Viscous oil recovery method

Details Viscous oil recovery method Viscous oil recovery method

1983-11-14

1986-07-01

Novosad, Stephen J.

Wells

Processes

Distinct, separate injection and producing wells

166263, E21B 4324

Patent

active

045974438

ABSTRACT:
In a thermal method for the recovery of oil from a subterranean, viscous oil-containing formation, a predetermined amount of steam in an amount not greater than 1.0 pore volume and an injection rate of 4 to 7 barrels of steam (cold water equivalent) per day per acre-foot of formation is injected into the formation via an injection well and oil is produced from the formation via a production well. The injection well is then shut-in for a variable time to allow the injected steam to dissipate its heat throughout the formation and reduce oil viscosity while continuing production of oil. Thereafter, a predetermined amount of hot water or low quality steam in an amount not greater than 1.0 pore volume is injected into the formation with continued production but avoiding steam breakthrough. Thereafter, production is continued until there is an unfavorable amount of water or steam in the fluids recovered.

REFERENCES:
patent: 3353598 (1967-11-01), Smith
patent: 3360045 (1967-12-01), Santourian
patent: 3483924 (1969-12-01), Blevins et al.
patent: 3572436 (1971-03-01), Riehl
patent: 3572437 (1971-03-01), Marberry et al.
patent: 4060129 (1977-11-01), Shu et al.
patent: 4121661 (1978-10-01), Redford
patent: 4450911 (1984-05-01), Shu et al.
patent: 4491180 (1985-01-01), Brown et al.

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