drill string

Also found in: Dictionary, Acronyms, Wikipedia.

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 ?

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.

Numerical Simulation of the Drill String Buckling Behavior in Horizontal Wells Considering the Orthotropic Friction

The drill string consisted of drill pipe with upset connections both inside and outside, thus producing internal dual diameters.

Shore approaches for fiber optics cable in arctic conditions

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.

Prediction Model of Mechanical Extending Limits in Horizontal Drilling and Design Methods of Tubular Strings to Improve Limits

The buckling behavior of the rotational drill string in horizontal well is affected by many factors.

Experimental Investigation and Analysis of Dynamic Buckling of Drill String in Horizontal Well

To dilute the potentially hazardous gas in the coal seams, air from portable compressors was used in addition to supplement the mine's ventilation system, sending air at 1,700 cfm down the annulus of the drill string.

A new approach to shaft development work: Raisebor engineers the largest diameter raise in the Alabama coalfields

This innovation replaces rotation of the entire drill string with independent rotation of the drill head, using a downhole turbine-driven mechanism.

Turning the well

(3) The nonzero time propagation of the torsional force disturbances along the drill string is neglected.

Design of telerobotic drilling control system with haptic feedback

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.

Effects of mud properties, hole size, drill string tripping speed and configurations on swab and surge pressure magnitude during drilling operations

Logging of the well bore provides drillers with details of the location and position of the drill string, and detailed formation evaluation.

High-temperature semiconductor solutions

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.

Atlas Copco takes over UK H&F Drilling Supplies

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.

NOV and Schlumberger form IntelliServ joint venture

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.