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 the drill pipe, drill collars, tools and drill bit. The drill string is hollow so that drilling fluid can be pumped down through it and circulated back up the annulus (the void between the drill string and the casing/open hole).
Other articles related to "drill, drill string, drill strings, string":
... Pipe rams close around a drill pipe, restricting flow in the annulus (ring-shaped space between concentric objects) between the outside of the drill pipe ... have no openings for tubing, can close off the well when the well does not contain a drill string or other tubing, and seal it ... Shear rams cut through the drill string or casing with hardened steel shears ...
... In a drilling rig, the drill line is a multi-thread, twisted wire rope that is threaded or reeved through the traveling block and crown block to facilitate the lowering and lifting ... a connection is to add another segment of drill pipe onto the top the drill string ... table, stopping the mud pump, hanging off the drill string in the rotary table, unscrewing the kelly from the drill pipe below, swinging the kelly over to permit ...
... Derrick (#14) is the support structure for the equipment used to lower and raise the drill string into and out of the wellbore ... whose main function is to reel in/out the drill line to raise/lower the traveling block ... Drill Bit (#26) is a device attached to the end of the drill string that breaks apart the rock being drilled ...
... and monitor wellbore pressure Center and hang off the drill string in the wellbore Shut in the well (e.g ... the wellhead (close off the wellbore) Sever the casing or drill pipe (in case of emergencies) ... In drilling a typical high-pressure well, drill strings are routed through a blowout preventer stack toward the reservoir of oil and gas ...
... sinusoidal harmonic motion from the surface into the work string at the surface ... and hence vibration of the pipe string, is tuned to the resonant frequency of the system ... The system is defined as the surface resonant vibrator, pipe string, fish and retaining media ...
Famous quotes containing the words string and/or drill:
“... looped with the creep of varying light,
Monkey-brown, fish-grey, a string of infected circles
Loitering like bullies, about to coagulate....”
—Philip Larkin (19221986)
“Swift blazing flag of the regiment,
Eagle with crest of red and gold,
These men were born to drill and die.
Point for them the virtue of slaughter,
Make plain to them the excellence of killing
And a field where a thousand corpses lie.”
—Stephen Crane (18711900)