Section R. 324.410 - Casing other than surface casingRule 410.
(1) A person who drills a well or causes a well to be drilled pursuant to R 324.201 or rules that were in effect before the effective date of these rules shall case the well in a manner approved by the supervisor to prevent waste.(2) In addition to the surface casing, the supervisor may require or order a string of casing to be run to seal off any of the following:(a) A potentially productive oil or gas zone, or both.(b) A lost circulation zone.(c) A utilized natural brine or mineral zone.(e) A high-pressure zone.(f) A reservoir undergoing secondary recovery.(3) All casing, except for casing set pursuant to R 324.413, shall be of sufficient weight, grade, and condition to have a designed minimum internal yield of 1.2 times the greatest expected well bore pressure to be encountered.(4) For the purpose of proper sealing of wells and the prevention of waste, the minimum hole size for a given casing shall be as shown in table 410: Table 410 Minimum Hole Size
| Minimum hole Size | |
| Casing size | | Minimum hole size |
| outside diameter (O.D.)-inches | inches | outside diameter - |
| Up to 7 O.D. | 1 1/2 | Casing O.D. + |
| More than 7 O.D. | 2 | Casing O.D. + |
| More than 10 3/4 O.D. | 3 | Casing O.D. + |
An exception to the minimum hole size as shown in table 410 may be granted by the supervisor or authorized representative of the supervisor, upon a written request by the permittee or applicant, if it is determined that the proposal provides proper sealing of the well. The supervisor or authorized representative of the supervisor may require a larger hole size for the surface hole than the size shown in table 410 in order to prevent waste.
Mich. Admin. Code R. 324.410