drill string

Aug 14th, 2016
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The Drill StringDrill PipeThe bulk of the drill string ( Figure 1 ) is made up primarily of lengths of steel drill pipe, which provides length to thedrill string and transmits rotational energy to the drill bit.Figure 1Drill pipe ( Figure 2 : Courtesy of Smith International Incorporated ) consists of hollow steel tubes to which are weldedtool joints: a threaded "pin" (usually at the bottom end) and a threaded "box" (usually on the upper end ( Figure 3 )).Figure 2Figure 3The American Petroleum Institute (API) establishes standards for pipe sizes, as well as for variations on the threadtypes and thicknesses of the box and pin "tool joints." Drillpipe is available in a variety of strengths and is generallysupplied in "joints" that are about 30 ft (9.1 m) long and anywhere from 2 3/8 to 6 5/8 inches (6 to 17 cm) in diameter .Drill pipe should never be subjected to high torque or compressional forces, since it could easily "twist off". (Theexception to this rule is horizontal drilling, where the pipe is run in compression in the lateral hole section. Insituations like this, heavy weight pipe specifically designed for compressive service is used).Bottomhole Assembly (BHA)Between the drill pipe and the drill bit is the section of the drill string kown as the Bottomhole Assembly (BHA),which consists mainly of drill collarsheavier and thicker than drill pipe, with larger outside diameters and smallerinside diameters, and with connections that are machined

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