amirhosein saeedi dehaghani

Through stability experiments, this study investigates the stability of foams prepared using Cetyltrimethylammonium Bromide (CTAB). The aim is to examine the influence of salt type, salinity, and brine composition on foam stability. The findings reveal that salts diminish stability at intermediate and high salinities, while the brine composition also significantly affects stability. By manipulating the composition, it is possible to achieve optimal foam stability. Specifically, seawater compositions with doubled concentrations of CaCl2, Na2SO4, KCl, NaCl, and identical concentrations of MgCl2 are identified as the optimum concentrations of smart water for attaining the best foam stability, with respective half-lives of 270, 298, 262, 280, and 248 seconds. Additionally, the longevity of CTAB foams is adversely affected by oils, although the impact varies depending on the type of hydrocarbon. Generally, more polar hydrocarbons exhibit a reduced negative effect on foam stability.

In studying the wettability alteration of oil reservoirs in enhanced oil recovery (EOR) techniques like water injection methods, special attention is paid to the composition of injected water. However, the extent of the impact of other factors, such as the oil and rock site density, and oil and rock surface area, is not given much attention. In this study, we analyze the sensitivity of discussed factors. First, oil adhesion to the rock surface was simulated using PHREEQC software (a geochemical reaction model), then the simulation results were modeled using Design-Expert software (a statistical software package). According to the findings, oil site density had the most influence on the oil adhesion, followed by oil and rock surface area in the second place. Because oil site density indicates the amounts of carboxylate groups on the oil surface, the increase in these functional groups increases the electrostatic bonds resulting in increased oil adhesion. Furthermore, the effect of parameters increases by increasing pH, and impressment will decrease above pH 8.