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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 |
| 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 |
| 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 |
| 5361632 |
Method and apparatus for determining multiphase holdup fractions using a gradiomanometer and a densitometer |
Nov. 8, 1994 |
| 5359195 |
Gas hold up tool for use in cased well boreholes |
Oct. 25, 1994 |
| 5350925 |
Methods for determining values for earth formation properties |
Sep. 27, 1994 |
| 5250806 |
Stand-off compensated formation measurements apparatus and method |
Oct. 5, 1993 |
| 5205167 |
Method and apparatus for locating stratification in production fluid in a well |
Apr. 27, 1993 |
| 5204529 |
Method and apparatus for measuring borehole fluid density, formation density and/or borehole diameter using back-scattered gamma radiation |
Apr. 20, 1993 |
| 5196698 |
Method and apparatus for nuclear logging using lithium detector assemblies |
Mar. 23, 1993 |
| 5144126 |
Apparatus for nuclear logging employing sub wall mounted detectors and electronics, and modular connector assemblies |
Sep. 1, 1992 |
| 5134285 |
Formation density logging MWD apparatus |
Jul. 28, 1992 |
| 5126564 |
Apparatus for nuclear logging employing sub wall mounted nuclear source container and nuclear source mounting tool |
Jun. 30, 1992 |
| 5122662 |
Circular induction accelerator for borehole logging |
Jun. 16, 1992 |
| 5091644 |
Method for analyzing formation data from a formation evaluation MWD logging tool |
Feb. 25, 1992 |
| 5023449 |
Nuclear spectroscopy signal stabilization and calibration method and apparatus |
Jun. 11, 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 |
| 4958073 |
Apparatus for fine spatial resolution measurments of earth formations |
Sep. 18, 1990 |
| 4939362 |
Borehole fluid density well logging means and method |
Jul. 3, 1990 |
| 4894534 |
Logging apparatus and method |
Jan. 16, 1990 |
| 4864129 |
Logging apparatus and method |
Sep. 5, 1989 |
| 4857728 |
Method and apparatus for reducing radioactive hazards in well boreholes |
Aug. 15, 1989 |
| 4820919 |
Method of determining the density of substrata |
Apr. 11, 1989 |
| 4814611 |
Apparatus for measuring borehole-compensated densities and lithology-dependent factors using one or more detectors |
Mar. 21, 1989 |
| 4814609 |
Methods and apparatus for safely measuring downhole conditions and formation characteristics while drilling a borehole |
Mar. 21, 1989 |
| 4712006 |
Steam quality measurement apparatus and method |
Dec. 8, 1987 |
| 4705944 |
Formation density logging while drilling |
Nov. 10, 1987 |
| 4661700 |
Well logging sonde with shielded collimated window |
Apr. 28, 1987 |
| 4628202 |
Method and apparatus for gamma ray well logging |
Dec. 9, 1986 |
| 4618765 |
Gamma ray measurement of earth formation properties using a position sensitive scintillation detector |
Oct. 21, 1986 |
| 4587423 |
Method for gravel pack evaluation |
May. 6, 1986 |
| 4578580 |
Gamma spectrum porosity measurement |
Mar. 25, 1986 |
| 4558220 |
Radioactivity well logging |
Dec. 10, 1985 |
| 4524273 |
Method and apparatus for gamma ray well logging |
Jun. 18, 1985 |
| 4442701 |
Method for measuring density of a bulk material in a stockpile |
Apr. 17, 1984 |
| 4403146 |
Evaluation of the interaction with radiant energy of substances traversed by a bore hole |
Sep. 6, 1983 |
| RE31122 |
Method for ascertaining optimum location for well stimulation and/or perforation |
Jan. 11, 1983 |
| 4342911 |
Focused nuclear interface survey instrument and method of determining density changes in mining and storage wells |
Aug. 3, 1982 |
| 4297575 |
Simultaneous gamma ray measurement of formation bulk density and casing thickness |
Oct. 27, 1981 |
| 4180727 |
Gamma-gamma density logging method |
Dec. 25, 1979 |
| 4048495 |
Doubly-compensated dual-detector density logging apparatus |
Sep. 13, 1977 |
| 4034218 |
Focused detection logging technique |
Jul. 5, 1977 |
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