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Class Information
Number: 250/269.8
Name: Radiant energy > Geological testing or irradiation > Well testing apparatus and methods > With source and detector > Having neutron source and gamma detector > With detection in plural consecutive time intervals
Description: Subject matter wherein the detection method includes detecting gamma rays in two or more time intervals which occur after the beginning of a neutron pulse or burst from the neutron radiation source, but before the beginning of a subsequent neutron pulse or burst.
Patents under this class:
| Patent Number |
Title Of Patent |
Date Issued |
| 7439494 |
Method and apparatus for determining the thermal neutron capture cross-section of a subsurface formation from a borehole |
Oct. 21, 2008 |
| 7408150 |
Well logging method for determining formation characteristics using pulsed neutron capture measurements |
Aug. 5, 2008 |
| 7342222 |
Method and apparatus for downhole spectroscopy processing |
Mar. 11, 2008 |
| 7282704 |
Method for determining formation porosity and gas saturation in a gas reservoir |
Oct. 16, 2007 |
| 6901337 |
Method and apparatus for measuring signal pulse energy |
May. 31, 2005 |
| 6665616 |
Method for determining decay characteristics of multi-component downhole decay data |
Dec. 16, 2003 |
| 6566649 |
Standoff compensation for nuclear measurements |
May. 20, 2003 |
| 6207953 |
Apparatus and methods for determining gas saturation and porosity of a formation penetrated by a gas filled or liquid filled borehole |
Mar. 27, 2001 |
| 5973321 |
Method for determining multiple thermal neutron decay components from the capture gamma ray spectrum measured by a pulsed neutron instrument |
Oct. 26, 1999 |
| 5949069 |
Method and apparatus for measuring volumetric water flow rates in highly inclined wellbores |
Sep. 7, 1999 |
| 5532481 |
System for measuring epithermal neutron porosity having reduced borehole effect |
Jul. 2, 1996 |
| 5473158 |
Logging while drilling method and apparatus for measuring formation characteristics as a function of angular position within a borehole |
Dec. 5, 1995 |
| 5451779 |
Formation density measurement apparatus and method |
Sep. 19, 1995 |
| 5440118 |
Methods and apparatus for determining formation lithology by gamma ray spectroscopy |
Aug. 8, 1995 |
| 5434408 |
Induced gamma ray spectroscopy well logging system |
Jul. 18, 1995 |
| 5406078 |
Induced gamma ray spectorscopy well logging system |
Apr. 11, 1995 |
| 5081351 |
Method and apparatus for borehole correction in capture gamma ray spectroscopy measurements |
Jan. 14, 1992 |
| 4788424 |
Method and apparatus for determining partitioning of borehole and formation constituents |
Nov. 29, 1988 |
| 4749859 |
Nuclear well logging data acquistion system and method |
Jun. 7, 1988 |
| 4746801 |
Method and apparatus for differentiating low porosity limestones from high porosity gas sands |
May. 24, 1988 |
| 4721853 |
Thermal decay time logging method and apparatus |
Jan. 26, 1988 |
| 4712007 |
Pulsed neutron logging method using cumulative count curves |
Dec. 8, 1987 |
| 4697078 |
Method for quality control of counting logs |
Sep. 29, 1987 |
| 4668863 |
Neutron logging time spectral data acquisition system and method |
May. 26, 1987 |
| 4656354 |
Method for induced gamma ray logging |
Apr. 7, 1987 |
| 4645926 |
Method for induced gamma ray logging |
Feb. 24, 1987 |
| 4625111 |
Method and apparatus for pulsed neutron capture measurement of borehole conditions and formation hydrogen index |
Nov. 25, 1986 |
| 4600838 |
Methods and apparatus for measuring thermal neutron decay characteristics of earth formations |
Jul. 15, 1986 |
| 4596927 |
Method and apparatus for induced gamma ray logging |
Jun. 24, 1986 |
| 4507554 |
Method and apparatus for determining borehole and formation constituents |
Mar. 26, 1985 |
| 4501964 |
Borehole compensated oxygen activation nuclear well logging |
Feb. 26, 1985 |
| 4454420 |
Neutron-inelastic gamma radiation well logging method and apparatus with background radiation accounted for |
Jun. 12, 1984 |
| 4446369 |
Method and system for radioactive assaying |
May. 1, 1984 |
| 4424444 |
Method for simultaneous measurement of borehole and formation neutron lifetimes |
Jan. 3, 1984 |
| 4409481 |
Method for simultaneous measurement of thermal neutron decay components |
Oct. 11, 1983 |
| 4390783 |
Spectroscopic analysis with background compensation |
Jun. 28, 1983 |
| 4388529 |
System for simultaneous measurement of borehole and formation neutron lifetimes |
Jun. 14, 1983 |
| 4385235 |
Method and apparatus for measuring the thermal neutron absorption rate in earth formations |
May. 24, 1983 |
| 4381449 |
Neutron-inelastic gamma radiation well logging method and apparatus with background radiation accounted for |
Apr. 26, 1983 |
| 4350888 |
Method and system for determining thermal neutron lifetime of earth formations |
Sep. 21, 1982 |
| 4327290 |
Method and apparatus for nuclear well logging with optimized timing for simultaneous measurement of thermal neutron decay time and gamma ray pulse height spectra |
Apr. 27, 1982 |
| 4317993 |
Methods and apparatus for constituent analysis of earth formations |
Mar. 2, 1982 |
| 4317034 |
Method and apparatus for measuring neutron characteristics of material surrounding a borehole |
Feb. 23, 1982 |
| 4315148 |
Method and apparatus for measuring neutron characteristics of material surrounding a borehole |
Feb. 9, 1982 |
| 4232220 |
Background subtraction system for pulsed neutron logging of earth boreholes |
Nov. 4, 1980 |
| 4191884 |
Determination of water saturation in subsurface earth formations adjacent well boreholes |
Mar. 4, 1980 |
| 4168428 |
Sync transmission method and apparatus for high frequency pulsed neutron spectral analysis systems |
Sep. 18, 1979 |
| 4151413 |
Method of measuring horizontal fluid flow behind casing in subsurface formations with sequential logging for interfering isotope compensation and increased measurement accuracy |
Apr. 24, 1979 |
| 4137450 |
Dual detector pulsed neutron logging for providing indication of formation porosity |
Jan. 30, 1979 |
| 4137452 |
Method of measuring horizontal fluid flow in cased off subsurface formations with manganese compensation |
Jan. 30, 1979 |
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