COMPOSITION LUBRIFIANTE BIODEGRADABLE ET SES UTILISATIONS, NOTAMMENT DANS UN FLUIDE DE FORAGE

摘要

The invention concerns a biodegradable lubricating composition, based on mineral hydrocarbon oil and ester, comprising a majority amount of a mineral hydrocarbon fraction substantially free of aromatic compounds, said fraction having a normal paraffin content not more than 10 wt. % and an isoparaffin content not less than 36 wt. %, and a minority amount ranging between 5 and 40 wt. % of at least a fatty acid ester.