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An experimental study of the performance of a radioactive tracer flow log has been conducted in Loudon pilot wellbores and in a visual flow loop. The major results of this study are are follows. (1) When a viscous polymer solution is being injected into a wellbore, injection flow profiles as measured by a conventional tracer log are likely to be erroneous and completely misleading. (2) Because polymer solutions are usually injected at rates wherein laminar flow exists in the wellbore, tracer must be ejected at a velocity that is just sufficient to place the tracer in substantially the center of teh annular region between the tool and the wellbore. Tracer ejected at too high a velocity will travel to the casing or wellbore wall and subsequently move at a rate that is significantly less than the true average annular velocity. Tracer ejected too close to the log tool will incur the same problems. (3) The tracer ejector of a conventional tool can be modified to reduce the velocity of the injected tracer by increasing the number of ports, the diameter of the ports, or both, as needed to place the tracer near the center of the annular region. (4) Reasonablymore » accurate flow profiles have been measured for injected fiscous microemulsion and polymer drive water using a modified tracer flow log. (JMT)« less |
