Simplified method for computing phase behavior of crude oil-carbon dioxide mixtures

Thesis/Dissertation · Fri Jan 01 00:00:00 EST 1988

OSTI ID:5568841

Mohammed, S A.E.S.

Phase behavior plays a fundamental role in oil recovery processes, ranging from the production of gas condensate and volatile oil reservoirs to the injection of CO{sub 2} and N{sub 2} for enhanced oil recovery processes. In this study, a K-value method is developed. This method, expressed in a simple mathematical form, relates the equilibrium ratios of each component with its boiling temperature, critical temperature and pressure, and the mixture's pressure, convergence pressure and overall compositional changes. This method uses some experimental data for the mixture under study to adjust the form of the K-value expression. These experimental data are obtained from some of the routine PVT laboratory tests. A least squares-linear programming optimization routine is adopted to adjust the correlation to match the actual behavior of the mixtures with the calculated. Nine reservoir fluid samples were simulated, for retrograde gas condensate and five oil systems. The K-value method demonstrated good matches with the experimental data for all systems, including crude oil-carbon dioxide mixtures. In addition, the K-value method required less computer memory, less input data and fewer parameters to adjust than the equations of state. An approach for characterizing the heavy hydrocarbon fractions was developed as a combination of Ahmed's method, Whitson's method and Kay mixing rules. This approach was successfully used to split the heptanes-plus into pseudo components and estimate their properties.

• Research Organization: California Univ., Berkeley, CA (USA)
• OSTI ID: 5568841
• Resource Relation: Other Information: Thesis (Ph. D.)
• Country of Publication: United States
• Language: English

Related Subjects

02 PETROLEUM
CARBON DIOXIDE
PHASE STUDIES
CARBON DIOXIDE INJECTION
RESERVOIR ENGINEERING
OIL WELLS
PETROLEUM
BOILING POINTS
CALCULATION METHODS
COMPUTER CALCULATIONS
CRITICAL PRESSURE
CRITICAL TEMPERATURE
EQUATIONS OF STATE
EQUILIBRIUM
GAS CONDENSATES
MATHEMATICAL MODELS
MIXTURES
MOLECULAR WEIGHT
RESERVOIR FLUIDS
SIMULATION
CARBON COMPOUNDS
CARBON OXIDES
CHALCOGENIDES
CONDENSATES
DISPERSIONS
ENERGY SOURCES
ENGINEERING
EQUATIONS
FLUID INJECTION
FLUIDS
FOSSIL FUELS
FUELS
LIQUIDS
MISCIBLE-PHASE DISPLACEMENT
NATURAL GAS LIQUIDS
OXIDES
OXYGEN COMPOUNDS
PHYSICAL PROPERTIES
THERMODYNAMIC PROPERTIES
TRANSITION TEMPERATURE
WELLS
020300* - Petroleum- Drilling & Production