Novel application of PEG/SDS interaction as a wettability modifier of hydrophobic carbonate surfaces

Abstract

Wettability alteration of carbonate reservoirs from oil-wet to water-wet is an important method to increase the efficiency of oil recovery. Interaction between surfactants and polymers can enhance the effectiveness of surfactants in EOR applications. In this study, the interaction of polyethylene glycol (PEG) with an ionic surfactant, sodium dodecyl sulphate (SDS), is evaluated on an oil-wet carbonate rock surface by using contact angle measurements. The results reveal that wettability alteration of carbonate rocks is achieved through PEG/SDS interaction on the rock surface above a critical aggregation concentration (CAC). The behaviour of PEG/SDS aqueous solutions is evaluated using surface and interfacial tension measurements. Furthermore, the effect of PEG and SDS concentrations and impact of electrolyte addition on PEG/SDS interaction are investigated. It is shown that electrolyte (NaCl) can effectively decrease the CAC values and accordingly initiate the wettability alteration of rocks. Moreover, in a constant SDS concentration, the addition of NaCl leads to a reduction in the contact angle, which can also be obtained by increasing the aging time, temperature and pre-adsorption of PEG on the rock surface.

Adsorption of Mixtures of a Pegylated Lipid with Anionic and Zwitterionic Surfactants at Solid/Liquid

“…This leads to a situation in which the hydrophilic charged head groups of the surfactant appear exposed to the aqueous phase, which may be considered similar to that what happens for the interaction of the cationic polymer poly(diallyl-dimethylammonium chloride), PDADMAC, and a neutral alkyl polyglucoside. This agrees with the findings by Heydari et al [66] for the interaction of PEG and SDS. At the highest surfactant concentrations, the micellization of the surfactant can be expected, which probably resulst in the formation of mixed DSPE-PEG + surfactant micelles with the PEG chains protruding to the solution.…”

“…However, the remarkably heterogeneity of the layers obtained upon deposition of mixtures of DSPE-PEG and different surfactant is detrimental for the tribological properties of the films, and consequently a careful examination of the composition of the mixtures and adsorption conditions should be required before trying a substitution of the PDADMAC for DSPE-PEG. It is reasonable to expect that the increase of the molecular weight of the PEG chain grafted to the phospholipid might increase the adsorption on the model surface [66].…”

Ламелярно-Ланцюгові Гідрогелі: Особливості Структури

“…To solve this problem, in this article, we consider a possible variant of creating a hydrogel based on polyethylene glycol (PEG) possessing a framework with increased rigidity. The properties of PEG-based hydrogels are widely discussed in the modern literature, in particular, concerning their possible application in industry (water vapor absorption [30], oil production [31], heating/cooling systems in buildings [32], and biomedical technologies (see works [33][34][35] and the references therein). PEG is an attractive material for tissue engineering, because, as a rule, it does not invoke an immune response [34], although this is not always the case [33].…”

Modified Two‐Phase Titration Methods to Quantify Surfactant Concentrations in Chemical‐Enhanced Oil Recovery Applications

“…Later wide varieties of surfactants such as anionic, cationic, nonionic, and zwitterionic have been used to improve oil displacement efficiency in tertiary recovery (Gbadamosi et al, 2019). Today EOR using wettability alterations is being tested in both conventional and unconventional applications (Das et al, 2019; Heydari et al, 2019; Kathel and Mohanty, 2018; Xu and Dehghanpour, 2014; Zeng et al, 2018). When surfactants are transported through a reservoir, some of it gets adsorbed (Zhang et al, 2019).…”