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.
McGraw-Hill Dictionary of Scientific & Technical Terms, 6E, Copyright © 2003 by The McGraw-Hill Companies, Inc.
References in periodicals archive ?
In this paper, we regard the friction between the drill string and the borehole as the orthotropic friction, and establish a FE model for the horizontal drill string and the borehole system based on the finite element method.
The drill string consisted of drill pipe with upset connections both inside and outside, thus producing internal dual diameters.
Figure 11 shows the axial force distributions for different 5" drill string components including SDP, HWSDP (heavy weight steel drill string), and ADP With the increase of well depth, the axial force firstly increases and then decreases.
The buckling behavior of the rotational drill string in horizontal well is affected by many factors.
This innovation replaces rotation of the entire drill string with independent rotation of the drill head, using a downhole turbine-driven mechanism.
(3) The nonzero time propagation of the torsional force disturbances along the drill string is neglected.
In our work, effects of mud properties, drillstring tripping speed, and hole and drill string configuration; on swab and surge pressures were investigated by developing a computer code and transforming this code into a graphical technique.
Logging of the well bore provides drillers with details of the location and position of the drill string, and detailed formation evaluation.
H&F Drilling Supplies, which specialises in casing and piling applications and supplies all components in the drill string, is one of Atlas Copco's distributors in the country.
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.
To operate the drill, the hammer contains a water-driven piston that strikes the drill string adapter to create shock waves, which then travel through the drill string and into the drill bit.