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公开(公告)号：US20070163806A1
公开(公告)日：2007-07-19
申请号：US11654195
申请日：2007-01-17
IPC分类号： E21B47/18
摘要： A method and system for controlling a horizontal directional drilling machine having a boring tool. A rate of rotation and a rate of thrust are selected by an operator. Controls allow an automatic boring operation mode to be initiated to maintain the selected rate of rotation and thrust without further input from the operator. Periodically, when the rotation and thrust are interrupted, such as to modify the drill string, the automatic boring operation mode is interrupted. The automatic boring operation mode may be resumed without requiring the operator to select the rate of rotation and rate of thrust. The rate of rotation is resumed before the rate of thrust to reduce drill string shock loads and increase drilling performance.
摘要翻译： 一种用于控制具有钻孔工具的水平定向钻孔机的方法和系统。 旋转速度和推力比由操作者选择。 控制器允许启动自动钻孔操作模式以保持所选择的旋转和推力，而无需来自操作者的进一步输入。 周期性地，当旋转和推力中断时，如修改钻柱，自动钻孔操作模式被中断。 可以恢复自动钻孔操作模式，而不需要操作者选择旋转速率和推力。 在推力减小钻柱冲击载荷之前恢复旋转速度并增加钻井性能。
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公开(公告)号：US06439319B1
公开(公告)日：2002-08-27
申请号：US09517967
申请日：2000-03-03
IPC分类号： E21B706
摘要： A drill head for an apparatus for directional boring according to the invention includes a bit, a holder for a device for detecting angular orientation of the bit, and a hammer including a striker for delivering impacts to the bit, wherein the bit assembly, holder and hammer are connected head to tail with the bit at a front end. The bit of the invention has a frontwardly facing main cutting surface having a plurality of main cutting teeth disposed thereon and a gage tower extending radially outwardly from the main cutting surface, which gage tower has at least one frontwardly facing gage cutting tooth thereon suitable for cutting over an angle defined by less than a full rotation of the bit. The device for detecting angular orientation is in a predetermined alignment with the gage tower so that it determines the orientation of the gage tower relative to the axis of rotation of the drill head. A starter rod may be used to connect the holder to the string, and the hammer generally follows immediately behind the bit, so that order of components from front to rear is bit, hammer, holder and starter rod. In one preferred embodiment, the main cutting surface is substantially flat and circular and has fluid ejection ports thereon, and the drill head has passages for conducting a drill fluid therethrough to the ejection ports. In another preferred embodiment, the bit has a heel on an outer side surface thereof at a position opposite the gage tower, which heel slopes inwardly from back to front. The heel aids in steering the bit in both rock and soil. Such a drill head can be used for directional boring in mixed conditions including soil, soft rock and even hard rock.
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