| 摘要 |
An apparatus for locating cement plugs and other devices downhole in a wellbore. A cement plug is moved downhole into a wellbore through a casing, and a transmitter sends a signal to a receiver. A processor engaged with the receiver identifies the elevation or location of the cement plug. Accurate placement of the cement plug eliminates problems associated with underplacement and overplacement of cement in a wellbore.
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