Wells – Processes – In situ combustion
Patent
1976-09-21
1978-02-07
Novosad, Stephen J.
Wells
Processes
In situ combustion
166292, E21B 4324, E21B 33138
Patent
active
040721914
ABSTRACT:
In an underground in situ combustion process for the recovery of oil from formations having high permeabilities, after combustion has been initiated, water containing a surfactant and air are injected under conditions such that the water upon contact with the hot formation vaporizes, creating slugs of condensible foam in an amount sufficient to generate a significant resistance factor of at least 5, which improves volumetric sweep efficiency by retarding the mobility of the steam and subsequent slugs of air. Air and water, including a surfactant, can be injected simultaneously as a mixture or as alternate slugs of water containing a surfactant and air.
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patent: 3905553 (1975-09-01), Bradley et al.
Novosad Stephen J.
Phillips Petroleum Company
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