drill string

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drill string

or

drill pipe

n
(Mining & Quarrying) (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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References in periodicals archive ?
Ultimately, Hard Rock used proprietary tooling to free the stuck drill string.
Trying to get a stuck drill string out of hole can be difficult and sometimes impossible.
Hammers are used to assist drill stem recovery projects and provide extra force assist when an HDD machine is attempting to retrieve stuck drill string.