Use of selected ester oils in drilling fluids and muds

USRE36066E · kind E · reissue

Assignees

• Henkel AG & Co. KGaA · DE
• Baroid Limited · GB

Inventors

• Heinz Mueller · Monheim, DE
• Claus-Peter Herold · Mettmann, DE
• Stephan von Tapavicza · Erkrath, DE
• Douglas J. Grimes · Fulford, GB
• Jean-Marc Braun · Celle, DE
• Stuart Paul Smith · Stamford, GB

Key dates

• Filing date: Aug 1, 1995
• Grant date: Jan 26, 1999
• Expiry date: Aug 1, 2015

Classification

• Technology area (CPC —): General

Abstract

Invert emulsion muds for drilling of gas and oil, which are environmentally safe, and which contain: PA1 A. a continuous oil phase composed predominantly of at least one monocarboxylic acid ester of a C.sub.2 -C.sub.12 monofunctional alkalol wherein the monocarboxylic acid contains from 16 to 24 carbon atoms and is olefinically mono- or poly-unsaturated, PA1 B. a disperse aqueous phase, PA1 C. at least one emulsifier, PA1 D. at least one weighing agent, PA1 E. at least one fluid loss additive, and PA1 F. a mild alkaline reserve.