Section R. 408.15704 - Definitions; D to FRule 5704.
(1) "Derrick," sometimes called a mast, means a large load-bearing structure that supports the crown block.(2) "Derrick board" means the platform on which derrickmen work.(3) "Draw works" means the hoisting mechanism on a drilling, well servicing, or workover rig. It is essentially a large winch that spools off or takes in the hoisting line.(4) "Drill pipe" means a length of steel tube to which special threaded connections called tool joints are attached. Several lengths joined together are called a drill string.(5) "Drill stem" means the entire drilling assembly from the swivel to the bit composed of the kelly, drill string, subs, drill collars, and other downhole tools such as stabilizers and reamers.(6) "Drilling line," sometimes called a hoisting line, means the wire line used in the main rig hoisting system, one end of which is attached to the hoisting drum. This line does not include a tugger line.(7) "Drilling rig" means the equipment and machinery assembled primarily for the purpose of drilling or boring a hole in the ground.(8) "Drill stem test" means a method of gathering data on the potential productivity of a formation by permitting the flow of formation fluids through the drill pipe.(9) "Elevator" means a mechanical device attached to the traveling block that latches around and supports the pipe during hoisting.(10) "External guylines" means lines that run from some point in the derrick, mast, or pole to ground anchors or to a special substructure or derrick base which provides a substitute for ground anchors to provide stability.(11) "Flow line" means the surface pipe which carries drilling fluid from surface tanks or other storage.(12) "Freezing operation" means the creation of a plug by freezing a liquid slug in a pipe or fitting.Mich. Admin. Code R. 408.15704