Radiant energy – Geological testing or irradiation – Well testing apparatus and methods
Patent
1992-08-10
1994-04-05
Dzierzynski, Paul M.
Radiant energy
Geological testing or irradiation
Well testing apparatus and methods
250256, 250262, 250268, 250270, 364422, 395 11, 395 22, 395928, 395929, G01V 510, G01N 23204
Patent
active
053007700
ABSTRACT:
A borehole logging tool is lowered into a borehole traversing a subsurface formation and a neutron detector measures the die-away of nuclear radiation in the formation. Intensity signals are produced representing the die-away of nuclear radiation as the logging tool traverses the borehole A signal processor, employing at least one neural network, processes the intensity signals and produces a standoff-corrected epithermal neutron lifetime signal to correct for standoff from the borehole wall encountered by the detector as the logging tool traverses the borehole. The signal processor further generates a porosity signal from the standoff-corrected epithermal neutron lifetime signal derived from measurements in borehole models at known porosities and conditions of detector standoff. A log is generated of such porosity signal versus depth as the logging tool traverses the borehole.
REFERENCES:
patent: 4097737 (1978-06-01), Wills, Jr.
patent: 4556793 (1985-12-01), Allen et al.
patent: 4581532 (1986-04-01), Givens et al.
patent: 4590370 (1986-05-01), Mills, Jr. et al.
patent: 4600858 (1986-07-01), Steinman et al.
patent: 4625110 (1986-11-01), Smith, Jr.
patent: 4638161 (1987-01-01), Smith, Jr. et al.
patent: 4692617 (1987-09-01), Allen et al.
patent: 4964087 (1990-10-01), Widrow
patent: 4972082 (1990-11-01), Loomis et al.
patent: 5068531 (1991-11-01), Allen et al.
patent: 5189415 (1993-02-01), Shimada et al.
"An Artificial Neural Network Approach to Identify the Well Test Interpretation Model:Applications" SPE 56th An. Tech. Conf. Sep. 93, Al-Kaabi et al.
"Improved Methods of Signal Processing For Pulsed Neutron Capture Logging" SPWLA 22nd Annual Logging Symposium, Jun. 23-26, 1981, Randall et al.
Allen L. Scott
Mills William R.
Bruce David V.
Dzierzynski Paul M.
Hager Jr. George W.
McKillop Alexander J.
Mobil Oil Corporation
LandOfFree
Apparatus for producing a porosity log of a subsurface formation does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Apparatus for producing a porosity log of a subsurface formation, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Apparatus for producing a porosity log of a subsurface formation will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-513394