NMR logging apparatus and methods for fluid typing
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United States of America Patent
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Apr 2, 2002
Grant Date -
N/A
app pub date -
Oct 28, 1999
filing date -
Oct 30, 1998
priority date (Note) -
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Abstract
A novel method and apparatus is disclosed for the separation of fluid phases in NMR borehole measurements. The method is based on selecting an optimum contrast mechanism and a corresponding set of measurement parameters for a particular borehole environment. The contrast mechanism can be based on diffusion, relaxation time or hydrogen index differences between different types of fluids. Once an initial measurement is made, the measurement parameters are compared to a predetermined set of values to broadly estimate the types of fluids present in the geologic environment. If necessary, the measurement is repeated to obtain optimal fluid typing for the estimated fluid types.
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