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7482579 |
Method and apparatus for high resolution gamma ray measurements
A method for measuring radiation, the method includes selecting at least two radiation detectors, each detector having a spatial resolution that differs from the spatial resolution of other...
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7279677 |
Measuring wellbore diameter with an LWD instrument using compton and photoelectric effects
A method for determining the diameter of a wellbore, the wellbore being drilled by a drill string immersed in weighted mud, the weighted mud having a significant weight fraction of a heavy...
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7159672 |
Mapping tool for tracking and/or guiding an underground boring tool
A portable mapping tool for use in a horizontal drilling system and associated methods use a boring tool configured for transmitting a locating signal. The mapping tool also includes at least one...
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7129477 |
Method of processing data from a dual detector LWD density logging instrument coupled with an acoustic standoff measurement
A logging-while-drilling density sensor includes a gamma ray source and at least two NaI detectors spaced apart from the source for determining measurements indicative of the formation density. An...
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7099503 |
Image reconstruction method and X-ray CT apparatus
For the purpose of reducing artifacts caused by a scan plane tilted with respect to a rotation plane when a multi-row detector is employed, a j-th detector row which an X-ray passing through a...
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7085405 |
Direct tomographic reconstruction
A method of reconstructing tomography images comprising: acquiring data on individual radiation events; distributing a weight of the individual radiation events along a line of flight associated...
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7080698 |
Mapping tool for tracking and/or guiding an underground boring tool
A portable mapping tool for use in a horizontal drilling system and associated methods use a boring tool configured for transmitting a locating signal. The mapping tool also includes at least one...
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6918293 |
System and method having radiation intensity measurements with standoff correction
We disclose density measurement methods that are accurate over an extended range of standoff distances. One method embodiment includes: a) obtaining a standoff distance, a near detector count rate,...
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6732059 |
Ultra-low background gas-filled alpha counter
A method and counter for reducing the background counting rate in gas-filled alpha particle counters wherein the counter is constructed in such a manner as to exaggerate the differences in the...
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6696362 |
Method for using an in situ particle sensor for monitoring particle performance in plasma deposition processes
Methods are provided for identifying root causes of particle issues and for developing particle-robust process recipes in plasma deposition processes. The presence of in situ particles within the...
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6124590 |
Method for determining thermal neutron capture cross-section of earth formations using measurements from multiple capture gamma ray detectors
A method for determining thermal neutron capture cross-section of an earth formation penetrated by a wellbore from counts of capture gamma rays detected at spaced apart locations from a source...
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5705812 |
Compaction monitoring instrument system
An apparatus and method for detecting the location of subsurface markers in a formation proximate to a borehole. The apparatus includes marker detectors in a housing having at least two housing...
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5591967 |
Method and apparatus for determining neutron detector operability using gamma ray sources
The invention relates to an apparatus and method for verifying the operability of neutron detectors and associated pulse generating circuits in a neutron logging tool prior to committing the tool...
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5536938 |
Pulsed neutron decay logging
A borehole logging tool having a pair of spaced-apart detectors records intensity signals representing the die-away of nuclear radiation in a subsurface formation. Weighted moments of the intensity...
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5530243 |
Formation density well logging tool with detector array for compensation of wellbore roughness and tool tilt
A method for determining density of a formation. The method includes irradiating the formation with gamma rays having energy consistent with Compton scattering. Gamma rays are measured at axially...
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5528030 |
System for determining gas saturation of a formation and a wellbore through casing
A system for determining formation gas saturation in a cased wellbore which includes a neutron logging tool having a source, a first neutron detector offset towards the wellbore primarily sensitive...
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5525797 |
Formation density tool for use in cased and open holes
An improved formation density logging tool is provided that is effective in cased holes. The improved tool utilizes three detectors: a first detector for primarily compensating for the casing; a...
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5461909 |
Oxygen activation method for quantitative water flow measurements within and behind well bore casing
A method for measuring the linear flow velocity, radial position, direction, and the flow rate of water flowing within and behind a well borehole casing. A logging tool containing a source of...
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5459314 |
Method for correcting density measurements that are affected by natural and neutron-induced gamma radiation
A method for measuring formation density corrected for activated gamma radiation. The formation adjacent the borehole is irradiated with low energy gamma radiation from a density tool source. At...
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5408097 |
Method and apparatus for correcting natural gamma ray measurements for borehole fluid effects
A method and apparatus for detecting natural gamma-ray signals of an earth formation and correcting these gamma-ray signals for effects from borehole gamma-rays. Gamma-ray signals are detected at...
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5397893 |
Method for analyzing formation data from a formation evaluation measurement-while-drilling logging tool
A method for analyzing data from a measurement-while-drilling (MWD) formation evaluation logging tool which compensates for rotation of the logging tool (along with the rest of the drillstring)...
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5357797 |
Method and apparatus for correcting MWD porosity measurement
A porosity measuring MWD system utilizing a source and two detectors is set forth. The source and two detectors are preferably mounted in a stabilizer fin on a drill collar. A standoff measuring...
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5350925 |
Methods for determining values for earth formation properties
Methods are provided for processing spectral data detected by a gamma ray detector of a borehole tool in order to obtain quantitative determinations of formation and/or borehole properties....
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5345077 |
Method and apparatus for producing a porosity log of a subsurface formation corrected for detector standoff
A borehole logging tool is lowered into a borehole traversing a subsurface formation and a neutron detector measures the die-away of nuclear radiation in the formation. A model of the die-away of...
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5272336 |
Temperature corrections of measurements made with scintillation detectors
This disclosure sets out a method for applying a temperature correction to calculations that employ measurements made with scintillation detectors. Temperature measurements are made at or near the...
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5175429 |
Stand-off compensation for nuclear MWD measurement
The present invention relates generally to increasing the accuracy of MWD nuclear based measurement systems. Specifically, the present invention provides a secondary measurement system for...
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5097123 |
Broad energy spectra neutron source for logging and method
Logging method and tool string for identifying and determining the concentrations of subsurface formation elements next to a borehole, by (i) using a broad energy spectra neutron source (such as a...
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5065016 |
Radioactive well logging to determine vertical brine flow
Brines in earth formations in the vicinity of a well borehole are bombarded with neutrons. The neutrons are slowed to thermal energy and captured by sodium atoms in the brine according to the...
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5055675 |
Pulse height analyzer for spectroscopy thermal multigate decay well logging system
A pulse height analyzer for spectrocopy thermal multigate decay well logging systems is disclosed and has an input section comprising a peak time determining circuit locating a peak occurrence. The...
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5055676 |
Method for determining oil and water saturation in earth formation surrounding a borehole
A method and an apparatus for determining the hydrocarbon saturation S o in an earth formation surrounding a borehole, and/or the hydrocarbon saturation C b in said borehole, comprising:...
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5021653 |
Geochemical logging apparatus and method for determining concentrations of formation elements next to a borehole
Logging method and tool string for identifying and determining the concentrations of subsurface formation elements next to a borehole, by (i) using a low energy neutron source (either a chemical...
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5019708 |
Method for eliminating the effect of rugosity from compensated formation logs by geometrical response matching
A method for determining the compensated density of a subsurface geological formation wherein the effect of borehole rugosity is reduced or eliminated utilizes the differences in the vertical...
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4982086 |
Method of porosity determination in porous media by x-ray computed tomography
A method for porosity determination in porous media such as earth and rock core samples by x-ray computed tomography in which a sample of the porous medium is scanned after saturation with a first...
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4926044 |
Thermal decay time logging method and apparatus
A novel neutron burst timing, detection, and calculation method and apparatus are disclosed for a Thermal Decay Time Logging System. A neutron bursting regime is provided which includes a short...
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4910397 |
Pulsed neutron porosity logging
A borehole logging tool employing a pulsed neutron source and a pair of spaced-apart epithermal neutron detectors is lowered into a borehole traversing a subsurface formation. The formation is...
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4894534 |
Logging apparatus and method
Downhole measuring apparatus includes a gamma radiation source and at least two pairs of radiation detectors carried by a housing so that radiation may be emitted from the source and scattered by...
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4705944 |
Formation density logging while drilling
A gamma ray density sub and method useful for measurement-while-drilling applications utilizing a gamma ray source and detector located on the rotating sub and computation of the product of the...
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4698501 |
System for simultaneous gamma-gamma formation density logging while drilling
A system for logging subterranean formations for the determination of formation density by using gamma radiation. Gamma ray source and detection means are disposed within a housing adapted for...
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4697078 |
Method for quality control of counting logs
A generalized computer-based system and method for acquisition of nuclear well logging data. A feature of the present invention is the ability to provide time distribution spectra over the entire...
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4668863 |
Neutron logging time spectral data acquisition system and method
A generalized computer-based system and method for acquisition of nuclear well logging data, including downhole generation of spectral information. A downhole instrument traverses a borehole...
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4656354 |
Method for induced gamma ray logging
A generalized computer-based system and method for acquisition of nuclear well logging data. A feature of the present invention is the ability to provide time distribution spectra over the entire...
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4645927 |
Clay type and volume evaluation
Methods for the determination of clay types and/or clay volumes of an earth formation are disclosed. Information as to the hydroxyl type of the clay minerals is obtained from the difference between...
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4638158 |
Gamma ray measurement of earth formation properties using a position sensitive scintillation detector
A well logging system for measuring the radial density distribution of earth formations in the vicinity of a well borehole is provided. The system utilizes a single position sensitive gamma ray...
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4604522 |
Method and apparatus for logging a borehole employing dual radiation detectors
The disclosure relates to a method and apparatus for logging a borehole. A sonde having a source of penetrating radiation and at least two longitudinally-spaced radiation detectors is passed within...
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4524273 |
Method and apparatus for gamma ray well logging
A radioactive logging source carried by a logging tool injects gamma rays into the formation. A detector generates a pulse for each gamma ray incident upon the detector having an amplitude...
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4423323 |
Neutron logging method and apparatus for determining a formation characteristic free of environmental effects
A method for determining porosity or other formation characteristic of a sub-surface geological formation traversed by a borehole is claimed. A neutron logging tool is passed through the borehole...
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4302669 |
Neutron thermalization time logging
Method and apparatus for pulsed neutron logging employing detectors of different energy-dependent sensitivities to neutrons at energy levels less than the chemical binding energy of hydrogen in...
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4283624 |
Epithermal neutron decay logging
Method and apparatus for epithermal neutron decay logging wherein the formation under investigation is irradiated with bursts of fast neutrons which are moderated therein to form a population of...
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4266126 |
Pulsed radiation decay logging
Methods and apparatus for radioactive well logging in which the formation is irradiated with bursts of primary radiation and the resulting secondary radiation is measured during a plurality of time...
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4251724 |
Method and apparatus for determination of temperature, neutron absorption cross section and neutron moderating power
A nuclear method and apparatus determines the temperature of a medium by injecting fast neutrons into the medium and detecting returning slow neutrons in three first energy ranges by producing...
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