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

Journal Article · Sun May 01 04:00:00 EDT 1988 · SPE (Society of Petroleum Engineers) Reserv. Eng.; (United States)

OSTI ID:6681099

Flroozabadl, A; Nutakki, R; Wong, T W; Aziz, K

Two cubic equations of state (EOS) have been adopted to compute multicomponent two-phase compressibility, CO/sub 2//water and hydrocarbon/water phase behavior, and gas- and liquid-phase densities. The equations used in this paper are the Schmidt-Wenzel (SW) EOS and the Peng-Robinson (PR) EOS. While these cubic equations have the same form, the SW is reported to be more accurate for predicting hydrocarbon gas- and liquid-phase densities. 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. Our results show the expected sharp change in the compressibility during phase change. Such computations are required in some reservoir simulators.

• Research Organization: Stanford Univ. (US)
• OSTI ID: 6681099
• Journal Information: SPE (Society of Petroleum Engineers) Reserv. Eng.; (United States), Journal Name: SPE (Society of Petroleum Engineers) Reserv. Eng.; (United States) Vol. 3:2; ISSN SREEE
• Country of Publication: United States
• Language: English

Related Subjects

02 PETROLEUM
020300* -- Petroleum-- Drilling & Production
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CARBON DIOXIDE
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CHALCOGENIDES
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COMPRESSIBILITY
ENERGY SOURCES
ENHANCED RECOVERY
EQUATIONS
EQUATIONS OF STATE
FLUID FLOW
FLUID INJECTION
FLUIDS
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FUEL GAS
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HYDROGEN COMPOUNDS
INTERSTITIAL WATER
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NATURAL GAS
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ORGANIC COMPOUNDS
OXIDES
OXYGEN COMPOUNDS
PHASE STUDIES
RECOVERY
RESERVOIR FLUIDS
STIMULATION
TWO-PHASE FLOW
WATER
WELL STIMULATION
WELLS