Borehole fluid and/or casing effect correction for pulsed neutron measurements
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United States of America Patent
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Jun 12, 2018
Issued Date -
Dec 1, 2016
app pub date -
May 29, 2015
filing date -
May 29, 2015
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Abstract
A method for determining hydrogen index includes using measurements of gamma rays detected during operation of a pulsed neutron source and numbers of thermal neutron capture gamma rays made at at least two different axial spacings from a pulsed neutron source. Either a first ratio of or a first logarithm of the first ratio of the burst gamma rays is determined for a first and second axial distance from the neutron source. A second logarithm is determined of a second ratio of the thermal neutron capture gamma rays detected at a first axial spacing with respect to the numbers detected at a second axial spacing. A corrected second ratio of the numbers of thermal neutron capture gamma rays is determined using either (i) the first logarithm and (ii) the first ratio, and the second logarithm. The corrected second ratio is used to determine the hydrogen index.
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