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Title: Interpretation of the change in optimal salinity with overall surfactant concentration

Abstract

For chemical flooding formulations, optimal salinity changes with overall surfactant concentration when the phase behavior is observed in test tubes. Applying these observations to the mathematical simulator is questionable because chromatographic mechanisms during displacement through porous media result in different compositions. This work sought the mechanism for the observed change so that calculated optimal salinity can be expressed through the appropriate intensive variable rather than overall surfactant concentration. Association of the alcohol has been described by partition coefficients for distribution of the alcohol among brine, oil, and surfactant. The alcohol was isopropanol (IPA), 1-butanol (NBA), or tertiary amyl alcohol (TAA) in the systems in which they were included and was used to represent a disulfonate in the system with Petrostep petroleum sulfonate. Association of sodium and divalent ions with surfactant has been described by the Donnan equilibrium model, which experimental observations show can be applied to microemulsions as well as to micelles. For the seven systems investigated, the change in optimal salinity is a function of (1) the alcohol associated with the surfactant and (2) the divalent ion fraction of the associated counterions.

Authors:
Publication Date:
OSTI Identifier:
5899066
Resource Type:
Journal Article
Journal Name:
Soc. Pet. Eng. AIME, Pap.; (United States)
Additional Journal Information:
Journal Volume: 22:6
Country of Publication:
United States
Language:
English
Subject:
02 PETROLEUM; 37 INORGANIC, ORGANIC, PHYSICAL AND ANALYTICAL CHEMISTRY; MICROEMULSION FLOODING; BENCH-SCALE EXPERIMENTS; MICROEMULSIONS; SALINITY; SURFACTANTS; ALCOHOLS; CHROMATOGRAPHY; DONNAN THEORY; ENHANCED RECOVERY; MISCIBLE-PHASE DISPLACEMENT; OIL WELLS; PARTITION; PETROLEUM; PETROLEUM SULFONATES; PHASE STUDIES; POROUS MATERIALS; SODIUM IONS; CHARGED PARTICLES; COLLOIDS; DISPERSIONS; EMULSIONS; ENERGY SOURCES; ESTERS; FLUID INJECTION; FOSSIL FUELS; FUELS; HYDROXY COMPOUNDS; IONS; MATERIALS; ORGANIC COMPOUNDS; ORGANIC SULFUR COMPOUNDS; RECOVERY; SEPARATION PROCESSES; SULFONATES; SULFONIC ACID ESTERS; WELLS; 020300* - Petroleum- Drilling & Production; 400301 - Organic Chemistry- Chemical & Physicochemical Properties- (-1987)

Citation Formats

Hirasaki, G J. Interpretation of the change in optimal salinity with overall surfactant concentration. United States: N. p., 1982. Web. doi:10.2118/10063-PA.
Hirasaki, G J. Interpretation of the change in optimal salinity with overall surfactant concentration. United States. doi:10.2118/10063-PA.
Hirasaki, G J. Wed . "Interpretation of the change in optimal salinity with overall surfactant concentration". United States. doi:10.2118/10063-PA.
@article{osti_5899066,
title = {Interpretation of the change in optimal salinity with overall surfactant concentration},
author = {Hirasaki, G J},
abstractNote = {For chemical flooding formulations, optimal salinity changes with overall surfactant concentration when the phase behavior is observed in test tubes. Applying these observations to the mathematical simulator is questionable because chromatographic mechanisms during displacement through porous media result in different compositions. This work sought the mechanism for the observed change so that calculated optimal salinity can be expressed through the appropriate intensive variable rather than overall surfactant concentration. Association of the alcohol has been described by partition coefficients for distribution of the alcohol among brine, oil, and surfactant. The alcohol was isopropanol (IPA), 1-butanol (NBA), or tertiary amyl alcohol (TAA) in the systems in which they were included and was used to represent a disulfonate in the system with Petrostep petroleum sulfonate. Association of sodium and divalent ions with surfactant has been described by the Donnan equilibrium model, which experimental observations show can be applied to microemulsions as well as to micelles. For the seven systems investigated, the change in optimal salinity is a function of (1) the alcohol associated with the surfactant and (2) the divalent ion fraction of the associated counterions.},
doi = {10.2118/10063-PA},
journal = {Soc. Pet. Eng. AIME, Pap.; (United States)},
number = ,
volume = 22:6,
place = {United States},
year = {1982},
month = {12}
}