Aqueous flooding methods for tertiary oil recovery

Patent · 31 December 1988

OSTI ID:866900

Peru, Deborah A ^[1]

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1. Bartlesville, OK

A method of aqueous flooding of subterranean oil bearing formation for tertiary oil recovery involves injecting through a well into the formation a low alkaline pH aqueous sodium bicarbonate flooding solution. The flooding solution's pH ranges from about 8.25 to 9.25 and comprises from 0.25 to 5 weight percent and preferably about 0.75 to 3.0 weight percent of sodium bicarbonate and includes a petroleum recovery surfactant of 0.05 to 1.0 weight percent and between 1 and 20 weight percent of sodium chloride. After flooding, an oil and water mixture is withdrawn from the well and the oil is separated from the oil and water mixture.

• Research Organization: IIT Research Institute (Chicago, IL)
• DOE Contract Number: FC22-83FE60149
• Assignee: IIT Research Institute (Chicago, IL)
• Patent Number(s): US 4817715
• OSTI ID: 866900
• Country of Publication: United States
• Language: English

Related Subjects

/166/507/
05
20
25
75
alkaline
alkaline ph
aqueous
aqueous flooding
aqueous sodium
bearing
bearing formation
bicarbonate
chloride
comprises
flooding
formation
injecting
involves
involves injecting
method
methods
mixture
oil
oil bearing
oil recovery
percent
petroleum
petroleum recovery
ph
ph aqueous
ph range
preferably
ranges
recovery
separated
sodium
sodium bicarbonate
sodium chloride
solution
subterranean
subterranean oil
surfactant
tertiary
tertiary oil
water
water mixture
weight
weight percent
withdrawn