Patent ID: 8236735

Claim:
A lubricant additive in oil-based drilling mud composition comprising an oligoglycerol fatty acid esters, produced from (a) an acid component, selected from (a1) fatty acids of the general formula (I) R—COOH (I) in which R stands for a saturated or unsaturated, branched or linear alkyl- or alkenyl radical with 7 to 21 C atoms, and/or (a2) dicarboxylic acids and/or (a3) dimer fatty acids and/or (a4) oligomer fatty acids and/or (a5) hydroxy fatty acids; and (b) a polyol component, which is selected from oligoglycerols or alkoxylates of oligoglycerols; wherein said oil-based drilling mud comprises paraffin; and wherein said paraffin comprises 13 to 22 carbon atoms and other hydrocarbons including alpha olefin, internal olefins.