A group contribution activity coefficient model for enhanced oil recovery process involving electrolyte solutions: Part I-Solutions in the absence of partial molecular association

Conference · Sun Apr 01 04:00:00 EST 1984 · Soc. Pet. Eng. AIME, Pap.; (United States)

OSTI ID:6869643

Chien, M C.H.; Lee, S T

The assumption of ideal solution for the electrolyte solution in many mechanistic studies of enhanced oil recovery processes may be oversimplified because the mean ionic activity coefficient of an electrolyte is very sensitive to the mixture composition. A thermodynamic model is developed to account for the nonideality of electrolyte solutions and to serve as a tool for a more rigorous mechanistic study of enhanced oil recovery processes. The model takes into account three important molecular and ionic force contributions: the long range ion-ion electrostatic force contribution, the intermediate range ion-solvent interaction (solvation) contribution and the short range force contribution of all species. It is demonstrated that the model can correlate the solution behavior of strongly polar and nonpolar nonelectrolytes as well as strong electrolytes over a wide range of concentrations. The solvation contribution is found to be important in correlating the thermodynamic properties, especially, the salting out of nonelectrolytes in aqueous solutions. Comparison shows that the new model is four times better than Chen's model (1982) in correlating the mean ionic activity coefficients. The parameters of sodium chloride, sodium hydroxide and calcium cation as well as magnesium cation are determined in this study. These parameters will be useful for the mechanistic study of alkaline flooding processes and surfactant/polymer flooding processes. Furthermore, the model employs the group contribution concept. Therefore, it can be used to estimate the solution behavior of a mixture in which the groups can be identified.

• Research Organization: Gulf R and D Co.
• OSTI ID: 6869643
• Report Number(s): CONF-8304162-
• Conference Information: Journal Name: Soc. Pet. Eng. AIME, Pap.; (United States) Journal Volume: SPE/DOE 12717
• Country of Publication: United States
• Language: English

Related Subjects

02 PETROLEUM
020300* -- Petroleum-- Drilling & Production
ALKALI METAL COMPOUNDS
ALKALINE EARTH METAL COMPOUNDS
CALCIUM COMPOUNDS
CATIONS
CAUSTIC FLOODING
CHARGED PARTICLES
CHEMICAL COMPOSITION
CHEMICAL REACTIONS
CHLORIDES
CHLORINE COMPOUNDS
DISPLACEMENT FLUIDS
ELECTROLYTES
ENERGY SOURCES
ENHANCED RECOVERY
FLUID INJECTION
FLUIDS
FOSSIL FUELS
FUELS
HALIDES
HALOGEN COMPOUNDS
HYDROGEN COMPOUNDS
HYDROXIDES
IONS
MAGNESIUM COMPOUNDS
MATHEMATICAL MODELS
MICROEMULSION FLOODING
MISCIBLE-PHASE DISPLACEMENT
OIL WELLS
OXYGEN COMPOUNDS
PETROLEUM
PHYSICAL PROPERTIES
RECOVERY
SODIUM CHLORIDES
SODIUM COMPOUNDS
SODIUM HYDROXIDES
THERMODYNAMIC ACTIVITY
THERMODYNAMIC PROPERTIES
WATERFLOODING
WELLS