weight on the drill bit

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• Drill string — A drill string on a drilling rig is a column, or string, of drill pipe that transmits drilling fluid (via the mud pumps) and torque (via the kelly drive or top drive) to the drill bit. The term is loosely applied as the assembled collection of… …   Wikipedia

• Weight on bit — [http://www.osha.gov/SLTC/etools/oilandgas/glossary of terms/glossary of terms w.html] (WOB), as expressed in the oil industry, is the amount of downward force exerted on the drill bit and is normally measured in thousands of pounds …   Wikipedia

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• Drill pipe — Drill pipe, is hollow, thick walled, steel piping that is used on drilling rigs to facilitate the drilling of a wellbore and comes in a variety of sizes, strengths, and weights but are typically 30 to 33 feet in length. They are hollow to allow… …   Wikipedia

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