Wells – Processes – Cyclic injection then production of a single well
Patent
1989-12-29
1991-10-01
Suchfield, George A.
Wells
Processes
Cyclic injection then production of a single well
166272, 166274, 166303, E21B 4322, E21B 4324
Patent
active
050524879
ABSTRACT:
This invention provides a method for enhanced oil recovery which comprises two steps. In the first step, an oil-mobilizing agent comprising (a) a gas and an alkyl aromatic sulfonate or (b) an organic solvent is injected into the reservoir formation sufficient to reduce the oil concentration in at least a portion of the formation. Then in the second injection, steam and an oil-sensitive surfactant effective in forming a steam blocking foam in formations of lower oil concentration. Preferred oil-sensitive surfactants are alpha-olefin sulfonate dimer or alpha-olefin sulfonate surfactants used to form a foam in the oil depleted portions of the formation and to assist the movement of steam and hydrocarbons through the higher oil concentration portions of the formation. The stepwise enhanced recovery method of this invention provides increased efficiency by moving the higher concentration of oil through the formation with an organic solvent or with an alkyl aromatic sulfonate, then moving the lower concentrations of oil through the formation with the steam foam comprising alpha-olefin sulfonate dimer or alpha-olefin sulfonate surfactants.
REFERENCES:
patent: 3608638 (1971-09-01), Terwilliger
patent: 3946810 (1976-03-01), Barry
patent: 4086964 (1978-05-01), Dilgren et al.
patent: 4127170 (1978-11-01), Redford
patent: 4161217 (1979-07-01), Dilgren et al.
patent: 4393937 (1983-07-01), Dilgren et al.
patent: 4556107 (1985-12-01), Duerksen et al.
patent: 4576232 (1986-03-01), Duerksen et al.
patent: 4607700 (1986-08-01), Duerksen et al.
patent: 4682653 (1987-07-01), Angstadt
patent: 4697642 (1987-10-01), Vogel
Chevron Research & Technology Company
Suchfield George A.
LandOfFree
Sequential injection foam process for enhanced oil recovery does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Sequential injection foam process for enhanced oil recovery, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Sequential injection foam process for enhanced oil recovery will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-1748317