ALEXANDRIA, Va., May 12 -- United States Patent no. 12,625,127, issued on May 12, was assigned to Halliburton Energy Services Inc. (Houston).

"Field test for determining concentration of emulsifiers in drilling fluids using dyes" was invented by Jeffrey J Miller (Houston) and Jay Deville (Houston).

According to the abstract* released by the U.S. Patent & Trademark Office: "Oil-based drilling fluids can include an emulsifier to help stabilize the phases of the fluid. During repeated use, the amount of free emulsifier can become depleted. A field test can be used to determine the amount of free emulsifier in the fluid. Top oil from an aliquot from the fluid can be placed into a testing vial and mixed with an aqueous solution including a dye...