173365 ⎘
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 the secondary Y-rays produced in the surrounding layers of the bore hole
Sub-classes:CONSTRAINING SPECTRAL DECOMPOSITION USING PEAKS
#2DETERMINATION OF MINERALOGY AND LITHOLOGY FROM ELEMENTAL DATA
#3Replaceable Thermal Neutron Absorbing Sleeve For Neutron Detector
#4SPECTRAL ALIGNMENT METHOD FOR INDUCED GAMMA RAY LOGGING
#5OUT OF RANGE GAMMA RAY ELEMENTAL YIELD SUPPRESSION
#6COMPENSATED NEUTRON GAMMA DENSITY
#7ROCK PROPERTY MEASUREMENTS BASED ON SPECTROSCOPY DATA
#8Compensated formation saturation using assisted physics and neural networks
#9Through-tubing, cased-hole sealed material density evaluation using gamma ray measurements
#10Density Measurement Of A Selected Layer By Gamma Spectral Deconvolution
#11Estimating mineralogy and reconstructing elements of reservoir rock from spectroscopy data
#12Holdup algorithm using assisted-physics neural networks
#13Large depth-of-investigation pulsed neutron measurements and enhanced reservoir saturation evaluation
#14Density measurement of a selected layer by gamma spectral deconvolution
#15Gamma ray spectrum unfolding method for elemental capture spectroscopy logging and device therefor
#16Drilling fluid activation correction via neutron generator modulation
#17Measuring spectral contributions of elements in regions in and about a borehole using a borehole spectroscopy tool
#18Evaluating drill-in fluid performance in a wellbore
#19Associated particle detection for performing neutron flux calibration and imaging
#20Neutron imaging devices for cased wells and open boreholes
#21Formation imaging using neutron activation
#22High transmittance single crystal YAP scintillators
#23Compensated spectroscopy measurements
#24Gamma ray counter
#25Techniques for determining formation composition from measured nuclear spectra
#26TAGGED CHEMICAL DIVERTER
#27Systems and methods to determine relative elemental concentrations from nuclear spectroscopy measurements
#28Cement evaluation using neutron tool
#29WATER SATURATION DETERMINATION USING AN OXYGEN ESTIMATE AND FORMATION LITHOLOGY
#30Water saturation determination using an oxygen estimate and formation lithology
#31SCINTILLATING GAMMA RAY SPECTROMETER AND ITS USE IN MUD LOGGING SYSTEM
#32Method for evaluating formations using neutron induced gamma ray measurements
#33Nuclear well logging tool with at least one gamma-ray scintillation detector employing a thallium-based scintillator material
#34Method of acquiring rock component content of stratum
#35High transmittance single crystal YAP scintillators
#36Material evaluation using nuclear logging tool
#37Optimization of neutron-gamma tools for inelastic gamma-ray logging
#38Tagged chemical diverter
#39Method and device for measuring formation elemental capture gamma ray spectra
#40Characterization of non-radioactive laced cement using logging while drilling and wireline nuclear measurements
#41Method for correcting natural gamma ray logging measurements
#42Multi-sensor workflow for evaluation of water flow in multiple casing strings with distributed sensors data
#43Method and system for monitoring for scale
#44Compensated sigma from measurements made by a pulsed neutron instrument
#45Non-radioactive tracer materials for monitoring treatment fluids in subterranean formations
#46Method and system for correcting a natural gamma-ray measurement performed in a wellbore
#47Compact scintillation detector
#48Near-bit gamma ray sensors in a rotating section of a rotary steerable system
#49Capture gamma ray spectroscopy for analyzing gravel-packs, frac-packs and cement
#50Digital spectrometer for measuring ironizing radiation downhole
#51Downhole tomographic imaging
#52Determining casing fluid capture cross section using gamma count rate ratio
#53Gamma-ray detectors for downhole applications
#54Neutron Gamma Density Fast Neutron Correction Using A Direct Fast Neutron Detector
#55Neutron-induced gamma-ray spectroscopy that accounts for environmental dependence of inelastic gamma-ray emission spectra
#56Apparatus and methods for determining real-time hole cleaning and drilled cuttings density quantification using nucleonic densitometers
#57High transmittance single crystal YAP scintillators
#58Method for filtering for interpretation of neutron induced gamma ray measurements
#59Method and apparatus for downhole sensing using neutron pulses and gamma radiation measurements
#60Method for evaluating formations using neutron induced gamma ray measurements
#61Borehole fluid and/or casing effect correction for pulsed neutron measurements
#62Method for using neutron interaction cross section to interpret neutron measurements
#63System and method for making downhole measurements
#64Neutron-absorbing gamma ray window in a downhole tool
#65System and method for gain regulation
#66Water saturation determination using an oxygen estimate and formation lithology
#67Multi-sensor workflow for evaluation of water flow in multiple casing strings
#68Multi-sensor workflow for evaluation of water flow in multiple casing strings with distributed sensors data
#69Casing inspection using pulsed neutron measurements
#70Downhole evaluation with neutron activation measurement
#71Method for using neutron interaction cross section to interpret neutron measurements
#72Characterizing a downhole environment using stiffness coefficients
#73Apparatus and methods for leak detection in wellbores using nonradioactive tracers
#74Method and system of a neutron tube
#75Correction to Determined Formation Sulfur to Account for Sulfur in the Wellbore
#76Pulsed neutron well logging method for determining multiple formation parameters
#77Casing inspection using pulsed neutron measurements
#78Systems, computer medium and computer-implemented methods for logging using a logging tool with adjustable detectors
#79Borehole tool calibration method
#80Geological constituent estimation using calculated spectra relationships
#81Neutron and gamma sensitive fiber scintillators
#82Hydrocarbon saturation from total organic carbon logs derived from inelastic and capture nuclear spectroscopy
#83Method for using neutron interaction cross section to interpret neutron measurements
#84High transmittance single crystal YAP scintillators
#85Compensated sigma from measurements made by a pulsed neutron instrument
#86Composition-matched inelastic or capture spectroscopy tool
#87Measurement of downhole gamma radiation by reduction of compton scattering
#88Pulsed-neutron tool methods and systems for monitoring casing corrosion
#89Downhole cement evalution using pulsed neutron measurements
#90Formation imaging using neutron activation
#91Pulsed neutron tool for downhole oil typing
#92Gamma-ray detectors for downhole applications
#93Global Calibration Based Reservoir Quality Prediction from Real-Time Geochemical Data Measurements
#94System and method of determining a value indicative of hydrogen index
#95System and method of determining a value indicative of hydrogen index
#96Target extender in radiation generator
#97Method for measuring formation water salinity from within a borehole
#98Sourceless density measurements with neutron induced gamma normalization
#99Method and system of resin evaluation using pulsed neutron tools
#100Ion source having negatively biased extractor
#101Nuclear spectroscopy corrections using multiple standards and spatial regions
#102System and method for gain regulation
#103Method of determining a value indicative of fracture quality
#104Method and system of determining a value indicative of gas saturation of a formation
#105Environmental Corrections in Nuclear Spectroscopy Using Variable Shape Standard
#106Environmental corrections in nuclear spectroscopy using variable element ratio
#107Neutron porosity based on one or more gamma ray detectors and a pulsed neutron source
#108NON-RADIOACTIVE TAGGED CEMENT ADDITIVE FOR CEMENT EVALUATION IN A WELL SYSTEM
#109Method for measuring subterranean formation density using a neutron generator
#110Pulse neutron formation gas identification with LWD measurements
#111Gamma-ray detectors for downhole applications
#112Identification of neutron capture from a pulsed neutron logging tool
#113Combining inelastic and capture gamma ray spectroscopy for determining formation elemental
#114Method and apparatus for gain regulation in a gamma detector
#115Method and system of determining elemental content of an earth formation
#116Method and system of determining a parameter associated with a formation corrected for neutrons produced
#117Neutron logging tool with multiple detectors
#118APPARATUS AND METHOD FOR WELL LOGGING UTILIZING ASSOCIATE PARTICLE IMAGING
#119Lithology and borehole condition independent methods for locating tagged proppant in induced subterranean formation fractures
#120Methods for sourceless density downhole measurement using pulsed neutron generator
#121Multiposition target plane for variable source-detector distance using DD, DT sealed neutron source
#122Targetless pulsed neutron generator using beam-beam interaction
#123Measurement of formation porosity using a single gamma ray detector
#124METHOD OF CALCULATING FORMATION CHARACTERISTICS
#125Sourceless Density Measurement Using Activation
#126Test formation apparatus for a downhole tool
#127Optimization of neutron-gamma tools for inelastic-gamma ray logging
#128Method of determining density of underground formations using neutron-gamma ray measurements
#129Method and apparatus for interrogating a subterranean annulus
#130Downhole carbon logging apparatus, systems, and methods
#131Spectral identification of proppant in subterranean fracture zones
#132Method and apparatus for evaluating a cemented borehole casing
#133Water saturation determination using an oxygen estimate and formation lithology
#134Elemental concentration determination using neutron-induced activation gamma radiation
#135Elemental concentration determination using neutron-induced activation gamma radiation
#136Using LWT service to identify loss circulation areas in a wellbore
#137Apparatus and method for pulsed neutron measurement
#138Gamma-ray detectors for downhole applications
#139Method and tool for determination of fracture geometry in subterranean formations based on in-situ neutron activation analysis
#140Apparatus and algorithm for measuring formation bulk density
#141Nuclear logging tool calibration system and method
#142Method and system of processing gamma count rate curves using neural networks
#143Method and apparatus for borehole logging
#144Actinide/beryllium neutron sources with reduced dispersion characteristics
#145Apparatus and method for well logging utilizing associate particle imaging
#146Sourceless gamma ray production system and methods
#147Methods of identifying high neutron capture cross section doped proppant in induced subterranean formation fractures
#148ONLINE SOURCELESS ENERGY CALIBRATION OF MULTIPLE SPECTRAL DETECTORS
#149Pulsed neutron based monitoring of COin enhanced recovery and sequestration projects
#150Source compensated formation density measurement method by using a pulsed neutron generator
#151Use of chemically and geologically consistent constraints for obtaining elemental chemistry downhole
#152METHOD OF DETECTING GAS IN A FORMATION USING CAPTURE CROSS-SECTION FROM A PULSED NEUTRON DEVICE
#153Method and system for calculating extent of a formation treatment material in a formation
#154Wide band gap semiconductor photodetector based gamma ray detectors for well logging applications
#155Determining formation characteristics
#156SIGMA MEASUREMENT DOWNHOLE
#157METHOD FOR DOWNHOLE, NON-ISOTOPIC GENERATION OF NEUTRONS AND AN APPARATUS FOR USE WHEN PRACTISING THE METHOD
#158Nuclear logging tool
#159Method for determining formation water resistivity from a wireline pulsed neutron device
#160Determining downhole fluid flow
#161Azimuthal elemental imaging
#162APPARATUS AND METHOD FOR DETECTING GAMMA RAY RADIATION
#163Inelastic background correction for a pulsed-neutron instrument
#164MEASUREMENT OF HYDRAULIC CONDUCTIVITY USING A RADIOACTIVE OR ACTIVATABLE TRACER
#165Methods of identifying high neutron capture cross section doped proppant in induced subterranean formation fractures
#166Method of logging a well using a thermal neutron absorbing material
#167Methods and apparatus for exploring geological formations utilizing strontium measurements
#168Azimuthal elemental imaging
#169Azimuthal elemental imaging
#170Method and tool for determination of fracture geometry in subterranean formations based on in-situ neutron activation analysis
#171Use of elemental pulse neutron spectroscopy measurements for indexing bitumen viscosity in the well
#172Method and apparatus for determining silicon content of the earth formations in cased well bores
#173Shielded pads for detecting subsurface radiation phenomena
#174Apparatus and method for detecting gamma ray radiation
#175Method and related system of pulsed neutron logging
#176Methods for quantitative lithological and mineralogical evaluation of subsurface formations
#177Neutron source for well logging
#178Method of calibrating multi-channel nuclear energy spectra
#179Measuring inflow performance with a neutron logging tool
#180Downhole navigation and detection system
#181Measurement of water-oil saturation using pulsed neutron instrumentation
#182Determination of gas pressure and saturation simultaneously
#183Measurement of formation gas pressure in cased wellbores using pulsed neutron instrumentation
#184Measurement of formation gas saturation in cased wellbores using pulsed neutron instrumentation
#185Pulsed-neutron formation density
#186Method and apparatus for an improved formation density indicator using pulsed neutron instruments
#187Corrections of gamma-ray responses
#188Shielded pads for detecting subsurface radiation phenomena
#189Apparatus and method for determining the dip of an underground formation in a cased or uncased borehole
#190Method and apparatus for determining aluminum concentration in earth formations
#191Elemental gamma ray signature instrument
#192Downhole gamma-ray detection
#193Fiber optic brush light detector and method
#194Pulsed-neutron formation density
#195Mud activation measurement while drilling
#196Nanostructured glass ceramic neutron shield for down-hole thermal neutron porosity measurement tools
#197Method and system for integrating logging tool data and digital rock physics to estimate rock formation properties