Heavy oil recovery process using cyclic carbon dioxide steam sti

Details Heavy oil recovery process using cyclic carbon dioxide steam sti Heavy oil recovery process using cyclic carbon dioxide steam sti

1984-09-20

1986-01-21

Suchfield, George A.

Wells

Processes

Heating, cooling or insulating

E21B 4324

Patent

active

045652490

ABSTRACT:
A method for the recovery of viscous oil from subterranean formations including tar sands by the injection of a mixture of carbon dioxide and steam into the formation through an injection well, after which formation fluids are recovered from the well in a cyclic manner, using the well alternately for injection and production. Incremental recovery is optimized by maintaining the ratio of carbon dioxide to steam within the range 200 to 300, preferably 230 to 270 SCF carbon dioxide per barrel of steam (with water equivalent) in the injected mixture.

REFERENCES:
patent: 3477510 (1969-11-01), Spillette
patent: 3782470 (1974-01-01), West et al.
patent: 4085803 (1978-04-01), Butler
patent: 4099568 (1978-07-01), Allen
patent: 4217956 (1980-08-01), Goss et al.
patent: 4257650 (1981-03-01), Allen
patent: 4271905 (1981-06-01), Redford et al.
patent: 4429745 (1984-02-01), Cook

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