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1. 发明申请

US20100257927A1 Electromagnetic Free Point Tool and Methods of Use 有权
标题翻译：电磁自由点工具及使用方法
公开(公告)号：US20100257927A1
公开(公告)日：2010-10-14
申请号：US12421241
申请日：2009-04-09
申请人： John E. Smaardyk , Jose A. Garcia Garcia
发明人： John E. Smaardyk , Jose A. Garcia Garcia
IPC分类号： E21B47/09 , E21B31/06
CPC分类号： E21B47/09
摘要： Electromagnetic free point tools are configured to determine the free point of a downhole pipe in a wellbore utilizing the amplitude or phase change in a transmitted signal for stressed and unstressed pipe. Certain examples of electromagnetic free point tools comprise a housing, one or more transmitter coils, one or more receiver coils, each coil spaced apart from one another, a power source for applying an oscillating voltage to the one or more transmitter coils which then induces a current in the receiver coil(s), and electronics for measuring the induced current in the receiver coil(s). In another embodiment, at least one of the coils is axially adjustable in position within the tool to permit the relative distance between coils to be adjusted to optimize performance of the tool in various conditions. By measuring the amplitude or phase of the induced current relative to the oscillating voltage, a log of the amplitude or phase is generated while passing the tool through a length of unstressed pipe. This process may be repeated while applying a stress to the pipe to generate a second log. By comparing the amplitude or phase of the first and second logs, the free point of the pipe may be ascertained by determining when and where the two logs diverge. This method can also be used to locate collars and measure pipe thickness.
摘要翻译：电磁自由点工具被配置为利用应力和无应力管道的发射信号中的振幅或相位变化来确定井筒中的井下管道的自由点。电磁自由点工具的某些示例包括壳体，一个或多个发射器线圈，一个或多个接收器线圈，每个线圈彼此间隔开的电源，用于向一个或多个发射器线圈施加振荡电压的电源，接收器线圈中的电流和用于测量接收器线圈中的感应电流的电子装置。在另一个实施例中，线圈中的至少一个可在工具内的位置轴向调节，以允许在各种条件下调节线圈之间的相对距离以优化工具的性能。通过测量相对于振荡电压的感应电流的振幅或相位，在通过一定长度的无压力管道时产生振幅或相位的对数。在向管道施加应力以产生第二对数时可以重复该过程。通过比较第一和第二原木的幅度或相位，可以通过确定两个原木发散的时间和位置来确定管道的自由点。该方法也可用于定位套管并测量管道厚度。

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