Wells – Processes – Distinct – separate injection and producing wells
Patent
1984-02-16
1986-08-26
Suchfield, George A.
Wells
Processes
Distinct, separate injection and producing wells
166309, E21B 4324
Patent
active
046076956
ABSTRACT:
In a steam flood oil recovery process wherein the oil-containing formation has a natural brine salinity concentration within the range of 10 to 20% by weight, sweep efficiency is improved by injecting steam until steam breakthrough occurs at the production well after which a mixture of steam, a noncondensible gas, and a surfactant comprising a C.sub.12 alpha olefin sulfonate is injected into the formation. The C.sub.12 alpha olefin sulfonate forms a stable foam with the formation oil at formation conditions that reduces the permeability of the highly permeable steam swept zones thereby diverting the steam to other portions of the formation containing unswept oil. If the formation does not contain a natural brine salinity concentration, then the salinity of the mixture of steam, noncondensible and surfactant is controlled to a concentration of about 10% by weight by adding a salt thereto.
REFERENCES:
patent: 4086964 (1978-05-01), Dilgren et al.
patent: 4393937 (1983-07-01), Dilgren et al.
patent: 4444261 (1984-04-01), Islip
patent: 4488598 (1984-12-01), Duerksen
Gilman Michael G.
McKillop Alexander J.
Mobil Oil Corporation
Speciale Charles J.
Suchfield George A.
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