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
申请号
91104795 Application Date
申请日
1991.07.10
Title 名称 Low friction subterranean drill bit and related methods
Publication Number
公开号
1058824 Publication Date
公开日
1992.02.19
Approval Pub. Date 1995.11.15 Granted Pub. Date 1995.11.15
International Classification 分类号 E21B10/56
Applicant(s) Name
申请人
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

  
Orifice plate type rendering and painting (or whitewashing) machine
Bamboo Wood combined floor board and its producing technology
Reinforcing bar connector
Post-tensioned prestressed reinforcement field cold drawing and anchoring
Drilling pile method construction technology
Making rounded clusters of fibers
Weaving belts drawnwork product made process
Method for knitting processing end portion of fabric
Magnetic force loom
Textile processing employing stretching technique
Note:All patent data come from State Intellectual Property Office of the People's Republic of China. If there were discrepancies between here and the State Intellectual Property office, the later is more accurate. The patent data is only for public exchange and learning purposes. We are not responsible for the adverse consequences with unverified use of the data.