N/sub 2/-driven LPG achieves miscibitity at high temperatures

Journal Article · Mon Nov 01 04:00:00 EST 1982 · Pet. Eng. Int.; (United States)

OSTI ID:6133470

Carlisle, L; Crawford, P B; Montes, M Jr; Reeves, S

Shows that miscibility can be achieved at very low pressures above the critical temperature of propane. One can calculate the critical pressure and temperature for a variety of fluids of practical interest in achieving miscibility between the miscible slug and driving gas when applying enhanced oil recovery programs. A study of the critical properties of normally available reservoir fluids indicates that one method of achieving miscibility at lower pressures, even at high reservoir temperatures, might be to use LPG slugs pushed by nitrogen. Table gives the oil recovery for different LPG slug sizes when operating at a reservoir pressure of 2,000 psig and a reservoir temperature of 250F. Diagram shows the approximate critical temperature loci for ternary systems made up of 3 components from the group nitrogen, methane, ethane, and propane. By finding the desired reservoir temperature and then estimating the critical pressure required, one may select compositions and operating pressures required to achieve critical slug-driving gas mixtures for use in enhanced oil recovery programs. When using CO/sub 2/ for miscibility, the miscibility pressure increases with temperature. Use of LPG slugs results in a substantial reduction in the pressure required for miscibility.

• Research Organization: Texas Petroleum Research Committee, Texas A and M University, College Station, TX
• OSTI ID: 6133470
• Journal Information: Pet. Eng. Int.; (United States), Journal Name: Pet. Eng. Int.; (United States) Vol. 54:13; ISSN PEEID
• Country of Publication: United States
• Language: English

Related Subjects

02 PETROLEUM
020300* -- Petroleum-- Drilling & Production
ALKANES
CALCULATION METHODS
CARBON DIOXIDE INJECTION
CRITICAL TEMPERATURE
ELEMENTS
ENHANCED RECOVERY
ETHANE
FLUID INJECTION
FLUIDS
HIGH TEMPERATURE
HYDROCARBONS
LIQUEFIED GASES
LIQUEFIED PETROLEUM GASES
LIQUIDS
LOW PRESSURE
METHANE
MISCIBLE-PHASE DISPLACEMENT
NATURAL GAS LIQUIDS
NITROGEN
NONMETALS
ORGANIC COMPOUNDS
PETROLEUM PRODUCTS
PHYSICAL PROPERTIES
PRESSURE DEPENDENCE
PROPANE
RECOVERY
RESERVOIR FLUIDS
RESERVOIR PRESSURE
TEMPERATURE EFFECTS
THERMODYNAMIC PROPERTIES
TRANSITION TEMPERATURE