Section R. 408.15708 - Definitions; T to WRule 5708.
(1) "Tour" means the work period of a rig crew and is usually pronounced as if spelled "t-o-w-e-r."(2) "Tubing" means a small diameter pipe that is run into a well to serve as a conduit for the passage of oil or gas to the surface.(3) "Valve drilling operation" means the drilling of a hole through the blocking element of a valve that is stuck in the closed position with pressure on the well side of the valve.(4) "Weight indicator" means an instrument that shows the weight suspended from the hooks.(5) "Well servicing" means the remedial or maintenance work performed on an oil or gas well to improve or maintain the production from a formation already producing.(6) "Well servicing rig" means a portable rig consisting of a hoist, engine, and a self-erecting mast.(7) "Wellbore" means the hole made by drilling or boring.(8) "Wire line wiper" means a device used to wipe off oil, mud, or liquid from a wire line as it is pulled out of the well.Mich. Admin. Code R. 408.15708