It is well known that the large CNL sensitivity to the presence of gas in a rock formation is reduced by the existence of borehole fluid invasion. There is little precise knowledge about how invasion influences the porosity indication of the CNL tool, and only limited information CQ,n be obtained experimentally. Using mathematical models of the CNL tool based on multidimensional radiation transport techniques, the tool response for many varied enviro1lmental conditions has been successfully modeled. These models have been used recently to predict tool responses when borehole fluid invasion is present. The results of this study are discussed in this paper. Printed in U.S.A. I· f i .; ~ .
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