Drilling muds effective at high temperature

US5424283A · kind A · utility

Assignees

• Eniricerche S.p.A. · IT
• Agip S.p.A. · IT

Inventors

• Fausto Miano · Enna, IT
• Antonello Pittalis · Milano, IT
• Thomas P. Lockhart · Lodi, IT
• Stefano Carminati · Monza, IT
• Giovanni Burrafato · Tavazzano, IT

Key dates

• Filing date: Aug 1, 1994
• Grant date: Jun 13, 1995
• Expiry date: Aug 1, 2014

Classification

• Technology area (CPC C): Chemistry; Metallurgy
• CPC primary: C09K8/203
• WIPO field: Basic materials chemistry
• WIPO sector: Chemistry

Abstract

Aqueous drilling muds effective at high temperature containing complexes, preformed or formed in situ, of tetravalent zirconium with one or more organic acids, or relative salts, of general formula (I) ##STR1## where R.sub.1 and R.sub.2, which can be the same or different, represent --H, --COOH, --CH.sub.3, --CH.sub.2 COOH or --CH(OH)COOH, or R.sub.1 and R.sub.2 jointly represent an oxo group (.dbd.O).