In-situ cementation for profile control

Compositions: coating or plastic – Coating or plastic compositions – Alkali metal silicate containing

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106634, 106638, 106802, 166261, 166270, 166272, 166292, 166293, 405266, 405267, C04B 1204, E21B 33138

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active

053585640

ABSTRACT:
A method and composition for controlling the profile of a formation where temperatures higher than 200.degree. F. are encountered. An aqueous solution of an organoammonium silicate, alkali metal or ammonium silicate is injected into a zone of higher permeability in a formation. Subsequently, a spacer volume of a water-immiscible organic solvent is directed into said zone. Afterwards, a water-miscible organic solvent containing an alkylpolysilicate is injected into the higher permeability zone. A silica cement is formed in-situ thereby substantially closing the higher permeability zone to fluid flow. Thereafter, a steam-flooding, water-flooding, carbon dioxide-flooding, or fire-flooding EOR operation is commenced in a lower permeability zone.

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