Tapavicza Stephan Von

Use of selected ester oils in drilling fluids, especially for off-shore oil or gas recovery

Esters of medium chain size carboxylie acids as components of the oil phase of invert emulsion drilling fluids

Use of selected fatty esters in drilling fluids, especially in offshore oil or gas recovery

Use of selected lower carboxylic-acid ester oils in drilling fluids

Oleophilic alcohols as components of invert-emulsion drilling fluids

Oleophilic basic amine derivatives as additives for invert emulsion drilling fluids

Use of selected ester oils in water based drilling fluids of the oil in water emulsion type, and drilling fluids with improved ecological qualities

Verwendung ausgewählter Esteröle in Bohrspülungen insbesondere zur off-shore-Erschliessung von Erdöl- bzw. Erdgasvorkommen (l)

Compositions for freeing stuck drill pipes

Monocarboxylic-acid methyl ester for invert emulsion drilling fluids