Abstract: The invention relates to a water-soluble branched sulfonated amphoteric polymer, for a water-based drilling fluid, wherein the polymer is obtained by precipitation polymerization, in a mixture of polar solvents, of at least one N,N?-dialkylacrylamide monomer and one sulfonic acid-containing monomer, in the presence of tetraallylammonium halide as branching agent. The invention also relates to a water-based drilling fluid for subterranean boreholes, including: an aqueous fluid, said aqueous fluid being selected from sea water, brine, or salt-containing aqueous solution, between 0.1 and 5.0 weight percent of the water-soluble branched sulfonated amphoteric polymer described above.

Abstract: The invention relates to a water-soluble branched sulfonated amphoteric polymer, for a water-based drilling fluid, wherein the polymer is obtained by precipitation polymerization, in a mixture of polar solvents, of at least one N,N?-dialkylacrylamide monomer and one sulfonic acid-containing monomer, in the presence of tetraallylammonium halide as branching agent. The invention also relates to a water-based drilling fluid for subterranean boreholes, including: an aqueous fluid, said aqueous fluid being selected from sea water, brine, or salt-containing aqueous solution, between 0.1 and 5.0 weight percent of the water-soluble branched sulfonated amphoteric polymer described above.

Abstract: This invention relates to a water-soluble polymer in bead or powder form, characterized in that it has a Brookfield viscosity greater than 100 cps, and in that it is obtained by inverse suspension or inverse emulsion polymerization, in the presence of a transfer agent, of monomers where less than 20 mol % is made up of a hydroxyalkyl monomer with formula H2C?CR1R2, R1 being a hydrogen atom or a methyl group and R2 being a hydrocarbon group containing at least one OH pendant group or at least one epoxide group and optionally at least one N or O heteroatom in the hydrocarbon chains; R2 being different from the C(?O)—OH group.

Abstract: This invention involves a process for reducing friction in ethanol during its transport through pipelines. This process involves combining ethanol with a polymer-based composition, characterized in that the polymer is obtained from at least 50 mol % of at least one monomer selected from the group comprising N-substituted acrylamides, N-substituted methacrylamides, N,N-substituted acrylamides, N,N-substituted methacrylamides, substituted acrylates and substituted methacrylates.

Abstract: This invention relates to a water-soluble polymer in bead or powder form, characterized in that it has a Brookfield viscosity greater than 100 cps, and in that it is obtained by inverse suspension or inverse emulsion polymerization, in the presence of a transfer agent, of monomers where less than 20 mol % is made up of a hydroxyalkyl monomer with formula H2C?CR1R2, R1 being a hydrogen atom or a methyl group and R2 being a hydrocarbon group containing at least one OH pendant group or at least one epoxide group and optionally at least one N or O heteroatom in the hydrocarbon chains; R2 being different from the C(?O)—OH group.

Abstract: This invention involves a process for reducing friction in ethanol during its transport through pipelines. This process involves combining ethanol with a polymer-based composition, characterised in that the polymer is obtained from at least 50 mol % of at least one monomer selected from the group comprising N-substituted acrylamides, N-substituted methacrylamides, N,N-substituted acrylamides, N,N-substituted methacrylamides, substituted acrylates and substituted methacrylates.