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Class Information
Number: 250/269.3
Name: Radiant energy > Geological testing or irradiation > Well testing apparatus and methods > With source and detector > Having gamma source and gamma detector
Description: Subject matter wherein the means to expose the material to radiation includes a gamma ray source and the means to detect radiation modified or caused by the material includes a gamma ray detector and includes methods corresponding to the apparatus.
Patents under this class:
| Patent Number |
Title Of Patent |
Date Issued |
| 7334465 |
Integrated logging tool for borehole |
Feb. 26, 2008 |
| 7313221 |
Radiographic equipment |
Dec. 25, 2007 |
| 7309857 |
Gamma ray detectors having improved signal-to-noise ratio and related systems and methods for analyzing materials in an oil well |
Dec. 18, 2007 |
| 7285772 |
Logging tool with a parasitic radiation shield and method of logging with such a tool |
Oct. 23, 2007 |
| 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 |
| 7253401 |
Spectral gamma ray logging-while-drilling system |
Aug. 7, 2007 |
| 7250606 |
Buried object evaluating method, underground resources evaluating method, underground waste evaluating method, underground preserved object evaluating method, stratum structure evaluating meth |
Jul. 31, 2007 |
| 7217917 |
Natural gamma ray logging sub method and apparatus |
May. 15, 2007 |
| 7206376 |
Fluid density measurement |
Apr. 17, 2007 |
| 7200200 |
X-ray fluorescence measuring system and methods for trace elements |
Apr. 3, 2007 |
| 7151254 |
Logging tool with response invariant to changes in borehole pressure |
Dec. 19, 2006 |
| 6997257 |
Apparatus and method for determining the dip of an underground formation in a cased or uncased borehole |
Feb. 14, 2006 |
| 6907944 |
Apparatus and method for minimizing wear and wear related measurement error in a logging-while-drilling tool |
Jun. 21, 2005 |
| 6903330 |
Multi-point subsurface measurement calibration |
Jun. 7, 2005 |
| 6876721 |
Method for depth-matching using computerized tomography |
Apr. 5, 2005 |
| 6815665 |
Apparatus and methods for determining gravel pack quality |
Nov. 9, 2004 |
| 6766855 |
Apparatus and method for determining the dip of an underground formation in a cased or uncased borehole |
Jul. 27, 2004 |
| 6768106 |
Method of kick detection and cuttings bed buildup detection using a drilling tool |
Jul. 27, 2004 |
| 6704385 |
Method for simulating the response of a detector of radiation emitted by radioactive objects and method for controlling nuclear fuel elements using said simulation |
Mar. 9, 2004 |
| 6700115 |
Standoff compensation for nuclear measurements |
Mar. 2, 2004 |
| 6696684 |
Formation evaluation through azimuthal tool-path identification |
Feb. 24, 2004 |
| 6666285 |
Logging-while-drilling apparatus and methods for measuring density |
Dec. 23, 2003 |
| 6619395 |
Methods for determining characteristics of earth formations |
Sep. 16, 2003 |
| 6590202 |
Standoff compensation for nuclear measurements |
Jul. 8, 2003 |
| 6566649 |
Standoff compensation for nuclear measurements |
May. 20, 2003 |
| 6552334 |
Wellbore caliper measurement method using measurements from a gamma-gamma density |
Apr. 22, 2003 |
| 6552333 |
Apparatus and methods for determining gravel pack quality |
Apr. 22, 2003 |
| 6492641 |
Apparatus and method for gamma-ray determination of bulk density of samples |
Dec. 10, 2002 |
| 6472660 |
Imaging sensor |
Oct. 29, 2002 |
| 6332351 |
Detection of salt content of water through measurement of radiation attenuation |
Dec. 25, 2001 |
| 6307199 |
Compensation of errors in logging-while-drilling density measurements |
Oct. 23, 2001 |
| 6265713 |
Measurement flow section for oil well effluents and system including such a section |
Jul. 24, 2001 |
| 6064068 |
System and method for monitoring the stability of a scintillation detector |
May. 16, 2000 |
| 6028307 |
Data acquisition and reduction method for multi-component flow |
Feb. 22, 2000 |
| 5912460 |
Method for determining formation density and formation photo-electric factor with a multi-detector-gamma-ray tool |
Jun. 15, 1999 |
| 5910654 |
Apparatus and method for measuring formation density in rugose boreholes |
Jun. 8, 1999 |
| 5847384 |
Method for determining irregularities in a wellbore wall using a gamma-gamma well logging instrument |
Dec. 8, 1998 |
| 5841135 |
Method and apparatus for measuring formation density and the formation photo-electric factor with a multi-detector gamma-gamma tool |
Nov. 24, 1998 |
| 5684299 |
Method for determining porosity in an invaded gas reservoir |
Nov. 4, 1997 |
| 5672867 |
Method for filtering gamma ray well logging tool response to enhance vertical detail while suppressing statistical noise |
Sep. 30, 1997 |
| 5659169 |
Formation density sensor having detector array and method of calculating bulk density and correction |
Aug. 19, 1997 |
| 5627368 |
Four-detector formation-density tool for use in cased and open holes |
May. 6, 1997 |
| 5608214 |
Gamma ray spectral tool for well logging |
Mar. 4, 1997 |
| 5552598 |
Determination of downhole flow regime in a horizontal wellbore by using center sample and fullbore gas-liquid holdup measurements |
Sep. 3, 1996 |
| 5530243 |
Formation density well logging tool with detector array for compensation of wellbore roughness and tool tilt |
Jun. 25, 1996 |
| 5525797 |
Formation density tool for use in cased and open holes |
Jun. 11, 1996 |
| 5506769 |
Method for enhancing vertical resolution of nuclear well logging instruments |
Apr. 9, 1996 |
| 5483061 |
Gamma ray scintillation detector apparatus and method for reducing shock induced noise |
Jan. 9, 1996 |
| 5473158 |
Logging while drilling method and apparatus for measuring formation characteristics as a function of angular position within a borehole |
Dec. 5, 1995 |
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