Sharif Digital Repository

Although the capability of using sulfate anion as a wettability modiffier is well established, no systematic investigation on the effect of sulfate ions and natural surfactants in the crude oil including asphaltene and resin on the interfacial tension (IFT) of acidic crude oil (ACO)/sulfate were performed. In this regards, the fluid/fluid interactions are tested through the IFT measurements for ACO, asphaltene and resin extracted from ACO in the presence of sulfate salts including Na2SO4, MgSO4 and CaSO4 while the concentration of each salt ranges between 0 and 45000 ppm. The obtained results demonstrate that the capability of asphaltene molecules is higher for IFT reduction compared with... 

It is well established that the heavy oil components including asphaltenes and resins play vital roles on the interfacial tension (IFT) of acidic crude oil (ACO) and aqueous solutions. Therefore, this experimental work is designed to investigate the possible synergism between salt ions, resin, and asphaltene on the IFT of ACO/low and high salinity brines containing MgCl2/NaCl and CaCl2. The results demonstrate that a complex ion of MgCl2 - resin component created in the solution could occupy the sites at the interface at high MgCl2 concentration. However, the results show that on the contrary, the molecular arrangement of MgCl2 and asphaltene at low and high MgCl2 concentration could be... 

The use of adjusted/optimized saline water categorized into two different classes namely smart water (SW) and low salinity (LoSal) water injection has been proposed for more oil recovery from specific types of oil reservoirs. There are possible mechanisms concerning SW flooding that have been proposed in the literature, some of them are still subject to more examination. In this study, an experimental investigation is performed to determine the influence of type and amount of salt to the surface properties including interfacial tension (IFT) and contact angle (CA) of aqueous solution + acidic and asphaltenic crude oil + carbonate rock systems. For this purpose, the concentration of different...