S.p.c.m. Sa

Snf Group

Pierrick Cheucle

Cédrick Favero

Olivier Braun

Cedrick Favero

Bernard Quillien

Olivier Ratel

Bruno Giovanneti

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:

Drilling fluid with improved fluid loss and viscosifying properties

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 HC&#x2550;CRR, Rbeing a hydrogen atom or a methyl group and Rbeing 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; Rbeing different from the C(&#x2550;O)&#x2014;OH group.

Water-soluble hydroxyalkyl polymer obtained by a method of inverse suspension or inverse emulsion polymerisation

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.

Process for friction reduction during ethanol transport

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Saint Romain le Puy, France

Pierrick Cheucle