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    • 3. 发明授权
    • Rotary-percussion gang drill with circumferentially floating offset bits
    • 具有圆形浮动偏置位置的旋转冲击钻
    • US3682258A
    • 1972-08-08
    • US3682258D
    • 1970-06-22
    • HUGHES TOOL CO
    • KELLY JOSEPH L JRWOODS HENRY B
    • E21B4/16E21B10/56E21B1/06E21B3/12E21B5/00
    • E21B4/16E21B10/56
    • A big hole drill in which a multiplicity of parallel downhole percussion drills are secured to a common framework for joint rotation therewith. The drills may be supplied with operating fluid from a common manifold, but each drill hammers independently of the others. The individual drill has a percussion bit secured to and depending from its forward end, the bit being mounted for limited axial movement relative to the drill so that the hammering action of the drill on the bit drives it forward into a rock formation. The improvement lies in mounting those bits which are offset from the axis of rotation of the assembly so that each bit is circumferentially floating with respect to its associated drill. In operation each such offset bit is rotated relative to its drill to bring different portions of its peripheral cutting structure into contact with the sidewall of the kerf formed by the row of bits in which it is located. The inventors have discovered that the offset bits thus mounted are rotated by contact with the formation as the entire assembly is rotated, distributing the wear on the bits and causing them to drill a full size hole.
    • 一个大钻孔钻头,其中多个平行的井下冲击钻头固定到共同的框架上,用于与其共同旋转。 钻头可以从普通歧管提供工作流体,但是每个钻头独立于其他钻锤。 单个钻具具有固定到其前端并从其前端离开的打击针头,钻头被安装成相对于钻头有限的轴向运动,使得钻头在钻头上的锤击动作将其向前推入岩层。 改进在于安装偏离组件的旋转轴线的位,使得每个钻头相对于其相关联的钻头沿周向浮动。 在操作中,每个这样的偏移位相对于其钻头旋转,以使其周边切割结构的不同部分与由其所位于的位排形成的切口的侧壁接触。 本发明人已经发现,当整个组件旋转时,这样安装的偏移钻头通过与地层接触而旋转,将磨损分布在钻头上并使钻头钻出全尺寸孔。