| 摘要 |
Method for locating the presence of passageways formed longitudinally of a borehole which communicates a production zone with a second zone, by placing isotopes adjacent the well casing at spaced apart locations above and below the perforated zone, and by placing spaced apart second isotopes adjacent the borehole annulus above and below the perforated zone of the borehole. The first spaced apart isotopes have a half life or decay rate substantially different from the second isotopes, and accordingly, translocation of either of the isotopes may be traced with radiation measuring apparatus.
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