12 MAJOR FUNCTIONS OF DRILLING FLUIDS YOU SHOULD KNOW
Functions Of Drilling Fluids

Drilling Fluid Life Cycle

A complete and comprehensive mud plan must be included in the well planning process. History has proven that an incomplete mud plan will cost the operator many hours of rig time and may mean the difference between a productive or a nonproductive well.

The use of a drilling fluid to remove cuttings from the borehole was first conceived by Fauvelle, a French mud engineer, in 1845.
https://www.drillingmanual.com/2020/07/functions-of-drilling-fluids.html