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    • 8. 发明授权
    • Earth-boring tools and methods of forming such earth-boring tools
    • 钻孔工具和形成这种钻孔工具的方法
    • US08851207B2
    • 2014-10-07
    • US13101840
    • 2011-05-05
    • David GaviaNicholas J. LyonsJuan Miguel BilenDanny E. ScottRudolf Carl Pessier
    • David GaviaNicholas J. LyonsJuan Miguel BilenDanny E. ScottRudolf Carl Pessier
    • E21B10/36E21B10/55E21B10/60
    • E21B10/43E21B10/55E21B10/5673E21B10/602
    • Earth-boring drill bits comprise a bit body having a plurality of radially extending blades and a plurality of cutting elements attached to the plurality of radially extending blades. Only gouging cutting elements are attached to at least one blade of the plurality of radially extending blades. Only shearing cutting elements are attached to at least another blade of the plurality of radially extending blades. Only shearing cutting elements are attached to a number of blades of the plurality of radially extending blades that is different from a number of blades of the plurality of radially extending blades to which only gouging cutting elements are attached. Methods of forming an earth-boring drill bit comprise forming a bit body including a plurality of radially extending blades. Only shearing cutting elements are attached to a number of blades different from a number of blades to which only gouging cutting elements are attached.
    • 钻孔钻头包括具有多个径向延伸叶片的钻头体和附接到多个径向延伸叶片的多个切割元件。 仅将多个切割元件的切割元件附接到多个径向延伸的叶片中的至少一个叶片。 只有剪切切割元件附接到多个径向延伸的叶片中的至少另一个叶片。 只有剪切切割元件附接到多个径向延伸的叶片中的多个叶片,其不同于多个径向延伸的叶片中的多个叶片,仅仅附着有切割元件。 形成钻孔钻头的方法包括形成包括多个径向延伸的叶片的钻头体。 只有剪切切割元件连接到不同于仅附着切割元件的多个叶片的多个叶片。