Abstract:
The present invention relates to a method for enhanced oil recovery by flushing an underground formation, comprising the injection into the underground formation of an aqueous composition comprising microgels having at least one crosslinked polymer, characterized in that the polymer is crosslinked with at least one crosslinking agent capable of being degraded under the temperature conditions of the underground formation, and a content of crosslinking agent between 1 and 90 ppm per mole with respect to the total number of moles of monomer constituting the polymer.
Abstract:
A process for the treatment of a rock formation or cavity, including the step of injecting, into the rock formation or cavity, a water solution of a water-soluble thermo-thickening polymer, the thermo-thickening polymer being able to form a gel at a threshold temperature (Tg), an inner temperature (Tint) of the rock formation or cavity being equal or superior to the threshold temperature (Tg), the process being characterized in that the thermo-thickening polymer is a cellulose chain, partially etherified with C1-C6 alkyl or hydroxyalkyl groups, or a polyacrylamide-based copolymer including N-isopropylacrylamide and/or N-vinylpyrrolidone groups. Such a process is advantageous for water shutoff in gas- or oilfields, or to solve to water channelling problems between injection wells and production wells.
Abstract:
A method for limiting and/or preventing the migration of fines in a geological formation, in particular a subterranean formation, the method including bringing the formation into contact with one or more copolymers including at most 40 mol % of repeating units derived from a cationic monomer.
Abstract:
A process for the treatment of a rock formation or cavity, including the step of injecting, into the rock formation or cavity, a water solution of a water-soluble thermo-thickening polymer, the thermo-thickening polymer being able to form a gel at a threshold temperature (Tg), an inner temperature (Tint) of the rock formation or cavity being equal or superior to the threshold temperature (Tg), the process being characterized in that the thermo-thickening polymer is a cellulose chain, partially etherified with C1-C6 alkyl or hydroxyalkyl groups, or a polyacrylamide-based copolymer including N-isopropylacrylamide and/or N-vinylpyrrolidone groups. Such a process is advantageous for water shutoff in gas- or oilfields, or to solve to water channelling problems between injection wells and production wells.