drill string

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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.
References in periodicals archive ?
As a result, the drill string used by HDD for the pilot hole was selected to be used as the casing.
The drill strings were now tripped back and advanced to the south platform in order to create a continuous drill string.
Straighter holes relate to correct and appropriate drill strings and good control of thrust (or bit load), but this has nothing to do with computer control.
At 3900 meters, a hole wash-out and drill string corrosion caused part of the drill string to fall and stick, requiring a new section to be drilled down from about 3750 meters.
Those drill strings, which Vallourec will produce in its plants in France and in the Middle East, will be delivered to Abu Dhabi between mid-2016 and the start of 2017.
Drill strings can be saved by crew name, job, soil conditions or by other descriptive names.
In April 2008 Heerema Marine Contractors Australia signed a contract with Woodside Energy as operator, on behalf of Australia's NWSV (North West Shelf Venture), for the transport and installation of the North Rankin B Platform substructure and topside, and approached FSCL to tender for the design and build of two large pile top drills and three complete drill strings for the jacket installation works.
A contract for the delivery of 12 drill strings in sour service grade (VM105 DP SSE) equipped with VAM Express connections is inked by Vallourec and Baoji Oilfield Machinery Co.
Contract Awarded for Delivery of 12 drill strings in sour service grade (VM105 DP SSE) equipped with VAM Express connections.
The day of the pipe pullback, Patterson & Wilder provided a 15-man support crew to guide the drill strings into the pilot hole and complete the final welding and coating.
In addition, two of CLOV s drilling rigs are using Vallourec drill strings and connections, which are devoted to the most difficult drilling conditions, such as highly deviated or extended reach wells.
To operate successfully in this sensitive environment and expedite the completion of the project, Cherrington elected to use a method that would employ two drill strings threaded over one another.