strength of 500 psi before disturbing the casing or resuming drilling. Surface casing, other
protective casing strings, and blowout preventers shall be tested pursuant to R 324.406(4)
before drilling out the cement, unless otherwise specified by the supervisor or authorized
representative of the supervisor.
(e) Drilling fluid shall be circulated and conditioned at a point not less than 100 feet above
the gas storage reservoir and shall be maintained with the following characteristics until
the gas storage reservoir is cased off:
(i) Drilling fluid density shall be sufficient to provide a hydrostatic pressure of not less
than 100 psig above the anticipated bottom hole pressure of the gas storage reservoir.
(ii) When drilling through the storage reservoir, the drilling fluid shall have a maximum
fluid loss of 15 cubic centimeters or less as specified by the API standard procedure for
testing drilling fluids, API RP 13B-1, entitled “Recommended Practice for Field Testing
Water-Based Drilling Fluids,” March, 2009, fourth edition, which is adopted by reference
in these rules. Copies are available for inspection at the Lansing office of the office of oil,
gas, and minerals of the department of environmental quality. Copies may be obtained from
the Michigan Department of Environmental Quality, Office of Oil, Gas, and Minerals, P.O.
Box 30256, Lansing, Michigan 48909, at a cost as of the time of adoption of these rules of
$165.00 each, and from the American Petroleum Institute, 1220 L Street NW, Washington,
DC 20005, at a cost as of the time of adoption of these rules of $165.00 each.
(f) Hole size shall be large enough to allow the running of a separate intermediate casing,
which shall be set through each gas storage reservoir. The casing shall be new and conform
to the API specification and performance properties for casing, tubing, and drill pipe, API
BULL 5C3, entitled “Bulletin on Formulas and Calculations for Casing, Tubing, Drill Pipe,
and Line Pipe Properties, October 1, 1994,” sixth edition, which is adopted by reference in
these rules. Copies are available for inspection at the Lansing office of the office of oil,
gas, and minerals of the department of environmental quality. Copies may be obtained from
the Michigan Department of Environmental Quality, Office of Oil, Gas, and Minerals, P.O.
Box 30256, Lansing, Michigan 48909, at a cost as of the time of adoption of these rules of
$206.00 each, and from the American Petroleum Institute, 1220 L Street NW, Washington,
DC 20005, at a cost as of the time of adoption of these rules of $206.00 each. The gas
storage operator shall be allowed to review the intermediate casing design and cementing
program before implementation. Intermediate casing shall be set in competent stratum
approximately 100 feet below the base of the gas storage reservoir or set as required by the
supervisor or authorized representative of the supervisor. Intermediate casing shall be
designed for the maximum gas storage reservoir operating pressure using a minimum
collapse design factor of 1.125, a minimum burst design factor of 1.25, and a minimum
tension design safety factor of 1.6. The minimum hole size for a given size casing shall be
pursuant to R 324.410(4). The hole shall be properly conditioned before running casing by
circulating the drilling fluid at a rate equal to the drilling circulating rate and by utilizing a
circulating time equivalent of not less than twice the hole displacement. Casing shall be
equipped with a sufficient number of centralizers and scratchers to ensure good cement
distribution and shall include centralizers above and below the gas storage reservoir. All
centralizers shall conform to the API for casing centralizers, API specification 10D,
entitled “Specification for Bow-Spring Casing Centralizers,” March 6, 2002, sixth edition,
which is adopted by reference in these rules. Copies are available for inspection at the
Lansing office of the office of oil, gas, and minerals of the department of environmental
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