Radiant energy – Geological testing or irradiation – Well testing apparatus and methods
Patent
1993-01-21
1994-09-20
Hannaher, Constantine
Radiant energy
Geological testing or irradiation
Well testing apparatus and methods
250262, 2502691, G01V 510
Patent
active
053491840
ABSTRACT:
The porosity of the subsurface earth formation surrounding a borehole is investigated by measuring the populations of epithermal neutrons at detector locations longitudinally spaced from a neutron source. During this measuring process, a detector is located at the matrix density neutral (MDN) distance from the neutron source at which the matrix density effects of the earth formation are significantly reduced. The porosity measurements are determined from neutron counts detected at both the MDN location and other detector locations to derive formation porosity measurements which have reduced lithology and matrix density effects. Because of these reduced effects, the derived formation porosity values do not need to be substantially corrected to account for lithology and matrix density effects. In addition, the formation lithology and matrix density may be obtained from measurements taken at the MDN location and other detector locations.
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Dunn Drew A.
Garrana Henry N.
Hannaher Constantine
Schlumberger Technology Corporation
Walker Darcell
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