R 324.405 Drilling fluids generally.

Rule 405. The drilling fluid used for drilling wells described in R 324.201(1) m us t be capable of sealing off and protecting each oil, gas, brine, or fresh water stratum above the stratigraphic or producing horizon and controlling subsurface pressures. The water or brines used in the drilling fluid must be from a source approved by the supervisor or authorized representative of the supervisor, used pursuant to approved safe drilling practice, and tested as instructed by the supervisor, except that the water used in the drilling fluid for the drilling of the hole for the surface casing must be fresh water that is free of contamination in concentrations that may cause disease or harmful physiological effects.