(a) The drilling preparation used in wells drilled with rotary equipment shall be capable of sealing off each oil, gas, brine or fresh water stratum above the producing horizon or objective information and shall be capable of preventing "blowouts" and flows of salt or fresh water, in accordance with good oil field practice.
(b) Such rotary tools shall have the innermost string of casing equipped with a blowout preventor properly installed and tested prior to drilling into any formation likely to contain oil or gas.
(Ord. 433. Passed 8-17-64.)