A lubricant composition comprising an ester. use of the composition and well fluid having the composition

- The present invention relates to an optimized lubricant composition comprising, in sufficient quantity, an ester and a fatty acid -. In one embodiment, the composition also contains a tertiary amine, for example triethanolamine - the invention also relates to a wellbore fluid comprising the lubricating composition according to the invention -. the invention also relates to a use of the composition for controlling the lubricating capacity of a fluid based water.