EOS predictions of compressibility and phase behavior in systems containing water, hydrocarbons, and CO/sub 2/

Conference · Wed Jan 01 04:00:00 EST 1986

OSTI ID:7076957

Firoozabadi, R; Nutakki, R; Wong, T; Aziz, K

Cubic equations of state (EOS) have been adopted to compute multicomponent two-phase compressibility as well as CO/sub 2/-water and hydrocarbon-water phase behavior. The equations used in this paper are: Schmidt-Wenzel (SW), and Peng-Robinson (PR). While these cubic equations have the same form, SW is reported to be more accurate for predicting hydrocarbon gas and liquid phases density. Density predictions are compared with experimental data to confirm the superiority of the SW-EOS. The use of EOS to predict equilibrium phase compositions of water-hydrocarbon and water-CO/sub 2/ systems is discussed. For the water-hydrocarbon systems, the aqueous phase interaction coefficient between water and the dissolved component shows a strong temperature dependency while in the gas phases a constant value of interaction coefficient is adequate. In the case of the CO/sub 2/-water systems, the interaction coefficients for both the aqueous and gas phases show temperature dependency. A scheme to compute the two-phase compressibility of multicomponent reservoir fluid systems is also introduced. The results show the expected sharp change in the compressibility during phase change. Such computations are required in some reservoir simulators.

• Research Organization: Stanford Univ.
• OSTI ID: 7076957
• Report Number(s): CONF-861080-
• Country of Publication: United States
• Language: English

Related Subjects

02 PETROLEUM
020200* -- Petroleum-- Reserves
Geology
& Exploration
03 NATURAL GAS
030200 -- Natural Gas-- Reserves
Geology
& Exploration
CARBON COMPOUNDS
CARBON DIOXIDE
CARBON OXIDES
CHALCOGENIDES
CHEMICAL COMPOSITION
COMPARATIVE EVALUATIONS
COMPRESSIBILITY
DENSITY
DISSOLUTION
EQUATIONS
EQUATIONS OF STATE
FLUID FLOW
FLUIDS
GROUND WATER
HYDROCARBONS
HYDROGEN COMPOUNDS
INTERACTIONS
INTERSTITIAL WATER
MECHANICAL PROPERTIES
ORGANIC COMPOUNDS
OXIDES
OXYGEN COMPOUNDS
PHASE STUDIES
PHASE TRANSFORMATIONS
PHYSICAL PROPERTIES
RESERVOIR FLUIDS
SIMULATION
TEMPERATURE DEPENDENCE
TWO-PHASE FLOW
WATER