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Class Information
Number: 250/262
Name: Radiant energy > Geological testing or irradiation > Well testing apparatus and methods > With particular detector signal circuit
Description: Subject matter wherein the means to detect radiation emitted naturally or radiation modified or caused by material interacting with radiation includes a radiation detector and a detailed electrical circuit connected between the detector and an indicator or recorder of the radiation sensed by the detector and includes methods corresponding to the apparatus.
Sub-classes under this class:
Patents under this class:
| Patent Number |
Title Of Patent |
Date Issued |
| 4788424 |
Method and apparatus for determining partitioning of borehole and formation constituents |
Nov. 29, 1988 |
| 4786796 |
Method for determining formation characteristics with enhanced vertical resolution |
Nov. 22, 1988 |
| 4746801 |
Method and apparatus for differentiating low porosity limestones from high porosity gas sands |
May. 24, 1988 |
| 4722095 |
Method for identifying porosity and drilling mud invasion of a core sample from a subterranean formation |
Jan. 26, 1988 |
| 4717825 |
Method and apparatus for anomalous radioactive deposition compensation in spectral gamma ray well logging |
Jan. 5, 1988 |
| 4712007 |
Pulsed neutron logging method using cumulative count curves |
Dec. 8, 1987 |
| 4705944 |
Formation density logging while drilling |
Nov. 10, 1987 |
| 4698499 |
Quantitative evaluation of uranium ore zones |
Oct. 6, 1987 |
| 4668863 |
Neutron logging time spectral data acquisition system and method |
May. 26, 1987 |
| 4661701 |
Methods and apparatus for borehole-corrected spectral analysis of earth formations |
Apr. 28, 1987 |
| 4656354 |
Method for induced gamma ray logging |
Apr. 7, 1987 |
| 4645926 |
Method for induced gamma ray logging |
Feb. 24, 1987 |
| 4638161 |
Epithermal neutron porosity measurement |
Jan. 20, 1987 |
| 4634863 |
Nuclear detector system with reduced dead-time processor circuit |
Jan. 6, 1987 |
| 4628202 |
Method and apparatus for gamma ray well logging |
Dec. 9, 1986 |
| 4625110 |
Epithermal neutron porosity measurement |
Nov. 25, 1986 |
| 4612439 |
Method and apparatus for natural gamma ray well logging |
Sep. 16, 1986 |
| 4600838 |
Methods and apparatus for measuring thermal neutron decay characteristics of earth formations |
Jul. 15, 1986 |
| 4596927 |
Method and apparatus for induced gamma ray logging |
Jun. 24, 1986 |
| 4587423 |
Method for gravel pack evaluation |
May. 6, 1986 |
| 4587424 |
Method for investigating the composition of an earth formation traversed by a borehole |
May. 6, 1986 |
| 4542292 |
Correction of natural gamma radiation logs for the effects of gamma ray emission from and attenuation by the borehole fluid |
Sep. 17, 1985 |
| 4540883 |
Background correction method and apparatus for pulsed neutron logging of earth boreholes |
Sep. 10, 1985 |
| 4527058 |
Earth formation density measurement from natural gamma ray spectral logs |
Jul. 2, 1985 |
| 4524274 |
Methods and apparatus for investigating an earth formation and compensating for borehole environmental effects |
Jun. 18, 1985 |
| 4503328 |
Evaluation of the interaction with radiant energy of substances traversed by a borehole |
Mar. 5, 1985 |
| 4492863 |
Determining elemental concentrations and formation matrix type from natural gamma ray spectral logs |
Jan. 8, 1985 |
| 4481597 |
Borehole spectral analog to digital converter |
Nov. 6, 1984 |
| 4471435 |
Computer-based system for acquisition of nuclear well log data |
Sep. 11, 1984 |
| 4446369 |
Method and system for radioactive assaying |
May. 1, 1984 |
| 4446368 |
Method and apparatus for neutron induced gamma ray well logging |
May. 1, 1984 |
| 4439676 |
Natural gamma ray logging with borehole effect compensation |
Mar. 27, 1984 |
| 4436996 |
Borehole compensated KUT log |
Mar. 13, 1984 |
| 4433240 |
Method and apparatus for measuring gamma rays in a borehole |
Feb. 21, 1984 |
| 4430567 |
Method and apparatus for neutron induced gamma ray logging for direct porosity identification |
Feb. 7, 1984 |
| 4424444 |
Method for simultaneous measurement of borehole and formation neutron lifetimes |
Jan. 3, 1984 |
| 4409481 |
Method for simultaneous measurement of thermal neutron decay components |
Oct. 11, 1983 |
| 4403146 |
Evaluation of the interaction with radiant energy of substances traversed by a bore hole |
Sep. 6, 1983 |
| 4394574 |
Methods and apparatus for constituent analysis of earth formations |
Jul. 19, 1983 |
| 4388529 |
System for simultaneous measurement of borehole and formation neutron lifetimes |
Jun. 14, 1983 |
| 4385235 |
Method and apparatus for measuring the thermal neutron absorption rate in earth formations |
May. 24, 1983 |
| 4363137 |
Wireless telemetry with magnetic induction field |
Dec. 7, 1982 |
| 4348671 |
Dual spectra well logging system |
Sep. 7, 1982 |
| 4327290 |
Method and apparatus for nuclear well logging with optimized timing for simultaneous measurement of thermal neutron decay time and gamma ray pulse height spectra |
Apr. 27, 1982 |
| 4326129 |
Evaluation of the interaction with radiant energy of substances traversed by a bore hole |
Apr. 20, 1982 |
| 4317034 |
Method and apparatus for measuring neutron characteristics of material surrounding a borehole |
Feb. 23, 1982 |
| 4316086 |
Method and apparatus for measuring neutron characteristics of material surrounding a borehole |
Feb. 16, 1982 |
| 4315148 |
Method and apparatus for measuring neutron characteristics of material surrounding a borehole |
Feb. 9, 1982 |
| 4300043 |
Stabilized radioactive logging method and apparatus |
Nov. 10, 1981 |
| 4296321 |
Bit pressure gauge for well drilling |
Oct. 20, 1981 |
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