Heavy Weight Drill Pipe is one drilling tool which has a medium-weight and similar todrill pipe. Wall thickness is larger than that of the drill pipe, and it is smaller than drill collarGenerally add between the drill pipe and drill collar when compose the drill string, toprevent mutation of cross section of drll string, and reduce the fatigue of drll pipe. When used in directional wel, it can dillwithhigh speed under the condition of lower torque, which reduce the wear and tear of the drll string. Due to the smal sidewalcontact area, it is not easy to form differential pressure sticking. Product standards: API 7-1, API7-2
The Non-magnetic compressive service drill pipes are made of low carbon stainless steel.acc.to API Spec.7 and SY/T5144. All threads are phosphated,copperized or coldworked. All Connections areequipped with pressed steel thread protectors. All threadsare machined with CNC Lathes-Doubleshouldered and special threads.
Non-magnetic compressive service drill pipe specification
Mechanical property refer to Non-maganetic drill collars
磁性能 Magnetic Properties
( 磁场=1 X 105/4πA/m)
Magnetic field gradient：△B<0.05μ T