Miscible flood to recover extra 100 million bbl. [Alberta]
A miscible flood began in 1973 in the S. Swan Hills oil reservoir in N.-central Alberta, Canada, is expected to recover 100 million bbl of oil more than could have been recovered with waterflooding. The carbonate reef had an estimated 890 million bbl of oil originally in place. The field was discovered in 1959. A waterflood was started along the SW. edge of the field in 1963. Production increased from 14,000 bpd in 1963 to 50,000 bpd in 1972, and totaled 96 million bbl by the end of 1972. A miscible-recovery program, put into operation in the central portion of the reservoir in 1973, involves injecting an enriched hydrocarbon-gas volume equal to 10% of the pore volume as the solvent. Engineering studies have indicated that a hydrocarbon miscible flood using alternate solvent-water injection could increase oil recovery to 65%. After 18 mo. of operation, 29 million reservoir barrels of enriched gas have been injected together with 23 million bbl of water and the preinjected water, accounting altogether for 8.8% of the reservoir pore volume. To date, some breakthrough of injected fluid has occurred.
- Research Organization:
- Amoco Canada Petroleum Co.
- OSTI ID:
- 6669958
- Journal Information:
- Oil Gas J.; (United States), Journal Name: Oil Gas J.; (United States) Vol. 73:21; ISSN OIGJA
- Country of Publication:
- United States
- Language:
- English
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