Radiant energy – Geological testing or irradiation – Well testing apparatus and methods
Patent
1979-07-09
1981-11-24
Smith, Alfred E.
Radiant energy
Geological testing or irradiation
Well testing apparatus and methods
250265, 250269, G01V 500
Patent
active
043026699
ABSTRACT:
Method and apparatus for pulsed neutron logging employing detectors of different energy-dependent sensitivities to neutrons at energy levels less than the chemical binding energy of hydrogen in hydrogenous fluids found in subterranean formations. Fast neutrons from the pulsed neutron source enter the subterranean formation under investigation and are moderated therein to form populations of slow neutrons during a thermalization period occurring subsequent to the fast neutron burst and a thermal equilibrium diffusion period occurring subsequent to the thermalization period. The detectors are employed to obtain count rate measurements during at least one and preferably two time windows falling within the thermalization period and during a later time window occurring within the thermal equilibrium diffusion period. The count rate measurements may be employed in order to arrive at a parameter representative of the time constant of the thermalization period in order to characterize the formation with respect to its relative oil-water content.
REFERENCES:
patent: 3487211 (1969-12-01), Youmans
patent: 3497692 (1970-02-01), Mills
patent: 3800150 (1974-03-01), Givens
Allen Linus S.
Mills, Jr. William R.
Fields Carolyn E.
Gilman Michael G.
Hager George W.
Huggett C. A.
Mobil Oil Corporation
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