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| Number | Title | Issue Date |
| 8173953 | Gain stabilization of gamma-ray scintillation detector Systems and methods for stabilizing the gain of a gamma-ray spectroscopy system are provided. In accordance with one embodiment, a method of stabilizing the gain of a gamma-ray spectroscopy system may include generating light corresponding to gamma-rays detected fro... | 05/08/2012 |
| 8173954 | Detector for use in well-logging applications A detector includes a sonde having a housing and comprising a scintillator disposed within the housing and a calibration source coupled to the scintillator to fluoresce the scintillator at a known wavelength of electromagnetic radiation. The detector further include... | 05/08/2012 |
| 8164050 | Multi-channel source assembly for downhole spectroscopy A multi-channel source assembly for downhole spectroscopy has individual sources that generate optical signals across a spectral range of wavelengths. A combining assembly optically combines the generated signals into a combined signal and a routing assembly that sp... | 04/24/2012 |
| 7705295 | Methods and systems for determining mud flow velocity from measurement of an amplitude of an artificially induced radiation Embodiments of the present invention relate in general to methods and apparatus for determining downhole mud flow rates and other downhole parameters. More specifically, but not by way of limitation, an embodiment of the present invention may provide a method for de... | 04/27/2010 |
| 7573026 | Pileup rejection A correction for pileup of measurements made by a nuclear detector is applied by selecting the energy of the first signal in a pileup, ignoring the remaining signals in the pileup, and correcting the count rate by a factor related to the total pulse widths within a ... | 08/11/2009 |
| 7363161 | Pore-scale geometric models for interpretation of downhole formation evaluation data The grain size of a pore-scale geometric model of a clastic earth formation are adjusted so that the NMR relaxation time distribution output of the model matches a measured NMR distribution. Fluid drainage and imbibing can be simulated. Additional properties of the ... | 04/22/2008 |
| 7356413 | Pore-scale geometric models for interpretation of downhole formation evaluation data Parameters of a pore-scale geometric model of a clastic earth formation are adjusted so that the output of the model matches measurements made on a core sample. Additional properties of the earth formation are predicted using the pore-scale model. The additional pro... | 04/08/2008 |
| 7342222 | Method and apparatus for downhole spectroscopy processing A method for downhole spectroscopy processing is described. The method includes: obtaining raw spectroscopy data using a downhole tool; processing the raw spectroscopy data using the downhole tool to obtain a downhole processed solution; transmitting the downhole pr... | 03/11/2008 |
| 7274013 | Automatic gain adjust utility for radiation spectrometers In a preferred embodiment, an automatic gain adjust method for radiation spectrometers, including: placing a calibration source emitting known energies at a radiation detector; acquiring a spectrum of the known energies; automatically analyzing the spectrum and comp... | 09/25/2007 |
| 7257490 | Pore-scale geometric models for interpretation of downhole formation evaluation data Parameters of a pore-scale geometric model of a clastic earth formation are adjusted so that the output of the model matches measurements made one a core sample. Additional properties of the earth formation are predicted using the pore-scale model. The additional pr... | 08/14/2007 |
| 7253401 | Spectral gamma ray logging-while-drilling system A method for determining concentrations of naturally occurring radioactive elements in earth formation by analysis of gamma ray energy spectra measured by at least one gamma ray detector while the borehole is being drilled. Gain of the gamma ray detector is controll... | 08/07/2007 |
| 7227129 | Flowshot technique A pulsed neutron source irradiates an earth formation. The irradiation produces N16 from O16 in a fluid in the borehole, and the gamma rays produced by the subsequent decay of N16 are detected by a plurality of spaced apart detectors... | 06/05/2007 |
| 7205535 | Elemental gamma ray signature instrument Elemental analysis of an earth formation is obtained using measurements from a gamma ray logging tool. From the elemental analysis, an estimate of the mineralogy of the formation is made treating the problem as one of Linear Programming (maximizing an objective func... | 04/17/2007 |
| 7202456 | Gain stabilization apparatus and methods for spectral gamma ray measurement systems Apparatus and methods for measuring gamma ray energy spectra wherein the gain of the measurement system is continuously and automatically adjusted to a standard gain. Gain of the system is controlled automatically through analysis of the measured energy spectra. Alt... | 04/10/2007 |
| 7194360 | Method of determining radioactive nuclides A method of simply and quickly determining α-ray releasing nuclides having long half-life without carrying out a chemical separation is provided. By inputting a data of pulses incident to an α-ray detector in a computer, obtaining time distribution of the i... | 03/20/2007 |
| 7186971 | Flowshot technique A pulsed neutron source irradiates an earth formation. The irradiation produces N16 from O16 in a fluid in the borehole, and the gamma rays produced by the subsequent decay of N16 are detected by a plurality of spaced apart detectors... | 03/06/2007 |
| 7166834 | Method and apparatus for determining the thermal neutron capture cross-section of a subsurface formation from a borehole Data acquired using a pulsed nuclear source are susceptible to two sources of error. One error is due to large statistical noise towards the end of an acquisition window. Another source of error is the contamination of the early portion of the data by borehole and o... | 01/23/2007 |
| 7142625 | Nuclear material detection apparatus and method A device for detecting photonuclear-induced neutrons is described herein. One embodiment of the device may comprise a neutron detector and a detection circuit. The neutron detector may comprise a detector output. The detection circuit may be operatively connected to... | 11/28/2006 |
| 7102125 | Method of logging a borehole In the field of wellbore data logging it is known to use isotopic neutron sources in a neutron capture logging technique. However, continuous isotopic sources are unpopular for regulatory and safety reasons. Attempts to employ neutron generator tubes to gener... | 09/05/2006 |
| 7081616 | Downhole gamma-ray detection A method for evaluating a natural gamma-ray activity within a borehole, comprises the steps of: stabilizing the gain according to a method for stabilizing a gain of a gamma-ray detector for use in a downhole logging tool; ... | 07/25/2006 |
| 7059404 | Variable intensity memory gravel pack imaging apparatus and method An apparatus and method are provided for varying an operating parameter for a nuclear gamma ray tool for evaluating the integrity of gravel packing. The gamma ray outpat intensity and area of investigation are altered by changing a source housing geometry and the ma... | 06/13/2006 |
| 7035778 | Method of assaying downhole occurrences and conditions A method of assaying work of an earth boring bit of a given size and design including establishing characteristics of the bit of given size and design. The method further includes simulating a drilling of a hole in a given formation as a function of the characterist... | 04/25/2006 |
| 7032689 | Method and system for predicting performance of a drilling system of a given formation A method and apparatus for predicting the performance of a drilling system for the drilling of a well bore in a given formation includes generating a geology characteristic of the formation per unit depth according to a prescribed geology model, obtaining specificat... | 04/25/2006 |
| 7015694 | NMR apparatus and method for stochastic pulsing of earth formations Stochastic pulsing using random or pseudo-random sequences is used for determination of nuclear spin properties of earth formations. This reduces the power requirements. Processing of the received signals may include linear or nonlinear cross-correlation with the ex... | 03/21/2006 |
| 6997257 | Apparatus and method for determining the dip of an underground formation in a cased or uncased borehole A well logging system that has, as its goal, the collection of information normally acquired by a dip log tool based on conductivity or resistivity measurements, but with the advantages of radiation based well logging systems. Unlike conductivity based dip log syste... | 02/14/2006 |
| 6915849 | Apparatus and methods for conveying instrumentation within a borehole using continuous sucker rod The present invention provides an apparatus and method for conveying downhole tools within a borehole using a continuous rod. The apparatus may include a continuous rod, a downhole tool attached to one end of the continuous rod, and a delivery rig for lowering the c... | 07/12/2005 |
| 6909969 | Method of through-casing gas detection 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 properties of the well casing. The corrected density log is then combin... | 06/21/2005 |
| 6766855 | Apparatus and method for determining the dip of an underground formation in a cased or uncased borehole A well logging system that has, as its goal, the collection of information normally acquired by a dip log tool based on conductivity or resistivity measurements, but with the advantages of radiation based well logging systems. Unlike conductivity based dip log syste... | 07/27/2004 |
| 6696684 | Formation evaluation through azimuthal tool-path identification A method for tool path identification in formation evaluation includes obtaining measurements of formation properties in azimuthal sectors for each of a plurality of depth levels; calculating quality factors from the measurements; identifying a centroid o... | 02/24/2004 |
| 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 substrate processing system is detected over a period of ti... | 02/24/2004 |
| 6476384 | Methods and apparatus for downhole fluids analysis A method of determining GOR comprising subjecting a fluid to spectroscopic analysis at a first wavelength sensitive to gas and a second wavelength sensitive to oil, determining a response matrix for the contribution of gas at the first and second waveleng... | 11/05/2002 |
| 6369393 | Digital pulse de-randomization for radiation spectroscopy In a preferred embodiment, a method of digitally de-randomizing pulses in a radiation spectroscopy system, the method including the steps of: receiving an input signal representative of a radiation detector output; analyzing the input signal to derive sep... | 04/09/2002 |
| 6307199 | Compensation of errors in logging-while-drilling density measurements A system is disclosed for compensating well logs for adverse effects of the borehole and near borehole formation effects. The system is configured primarily for processing logging-while-drilling (LWD) density measurements, and includes means for generatin... | 10/23/2001 |
| 6057542 | System for determining composition of radionuclides A system for determining a composition of radionuclides in, for instance, a mineral-containing material by detecting gamma and/or X-ray radiation emitted by the nuclides is disclosed. To that end, the system has a detector unit which supplies an electrica... | 05/02/2000 |
| 6037585 | Determination of radioactive scale distribution using gamma ray logging technique A method for calculating the position and quantity of scale downhole, while avoiding the need to run a before log is provided. The method includes assessing the gamma ray spectra of both scale and tracers in a single logging pass. A matrix of multipliers ... | 03/14/2000 |
| 5777323 | Method for logging an earth formation using recycled alpha data A method for determining a characteristic of an earth formation traversed by a borehole precisely monitors the hydrocarbon saturation change during production of an oil field. For an initial logging pass, inelastic gamma ray spectra are detected in respon... | 07/07/1998 |
| 5744803 | Radiation detector assembly and method with discrimination between vibration and radiation induced events A well logging instrument and method that remove vibration induced noise from the output of a detector including a scintillation crystal. The invention is based on a realization that pulses induced by vibration during MWD operations are characteristically... | 04/28/1998 |
| 5744804 | System for determining a compositon of radionuclides The system relates to a system for determining a composition of radionuclides in, for instance, a mineral-containing material by detecting gamma and/or X-ray radiation emitted by the nuclides. To that end, the system comprises a detector unit (2,6, 10) wh... | 04/28/1998 |
| 5672867 | Method for filtering gamma ray well logging tool response to enhance vertical detail while suppressing statistical noise A typical nuclear well logging tool forms a count rate data stream including statistical noise. A robust single pass partially deconvolved smoothing filter matched to the tool response is applied to the count rate data to enhance vertical resolution while... | 09/30/1997 |
| 5635711 | Apparatus and method for the suppression of microphonic noise in proportional counters for borehole logging-while-drilling A method and apparatus is disclosed for suppressing microphonic noise in proportional counter neutron detection in borehole logging-while-drilling measurements. Noise is reduced by (1) applying the outputs of two detectors respectively to positive and neg... | 06/03/1997 |
