Steam-channel-expanding steam foam drive

Details Steam-channel-expanding steam foam drive Steam-channel-expanding steam foam drive

1977-05-27

1978-05-02

Novosad, Stephen J.

Wells

Processes

Distinct, separate injection and producing wells

166252, 166274, E21B 4324

Patent

active

040869644

ABSTRACT:
In a viscous oil reservoir in which the stratification of the rock permeability is insufficient to confine steam within the most permeable strata, oil can be produced by forming and expanding a steam channel through which steam is flowed and oil is produced. Steam is injected and fluid is produced at rates causing a steam channel to be extended between locations that are horizontally separated. A foam-forming mixture of steam, noncondensable gas and surfactant is then injected into the steam channel to provide foam and a relatively high pressure gradient within the channel, without plugging the channel. A flow of steam-containing fluid through the steam channel is continued in a manner such that the magnitudes of the pressure gradient, the rate of oil production, and the rate of steam channel expansion exceed those which could be provided by steam alone.

REFERENCES:
patent: 3367419 (1968-02-01), Lookeren
patent: 3412793 (1968-11-01), Needham
patent: 3706341 (1972-12-01), Redford
patent: 3771598 (1973-11-01), McBean
patent: 3796262 (1974-03-01), Allen et al.
patent: 3847219 (1974-11-01), Wang et al.
patent: 3948323 (1976-04-01), Sperry et al.
patent: 3994345 (1976-11-01), Needham

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