Saraji ; Lamia Goual ; Mohammad Piri ; Henry Plancher
• 刊名：Langmuir
• 出版年：2013
• 出版时间：June 11, 2013
• 年：2013
• 卷：29
• 期：23
• 页码：6856-6866
• 全文大小：507K
• 年卷期：v.29,no.23(June 11, 2013)
• ISSN：1520-5827

文摘

Injection of carbon dioxide in deep saline aquifers is considered as a method of carbon sequestration. The efficiency of this process is dependent on the fluid鈥揻luid and rock-fluid interactions inside the porous media. For instance, the final storage capacity and total amount of capillary-trapped CO₂ inside an aquifer are affected by the interfacial tension between the fluids and the contact angle between the fluids and the rock mineral surface. A thorough study of these parameters and their variations with temperature and pressure will provide a better understanding of the carbon sequestration process and thus improve predictions of the sequestration efficiency. In this study, the controversial concept of wettability alteration of quartz surfaces in the presence of supercritical carbon dioxide (sc-CO₂) was investigated. A novel apparatus for measuring interfacial tension and contact angle at high temperatures and pressures based on Axisymmetric Drop Shape Analysis with no-Apex (ADSA-NA) method was developed and validated with a simple system. Densities, interfacial tensions, and dynamic contact angles of CO₂/water/quartz systems were determined for a wide range of pressures and temperatures relevant to geological sequestration of CO₂ in the subcritical and supercritical states. Image analysis was performed with ADSA-NA method that allows the determination of both interfacial tensions and contact angles with high accuracy. The results show that supercritical CO₂ alters the wettability of quartz surface toward less water-wet conditions compared to subcritical CO₂. Also we observed an increase in the water advancing contact angles with increasing temperature indicating less water-wet quartz surfaces at higher temperatures.