Drill Collar, Heavy Weight Drill Pipe, Kelly
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heavy weight drill pipe
Drill collars are manufactured from AISI 4145H or 36CrNiMo4 modified steel, and are supplied in the" as rolled" surface finish condition. Alternative surface finishes can be provided.
Integral heavy weight drill pipe is manufactured from AISI 4142H-4145H modified drill collar material according to SY/T 5146-1997, thick-walled pipe called integral heavy weight drill pipe was developed to provided a gradual transition from the heavy drill collars to the relatively light weight drill pipe.