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    • 7. 发明申请
    • Exit window milling assembly with improved restraining force
    • 出口窗铣削组件具有改进的约束力
    • US20070261840A1
    • 2007-11-15
    • US11434358
    • 2006-05-15
    • Calvin StoweEvan LewisMohan SoniDaniel Hart
    • Calvin StoweEvan LewisMohan SoniDaniel Hart
    • E21B23/03
    • E21B29/06
    • An assembly for milling a window in a tubular features a layout that keeps a restorative force normal to the whipstock slope acting on the window mill to help it track the whipstock ramp long enough for making an exit at the desired location. A string mill assembly is made long enough to allow such a restorative force to be created on the window mill as it advances down the ramp. The bearing or cutting structures on the string mill are positioned with respect to the window mill so that either the top of the string mill or at least the first bearing structure above the window mill presents at the top of the window as the window mill arrives at the position where it is desired that it make an exit. The lower bearing structure of the string mill also preferably has a rounded profile to facilitate its entrance on to the whipstock ramp without getting in a bind on the tubular wall adjacent the top of the window.
    • 用于铣削管道中的窗口的组件具有一种布局,其将恢复力保持垂直于作用在窗玻璃上的造斜斜坡,以帮助其跟踪造斜斜坡,足以使其在所需位置处出口。 弦碾机组件被制成足够长的时间,以允许在窗碾机上沿着斜坡进入时产生这样的修复力。 串磨机上的轴承或切割结构相对于窗口磨机定位,使得当研磨机到达时,弦磨机的顶部或窗玻璃上方的至少第一轴承结构呈现在窗口的顶部 希望它退出的位置。 串磨机的下轴承结构也优选具有圆形轮廓,以便于其进入造斜坡坡道而不会在邻近窗口顶部的管状壁上结合。