Surfactant system for the oil-wet sandstone of the North Burbank Unit

Conference · Wed Dec 31 23:00:00 EST 1975

OSTI ID:7299656

Boneau, D F; Clampitt, R L

Tertiary oil recoveries were compared for water-wet and oil-wet Berea sandstone cores (300-500 md permeability, 20-22 percent porosity). A coating of Dri-Film 104 (a polysiloxane polymer) was used in Berea cores to obtain the oil-wetting cores. The surfactant solution contained petroleum sulfonate (average equivalent weight 390 to 440), isobutanol, water, and 0.25 N sodium chloride in fresh Ark-Burbank water. The microemulsion was formed in situ with the ''reservoir'' crude. The mobility buffer contained Hi-Vis (partially hydrolyzed polyacrylamide) in water. The cores were saturated with synthetic Burbank brine, flooded with filtered Burbank crude (viscosity 3 cp at 120/sup 0/F, reservoir temperature), and then flooded with brine. A preflush of 0.25 N sodium chloride in fresh Ark-Burbank water was followed by the surfactant solution and the mobility buffer giving tertiary oil recoveries of 90-95 percent of residual oil from the water-wet cores and 55-65 percent from oil-wet cores. Adsorption of sulfonate onto the oil-wet cores was three to five times as great as onto the water-wet cores. A pilot field test is planned for the North Burbank Unit reservoir, Osage County, Oklahoma. The reservoir is an oil-wet sandstone with a porosity of 15.5 percent and a permeability of 24 md. The recovery is predicted to be about 12.5 percent (600,000 bbl) of the residual oil in the reservoir.

• OSTI ID: 7299656
• Country of Publication: United States
• Language: English

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