Aqueous, clay-based drilling fluids - contg. polyhydroxy dicarboxylic acid as dispersibility improver

Drilling fluids comprising aqueous clay (e.g. beutonite) dispersions and opt. weighted and/or modified with salts and contg. lignosulphonates or their salts are modified by sheorporation of 2-20 wt% of polylydroxy dicarboxylic acids (I) to impart improved dispersibility. Specif. claimed compsns. con...

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Bibliographische Detailangaben
Hauptverfasser:	SOHN, A.W.., 6800 MANNHEIM, KOEHLER, LEO, 6719 BOBENHEIM
Format:	Patent
Sprache:	eng ; ger
Schlagworte:	ADHESIVES CHEMISTRY DYES MATERIALS FOR MISCELLANEOUS APPLICATIONS, NOT PROVIDED FORELSEWHERE METALLURGY MISCELLANEOUS APPLICATIONS OF MATERIALS MISCELLANEOUS COMPOSITIONS NATURAL RESINS PAINTS POLISHES
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Beschreibung
Zusammenfassung:	Drilling fluids comprising aqueous clay (e.g. beutonite) dispersions and opt. weighted and/or modified with salts and contg. lignosulphonates or their salts are modified by sheorporation of 2-20 wt% of polylydroxy dicarboxylic acids (I) to impart improved dispersibility. Specif. claimed compsns. contain (I) derived by oxidation from pentose and/or hexose, and FeII, FeIII or CrIII lignosulphonates.