Original document(74 pages) Authorized document(65 pages) 中文版
    An underground drilling bit for underground drilling driven by a rotating drive source includes a drilling bit body which has a base part, a sizing part and a working surface part arranged around a drilling bit axial line. A basically continuous cutting teeth opening region is arranged on the sizing part around a forcing point, and a supporting device is arranged in the region and around the forcing point. A plurality of diamond cutters are arranged on the working surface to make the non-balance force component along a pure radial direction basically vertical to the drilling axial line and to form a pure radial non-balance force during drilling, to maintain the non-balance force for supporting the supporting device to contact the borehole wall, and to make the pure radial non-balance force have a balancing direction, therefore the force component can be returned to the balancing direction after a disturbing displacement is applied on the component.
Application Number
91104795 Application Date
Title 名称 Low friction subterranean drill bit and related methods
Publication Number
1058824 Publication Date
Approval Pub. Date 1995.11.15 Granted Pub. Date 1995.11.15
International Classification 分类号 E21B10/56
Applicant(s) Name
Amoco Corp.
Address 地址
Inventor(s) Name 发明人 J. Ford Brett;L. Allen Sinor;Tommy M. Warren
Attorney & Agent 代理人 ZHANG MINHUA

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