Wells – Processes – Distinct – separate injection and producing wells
Patent
1988-05-24
1989-08-01
Suchfield, George A.
Wells
Processes
Distinct, separate injection and producing wells
166 91, 166274, 166275, 252 8554, F21B 4322
Patent
active
048526525
ABSTRACT:
A caustic waterflooding process for enhanced oil recovery from a production well is disclosed comprising injection of an aqueous solution under pressure to sweep oil to the production well. That aqueous solution comprises a caustic and a polymer that has an intrinsic viscosity that is at least twice as high in its hydrolyzed form than in its unhydrolyzed form, wherein the polymer is injected with less than 15% of polymer being hydrolyzed. The aqueous solution contains from 100 to 5,000 ppm of polymer and 100 to 50,000 ppm of caustic. Such solutions have improved injectivity and good efficiency in recovering oil from underground formations.
Preferably, the polymer is injected with from 5% to 10% of polymer being hydrolyzed. That polymer is preferably a polyacrylamide (such as a polyacrylamide homopolymer, a polymethylacrylamide homopolymer, or a copolymer of acrylamide and monomers selected from the group consisting of methylacrylamide, N-alkyl-substituted acrylamides, alkylacrylates, and acrylic acids).
REFERENCES:
patent: 2827964 (1958-03-01), Sandiford et al.
patent: 3208518 (1961-07-01), Patton
patent: 3502146 (1970-03-01), Hurd
patent: 3743018 (1973-07-01), Norton et al.
patent: 3768560 (1973-10-01), Hill et al.
patent: 3825067 (1974-07-01), Vestal
patent: 3827499 (1974-08-01), Norton et al.
patent: 3841399 (1974-10-01), Ryan
patent: 3842909 (1974-10-01), Rhudy et al.
patent: 3888309 (1975-06-01), Rhudy et al.
patent: 3927716 (1975-12-01), Burdyn et al.
patent: 3977470 (1976-08-01), Chang
patent: 4040484 (1977-08-01), Hessert
patent: 4049054 (1977-09-01), Wier
patent: 4249608 (1981-02-01), Carter
patent: 4282930 (1981-08-01), Grodde et al.
patent: 4291765 (1981-09-01), Gilchrist et al.
patent: 4409110 (1983-10-01), Borchardt et al.
patent: 4447342 (1984-05-01), Borchardt et al.
patent: 4493371 (1985-01-01), Reisberg et al.
patent: 4510993 (1985-04-01), Luetzelschwab
patent: 4574885 (1986-03-01), Horton
patent: 4638865 (1987-01-01), Ball et al.
patent: 4653584 (1987-03-01), Ball et al.
patent: 4667740 (1987-05-01), Maddox, Jr.
patent: 4709759 (1987-12-01), Bock et al.
SPE of AIME Rocky Mountain Regional Meeting Preprint No. SPE-5339, 8 pp., 1975.
Chevron Research Company
Keeling E. J.
LaPaglia S. R.
Schaal E. A.
Suchfield George A.
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