1501:9-11-01 Definitions.

(A) "Chief" means chief, of the Division of Mineral Resources Management or his/her authorized representative.

(B) "Oil and Gas" means crude oil or natural gas or both.

(C) "Division" means Division of Mineral Resources Management, department of natural resources.

(D) "Reservoir rock" means a body of rock sufficiently porous to permit the accumulation of water, petroleum, natural gas or other fluids.

(E) "Inspector" means any supervisor, or inspector employed by the division, or any other representative authorized by the chief.

(F) "Fresh water strata" means all unconsolidated rock material or sedimentary rock containing water with less than ten thousand milligrams per liter total of dissolved solids.

(G) "Casing" means lengths of steel pipe, coupled or connected together to form a continuous conduit in the well bore.

(H) "Conductor pipe" means steel casing, either driven or set through the soil, and/or unconsolidated rock materials and into bedrock for the purpose of isolating near surface water, and such unconsolidated rock materials from the well bore.

(I) "Surface casing" means any casing placed in the well bore for the purpose of protecting fresh water strata and other reservoir rock, and/or for the prevention of the invasion of fresh water into the well bore.

(J) "Intermediate string" means any casing placed in the well bore after the surface casing but before the long string for operational reasons.

(K) "Long string" means any casing placed in the well bore for the purpose of protecting the producing zones.

(L) "Drilling Mud" means any mixture of water, bentonite, and/or clay to form a slurry as commonly used in the oil and gas industry.

(M) "Cement" means a complex, finely-ground kiln-fired calcium silicate which, when mixed with water, forms a slurry which will harden in the borehole to form an effective seal between the well bore and casing or tubing, or to effectively seal formations penetrated by the well bore.

(N) "Prepared clay" means a commercially processed, finely ground composite extracted from, a Pennsylvanian underclay, Pleistocene glacial clay or other materials as approved by the chief. The chief shall establish standards and conduct tests as necessary to identify approved sources of prepared clay.

(O) "Sulfate resistant cement" means a cement-additive blend that resists deterioration in the presence of hydrogen sulfide.

(P) "Rat hole" means a shallow hole into which the kelly and swivel are placed when hoisting operations are in progress.

(Q) "Mouse hole" means a shallow hole into which a length of drill pipe is placed temporarily for later connection to drill string.

(R) "Precast concrete plug" means a tapered plug, constructed of concrete and precast in various sizes, expressly for creating a bridge on a casing seat or ripped casing.

(S) "Mechanical" bridge means a manufactured device designed to seal the well bore or inside diameter of various sizes of casing that may be used as a base for approved plugging material.

(T) "Brush and stone bridge" means an obstruction, made of timber and stone, and placed in a well bore to form an effective base for plugging material.

(U) "Identification tag" means brass or steel plate with the initials ODNR, and the permit number legibly braised, burned or stamped in the surface, and affixed on top of the casing.

(V) "Big lime" means all rock units above the Silurian Rochester Shale and below the Devonian Olentangy Shale.

(W) "Brine" means all saline geological formation water resulting, obtained, or produced in connection with the exploration, drilling, or production of oil or gas.

(X) "Squeeze" means the pumping of a cement slurry under pressure through perforations to seal the back side of casing.

(Y) "Mineable coal seam" means any underground coal seam, of sufficient thickness, that may be economically mined by current mining methods.

HISTORY: Replaces: 4101:10-1-01;Eff 1-22-75; 7-16-82; 8-9-93; 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