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8022928 |
Free-space pointing and handwriting
A position detection method using one or more one-dimensional image sensors for detecting a light source (22) in free space is adapted for use as a portable free-space data input device (20) for...
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7880133 |
Optical multiphase flowmeter
Method and apparatus enable direct measurement of at least one flow velocity for one or more phases within a multiphase fluid mixture flowing in a conduit. Some embodiments provide determination of...
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7723675 |
Well type neutron counter containing an annular He-3 detector tube
The present invention relates to a well type neutron counter containing a He-3 detector which includes at least one annular gas layer in a polyethylene moderator, which includes a body formed of a...
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7700910 |
Method of compensating a density log
A method of compensating a density log comprises the step of compensating the far density by adding a correction at a given point in the density log wherein: (a) the correction comprises at least a...
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7667192 |
Thermal neutron porosity from neutron slowing-down length, formation thermal neutron capture cross section, and bulk density
A method for determining at least one formation property calculated from neutron measurements acquired with a downhole tool includes emitting neutrons from a source in the tool into the formation,...
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7531791 |
Geological tomography using cosmic rays
Disclosed are a system and method configured for detecting cosmic ray muon (CRM) flux along a variety of trajectories through a subterranean test region, collecting the muon detection data, and...
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7511278 |
Apparatus for detecting particles
An apparatus for detecting particles, comprising a plurality of electrically conductive structures disposed on a support element. The structures are electrically insulated from one another and each...
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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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7432500 |
Azimuthal binning of density and porosity data
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. A...
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7328106 |
Method of correcting density logs for the presence of the casing
A gas detection method includes carrying out respective neutron and density logs, using neutron and density detectors, along a length of well. The density log is corrected for the dimensions and...
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7294829 |
Method and apparatus for an improved formation density indicator using pulsed neutron instruments
A pulsed neutron source is used in a density logging tool with three or more detectors. This enables compensation for source variations and provides redundant measurements that are used to make...
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7282704 |
Method for determining formation porosity and gas saturation in a gas reservoir
Measurements made with porosity and density logging tools in a gas reservoir may differ due to invasion effects. The effects are particularly large on measurement-while-drilling applications where...
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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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7206376 |
Fluid density measurement
A wellbore tool for measuring the density of a fluid flowing in a wellbore by a photon attenuation technique includes a tube defining a flow path for the fluid, a photon source at one end of the...
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7151254 |
Logging tool with response invariant to changes in borehole pressure
A logging system for measuring parameters of earth formation penetrated by a well borehole. Measurements made with the system are not adversely affected by varying pressure encountered a borehole...
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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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6825459 |
Dual compensated chlorine logging tool
A well logging tool has a neutron source for irradiating formation surrounding a borehole. Two detectors are mounted in a spaced-apart vertical relationship within the tool pressure-resistant...
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6815665 |
Apparatus and methods for determining gravel pack quality
Apparatus and method for determining the integrity or quality of a gravel pack positioned between the casing and gravel pack screen of a subterranean borehole, with the method including azimuthally...
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6781115 |
Subsurface radiation phenomena detection with combined and azimuthally sensitive detectors
A system and method are disclosed for detecting radiation phenomena in an area surrounding a wellbore traversing an earth formation. A logging instrument is equipped with combined radiation...
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6747270 |
Method and apparatuses for logging hydrocarbon reservoirs
A method, of logging a borehole, for use in a cased oil well for detecting the gas/oil or water/oil contact in a hydrocarbon reservoir, using a neutron capture technique to detect one or more...
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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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6700115 |
Standoff compensation for nuclear measurements
A nuclear logging-while-drilling measuring systems, and the correction of the formation property measurements for adverse effects of instrument standoff from the borehole wall, is disclosed....
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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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6552334 |
Wellbore caliper measurement method using measurements from a gamma-gamma density
Methods are disclosed for determining the standoff of a well logging instrument from the wall of a wellbore and the shape of the wellbore itself. The methods include measuring a compensated...
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6408110 |
Tiled imaging apparatus providing substantially continuous imaging
An imaging apparatus includes a plurality of imaging device tiles arranged on an imaging support. Each of the imaging device tiles includes an imaging device having an imaging surface and a...
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6215120 |
Method for determining symmetry and direction properties of azimuthal gamma ray distributions
A method for determining the azimuthal direction of a maximum in a series of gamma ray count measurements that are each assigned to an azimuthal sector, comprising: determining the x- and...
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5909772 |
Apparatus and method for estimating liquid yield of a gas/condensate reservoir
Apparatus and method for determining a liquid yield from a gas/condensate reservoir. The apparatus and method first determines the porosity at each depth of a reservoir, using open hole logging...
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5847384 |
Method for determining irregularities in a wellbore wall using a gamma-gamma well logging instrument
A method for determining a profile of a wall of a wellbore drilled through earth formations. The earth formations are irradiated by a source of gamma rays. Scattered gamma rays are detected at...
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5841135 |
Method and apparatus for measuring formation density and the formation photo-electric factor with a multi-detector gamma-gamma tool
The present invention is an improved method and tool for determining formation density by using an array of gamma-ray detectors. This invention can correct for large standoffs encountered in...
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5767510 |
Borehole invariant porosity measurement system
Methods of apparatus for determining porosities of earth formations penetrated by a borehole, and more specifically for determining porosities of earth formations while the borehole is being...
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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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5684299 |
Method for determining porosity in an invaded gas reservoir
The formation porosity of a partially invaded gas reservoir in subsurface earth formation is determined from the sum of percentages of density and neutron tool porosities. During the method of this...
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5668369 |
Method and apparatus for lithology-independent well log analysis of formation water saturation
A system and method of determining porosity and water saturation of a formation surrounding a wellbore is disclosed. Well logs are taken to obtain near and far thermal and epithermal neutron log...
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5665972 |
Method and apparatus for monitoring contamination
A method for measuring the fixed contamination level in a confined area such as small diameter pipe. The method measures the accumulated detection response over a given area and prescribed time...
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5635712 |
Method for monitoring the hydraulic fracturing of a subterranean formation
A method for real-time monitoring of fracture extension during a fracturing treatment of a producing subterranean formation. A radioactive tracer injector is coupled to and spaced from a gamma ray...
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5627368 |
Four-detector 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 four detectors which generate four signals enabling the operator to calculate the...
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5596191 |
Method and apparatus for epithermal neutron porosity measurement corrected for tool standoff and formation lithology
A method of determining porosity of an earth formation penetrated by a wellbore including irradiating the earth formation with bursts of neutrons from a source in the wellbore and counting...
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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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5532481 |
System for measuring epithermal neutron porosity having reduced borehole effect
The invention is a system for determining the epithermal neutron decay rate of an earth formation penetrated by a wellbore. A method according to the present invention includes the steps of...
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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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5528029 |
Logging method and apparatus using a pad to measure density
A method of determining a physical parameter of geological formations having a borehole passing therethrough by using a sonde lowered down the borehole at the end of a cable and including a source...
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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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5521378 |
Method and apparatus for gamma ray logging of underground formations
A method for determining the porosity of an underground formation includes the steps of irradiating the formation with neutrons, detecting and measuring gamma rays resulting from irradiation of the...
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5508514 |
Well logging device with a pad
The invention concerns a well logging device with a pad, characterized in that the pad has a nuclear sensor with a gamma ray source and two detectors separated by a space in the longitudinal...
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5481105 |
Neutron backscatter gravel pack logging sonde with azimuthal scan capability
An apparatus (sonde) and method of measuring density, or gravel pack quality, in a cased well borehole using a fast neutron source and one or more thermal neutron detectors is described. In one...
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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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5451779 |
Formation density measurement apparatus and method
A method and apparatus for determining at least one characteristic of a formation is provided which includes storing a plurality of counts received from both a long space radiation detector and a...
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5390115 |
Compensated gamma-gamma density sonde using three detectors
A gamma-gamma sonde for use in determining the bulk density of an earth formation adjacent a borehole comprises a source of gamma radiation and three attenuation-type gamma ray detectors DN, DI and...
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