Metal & Oil & Gas News – 
Drill pipe, is hollow,
thick-walled, steel piping that is used on drilling rigs and horizontal drilling
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 well boring.
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.
Standard: API 5D and API 5DP
Grade: E75, X95, G105, S135
Thickness:
7.11 mm –12.7 mm
Outer Diameter: 2 3/8 inch – 5 1/2 inch
Place of Origin:
China
Application: Drill pipe
End Type: EU, IU, IEU
Surface Treatment:
Varnished or rust preventing paint
Packing: In bundles as per API
standard
