| abstract |
The use is described of oligoglycerol fatty acid esters, produced fromn (a) an acid component, selected fromn (a1) fatty acids of the general formula (I)n nR—COOH (I)n in which R stands for a saturated or unsaturated, branched or linear alkyl- or alkenyl radical with 7 to 21C atoms, and/or (a2) dicarboxylic acids and/or (a3) dimer fatty acids and/or (a4) oligomer fatty acids and/or (a5) hydroxy fatty acids with n (b) a polyol component, which is selected from oligoglycerols or alkoxylates of oligoglycerols, as additive to oil-based drilling mud compositions to improve the lubricating effect of these mud systems. |