Radiant energy – Geological testing or irradiation – Well testing apparatus and methods
Patent
1987-01-07
1988-01-26
Howell, Janice A.
Radiant energy
Geological testing or irradiation
Well testing apparatus and methods
250270, G01V 500
Patent
active
047218533
ABSTRACT:
A novel neutron burst timing, detection, and calculation method and apparatus are disclosed for a Thermal Decay Time Logging System. A neutron bursting regime is provided which includes a short burst, long burst repetitive sequence. After a short delay from the short burst, a first series of time gates is provided for accumulating gamma ray counts. After a relatively longer delay from the long burst, a second series of time gates is provided for accumulating gamma ray counts. The thermal neutron decay time constant .tau. and the macroscopic capture cross-section .SIGMA. of the formation are determined through an iterative procedure by which the formation .tau. is estimated from the second series of time gates which have been stripped of borehole decay counts determined from the first series of time gates. Similarly, the borehole .tau. is estimated from the first series of time gates which have been stripped of formation decay counts determined from the second series of time gates.
REFERENCES:
patent: 3164720 (1965-01-01), Armistead
patent: 3379882 (1963-04-01), Youmans
patent: 3662179 (1972-05-01), Frentrop et al.
patent: 3973131 (1976-08-01), Malone et al.
patent: 4122338 (1978-10-01), Smith et al.
patent: 4223218 (1980-09-01), Jacobson
patent: 4224516 (1980-09-01), Johnstone
patent: 4267447 (1981-05-01), Johnstone
patent: 4292518 (1981-09-01), Johnstone
patent: 4326129 (1982-04-01), Neufeld
patent: 4424444 (1984-01-01), Smith, Jr. et al.
patent: 4625111 (1986-11-01), Smith, Jr.
Garrana Henry N.
Howell Janice A.
Schlumberger Technology Corporation
LandOfFree
Thermal decay time logging method and apparatus does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Thermal decay time logging method and apparatus, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Thermal decay time logging method and apparatus will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-1469247