drill string

American  

noun

1. (on a drill rig) the assemblage of drill pipes that link the drill bit to the mechanism that imparts rotary or reciprocating motion.

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drill string British  

noun

1. (in the oil industry) a pipe made of lengths of steel tubing that is attached to the drilling tool and rotates during drilling to form a bore

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Etymology

Origin of drill string

First recorded in 1695–1705

Example Sentences

The Lineham Creek well suffered a significant blow out a few months ago and the drill string got stuck in the pipe.

From Forbes

Even with good 3D seismic maps, drilling still requires information about precisely what the head of the drill string is chewing through. 

From Forbes

Figure 3: Drilling crew tighten the logging tools into place in the drill string on the rig floor of Chikyu.

From Scientific American

Workers in Midland, Tex., with a pipe to be lowered into the drill string of an oil rig that was boring to a depth of nearly 11,000 feet.

From New York Times

Last year, a kick in the Blackbeard East well 90 miles away stopped progress for almost half a year. At that time, gas coming up the hole ripped the drill string and a 4200 foot piece broke off and was caught in the hole. 

From Forbes