Phase behavior of systems comprising North Sea reservoir fluids and injection gases

Journal Article · Sat Nov 01 04:00:00 EST 1986 · J. Pet. Technol.; (United States)

DOI:https://doi.org/10.2118/12647-PA· OSTI ID:7041171

Varotsis, N; Stewart, G; Todd, A C; Claney, M

The design and use of an experimental system to measure the phase behavior of systems comprising reservoir fluids and injection gases are described. The experiments simulate in the laboratory the mass transfer between the advancing injection gas phase and the oil phase in the reservoir. A special feature of the equipment is the direct transfer of microliter samples of the equilibrium high pressure phases to the gas chromatograph, thus eliminating errors associated with conventional blowdown techniques. Then, the phase behavior simulator that has been developed is described briefly and its main features are discussed. The use of the Schmidt-Wenzel equation of state (EOS) has markedly improved the accuracy of the predicted liquid-phase densities at reservoir temperature, and corresponding state correlations are recommended for stock-tank oil volumes. Generalized correlations for the interaction parameters of CO/sub 2/-hydrocarbons, N/sub 2/-hydrocarbons, and CH/sub 4/-hydrocarbons have been developed from binary experimental data to be used with the Peng-Robinson equation. Temperature- and pressure-dependent coefficients were found to match saturation data with good accuracy. The phase behavior simulator, tuned on laboratory experimental data, was used to predict miscibility conditions for a North Sea stock-tank oil and a North Sea reservoir oil for CO/sub 2/ and N/sub 2/ injection schemes.

• Research Organization: Flopetrol-Johnston/Schlumberger
• OSTI ID: 7041171
• Journal Information: J. Pet. Technol.; (United States), Journal Name: J. Pet. Technol.; (United States) Vol. 38:12; ISSN JPTJA
• Country of Publication: United States
• Language: English

Related Subjects

02 PETROLEUM
020300* -- Petroleum-- Drilling & Production
ATLANTIC OCEAN
BENCH-SCALE EXPERIMENTS
CARBON DIOXIDE INJECTION
CHROMATOGRAPHY
ELEMENTS
ENERGY SOURCES
ENHANCED RECOVERY
EQUATIONS
EQUATIONS OF STATE
EQUILIBRIUM
FLUID INJECTION
FLUIDS
FOSSIL FUELS
FUELS
GAS CHROMATOGRAPHY
GAS INJECTION
GEOLOGIC DEPOSITS
MASS TRANSFER
MINERAL RESOURCES
MISCIBLE-PHASE DISPLACEMENT
NITROGEN
NONMETALS
NORTH SEA
OIL FIELDS
OIL WELLS
PETROLEUM
PETROLEUM DEPOSITS
PHASE STUDIES
PRESSURE DEPENDENCE
RECOVERY
RESERVOIR FLUIDS
RESERVOIR TEMPERATURE
RESOURCES
SEAS
SEPARATION PROCESSES
SOLUBILITY
STIMULATION
SURFACE WATERS
WELL STIMULATION
WELLS