Section R. 408.15703 - Definitions; A to CRule 5703.
(1) "Acidizing" means the act of pumping an acidic solution into a wellbore to remove any materials from the perforations, pipe, and walls of the producing formation and includes the act of pumping the substance into formations to improve permeability.(2) "Air, gas, or mist drilling" means a method of rotary drilling using compressed air or gas as its primary circulating medium.(3) "Anchor" means a device that is used to secure, fasten, or stabilize.(4) "Bleed-off line" or "blooey line" means a pipe used to discharge materials or release pressure away from a well or pressurized equipment.(5) "Blocks, crown, and traveling" means the fixed upper and movable lower blocks, respectively, of the block and tackle assembly on a rig that raises and lowers the drill string or tubing.(6) "Blowout" means an uncontrolled flow of gas, oil, or other well fluids.(7) "Blowout preventer" means a device attached to the wellhead that allows the well to be sealed to confine the well fluids in the wellbore.(8) "Casing" means the pipe installed in the wellbore.(9) "Cathead" means a rotating device mounted on the end of a shaft of the draw works.(10) "Catwalk" means an elongated platform to the side of a rig where pipe is laid out and lifted into the derrick. A catwalk is connected to the rig floor by a pipe ramp.(11) "Cellar" means an excavation around the wellhead to provide space for items of equipment at the top of the wellbore.(12) "Cementing" means the act of pumping a slurry into a wellbore to perform functions such as supporting and sealing casing, isolating formations behind casing, protecting freshwater formations, and sealing perforations in casing.(13) "Choke line" means an extension of pipe from the blowout preventer which is used to direct well fluid from the annulus to the choke manifold.(14) "Christmas tree" means the valves and fittings assembled at the top of a completed well to control the flow of hydrocarbons and other fluids.(15) "Crown block" means an assembly of sheaves or pulleys mounted on beams at the top of the derrick or mast over which a hoisting line is reeved.Mich. Admin. Code R. 408.15703