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Class Information
Number: 250/264
Name: Radiant energy > Geological testing or irradiation > Well testing apparatus and methods > With particular detector signal circuit > Having plural detectors
Description: Subject matter wherein there are plural detectors and the individual detectors may be connected to the same electrical circuit or to separate electrical circuits and includes methods corresponding to the apparatus.
Patents under this class:
| Patent Number |
Title Of Patent |
Date Issued |
| 7279677 |
Measuring wellbore diameter with an LWD instrument using compton and photoelectric effects |
Oct. 9, 2007 |
| 7159672 |
Mapping tool for tracking and/or guiding an underground boring tool |
Jan. 9, 2007 |
| 7129477 |
Method of processing data from a dual detector LWD density logging instrument coupled with an acoustic standoff measurement |
Oct. 31, 2006 |
| 7099503 |
Image reconstruction method and X-ray CT apparatus |
Aug. 29, 2006 |
| 7085405 |
Direct tomographic reconstruction |
Aug. 1, 2006 |
| 7080698 |
Mapping tool for tracking and/or guiding an underground boring tool |
Jul. 25, 2006 |
| 6920943 |
Mapping tool for tracking and/or guiding an underground boring tool |
Jul. 26, 2005 |
| 6918293 |
System and method having radiation intensity measurements with standoff correction |
Jul. 19, 2005 |
| 6732059 |
Ultra-low background gas-filled alpha counter |
May. 4, 2004 |
| 6696362 |
Method for using an in situ particle sensor for monitoring particle performance in plasma deposition processes |
Feb. 24, 2004 |
| 6457537 |
Mapping tool for tracking and/or guiding an underground boring tool |
Oct. 1, 2002 |
| 6364035 |
Establishing positions of locating field detectors and path mapping in underground boring tool applications |
Apr. 2, 2002 |
| 6250402 |
Establishing positions of locating field detectors and path mappings in underground boring tool applications |
Jun. 26, 2001 |
| 6124590 |
Method for determining thermal neutron capture cross-section of earth formations using measurements from multiple capture gamma ray detectors |
Sep. 26, 2000 |
| 5705812 |
Compaction monitoring instrument system |
Jan. 6, 1998 |
| 5591967 |
Method and apparatus for determining neutron detector operability using gamma ray sources |
Jan. 7, 1997 |
| 5536938 |
Pulsed neutron decay logging |
Jul. 16, 1996 |
| 5530243 |
Formation density well logging tool with detector array for compensation of wellbore roughness and tool tilt |
Jun. 25, 1996 |
| 5528030 |
System for determining gas saturation of a formation and a wellbore through casing |
Jun. 18, 1996 |
| 5525797 |
Formation density tool for use in cased and open holes |
Jun. 11, 1996 |
| 5473158 |
Logging while drilling method and apparatus for measuring formation characteristics as a function of angular position within a borehole |
Dec. 5, 1995 |
| 5461909 |
Oxygen activation method for quantitative water flow measurements within and behind well bore casing |
Oct. 31, 1995 |
| 5459314 |
Method for correcting density measurements that are affected by natural and neutron-induced gamma radiation |
Oct. 17, 1995 |
| 5408097 |
Method and apparatus for correcting natural gamma ray measurements for borehole fluid effects |
Apr. 18, 1995 |
| 5397893 |
Method for analyzing formation data from a formation evaluation measurement-while-drilling logging tool |
Mar. 14, 1995 |
| 5357797 |
Method and apparatus for correcting MWD porosity measurement |
Oct. 25, 1994 |
| 5350925 |
Methods for determining values for earth formation properties |
Sep. 27, 1994 |
| 5345077 |
Method and apparatus for producing a porosity log of a subsurface formation corrected for detector standoff |
Sep. 6, 1994 |
| 5272336 |
Temperature corrections of measurements made with scintillation detectors |
Dec. 21, 1993 |
| 5175429 |
Stand-off compensation for nuclear MWD measurement |
Dec. 29, 1992 |
| 5097123 |
Broad energy spectra neutron source for logging and method |
Mar. 17, 1992 |
| 5091644 |
Method for analyzing formation data from a formation evaluation MWD logging tool |
Feb. 25, 1992 |
| 5065016 |
Radioactive well logging to determine vertical brine flow |
Nov. 12, 1991 |
| 5055675 |
Pulse height analyzer for spectroscopy thermal multigate decay well logging system |
Oct. 8, 1991 |
| 5055676 |
Method for determining oil and water saturation in earth formation surrounding a borehole |
Oct. 8, 1991 |
| 5021653 |
Geochemical logging apparatus and method for determining concentrations of formation elements next to a borehole |
Jun. 4, 1991 |
| 5019708 |
Method for eliminating the effect of rugosity from compensated formation logs by geometrical response matching |
May. 28, 1991 |
| 4982086 |
Method of porosity determination in porous media by x-ray computed tomography |
Jan. 1, 1991 |
| 4947040 |
Thermal decay time logging method and tool |
Aug. 7, 1990 |
| 4926044 |
Thermal decay time logging method and apparatus |
May. 15, 1990 |
| 4910397 |
Pulsed neutron porosity logging |
Mar. 20, 1990 |
| 4894534 |
Logging apparatus and method |
Jan. 16, 1990 |
| 4829176 |
Logging apparatus and method |
May. 9, 1989 |
| 4786796 |
Method for determining formation characteristics with enhanced vertical resolution |
Nov. 22, 1988 |
| 4705944 |
Formation density logging while drilling |
Nov. 10, 1987 |
| 4698501 |
System for simultaneous gamma-gamma formation density logging while drilling |
Oct. 6, 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 |
| 4645927 |
Clay type and volume evaluation |
Feb. 24, 1987 |
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