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Class Information
Number: 250/266
Name: Radiant energy > Geological testing or irradiation > Well testing apparatus and methods > Plural detectors > With spacing or direction of detectors
Description: Subject matter which may include the means to expose the material to radiation which includes at least a radiation source and wherein there are details concerning the location or spacing of the detectors with respect to the source or to one another or the direction the radiation is permitted to be incident upon the detectors and includes methods corresponding to the apparatus.
Patents under this class:
| Patent Number |
Title Of Patent |
Date Issued |
| 7432500 |
Azimuthal binning of density and porosity data |
Oct. 7, 2008 |
| 7328106 |
Method of correcting density logs for the presence of the casing |
Feb. 5, 2008 |
| 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 |
| 7294829 |
Method and apparatus for an improved formation density indicator using pulsed neutron instruments |
Nov. 13, 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 |
| 7206376 |
Fluid density measurement |
Apr. 17, 2007 |
| 7151254 |
Logging tool with response invariant to changes in borehole pressure |
Dec. 19, 2006 |
| 7129477 |
Method of processing data from a dual detector LWD density logging instrument coupled with an acoustic standoff measurement |
Oct. 31, 2006 |
| 6825459 |
Dual compensated chlorine logging tool |
Nov. 30, 2004 |
| 6815665 |
Apparatus and methods for determining gravel pack quality |
Nov. 9, 2004 |
| 6781115 |
Subsurface radiation phenomena detection with combined and azimuthally sensitive detectors |
Aug. 24, 2004 |
| 6747270 |
Method and apparatuses for logging hydrocarbon reservoirs |
Jun. 8, 2004 |
| 6732059 |
Ultra-low background gas-filled alpha counter |
May. 4, 2004 |
| 6700115 |
Standoff compensation for nuclear measurements |
Mar. 2, 2004 |
| 6696362 |
Method for using an in situ particle sensor for monitoring particle performance in plasma deposition processes |
Feb. 24, 2004 |
| 6552334 |
Wellbore caliper measurement method using measurements from a gamma-gamma density |
Apr. 22, 2003 |
| 6408110 |
Tiled imaging apparatus providing substantially continuous imaging |
Jun. 18, 2002 |
| 6215120 |
Method for determining symmetry and direction properties of azimuthal gamma ray distributions |
Apr. 10, 2001 |
| 5909772 |
Apparatus and method for estimating liquid yield of a gas/condensate reservoir |
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 |
| 5767510 |
Borehole invariant porosity measurement system |
Jun. 16, 1998 |
| 5705812 |
Compaction monitoring instrument system |
Jan. 6, 1998 |
| 5684299 |
Method for determining porosity in an invaded gas reservoir |
Nov. 4, 1997 |
| 5668369 |
Method and apparatus for lithology-independent well log analysis of formation water saturation |
Sep. 16, 1997 |
| 5665972 |
Method and apparatus for monitoring contamination |
Sep. 9, 1997 |
| 5635712 |
Method for monitoring the hydraulic fracturing of a subterranean formation |
Jun. 3, 1997 |
| 5627368 |
Four-detector formation-density tool for use in cased and open holes |
May. 6, 1997 |
| 5596191 |
Method and apparatus for epithermal neutron porosity measurement corrected for tool standoff and formation lithology |
Jan. 21, 1997 |
| 5591967 |
Method and apparatus for determining neutron detector operability using gamma ray sources |
Jan. 7, 1997 |
| 5532481 |
System for measuring epithermal neutron porosity having reduced borehole effect |
Jul. 2, 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 |
| 5528029 |
Logging method and apparatus using a pad to measure density |
Jun. 18, 1996 |
| 5525797 |
Formation density tool for use in cased and open holes |
Jun. 11, 1996 |
| 5521378 |
Method and apparatus for gamma ray logging of underground formations |
May. 28, 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 |
| 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 |
| 5451779 |
Formation density measurement apparatus and method |
Sep. 19, 1995 |
| 5390115 |
Compensated gamma-gamma density sonde using three detectors |
Feb. 14, 1995 |
| 5371363 |
Device for measuring radiation within a pipe |
Dec. 6, 1994 |
| 5357797 |
Method and apparatus for correcting MWD porosity measurement |
Oct. 25, 1994 |
| 5349184 |
Method and apparatus for reducing matrix density effects on porosity measurements during epithermal neutron porosity well logging |
Sep. 20, 1994 |
| 5321982 |
Method for measuring the rate of penetration of an equipment progressing in a well |
Jun. 21, 1994 |
| 5250806 |
Stand-off compensated formation measurements apparatus and method |
Oct. 5, 1993 |
| 5235185 |
Formation sigma measurement from thermal neutron detection |
Aug. 10, 1993 |
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