R 299.2355 Drilling fluids generally.

Rule 2355. The drilling fluid used for drilling wells described in R 299.2311(1) shall be capable of sealing off and protecting each oil, gas, brine, or fresh water stratum encountered during drilling, and controlling subsurface pressures. The water or brines used in the drilling fluid shall be from a source approved by the supervisor of mineral wells or authorized representative of the supervisor of mineral wells, used under approved safe drilling practices, and tested as instructed by the supervisor of mineral wells, except that only fresh water shall be used in the drilling of the hole for the surface casing. The supervisor of mineral wells or authorized representative of the supervisor of mineral wells may approve the use of fluids other than water for drilling fluids.