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详情
Drill Collar is mainly used to provide bit weight to drill bit so
that drill pipe is in tension. Especially drill collar can keep
drill bit centralized and hole track by large rigidity. TIANHE
brand drill collars are manufactured strictly from API Spec**1 and
SY***1 standard.The wall thickness of heavy weight drill pipe is
between drill pipe and drill collar, its structure is similar with
drill pipe. It is made from premium alloyed steel. Its both tool
joints and middle upset are welded hardbands. Technical parameters
meet with API Spec**1 Standard.
