Invention Grant
US07677338B2 System, method, and apparatus for passive and active updrill features on roller cone drill bits 有权
滚子锥钻头上的被动和主动式更新功能的系统,方法和装置

System, method, and apparatus for passive and active updrill features on roller cone drill bits
Abstract:
Strategically placed hardfacing material near the shank end of a drill bit above the transition edges provides additional protection for compensator areas and the upper leg surfaces of drill bits during updrilling and/or backreaming operations. The strategically located hardfacing is typically passive in the normal drill mode, but active in the updrill drilling mode and/or back reaming. Alternative designs including other strategic material placement, the formation of hardfacing materials in tooth/wear design shapes, bimetallic gage, graded composite hardfacing materials, recesses or cavities at edges of the outer diameter, and various methods of applying the material also may be employed.
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