Radiant energy – Geological testing or irradiation – Well testing apparatus and methods
Patent
1994-01-11
1995-05-30
Hannaher, Constantine
Radiant energy
Geological testing or irradiation
Well testing apparatus and methods
2502691, G01N 510
Patent
active
054204224
ABSTRACT:
The first and second moments of an epithermal neutron slowing down time curve are determined and are combined in accordance with a predetermined empirical relationship to derive a raw measurement of the porosity of an earth formation surrounding a borehole. The raw porosity value is then combined with the second moment in accordance with further predetermined empirical relationships to derive a standoff measurement and a standoff-correction factor to be applied to the raw porosity measurement to produce a standoff-corrected porosity measurement. Where the raw porosity value changes appreciably from depth level to depth level, a differential spatial filter is applied to the raw porosity measurement and to the standoff-correction factor to provide a more precise standoff-corrected porosity measurement.
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Berkley Richard G.
Hannaher Constantine
Pojunas Leonard W.
Schlumberger Technology Corporation
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