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    • 6. 发明授权
    • Rock bit with an extended center jet
    • 岩石与一个扩展的中心喷气机
    • US5853055A
    • 1998-12-29
    • US671517
    • 1996-06-27
    • Michael A. SirackiPer I. NeseAlan W. LockstedtDennis CisnerosMichael S. OliverGary R. Portwood
    • Michael A. SirackiPer I. NeseAlan W. LockstedtDennis CisnerosMichael S. OliverGary R. Portwood
    • E21B10/16E21B10/18
    • E21B10/18E21B10/16
    • A rotary cone bit for drilling bore holes in earth formations whose body has a thread pin end and a dome end from which extend three legs. A cutter cone is rotatably mounted to each leg and is radially oriented about the bit's central axis. Each cutter cone has a gage row of cutting elements extending from the cone surface nearest the mouth and a nose row extending nearest the cone's apex. A center jet for emitting fluid or mud is located on the dome. The jet has a converging nozzle with an exit orifice which extends below a predefined horizontal plane intersected by the cones or cutting elements. The exit orifice has a constant diameter for a length at least equal to its diameter for reducing the diffusion of the fluid or mud flow emitted. Fluid or mud emitted from the center jet travels substantially uninterrupted within a cylindrical space between the cones which is not invaded by any cutting element. This reduced diffusion substantially uninterrupted fluid flow strikes the bore hole bottom with maximum impact energy for enhanced removal of earth formation cuttings.
    • 一个用于在地层中钻孔的旋转锥形钻头,其主体具有螺纹针端和从其延伸三条腿的圆顶端。 切割锥体可旋转地安装到每个支腿上并且围绕钻头的中心轴线径向定向。 每个切割锥体具有从最接近嘴部的锥形表面延伸的切割元件的行列,以及最靠近锥体顶点延伸的鼻列。 用于喷射流体或泥浆的中心喷射器位于圆顶上。 喷射器具有会聚喷嘴,其具有出口孔,该出口孔延伸到与锥体或切割元件相交的预定水平面下方。 出口孔具有至少等于其直径的长度的恒定直径,用于减少发射的流体或泥浆流的扩散。 从中心射流发射的流体或泥浆在不被任何切割元件侵入的锥体之间的圆柱形空间内基本上不间断地行进。 这种减少的扩散基本上不间断的流体流动以最大的冲击能量撞击钻孔底部,以增强地球切屑的去除。