Download or read book Experimental Study of Rock-fluid Interfacial Interactions written by Soheil Saraji and published by . This book was released on 2013 with total page 131 pages. Available in PDF, EPUB and Kindle. Book excerpt: The distribution and multiphase flow of reservoir fluids in porous media are largely controlled by fluids-fluids and rock-fluids interactions. In this study, the rock-fluids interactions are experimentally investigated for two categories of systems representing oil reservoirs and deep saline aquifers in contact with carbon dioxide (CO2). In the first category, the adsorption of surface-active heavy molecules (i.e., asphaltenes) on mineral surfaces in the presence of brine can alter the wettability of reservoir rock towards oil-wet condition. The stability of thin brine films on mineral surfaces and hence the amount of asphaltene adsorption depends on the type of minerals in the rock and the brine chemistry. Although this phenomenon has been extensively studied in quartz systems, there are very limited systematic studies with reactive minerals such as calcite. Therefore, one objective of this research is to investigate the effect of brine chemistry (ion concentration, type, and valency) on the wettability of oil/brine/min- eral systems through dynamic adsorption of asphaltenes on quartz and calcite packs using UV-visible spectrophotometry. Different adsorption trends were observed with quartz and calcite and explained on the basis of the surface forces involved in the stability of thin brine films. In the second category (deep saline aquifers where carbon dioxide is sequestered), the final storage capacity and total amount of capillary-trapped CO2 were affected by the interfacial tension (IFT) between the fluids and the contact angle (CA) between the fluids and the rock mineral surface. There are currently very limited published data on contact angle of CO2/brine/mineral systems. Most of the existing studies were performed at am- bient temperature, under static or quasi-static conditions, and using subcritical CO2 phase without pre-equilibration. Important parameters (such as brine chemistry and impurities in CO2) have not been systematically studied. There are also inconsistencies in reported trends of contact angle versus pressure and temperature. Thus, another objective of this work is to study the effect of pressure, temperature, brine chemistry, and contaminants in CO2 on the wettability of CO2/brine/quartz systems. For this purpose, a new high-pressure and high-temperature (HPHT) IFT and CA apparatus was developed and validated. The density, IFT, advancing and receding CA of CO2/water/quartz systems were measured under HPHT conditions. Also the effects CO2 phase change, pressure, temperature, brine salinity, and presence of co-contaminants in CO2 phase were investigated. Also, important implications to CO2 sequestration are discussed at the end.