A method for recycling an invert emulsion based drilling fluid, in which the
invert
emulsion based drilling fluid includes an oil component and an aqueous component.
The method includes: mixing the invert emulsion drilling fluid with a emulsion
clearing agent, wherein the emulsion clearing agent is a mixture of an anionic
tensid and a non-ionic tensid; and separating the oil component of the invert emulsion
drilling fluid from the aqueous component of the invert emulsion drilling fluid.
The method preferably utilizes an emulsion breaking agent that is a combination
of an anionic tensid, a non-ionic tensid and an alkyl polyglycoside tensid.