Methods and apparatus for environmental correction of...

Details Methods and apparatus for environmental correction of... Methods and apparatus for environmental correction of...

E - Fixed Constructions

21

B

166/3

E21B 47/06 (2006.01) G01V 5/10 (2006.01)

Patent

CA 1182741

Methods and Apparatus for Environmental Correction of Thermal Neutron Logs Abstract An on-line environmentally-corrected measurement of the thermal neutron decay time (?) of an earth formation traversed by a borehole is provided in a two-detector, pulsed neutron logging tool, by mea- suring ? at each detector and combining the two ? measurements in accordance with a previously estab- lished empirical relationship of the general form: ? =?F + A(?F + ?NB) + C, where ?F and ?N are the ? measurements at the far- spaced and near-spaced detectors, respectively, A is a correction coefficient for borehole capture cross section effects, B is a correction coefficient for neutron diffusion effects, and C is a constant re- lated to parameters of the logging tool. Preferred numerical values of A, B and C are disclosed, and a relationship for more accurately approximating the A term to specific borehole conditions.

411275

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