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Class Information
Number: 250/265
Name: Radiant energy > Geological testing or irradiation > Well testing apparatus and methods > Plural detectors
Description: Subject matter wherein the means to detect radiation emitted naturally or radiation modified or caused by material interacting with radiation includes plural radiation detectors and methods corresponding to the apparatus.
Sub-classes under this class:
Patents under this class:
| Patent Number |
Title Of Patent |
Date Issued |
| 7379592 |
System and method for significant dust detection and enhancement of dust images over land and ocean |
May. 27, 2008 |
| 7282704 |
Method for determining formation porosity and gas saturation in a gas reservoir |
Oct. 16, 2007 |
| 7279677 |
Measuring wellbore diameter with an LWD instrument using compton and photoelectric effects |
Oct. 9, 2007 |
| 7242803 |
System and method for significant dust detection and enhancement of dust images over land and ocean |
Jul. 10, 2007 |
| 6891194 |
Active matrix substrate, electromagnetic detector, and liquid crystal display apparatus |
May. 10, 2005 |
| 6825459 |
Dual compensated chlorine logging tool |
Nov. 30, 2004 |
| 6700115 |
Standoff compensation for nuclear measurements |
Mar. 2, 2004 |
| 6552333 |
Apparatus and methods for determining gravel pack quality |
Apr. 22, 2003 |
| 6476384 |
Methods and apparatus for downhole fluids analysis |
Nov. 5, 2002 |
| 6403740 |
Vinyl fluoride interpolymers |
Jun. 11, 2002 |
| 6285026 |
Borehole caliper derived from neutron porosity measurements |
Sep. 4, 2001 |
| 5939717 |
Methods and apparatus for determining gas-oil ratio in a geological formation through the use of spectroscopy |
Aug. 17, 1999 |
| 5659169 |
Formation density sensor having detector array and method of calculating bulk density and correction |
Aug. 19, 1997 |
| 5528029 |
Logging method and apparatus using a pad to measure density |
Jun. 18, 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 |
| 5508514 |
Well logging device with a pad |
Apr. 16, 1996 |
| 5481105 |
Neutron backscatter gravel pack logging sonde with azimuthal scan capability |
Jan. 2, 1996 |
| 5471057 |
Method and apparatus for determining elemental concentrations for .gamma. r a |
Nov. 28, 1995 |
| 5408097 |
Method and apparatus for correcting natural gamma ray measurements for borehole fluid effects |
Apr. 18, 1995 |
| 5250806 |
Stand-off compensated formation measurements apparatus and method |
Oct. 5, 1993 |
| 5184692 |
Retrievable radiation source carrier |
Feb. 9, 1993 |
| 5097123 |
Broad energy spectra neutron source for logging and method |
Mar. 17, 1992 |
| 5081351 |
Method and apparatus for borehole correction in capture gamma ray spectroscopy measurements |
Jan. 14, 1992 |
| 5068532 |
Analysis using neutrons |
Nov. 26, 1991 |
| 5055676 |
Method for determining oil and water saturation in earth formation surrounding a borehole |
Oct. 8, 1991 |
| 5053620 |
Logging apparatus and method for determining concentrations of subsurface formation elements |
Oct. 1, 1991 |
| 5045693 |
Carbon/oxygen well logging method and apparatus |
Sep. 3, 1991 |
| 5023450 |
Method for discriminating microphonic noise in proportional counters |
Jun. 11, 1991 |
| 5023449 |
Nuclear spectroscopy signal stabilization and calibration method and apparatus |
Jun. 11, 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 |
| 5012091 |
Production logging tool for measuring fluid densities |
Apr. 30, 1991 |
| 4952801 |
Logging tool for measuring the macroscopic thermal neutron capture cross section of borehole fluids |
Aug. 28, 1990 |
| 4937446 |
Carbon/oxygen well logging method and apparatus |
Jun. 26, 1990 |
| 4931638 |
Method of monitoring hidden coal-rock interface and transducer realizing this method |
Jun. 5, 1990 |
| 4926044 |
Thermal decay time logging method and apparatus |
May. 15, 1990 |
| 4808838 |
Collimated thermal neutron porosity tool |
Feb. 28, 1989 |
| 4791797 |
Density neutron self-consistent caliper |
Dec. 20, 1988 |
| 4698501 |
System for simultaneous gamma-gamma formation density logging while drilling |
Oct. 6, 1987 |
| 4698500 |
Method and apparatus for determining clay counter-ion concentration in shaly sands |
Oct. 6, 1987 |
| 4691102 |
Borehole compensation method and apparatus using variations in relative borehole components |
Sep. 1, 1987 |
| 4686364 |
In situ determination of total carbon and evaluation of source rock therefrom |
Aug. 11, 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 |
| 4596926 |
Formation density logging using multiple detectors and sources |
Jun. 24, 1986 |
| 4559605 |
Method and apparatus for random array beamforming |
Dec. 17, 1985 |
| 4524272 |
Behind casing water flow detector |
Jun. 18, 1985 |
| 4492865 |
Borehole influx detector and method |
Jan. 8, 1985 |
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