Phase behavior and minimum miscibility pressures for nitrogen miscible displacement: Topical report

Technical Report · Sun Mar 01 04:00:00 EST 1987

OSTI ID:6759664

Llave, Feliciano M; Chung, Ting-Horng

The phase behavior and minimum miscibility pressure (MMP) for nitrogen with light oils were studied. The phase behavior studies were performed on N/sub 2/ + hydrocarbon mixtures as well as N/sub 2/ + recombined oil systems at high pressures (above 4,000 psia). The synthetic oil system of N/sub 2/ + C/sub 1/ + C/sub 4/ + C/sub 10/ was studied to approximate the phase behavior of crude oils with nitrogen and to investigate the effect of the presence of methane on phase behavior and N/sub 2/ MMP values. The phase behavior data are used in a computer simulator to match the slim tube displacement behavior and to provide an estimate of the MMP. The N/sub 2/ + recombined oil studies provide the complex behavior of multicomponent systems. Adjustment of parameters to predict the phase envelope has been made in order to use these parameters in equations-of-state (EOS) for predictions at various reservoir conditions. This provides a cross-check of the conditions of miscibility achieved during the slim tube experiments. Experimental runs were performed in a slim tube apparatus to determine the MMP of stock-tank oils with nitrogen, recombined oils, and synthetic oils at pressures up to 10,000 psia and temperatures from 200 to 300 F. These experiments were performed using stock-tank oils with API gravities of 50.8/sup 0/ and 61.5/sup 0/, recombined at different gas-oil ratios (GOR). The experimental results indicate the important contribution of light and intermediate components of crude oil in decreasing the MMP and show the variation in oil recovery as a function of temperature. Similar N/sub 2/ MMP tests were performed on two synthetic mixtures containing C/sub 1/, C/sub 2/, C/sub 3/, C/sub 4/, C/sub 5/, C/sub 6/, C/sub 7/, C/sub 8/, C/sub 9/, C/sub 10/, and C/sub 12/. These studies will provide useful information for the implementation of the N/sub 2/ miscible displacement process. 26 refs., 28 figs., 7 tabs.

• Research Organization: National Inst. for Petroleum and Energy Research, Bartlesville, OK (USA)
• DOE Contract Number: FC22-83FE60149
• OSTI ID: 6759664
• Report Number(s): NIPER-226; ON: DE87001229
• Country of Publication: United States
• Language: English

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ALKANES
BENCH-SCALE EXPERIMENTS
BUTANE
DATA
DECANE
DIAGRAMS
DISPERSIONS
DODECANE
ELEMENTS
ENERGY SOURCES
ENHANCED RECOVERY
EQUATIONS
EQUATIONS OF STATE
EQUILIBRIUM
ETHANE
EXPERIMENTAL DATA
FLUID INJECTION
FLUIDS
FOSSIL FUELS
FUELS
GASES
HEPTANE
HEXANE
HIGH PRESSURE
HIGH TEMPERATURE
HYDROCARBONS
INFORMATION
LIQUIDS
MEDIUM PRESSURE
MEDIUM TEMPERATURE
METHANE
MISCIBLE-PHASE DISPLACEMENT
MIXTURES
NITROGEN
NONMETALS
NUMERICAL DATA
OIL WELLS
ORGANIC COMPOUNDS
PENTANE
PETROLEUM
PHASE DIAGRAMS
PHASE STUDIES
PRESSURE DEPENDENCE
PROPANE
RECOVERY
TEMPERATURE DEPENDENCE
VAPORS
WELLS