Wells – Processes – In situ combustion
Patent
1991-12-19
1993-05-18
Suchfield, George A.
Wells
Processes
In situ combustion
166270, 166272, 166292, 166293, E21B 33138, E21B 4324, E21B 43243
Patent
active
052112322
ABSTRACT:
A method for controlling the profile of a formation where temperatures higher than 200.degree. F. are encountered. Initially, an aqueous solution of an alkali metal hydroxide, ammonium hydroxide or organoammonium hydroxide is injected into a zone of greater permeability in a formation. Thereafter, a spacer volume of a water miscible organic solvent is injected into said zone. Afterwards, a water-miscible organic solvent containing an alkylpolysilicate is injected into the greater permeability zone. A silica cement is formed in-situ thereby substantially closing off the higher permeability zone to fluid flow. Thereafter, a steam-flooding, water-flooding, carbon dioxide stimulation or fire-flooding EOR operation is commenced in a lower permeability zone.
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Ng Ricky C.
Phelps Craig H.
Shu Paul
Hager G. W.
Malone C. A.
McKillop A. J.
Mobil Oil Corporation
Suchfield George A.
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