Radiant energy – Geological testing or irradiation – Well testing apparatus and methods
Patent
1997-06-19
1999-05-04
Hannaher, Constantine
Radiant energy
Geological testing or irradiation
Well testing apparatus and methods
2502696, G01V 512
Patent
active
059006277
ABSTRACT:
A device for measuring the density of a formation uses a high-energy pulsed neutron source which induces gamma rays in the formation, and determines a gamma diffusion length of the formation based on the attenuation of gamma rays produced by inelastic scattering of fast neutrons. The borehole tool houses the neutron source along with a near gamma ray detector and a far gamma ray detector. The gamma ray detectors are located at different distances from the fast neutron source and spaced sufficiently from the fast neutron source such that dependence of inelastic gamma counts on fast neutron transport and gamma production of the formation is substantially reduced. Gamma ray events can be sorted and counted in time- and energy-dependent bins. The present invention has several advantages over gamma-gamma logging, including deeper penetration of gamma, and is also superior over systems which measure, e.g., hydrogen-based porosity.
REFERENCES:
patent: 3946226 (1976-03-01), Smith, Jr.
patent: 4055763 (1977-10-01), Antkiw
patent: 4122339 (1978-10-01), Smith, Jr. et al.
patent: 4122340 (1978-10-01), Smith, Jr. et al.
patent: 4239965 (1980-12-01), Oliver et al.
patent: 4297575 (1981-10-01), Smith, Jr. et al.
patent: 4430567 (1984-02-01), Oliver et al.
patent: 4605854 (1986-08-01), Smith, Jr.
patent: 4645926 (1987-02-01), Randall
patent: 4656354 (1987-04-01), Randall
patent: 5374823 (1994-12-01), Odom
patent: 5525797 (1996-06-01), Moake
patent: 5608215 (1997-03-01), Evans
Anonymous, Log Interpretation Charts, p. 101, Dresser Atlas, Dresser Industries, Inc., USA, Jun. 1983.
J. Tittman and J. S. Wahl, "The Physical Foundations of Formation Density Logging (Gamma-Gamma), " pp. 284-293, Geophysics, vol. XXX, No. 2, Apr. 1965.
Cased Hole Exploration: Modern Pulsed Neutron Techniques for Locating By-Passed Hydrocarbons in Old Wells, by R.W. Streeter et al. from Mar. 1996, SPE Permian Basin Oil & Gas Recovery Conference.
A New 1.625" Diameter Pulsed Neutron Capture and Inelastic/Capture Spectral Combination System Provides Answers in Complex Reservoirs, by R.C. Odom et al. from Jun. 1994 SPWLA Annual Logging Symposium.
Program and pertinent slides from a presentation by Richard Odom at SIAM Symposium on Inverse Problems: Geophysical Applications, Dec. 17, 1995.
PDK-100 Log Examples in the Gulf Coast, by R.R. Randall et al. for the Jun. 1985 SPWLA Annual Logging Symposium.
The PDK-100 Enhances Interpretation Capabilities for Pulsed neutron Capture Logs, by R.R. Randall et al. from the Jun. 1986 SPWLA Annual Logging Symposium.
Using Pulsed Neutron Decay-Spectrum Data and Multi-inflatable Packer Plugdown Assemblies Improve Oil Production Rates in a Mature CO.sub.2 Flood, by B.D. Schneider from Mar. 1996 SPE Permian Basin Oil & Gas Recovery Conference.
"Bulk Density Logging with High-Energy Gammas Produced by Fast Neutron Reactions with Formation Oxygen Atoms" by Robert D. Wilson, 1995 IEEE Nuclear Science Symposium and Medical Imaging Conference Record, vol. 1, Oct. 21-28, 1995, San Francisco.
Odom Richard C.
Streeter Richard W.
Wilson Robert D.
Computalog Research, Inc.
Dillon Andrew J.
Hannaher Constantine
Musgrove Jack V.
LandOfFree
Formation density measurement utilizing pulse neutrons does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Formation density measurement utilizing pulse neutrons, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Formation density measurement utilizing pulse neutrons will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-1870981