Radiant energy – Geological testing or irradiation – Well testing apparatus and methods
Patent
1989-03-16
1990-11-20
Hannaher, Constantine
Radiant energy
Geological testing or irradiation
Well testing apparatus and methods
250262, 250266, 250267, 250268, G01V 510
Patent
active
049720821
ABSTRACT:
The porosity of an earth formation is derived in a plused neutron logging tool by use of a directionalized and borehole-shielded eptithermal neutron detector array and by processing detector count rate measurements of the epithermal neutron die-away curve in accordance with a multi-parameter fit to obtain as one parameter the epithermal neutron decay time of the formation and as a second parameter an indication of detector standoff (environmental) effects. The multi-parameter fitting procedure separates the formation and standoff effects on the measured count vs time curve, and yields a decay time measurement that is primarily representative of formation porosity and substantially free of environmental effects. To enhance count rate statistics, the neutron source and one or more of the epithermal neutron detector may be located at the same depth in the borehole. The neutron burst centroid is monitored an used to define a fiducial window for processing the die-way curve data.
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Le Poire David J.
Loomis William A.
Nelligan William B.
Hannaher Constantine
Schlumberger Technology Corporation
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