Sigma/porosity tools with neutron monitors

Radiant energy – Geological testing or irradiation – Well testing apparatus and methods

Reexamination Certificate

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Reexamination Certificate

active

07365307

ABSTRACT:
A tool for formation logging includes a support configured for movement in a borehole; a neutron source disposed on the support; a neutron monitor disposed on the support and configured to monitor an output of the neutron source; a gamma-ray detector disposed on the support and spaced apart from the neutron source; and a shielding material disposed between the gamma-ray detector and the neutron source.

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Wilson, Robert D., “Bulk Density Logging with High-Energy Gammas Produced by Fast Neutron Reactions with Formation Oxygen Atoms,” Nuclear Science Symposium and Medical Imaging Conference Record, 1995., 1995 IEEE (Oct. 21-28, 1995) vol. 1, pp. 209-213.

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