053-7 Wyo. Code R. § 7-6
(a) Surface casing shall be run to reach a depth to prevent blowouts or uncontrolled wells. In areas where pressures and formations are unknown, surface casing shall be of sufficient size to permit the use of an intermediate string, or strings of casing. Surface casing shall be set in or through an impervious formation and shall be cemented by the pump and plug or displacement or other approved method with sufficient cement to fill annulus to the top of the hole. If cement is not circulated to surface during the primary operation, supplemental cemented operations shall be performed to assure that the annular space from the casing shoe to the surface is filled with cement.
(b) The cemented casing string shall stand under pressure until the cement has reached a compressive strength of 300 pounds per square inch: providing, however, that no further operation shall be commenced until the cement has been in place for at least eight (8) hours. The term "under pressure" as used herein shall be complied with if one (1) float valve is used or if pressure is otherwise held.
(c) Setting depths of all casing strings shall be determined by taking into account formation fracture gradients and the maximum anticipated pressure to be maintained within the well bore.
(d) If and when it becomes necessary to run a production string, such string shall be cemented by the pump and plug method and shall be properly tested by the pressure method before cement plugs are drilled.
(e) Any gas escaping from the well during drilling operations shall be, as far as practicable, conducted to a safe distance from the well site and burned in accord with the Rules and Regulations of the Department of Environmental Quality of the State of Wyoming, or otherwise safely disposed of.
053-7 Wyo. Code R. § 7-6