Drill pipe

Drill pipe
Pipe rack.jpg
Drill pipe.jpg

Drill pipe, is hollow, thick-walled, steel piping that is used on drilling rigs to facilitate the drilling of a wellbore and comes in a variety of sizes, strengths, and weights but are typically 30 to 33 feet in length. They are hollow to allow drilling fluid to be pumped through them, down the hole, and back up the annulus.

Because it is designed to support its own weight for combined lengths that often exceed 1 mile down into the Earth's crust, the case-hardened steel tubes are expensive, and owners spend considerable efforts to reuse them after finishing a well, replacing the drill stems with thinner walled tubular casing, tapping the natural resources of oil reservoirs. Used drill stem is often sent to a yard for inspection, sorted, and stored until new drill sites can be explored. Modified instruments similar to the spherometer are used at inspection sites to identify defects in the metallurgy, in order to prevent fracture of the drill stem during future wellboring.

Drill pipe is a portion of the overall drill string. The drill string consists of both drill pipe and the drill stem which is the tubular portion closest to the bit or downhole assembly. Drill pipe and drill stems can be differentiated in that the drill pipe is quite flexible and produced in longer segments whereas the drill stem is much more rigid and manufactured in shorter task specific segments.

See Drilling rig (petroleum) for a diagram of a drilling rig.


Anderson, Robert O. (1984). Fundamentals of the Petroleum Industry. Norman, Oklahoma: University of Oklahoma Press. ISBN 0585194750. 

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Look at other dictionaries:

  • drill pipe — noun or drill rod : a pipe or rod that drives a rotary drill bit (as in drilling wells) * * * (in oil well drilling or the like) any of several coupled tubes for rotating the bit and supplying drilling mud. * * * drill pipe, a pipe for driving a… …   Useful english dictionary

  • drill pipe — (in oil well drilling or the like) any of several coupled tubes for rotating the bit and supplying drilling mud. * * * …   Universalium

  • Stand (drill pipe) — A Stand (of drill pipe) is 2 or 3 joints of drill pipe connected together and stood in the derrick vertically, usually while tripping pipe.See Drilling rig (petroleum) for a diagram of a drilling rig …   Wikipedia

  • drill collar — drill collar, a joint of hollow steel pipe fastening the drill pipe to the bit …   Useful english dictionary

  • Drill string — A drill string on a drilling rig is a column, or string, of drill pipe that transmits drilling fluid (via the mud pumps) and torque (via the kelly drive or top drive) to the drill bit. The term is loosely applied as the assembled collection of… …   Wikipedia

  • Drill Stem Test — A drill stem test (DST) is a procedure for isolating and testing the surrounding geological formation through the drill stem. The test is a measurement of pressure behavior at the drill stem and is a valuable way to obtain important sampling… …   Wikipedia

  • Pipe rack — A Pipe rack is a set of steel framed structures (typically triangularly shaped) that drill pipe is stacked on for storage or when being readied for use on a drilling rig.Pipe rack also refers to the wooden pad on the drill floor where the stands… …   Wikipedia

  • Drill line — …   Wikipedia

  • drill stem — noun : the string of drill pipe that transmits power from the surface down to the drill bit in well drilling * * * drill stem, the part of a rotary drill that transmits power from the rotary table to the bit that grinds and crushes rocks. * * * n …   Useful english dictionary

  • drill rod — noun carbon steel used for rock drills and dowels • Syn: ↑drill steel • Hypernyms: ↑carbon steel * * * I. noun see drill pipe II. noun see …   Useful english dictionary

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