TRACER PLACEMENT TECHNIQUES FOR IMPROVED RADIOACTIVE TRACER LOGGING.

A new tracer logging method, the two-pulse log, depends on the maintenance of sharp peaks of the tracer slugs. The accuracy of a radioactive tracer log thus depends on the way in which the tracer is introduced into the wellbore and how it mixes and disperses in the wellbore fluid. We have conducted experiments in a model wellbore to determine the factors affecting tracer slug distribution and their resulting responses at tracer detectors. The tracer placement parameters studied included tracer shot velocity, shot duration, and wellbore flow rate. Based on the results, it is clear that radioactive tracer log quality can be significantly improved by using the newer logging tools that allow for careful control of shot duration. With a few test shots in the upper part of the wellbore, optimum tracer placement techniques for a given well can be determined.

TRACER PLACEMENT TECHNIQUES FOR IMPROVED RADIOACTIVE TRACER LOGGING. Conference Paper