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drill string

   Also found in: Dictionary/thesaurus, Acronyms, Wikipedia 0.01 sec.
drill string [′dril ‚striŋ]
(mechanical engineering)
The assemblage of drill rods, core barrel, and bit, or of drill rods, drill collars, and bit in a borehole, which is connected to and rotated by the drill collar of the borehole.


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National Oilwell Varco (NOV) and Schlumberger have created a joint venture to provide high-speed drill string telemetry systems to improve the efficiency and safety of oil and gas operations.
Recent safety alerts reveal lessons learnt from incidents including an electric shock while carrying out routine maintenance on lighting systems, electrical arc flash injury involving an extension cord, confined space activity resulting in loss of consciousness and a dropped drill string.
Deep bores expose the drill string to unpredictable working pressures and temperature extremes.
 
 
 
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