All persons, firms and corporations drilling wells within the city limits shall provide two strings of pipe set in accordance within the following procedure.
(A) The surface casing shall consist of new or reconditioned pipe with an original mill test of not less than 1,200 pounds per square inch, and shall be set and cemented in the first shale break below the base of the Trinity Fresh Water Sand. Cementing shall be by the pump and plug method, and sufficient cement shall be used to fill the annular space back of the pipe to the surface of the ground or the bottom of the cellar. Cement shall be allowed to stand a minimum of 12 hours under pressure and a total of 24 hours before initiating tests. Before drilling the plugs, a pump pressure of at least 1,000 pounds per square inch shall be applied. If at the end of 30 minutes the pressure shows a drop of 100 pounds per square inch, or more, the casing shall be condemned. After the corrective operations the casing shall be tested in the same manner, and this string shall stand the required tests before compliance with this rule shall have been made.
(B) The producing or oil string shall consist of new or reconditioned pipe that has been tested to and has withstood the application of a pressure of at least 2,100 pounds per square inch. Cementing shall be by the pump and plug method, and sufficient cement shall be used to fill the calculated annular space behind the pipe to a minimum of 1,000 feet above the guide shoe. Cement shall be allowed to stand a minimum of 12 hours under pressure and a total of 24 hours before initiating tests. Before drilling the plug, a pump pressure of at least 1,500 pounds per square inch shall be applied. If at the end of 30 minutes the pressure shows a crop of 100 pounds per square inch, or more, the casing shall be condemned. After corrective operations, the casing shall again be tested in the same manner, and this string shall stand the required test before compliance with this rule shall have been made.
(C) Each person, firm or corporation shall furnish to the city evidence of following the above provisions and shall further provide written guarantees that each oil and/or gas well is cased in accordance with said procedures.
(Ord. 009-76, passed 12-6-1976) Penalty, see § 97.99