A generalized method for predicting gas/oil miscibility

Journal Article · Mon Sep 01 04:00:00 EDT 1986 · SPE (Society of Petroleum Engineers) Reserv. Eng.; (United States)

DOI:https://doi.org/10.2118/12346-PA· OSTI ID:5196625

Emanuel, A S; Behrens, R A; McMillen, T J

An equilibrium-cell simulator provides reliable estimates of gas/oil minimum miscibility pressure (MMP) with a correlation of residual oil against capillary number. The basic flash calculations of the equilibrium cell are supplemented by a number of PVT and fluid-flow modeling techniques that provide a reasonable simulation of slim-tube performance. A PVT stability calculation has been incorporated as an option for systems where flash convergence is difficult. Interfacial tension (IFT) may be calculated either by the method of parachors or by method based on critical-point scaling theory. An experimental correlation is presented for residual oil reduction with capillary number. The relative permeabilities are varied between the fully miscible bounds as a function of capillary number. The slim-tube recovery results have been calibrated against 110 experimental runs for 21 different oils. Recovery by hydrocarbon gas is generally predicted within 10%; recovery by N/sub 2/ and CO/sub 2/ is generally predicted to within 15%. The program logic is designed to be most accurate in the miscible region. The simulator will typically give a priori estimate of MMP within 10% and show the relative effects of changes in injection gas composition and system pressure. The simulator may be calibrated to an experimental recovery point . An oil specific calibration gives much higher accuracy than the predictions that use the default parameters.

• Research Organization: Chevron Oil Field Research Co., La Habra, CA
• OSTI ID: 5196625
• Journal Information: SPE (Society of Petroleum Engineers) Reserv. Eng.; (United States), Journal Name: SPE (Society of Petroleum Engineers) Reserv. Eng.; (United States) Vol. 1:5; ISSN SREEE
• Country of Publication: United States
• Language: English

Related Subjects

02 PETROLEUM
020300* -- Petroleum-- Drilling & Production
ACCURACY
ANALOG SYSTEMS
CAPILLARY FLOW
CARBON COMPOUNDS
CARBON DIOXIDE
CARBON DIOXIDE INJECTION
CARBON OXIDES
CHALCOGENIDES
CHEMICAL COMPOSITION
DATA ANALYSIS
ELEMENTS
ENERGY SOURCES
ENHANCED RECOVERY
FLOW MODELS
FLUID FLOW
FLUID INJECTION
FLUIDS
FOSSIL FUELS
FUEL GAS
FUELS
FUNCTIONAL MODELS
GAS FUELS
GAS INJECTION
GASES
MATHEMATICAL MODELS
MISCIBLE-PHASE DISPLACEMENT
NATURAL GAS
NITROGEN
NONMETALS
OIL WELLS
OIL YIELDS
OXIDES
OXYGEN COMPOUNDS
PERMEABILITY
PETROLEUM
PRESSURE MEASUREMENT
RECOVERY
RESIDUAL PETROLEUM
SIMULATORS
SOLUBILITY
STABILITY
STIMULATION
SURFACE PROPERTIES
SURFACE TENSION
TEMPERATURE MEASUREMENT
VOLUME
WELL STIMULATION
WELLS
YIELDS