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美国《石油工程师》1995年11月号报道：联合太平洋资源联合组织最近在现场试验了三只由PBI公司制造的4／英寸单牙轮钻头。这种单牙轮钻头是为小并限钻井而设计的，它有一个偏置牙轮、一个加长喷嘴和全稳定的钻头体；其轴承采用9％英寸三牙轮钻头的耐磨轴承。现场试验表明该钻头
United States “Petroleum Engineers” November 1995 report: United Pacific Resources Organization recently tested in the field of three manufactured by the PBI 4 / inch single cone bit. This single-cone bit is designed for small and limited drilling. It has a bias cone, an elongated nozzle and an all-round bit body; its bearings use a wear-resistant 9% inch triple-cone bit bearing. Field tests showed the drill bit