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    • 3. 发明授权
    • Well tool for detecting well bore deviation in drill string
    • 用于检测钻柱井眼偏差的井具
    • US4370814A
    • 1983-02-01
    • US170048
    • 1980-07-18
    • William T. Carpenter, Jr.
    • William T. Carpenter, Jr.
    • E21B47/022
    • E21B47/022
    • A well tool for detecting well bore deviation which includes a tool adapted to be connected between adjacent components of a drill string, including a longitudinal opening through which drilling fluid can be circulated. At least one vent hole is located in the tool wall for communicating the longitudinal opening with the space outside the tool through which drilling fluid is circulated back to the surface, the vent hole being selectively blocked and unblocked. The angle the tool has deviated from vertical is measured and the vent is unblocked at a time interval after weight is placed on the bit which is determined by the amount of deviation of the tool, the unblocking of the vent causing a pressure drop in the drilling fluid in the tool the timing of which indicates the amount of deviation.
    • 一种用于检测井眼偏差的井具,其包括适于连接在钻柱的相邻部件之间的工具,其包括可以循环钻井液的纵向开口。 至少一个通气孔位于工具壁中,用于将纵向开口与工具外部的空间连通,钻孔流体通过该空间循环回到表面,通气孔被选择性地阻断和解除阻塞。 测量工具偏离垂直角度的角度,并且在将重量放置在由工具的偏离量确定的钻头上的时间间隔之后的时间间隔内解除通气孔,排气孔的解除阻塞导致钻孔中的压降 工具中的流体,其时间表示偏差量。