Surfactant retention in limestones

Wang, Denning

doi:10.26153/tsw/2005

Cited by 1 publication

(1 citation statement)

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“…In the base case, the pK A is 6 and the initial pH is 7, so the concentration of aqueous soap is 10 times that of aqueous acid. a K2i , the coefficient controlling the effect of pH on the adsorption constant, was estimated to be À0.15 from the combined data in Wang et al (2019) and Maubert et al (2018), compiled in Wang (2018). The surfactant retention in carbonate rocks decreases by a factor of approximately 1/3 when the pH is increased from 8 to 11.…”

Section: Effect Of Phmentioning

confidence: 99%

A new surfactant wettability alteration model for reservoir simulators

Chang

Pope

2023

J Surfact & Detergents

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Surfactants enhance oil recovery in naturally-fractured oil-wet rocks by wettability alteration and interfacial tension reduction. The oil-wet state is ascribed to the adsorption of soap on the rock surface. Soaps are the dissociated forms of carboxylic acids in the crude oil, that is, carboxylate surfactants. This paper describes a new mechanistic surfactant wettability alteration model that was developed for and implemented in a reservoir simulator. The model captures the geochemical reactions of acid/soap, the formation of mixed micelles, Henry's law adsorption, and the formation of cationic surfactant-anionic soap ion-pairs. A new wettability scaling factor is used to interpolate between the oil-wet and water-wet relative permeability and capillary pressure curves. The new model also accounts for the effect of salinity and pH, so it should also be useful for modeling lowsalinity flooding without surfactant. Previous surfactant wettability alteration models ignored the underlying mechanisms and were not predictive. Simulations of both static and dynamic imbibition were performed to better understand the key surfactant parameters and the dynamics of wettability alteration, microemulsion phase behavior, and interfacial tension reduction on oil recovery. Optimizing surfactant formulations for wettability alteration is discussed.

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Section: Effect Of Phmentioning

confidence: 99%