Drilling fluid with improved fluid loss and viscosifying properties

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 mo...

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Bibliographische Detailangaben
Hauptverfasser:	Ratel, Olivier, Cheucle, Pierrick, Favero, Cédrick, Giovanneti, Bruno
Format:	Patent
Sprache:	eng
Schlagworte:	ADHESIVES CHEMISTRY COMPOSITIONS BASED THEREON DYES MACROMOLECULAR COMPOUNDS OBTAINED BY REACTIONS ONLY INVOLVINGCARBON-TO-CARBON UNSATURATED BONDS MATERIALS FOR MISCELLANEOUS APPLICATIONS, NOT PROVIDED FORELSEWHERE METALLURGY MISCELLANEOUS APPLICATIONS OF MATERIALS MISCELLANEOUS COMPOSITIONS NATURAL RESINS ORGANIC MACROMOLECULAR COMPOUNDS PAINTS POLISHES THEIR PREPARATION OR CHEMICAL WORKING-UP
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Beschreibung
Zusammenfassung:	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.