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....
Tianhe Oil Group is a comprehensive enterprise of equipment manufacturing and oilfield service providing. The company is specialized in innovation, manufacture and sales of drill and petroleum....
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....