The Spectral Log For Chlorine Detection
The technique used by one service company to detect the presence of chlorine in borehole environments by nuclear spectroscopy methods is presented. Particular emphasis is placed on borehole conditions such as water salinity, porosity, invasion, and cement thickness that influence the results obtainable. From an understanding of the effect of these factors on log response the limitations quantitative evaluation of absolute chlorine concentrations of formation fluids is made evident. A tabulation relating the success/failure ratio of interpretation, to the extent advocated, is presented illustrating that when properly used the log is extremely valuable in indicating the presence or absence of chlorine in formation fluids.
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