Ether carboxylic acids as additives for improving the lubricating effect of water-based drilling muds

摘要

The invention relates to the use of a combination of ether carboxylic acids of the general formula (i)Ro (ch₂Ch₂O)_x(Ch₂Chr¹O)_yCh₂-Coox,in the r represents a saturated or unsaturated, branched or unbranched alkyl - and / or alkenyl radical having 6 to 22 c - atoms, x is a number from 1 to 20 and y for zero or a number of 1 to 20, with the proviso that the sum of x and y is a minimum of 1 and a maximum of 25, and r¹ an alkyl radical having 1 to 4 c - atoms and x represents a hydrogen atom or a a - or polyvalent cation, together with a lubricant additive for improving the lubricating effect of water-based drilling muds.