Patent ID: 6525003
Filing Date: 2003-02-25
Classification: G01V

Abstract:
A well logging fluid comprising:a non-conductive fluid, wherein the non-conductive fluid is selected from the group consisting of a non-aqueous fluid and an invert emulsion of an aqueous phase in a non-conductive liquid; and an effective amount of a salt sufficient to modify the electrical characteristics of the non-conductive fluid resulting in the well logging fluid with an electrical stability of at most 350 volts as measured according to API RB 13-2 in which an electrical well-logging tool when disposed in the well logging fluid can perform an electrical well-logging survey of a borehole containing the well logging fluid, wherein the salt has a cation and an anion, the cation is selected from the group consisting of divalent and trivalent metal cations capable of forming a complex, and the anion is one that disassociates from the cation in an aqueous medium.