Abstract: The invention relates to a composition C which comprises, in an aqueous medium M: surfactants suitable for creating a foam in the presence of a gas; and polymers P based on acrylamide or acrylamido units, having a molecular mass of 1,000,000 to 20,000,000 g/mol; or: composition C has a viscosity of less than 6 mPa·s; and the content of polymer P is greater than the concentration limit beyond which the apparent viscosity of a foam obtained from composition C is greater by at least 10% than the apparent viscosity of a foam obtained from the same composition but deprived of polymers. The invention further relates to the use of these compositions as foaming compositions for EOR.

Abstract: The present invention relates to the preparation of polymers that are of use in particular as a rheology agent, and are suitable for use in very concentrated saline media, which comprises a step of micellar radical polymerization in which are brought into contact, in an aqueous medium: —hydrophilic monomers; —hydrophobic monomers in the form of a micellar solution, containing micelles comprising these hydrophobic monomers; —a radical polymerization initiator; and —preferably an agent for controlling radical polymerization, wherein said micelles comprise at least one surfactant of amphoteric nature. The polymers obtained according to the invention are in particular of use for enhanced oil recovery.

Abstract: Compositions suitable for enhanced oil recovery comprising a) a mixture of ?-sulfocarbonyl compounds of formulae (1) and (2) in a mixture ratio (1) to (2) of from 1:99 to 99:1 wherein R1, R3 and R5, which may be the same or different at each occurrence, are hydrogen or a linear or branched alkyl chain having 1 to 20 carbon atoms, R2 and R4, which may be the same or different at each occurrence, may be a linear or branched alkyl group having 4 to 24 carbon atoms and in which the alkyl chain may comprise one or more cycloaliphatic groups, and X is H or a metal forming a salt with the sulfonate group, and b) a salt containing aqueous solution.

Abstract: The invention relates to a composition which comprises within an aqueous medium: —at least one ethoxylated alkylamine; and—at least one amphoteric or zwitterionic surfactant. The invention further relates to the use of said compositions as foaming compositions, in particular for EOR (enhanced oil recovery).

Abstract: An aqueous formulation for enhanced oil recovery may include at least one surfactant and at least one associative polymer. The associative polymer may be obtained by micellar radical polymerization by bringing into contact, in an aqueous medium, hydrophilic monomer dissolved in the aqueous medium, hydrophobic monomers in the form of a micellar solution, at least one radical polymerization initiator, and preferably at least one radical polymerization control agent.

Abstract: An aqueous formulation for enhanced oil recovery may include at least one surfactant and at least one associative polymer. The associative polymer may be obtained by micellar radical polymerization by bringing into contact, in an aqueous medium, hydrophilic monomer dissolved in the aqueous medium, hydrophobic monomers in the form of a micellar solution, at least one radical polymerization initiator, and preferably at least one radical polymerization control agent.

Abstract: The invention relates to a composition C which comprises, in an aqueous medium M: surfactants suitable for creating a foam in the presence of a gas; and polymers P based on acrylamide or acrylamido units, having a molecular mass of 1,000,000 to 20,000,000 g/mol; or: composition C has a viscosity of less than 6 mPa·s; and the content of polymer P is greater than the concentration limit beyond which the apparent viscosity of a foam obtained from composition C is greater by at least 10% than the apparent viscosity of a foam obtained from the same composition but deprived of polymers. The invention further relates to the use of these compositions as foaming compositions for EOR.

Abstract: The instant invention concerns the use of a compound of formula R1R2N—(CH2)m?NR3—(CH2)m??NR4R5 wherein each of m and m? is 1, 2, 3 or 4; and each of R1, R2, R3, R4 and R5 is a group of formula —[O—CH2—CH(—CH3)—]n—[O—CH2—CH2]p—OH, wherein n is from 2 to 30; and p is from 5 to 50 for decreasing or inhibiting the anionic-surfactant retention phenomena in an oil reservoir.

Abstract: The present invention relates to compositions for enhanced oil recovery, comprising: (A) internal ketones sulfonated alpha to the ketone group; and (B) unsulfonated internal ketones, with a molar ratio B/(A+B) greater than or equal to the limiting molar concentration of unsulfonated ketones from which a stabilization is observed in the reduction in mobility when the mixture of said ketones is injected into a porous medium.

Abstract: The invention relates to aqueous formulations suitable as extraction fluid in enhanced oil recovery, which comprise: at least one surfactant; and at least one associative polymer, such as obtained by micellar radical polymerization by bringing into contact, in an aqueous medium: hydrophilic monomers, dissolved or dispersed in the aqueous medium; hydrophobic monomers in the form of a micellar solution; and at least one radical polymerization initiator; and preferably at least one radical polymerization control agent.

Abstract: The instant invention relates to surfactants having the following formula (I) wherein: each of Ra and Rb is a linear or branched, saturated or unsaturated, hydrocarbon chain, each of Rc and Rd is a alkyl chain having 1 to 10 carbon atoms, each of (E1) and (E2) is a divalent hydrocarbon radical, A is: a group a carboxylate group —COO? (optionally in all or part in the form —COOH); or a sulfonate group —SO3? (optionally in all or part in the form —SO3H). The invention also relate to the preparation of these surfactants and their use in oil extraction, especially in EOR applications.

Abstract: The present invention relates to the preparation of polymers that are of use in particular as a rheology agent, and are suitable for use in very concentrated saline media, which comprises a step of micellar radical polymerization in which are brought into contact, in an aqueous medium: —hydrophilic monomers; —hydrophobic monomers in the form of a micellar solution, containing micelles comprising these hydrophobic monomers; —a radical polymerization initiator; and —preferably an agent for controlling radical polymerization, wherein said micelles comprise at least one surfactant of amphoteric nature. The polymers obtained according to the invention are in particular of use for enhanced oil recovery.

Abstract: Compositions suitable for enhanced oil recovery comprising a) a mixture of ?-sulfocarbonyl compounds of formulae (1) and (2) in a mixture ratio (1) to (2) of from 1:99 to 99:1 wherein R1, R3 and R5, which may be the same or different at each occurrence, are hydrogen or a linear or branched alkyl chain having 1 to 20 carbon atoms, R2 and R4, which may be the same or different at each occurrence, may be a linear or branched alkyl group having 4 to 24 carbon atoms and in which the alkyl chain may comprise one or more cycloaliphatic groups, and X is H or a metal forming a salt with the sulfonate group, and b) a salt containing aqueous solution.

Abstract: The present invention relates to the preparation of polymers that are of use in particular as a rheology agent, and are suitable for use in very concentrated saline media, which comprises a step of micellar radical polymerization in which are brought into contact, in an aqueous medium: —hydrophilic monomers; —hydrophobic monomers in the form of a micellar solution, containing micelles comprising these hydrophobic monomers; —a radical polymerization initiator; and —preferably an agent for controlling radical polymerization, wherein said micelles comprise at least one surfactant of amphoteric nature. The polymers obtained according to the invention are in particular of use for enhanced oil recovery.

Abstract: Compositions suitable for enhanced oil recovery comprising a) a mixture of a-sulfocarbonyl compounds of formula (1) and (2) in a mixture ratio (1) to (2) of from 1:99 to 99:1 wherein R1, R3 and R5, which may be the same or different at each occurrence, are hydrogen or a linear or branched alkyl chain having 1 to 20 carbon atoms, R2 and R4, which may be the same or different at each occurrence, may be a linear or branched alkyl group having 4 to 24 carbon atoms and in which the alkyl chain may comprise one or more cycloaliphatic groups, and X is H or a metal forming a salt with the sulfonate group, and b) a salt containing aqueous solution.

Abstract: The invention relates to the use of at least one compound corresponding to the formula below: R—O—(—CH2—CH(—CH3)—O—)m—(—CH2—CH2—O—)n—H in which: R is a hydrocarbon-based group comprising from 6 to 40 carbon atoms; m is a number ranging from 0 to 20; n is a number greater than 20; for inhibiting the anionic-surfactant retention phenomena in an oil reservoir, especially in a carbonate-based or argillaceous reservoir.

Abstract: The present invention relates to the use of an aminosulphonate compound corresponding to the following formula (I): R1R2N—CHR3—CHR4—CHR5—SO3? (I) where: •R1 is a preferably C2 to C24 alkyl or alkylamido radical; •R2 is an optionally hydroxylated alkyl radical; •R3, R4 and R5 are, independently of one another, H or OH; it being understood that at least one of the R3, R4 and/or R5 groups is OH, for stabilizing a foam, in particular a foam used to extract hydrocarbons in an underground formation.

Abstract: The instant invention relates to surfactants having the following formula (I) wherein: each of Ra and Rb is a a linear or branched, saturated or unsaturated, hydrocarbon chain, each of Rc and Rd is a alkyl chain having 1 to 10 carbon atoms, each of (E1) and (E2) is a divalent hydrocarbon radical, A is: a group a carboxylate group —COO? (optionally in all or part in the form —COOH); or a sulfonate group —SO3? (optionally in all or part in the form —SO3H). The invention also relate to the preparation of these surfactants and their use in oil extraction, especially in EOR applications.

Abstract: The present invention relates to the preparation of polymers that are of use in particular as a rheology agent, and are suitable for use in very concentrated saline media, which comprises a step of micellar radical polymerization in which are brought into contact, in an aqueous medium: —hydrophilic monomers; —hydrophobic monomers in the form of a micellar solution, containing micelles comprising these hydrophobic monomers; —a radical polymerization initiator; and —preferably an agent for controlling radical polymerization, wherein said micelles comprise at least one surfactant of amphoteric nature. The polymers obtained according to the invention are in particular of use for enhanced oil recovery.

Abstract: The invention relates to the use of at least one compound corresponding to the formula below: R—O—(—CH2—CH(—CH3)—O—)m—(—CH2—CH2—O—)n—H in which: R is a hydrocarbon-based group comprising from 6 to 40 carbon atoms; m is a number ranging from 0 to 20; n is a number greater than 20; for inhibiting the anionic-surfactant retention phenomena in an oil reservoir, especially in a carbonate-based or argillaceous reservoir.