G - Physics – 01 – V
Patent
G - Physics
01
V
358/4
G01V 5/10 (2006.01)
Patent
CA 1138573
ABSTRACT OF THE DISCLOSURE In the exemplary embodiments of the invention disclosed, thermal neutron decay characteristics of an earth formation, e.g. the thermal neutron decay time constant and the macroscopic capture cross section , are measured by detecting indications of the thermal neutron concentration in the formation during a selected set of two different measurement intervals between neutron bursts and forming a ratio of such measurements, as accumulated for an appropriate length of time, from which the measured value of the decay characteristic is derived. The particular set of measurement intervals used is selected from among a number of possible sets as a function of a previously measured value of the decay characteristic. Each measurement interval set is used over only a specific range of decay characteristic values for which it has been determined, in accordance with a previously established relationship between the decay characteristic value and the ratio of the thermal neutron concentration measurements for the set. The measured value of the decay characteristic is then determined from the actual measured value of the ratio for the selected measurement interval set and the previously established relationship for that set. Each measurement interval perferably consists of a plurality of contiguous, discrete time gates whose durations and times of occurrence are adjustable in common by a finite number, e.g. four, of discrete scale factor values F, each corresponding to a specific range of decay characteristic values.
338254
Schlumberger Canada Limited
Smart & Biggar
LandOfFree
Method and apparatus for measuring thermal neutron decay... does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Method and apparatus for measuring thermal neutron decay..., we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Method and apparatus for measuring thermal neutron decay... will most certainly appreciate the feedback.
Profile ID: LFCA-PAI-O-332562