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    • 6. 发明授权
    • Downhole depth correlation
    • 井下深度相关
    • US6151961A
    • 2000-11-28
    • US264391
    • 1999-03-08
    • Klaus B. HuberSteven W. HendersonJames W. Babineau
    • Klaus B. HuberSteven W. HendersonJames W. Babineau
    • E21B41/00E21B47/00E21B47/09G01B1/00
    • E21B47/09E21B41/00E21B47/00
    • A tool for initiating a downhole function in a subsurface well, such as a cased well. The tool has memory adapted to store a well-specific reference pattern of one or more downhole well characteristics as a function of position along the well, one or more sensors responsive to the downhole well characteristics, and a clocked processor. The processor is adapted to receive well characteristic signals from the sensors, determine, from the signals and the reference pattern in memory, the position of the tool along the well, and automatically initiate a downhole function at a preprogrammed position along the well while the tool is moved at a substantially constant rate along the well. The tool may be configured in a string of tools for performing multiple downhole functions. In some embodiments the reference pattern is the known spacing of discrete downhole features, such as casing collars. In some other embodiments the reference pattern is a log of a geophysical parameter, such as a natural gamma log. Methods of use are also disclosed.
    • 用于在地下井中启动井下功能的工具,例如套管井。 该工具具有存储器,其适于存储根据井的位置的函数的一个或多个井下井特征的特定参考图案,响应于井下井特征的一个或多个传感器以及时钟处理器。 处理器适于从传感器接收良好的特征信号,从存储器中的信号和参考图案确定工具沿着井的位置,并且在沿着井的预编程位置处自动启动井下功能,而工具 沿着井以基本恒定的速率移动。 该工具可以被配置在用于执行多个井下功能的工具串中。 在一些实施例中,参考图案是离散井下特征(例如套管套)的已知间距。 在一些其他实施例中,参考图案是地球物理参数的对数,例如自然伽马对数。 还公开了使用方法。