173367 ⎘
Prospecting or detecting by the use of nuclear radiation, e.g. of natural or induced radioactivity specially adapted for well-logging using primary nuclear radiation sources or X-rays using neutron sources and detecting secondary Y-rays as well as reflected or back-scattered neutrons
Sub-classes:METHOD AND APPARATUS FOR OBTAINING FORMATION DENSITY
#2Method and apparatus for using pulsed neutron generators and dual-function detectors to obtain formation mineralogy
#3Methods and Means for Simultaneous Casing Integrity Evaluation and Cement Inspection in a Multiple-Casing Wellbore Environment
#4Systems and methods for determining the presence of cement behind at least one casing using spectroscopy measurement
#5Methods and Means for Simultaneous Casing Integrity Evaluation and Cement Inspection in a Multiple-Casing Wellbore Environment
#6Method of and apparatus for determining component weight and/or volume fractions of subterranean rock
#7Method for using neutron interaction cross section to interpret neutron measurements
#8Compensated spectroscopy measurements
#9Systems and methods for determining the presence of cement behind at least one casing using spectroscopy measurement
#10METHOD FOR PRODUCING A CROSS-LINKED MOULDED BODY FROM UHMWPE
#11Techniques for determining formation composition from measured nuclear spectra
#12Methods and Means for Simultaneous Casing Integrity Evaluation and Cement Inspection in a Multiple-Casing Wellbore Environment
#13Optimization of neutron-gamma tools for inelastic gamma-ray logging
#14System, method, and computer program product to determine placement of fracture stimulation points using minerology
#15Method and apparatus for separating gamma and neutron signals from a radiation detector and for gain-stabilizing the detector
#16Multi-tool analysis of annuluses in cased holes
#17Programmable integrated measurement while drilling directional controller
#18Multiple source neutron measurement, device, system and use thereof
#19Neutron-gamma density through normalized inelastic ratio
#20Automated control of electrically operated radiation generators
#21Depth/orientation detection tool and methods thereof
#22Method for using neutron interaction cross section to interpret neutron measurements
#23Multi-variable workflow for cement evaluation in multiple casing strings
#24Radiation generator and power supply configuration for well logging instruments
#25Casing inspection using pulsed neutron measurements
#26Absolute elemental concentrations from nuclear spectroscopy
#27Neutron tool with dual-purpose detector
#28Directional measurements using neutron sources
#29Casing inspection using pulsed neutron measurements
#30Neutron through-pipe measurement, device, system and use thereof
#31Multiple source neutron measurement, device, system and use thereof
#32Target assembly including temperature activated coupler and related methods
#33Borehole fluid effect correction for pulsed neutron porosity measurements
#34Neutron-gamma density through normalized inelastic ratio
#35Detection of tool in pipe
#36Method for cement evaluation with neutron logs
#37Method for measuring subterranean formation density using a neutron generator
#38Neutron Wellbore Imaging Tool
#39DUAL GAMMA RAY AND NEUTRON DETECTOR IN A MULTI-SENSOR APPARATUS AND RELATED METHODS
#40DEPTH/ORIENTATION DETECTION TOOL AND METHODS THEREOF
#41Radiograph acquisition device, radiographic imaging system, and radiographic imaging method
#42Radiation generator and power supply configuration for well logging instruments
#43Optimization of neutron-gamma tools for inelastic-gamma ray logging
#44Neutron detection using a shielded gamma detector
#45Non-rotating logging-while-drilling neutron imaging tool
#46Method and system for pulse neutron capture sigma inversion
#47Apparatus and method for measuring downhole fluid composition and properties
#48Method and apparatus for determining formation water saturation during drilling
#49Correction for low porosity effects on neutron gamma density
#50Detection of tool in pipe
#51Time dependent neutron-gamma spectroscopy
#52Salt concentration logging systems and methods
#53Systems and methods for downhole fluid typing with pulsed neutron logging
#54Lithology pair ratio: a ratio-based lithology indicator using pair production
#55Time dependent measurement of formation properties using pulsed neutron generators
#56Downhole tool for determining formation properties
#57Systems and methods for evaluating formations having unknown or mixed salinity
#58Borehole measurements using a fast and high energy resolution gamma ray detector assembly
#59Use of thorium-uranium ratio as an indicator of hydrocarbon source rock
#60Determining organic carbon downhole from nuclear spectroscopy
#61Neutron source for well logging
#62Method and apparatus for fluid influx detection while drilling
#63Borehole invariant porosity measurement method
#64Sigma/porosity tools with neutron monitors
#65Method for fitting a sum of exponentials to experimental data by linearization using a numerical integration approximation, and its application to well log data
#66Method of correcting density logs for the presence of the casing
#67Method of logging a borehole
#68Method and system for integrating logging tool data and digital rock physics to estimate rock formation properties