Selection criteria and formation of a surfactant slug for high-temperature, moderate salinity reservoir conditions
The main objective of this investigation was to formulate a surfactant system for a waterflooded reservoir at 80 C and having a salinity in the range of 20 to 30 g/L. The equivalent alkane carbon number (EACN) of the crude oil at 80 C was found to be 9.3 as determined by a comparison of its optimal salinity with those of pure hydrocarbon oils. Isopropyl alcohol, isobutyl alcohol, secondary butyl alcohol, and tertiary amyl alcohol (TAA) were employed as cosolvents. The optimal salinity at 80 C of a petroleum sulfonate (TRS10-80), crude oil and any of the above alcohol containing system was found to be less than 1.3%. A phosphated ester (KF AA-270) was used as a cosurfactant with TRS10-80 in the weight ratio of 2/5 which increased the optimal salinity in the range of 25 to 35 g/L. However, the addition of this cosurfactant decreased the solubilization parameters drastically. In order to improve the solubilization of brine and oil in the middle phase microemulsion, inorganic salts such as Na2CO3 and sodium tripolyphosphate were added to the formulation. 37 references.
- OSTI ID:
- 5907508
- Report Number(s):
- CONF-8306242-
- Journal Information:
- Soc. Pet. Eng. AIME, Pap.; (United States), Journal Name: Soc. Pet. Eng. AIME, Pap.; (United States) Vol. SPE-11772; ISSN SEAPA
- Country of Publication:
- United States
- Language:
- English
Similar Records
Effects of single and mixed alkanes on interfacial properties, solubilization in microemulsions and the oil displacement process
Interpretation of the change in optimal salinity with overall surfactant concentration
Related Subjects
020300* -- Petroleum-- Drilling & Production
ALKALI METAL COMPOUNDS
CARBON COMPOUNDS
CARBONATES
COLLOIDS
DISPERSIONS
EMULSIONS
ENERGY SOURCES
ENHANCED RECOVERY
ESTERS
FLUID INJECTION
FOSSIL FUELS
FUELS
MICROEMULSIONS
OIL WELLS
ORGANIC COMPOUNDS
ORGANIC SULFUR COMPOUNDS
OXYGEN COMPOUNDS
PETROLEUM
PETROLEUM SULFONATES
PHOSPHATES
PHOSPHORUS COMPOUNDS
RECOVERY
RESERVOIR ROCK
SALINITY
SODIUM CARBONATES
SODIUM COMPOUNDS
SODIUM PHOSPHATES
SULFONATES
SULFONIC ACID ESTERS
SURFACTANTS
TEMPERATURE DEPENDENCE
WATERFLOODING
WELLS