Drilling below 3,000 feet shall be done with mud appropriate to prevent flowback or blowout. The hole should be kept full at designated weight at all times until the producing sand is reached. The mud shall be weighted at such intervals as may be determined by the Inspector. When withdrawing the drill pipe, pipe shall be filled with mud after each 11 stands have been withdrawn. Drilling the producing oil sand, however, may be done with oil in lieu of mud; provided, however, that if the oil is in circulation, such oil shall not be over 30-B gravity with a flash point of not less than 350ºF and after being so used shall be by the operator turned into a circulating tank instead of into the pits. If, at any time, the weight of such mud shall be less than specified herein, any inspector or officer of the city shall have the right to suspend drilling and all operations in or about such well until the weight of such mud shall comply herewith or the conditions of the oil shall be made to comply with the provisions of this chapter.
(Prior Code, § 113.059) (Ord. 1583, passed 1-8-2008)