Correlation of minimum miscibility pressure for impure CO/sub 2/ streams

Conference · Sun Apr 01 04:00:00 EST 1984 · Soc. Pet. Eng. AIME, Pap.; (United States)

OSTI ID:6554781

Sebastian, H M; Renner, T A; Wenger, R S

The displacement efficiency of oil by carbon dioxide is highly pressure dependent and miscible displacement efficiency is only achieved at pressures greater than a certain minimum. This minimum miscibility pressure (MMP) is a function of temperature and composition of the injection gas. The study presented in this paper examines the effect on MMP of up to 55 mole percent impurities in the CO/sub 2/-rich injection gas. A correlation of these data was developed based on the mole average pseudocritical temperature (TCM) of the gas and the minimum miscibility pressure of pure CO/sub 2/ with the same oil at the same conditions. In general, it was found that increasing the TCM of the gas lowered the MMP and decreasing the TCM increased the MMP. Injection gases with the same TCM but very different compositions were found to have the same MMP. Various correlating parameters were tried but TCM was found to be the most suitable. This correlation is compared to others in the literature and found to be superior in the case where the drive gas contained both light and intermediate components. The correlation indicates that miscibility in a field-wide CO/sub 2/ flood may be maintained by reinjection of impure CO/sub 2/ streams if sufficient intermediate hydrocarbons are present in the produced gas to offset the effects of lighter gases. Since CO/sub 2/ cleanup is one of the major costs in fieldwide CO/sub 2/ flooding, reduction or complete elimination of produced gas cleanup will have a significant positive impact on process economics. The operational and regulatory aspects of injecting an impure CO/sub 2/ stream must be considered, however, in order to optimize the recycling scheme.

• Research Organization: Amoco Production Co.
• OSTI ID: 6554781
• Report Number(s): CONF-8304162-
• Conference Information: Journal Name: Soc. Pet. Eng. AIME, Pap.; (United States) Journal Volume: SPE/DOE 12648
• Country of Publication: United States
• Language: English

Related Subjects

02 PETROLEUM
020300* -- Petroleum-- Drilling & Production
CARBON COMPOUNDS
CARBON DIOXIDE
CARBON DIOXIDE INJECTION
CARBON OXIDES
CHALCOGENIDES
CONTROL
CORRELATIONS
DISPLACEMENT FLUIDS
ENHANCED RECOVERY
FLUID INJECTION
FLUID WITHDRAWAL
FLUIDS
GAS INJECTION
IMPURITIES
MISCIBLE-PHASE DISPLACEMENT
OIL WELLS
OXIDES
OXYGEN COMPOUNDS
PRESSURE CONTROL
PRESSURE DEPENDENCE
RECOVERY
RESERVOIR FLUIDS
WELLS