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在解剖和分析美国瑞德公司牙轮钻头的基础上,四川省石油管理局总机厂钻头研究所与上海有色金属研究所合作,共同研制了81/2″XHP215ZR型铍青铜浮动套滑动轴承钻头
Based on the anatomy and analysis of American Rhede’s roller cone drill bits, the Drill Bit Institute of General Manager’s Factory of Sichuan Petroleum Administration jointly developed the 81/2 "XHP215ZR Beryllium Bronze Floating Sleeve Sliding Bearing Bit