Environmentally friendly water based drilling fluids

摘要

An oil-in-water emulsion composition is disclosed which comprises a mixture of brine and; (A) at least one natural oil or synthetic triglyceride of the formula <IMAGE> wherein R1, R2 and R3 are independently saturated or unsaturated aliphatic groups that contain from about 7 to about 23 carbon atoms; (B) at least one alcohol, R4OH wherein R4 is an aliphatic group containing from 1 up to about 18 carbon atoms; (C) at least one emulsifier; and (D) at least one sulfurized composition wherein (B), (C) and (D) are soluble and reside within (A).