Methods and apparatus for environmental correction of thermal ne

Details Methods and apparatus for environmental correction of thermal ne Methods and apparatus for environmental correction of thermal ne

1981-09-14

1984-04-24

Smith, Alfred E.

Radiant energy

Geological testing or irradiation

Well testing apparatus and methods

250270, G01V 510

Patent

active

044450338

ABSTRACT:
An on-line environmentally-corrected measurement of the thermal neutron decay time (.tau.) of an earth formation traversed by a borehole is provided in a two-detector, pulsed neutron logging tool, by measuring .tau. at each detector and combining the two .tau. measurements in accordance with a previously established empirical relationship of the general form:

REFERENCES:
patent: 3509342 (1970-04-01), Dewan
patent: 3818225 (1974-06-01), Smith
patent: 3859524 (1975-01-01), Nelligan
patent: 3890501 (1975-06-01), Johnstone
patent: 4223218 (1980-09-01), Jacobson
patent: 4224516 (1980-09-01), Johnstone
patent: 4350888 (1982-09-01), Peelman
Randall, "Time Derived Sigma for Pulsed Neutron Capture Logging," Middle East Oil Tech. Conf. of Soc. Petro. Eng., Manama, Bahrain, Mar. 9-12, 1981.

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