(A) For all wells plugged with cement, plugs shall be placed in the following intervals:
(1) From total depth or a minimum of fifty feet below the base of the lowest reservoir rock penetrated to a minimum of two hundred feet above the top of the lowest reservoir rock penetrated. With approval of the chief the owner may have the option to plug the lowest reservoir with prepared clay or other materials. If prepared clay is approved by the chief for the bottom hole plug, the plug shall be emplaced from total depth to a minimum of five-hundred feet above the top of the lowest reservoir rock penetrated or perforated. Prior to placing the clay, tools must be run tot total depth to ensure the well bore is clear of obstructions. If an obstruction is found, the well bore must be cleared prior to the placement of the clay.
(2) From minimum of fifty feet below the base to a minimum of one hundred feet above the top of each succeeding reservoir rock formation until the plugging operation has been completed to within a minimum of one hundred feet of the bottom of the surface casing. Exceptions may be granted by the chief.
(3) From a minimum of one hundred fifty feet below the top of the big lime to the top of the big lime. Exceptions to this rule may be granted by the chief.
(4) From a minimum of one hundred feet below to a minimum of one hundred feet above the base of the surface casing.
(5) If the surface casing of a cable tool well has been removed, leaving the fresh water strata unprotected, a cement plug shall be placed from a minimum of fifty feet below the base of the fresh water strata to thirty inches below grade level.
(6) Where the coal owner identifies that a economic mineable coal seam or active underground mine may be affected, a bridge shall be placed in the well bore a minimum of two hundred feet below the mineable coal seam, and the well bore shall be filled with an approved material from the top of such bridge to within a minimum of thirty inches of the grade level. The owner and the coal owner will make reasonable efforts to coordinate plugging to minimize any potential adverse effect and/or future re-plugging of the well.
(7) From a minimum of one hundred feet below the grade level to thirty inches below grade level.
(B) Placement of cement plugs shall be accomplished by one of the following methods: the balance method, the dump-bailer method, a pump-and-plug method, or any other method approved by the chief.
(C) Where necessary to prevent thieving of cement, drilling mud weighing not less than nine pounds per gallon and with not less than forty "American Petroleum Institute" funnel viscosity may be required in all portions of the well not filled with cement or other approved plugging material, unless otherwise approved by the chief.
(D) Cement plugs shall not be circulated into holes where static conditions cannot be reached.
(E) If during the plugging operation, circulation is lost due to the presence of a highly porous and permeable rock formation, it is permissible to place a mechanical bridge or to pump or place any material approved by the chief across the porous zone in order to provide a base on which to place a cement plug not less than two hundred feet in length above the top of such formation.
(F) During plugging, a good fait effort must be made to recover all casing which is not cemented, excluding conductor pipe.
(G) In the event that it is determined by the inspector that borehole conditions render compliance with the above plugging procedures impossible or impractical or if it is determined by the inspector that the above procedures will not fulfill the requirements as set forth under paragraph (A) of rule 1501:9-11-03 of the Administrative Code, then the inspector may designate an alternate thickness and method of emplacement of the plugs, and/or the approved plugging material to insure compliance with paragraph (A) of rule 1501:9-11-03 of the Administrative Code. The inspector may also require or approve the placing of brush and stone bridges, and/or mechanical bridges in the well bore or casings, when in his judgement, such bridges will be necessary to insure that the plugging material placed in the well remains at the point in the well where such material had been placed.
(H) In order to promote enhanced recovery, including but not limited to secondary and tertiary operations, the chief may require special plugging conditions.
Replaces: 4101:10-1-03, 4101:10-1-04, 4101:10-1-05; Eff 7-16-82; 9-27-93; 4-15-04
Rule promulgated under: RC 119.03
Rule authorized by: RC 1509.03
Rule amplifies: RC 1509.15
RC 119.032 review dates: 9/16/03, 1/27/04, 4/15/09