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 ?
The drill string consisted of drill pipe with upset connections both inside and outside, thus producing internal dual diameters.
A development that appeared in the 1960s is "coiled tubing"--the drill string is a single tube delivered in a coil as much as 1,500 meters in length.
Thus, by plotting data obtained from the developed computer programme, effects of mud properties, hole size, drill string tripping speed and configurations on swab and surge pressure magnitude can be predicted during drilling operations
By machining the part from a single large forging, Stabil Drill eliminates the possibility of a broken weld stranding a multi-million-dollar drill string down an expensive borehole.
The DSR sends radio and microwaves into the earth from a drill string (vertical drill rods, horizontal directional drill rods, etc.
An inner core barrel just above the bit at the bottom of the drill string is retrieved by a wire cable that travels down the center of the drill pipe.
A big problem with working in the polar regions is icebergs--as the Leg 113 ice observer reportedly joked, the sound of the drill string is a mating call for icebergs.
In order to achieve the full engineered benefits of the XT thread, however, one must consider the drill string as a system of connections between the shank adapter, rods and the bit in extension drilling applications.
New downhole tooling for the Grundodrill 4X compact HDD rig improves safety and simplifies drilling operations by allowing users to disconnect the sonde housing segment from the drill string after the pilot bore is complete.
Drilling products company Superior Drilling Products (NYSE MKT:SDPI) reported on Friday that it will supply its Strider Drill String Oscillation System (Strider) and related services pursuant to an agreement with Baker Hughes, a supplier of oilfield services, products, technology and systems.
It includes the option to save drill string configurations for future reference and streamline ordering of replacement parts.