G - Physics – 01 – V
Patent
G - Physics
01
V
G01V 5/10 (2006.01)
Patent
CA 2171231
The invention is a system for determining the epithermal neutron decay rate of an earth formation penetrated by a wellbore. A method according to the present invention includes the steps of irradiating the formation with bursts of high energy neutrons from a source disposed on a logging tool, detecting epithermal neutrons at a first detector primarily sensitive to epithermal neutrons entering the tool from the earth formation, detecting epithermal neutrons at a second detector primarily sensitive to epithermal neutrons entering the tool from the wellbore, determining a first time at which a maximum counting rate occurs the first detector, scaling the count rates at the second detector to match the count rate at the first detector at the first time,determining a second time at which both detectors measure the same count rate ofthermal neutrons, and determining the formation epithermal neutron decay rate bysolving a linear least-squares fit function of the difference in counting rates between the first and the second detectors occurring between the first time and a predetermined portion of the second time.
Cassan Maclean
Western Atlas International Inc.
LandOfFree
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