Having Plural Detectors Patents (Class 250/264)
  • Patent number: 11078771
    Abstract: Methods are provided for determining the location and height of cement in a subterranean borehole region using pulsed neutron capture (PNC) logging tools. The methods include obtaining a pre-cementing data set, placing in the borehole region a cement slurry that includes a liquid a thermal neutron absorbing material, obtaining a post-cementing data set, comparing the pre-cementing data set and the post-cementing data set to determine the location of the cement, and correlating the location of the cement to a depth measurement of the borehole to determine the location and height of the cement placed in the borehole region.
    Type: Grant
    Filed: December 24, 2018
    Date of Patent: August 3, 2021
    Assignee: CARBO CERAMICS, INC.
    Inventors: Xiaogang Han, Harry D. Smith, Jr., Robert Duenckel, Jeremy Zhang
  • Patent number: 10866336
    Abstract: A method for determining azimuthal formation information using neutron activation, wherein the formation is activated by a neutron source and the activation signal is measured by at least one detector trailing the neutron source during the logging operation. The number of detected gamma rays as a function of the detector azimuth may be used to provide azimuthal information for determining an image of the formation surrounding the borehole.
    Type: Grant
    Filed: February 17, 2020
    Date of Patent: December 15, 2020
    Assignee: SCHLUMBERGER TECHNOLOGY CORPORATION
    Inventor: Christian Stoller
  • Patent number: 10845502
    Abstract: Systems, methods, and devices for inelastic gamma-ray logging are provided. In one embodiment, such a method includes emitting neutrons into a subterranean formation from a downhole tool to produce inelastic gamma-rays, detecting a portion of the inelastic gamma-rays that scatter back to the downhole tool to obtain an inelastic gamma-ray signal, and determining a property of the subterranean formation based at least in part on the inelastic gamma-ray signal. The inelastic gamma-ray signal may be substantially free of epithermal and thermal neutron capture background.
    Type: Grant
    Filed: February 12, 2018
    Date of Patent: November 24, 2020
    Assignee: SCHLUMBERGER TECHNOLOGY CORPORATION
    Inventors: Kenneth E. Stephenson, David Rose, Avtandil Tkabladze, Christian Stoller, John J. Simonetti
  • Patent number: 10725201
    Abstract: Estimating a correction factor from logs of compensated thermal neutron porosity measurements, including modeling each measurement of the compensated thermal neutron porosity measurements of the log as resulting from at least: i) a first contribution correlated to an absorbance of a first portion of neutrons produced by irradiation of the volume attributable to interactions in the volume indicative of pore space in the matrix, and ii) a second contribution correlated to an absorbance of a second portion of the neutrons attributable to trace elements of at least one dominant neutron absorber in the formation; iii) a third contribution correlated to an absorbance of a third portion of the neutrons attributable to dry minerals in the matrix other than dominant neutron absorbers; and estimating the second contribution and determining the correction factor from the second contribution; and correcting a compensated thermal neutron porosity measurement using the correction factor.
    Type: Grant
    Filed: September 19, 2018
    Date of Patent: July 28, 2020
    Assignee: Baker Hughes, a GE Company, LLC
    Inventors: Freddy Mendez, Hao Zhang, John M. Longo
  • Patent number: 10698131
    Abstract: Methods may include estimating the weight fractions of kerogen and inorganic mineral components of at least an interval of a subsurface formation; determining the grain density of kerogen and inorganic mineral components, wherein at least the grain density of kerogen is determined by one or more infrared measurements; and calculating the formation matrix density of at least an interval of the subsurface formation from the estimated weight fractions and the determined grain density.
    Type: Grant
    Filed: February 25, 2016
    Date of Patent: June 30, 2020
    Assignee: Schlumberger Technology Corporation
    Inventors: Paul Ryan Craddock, Andrew Pomerantz, Frank Shray
  • Patent number: 10697290
    Abstract: A formation monitoring system includes a casing that defines an annular space within a borehole. A distributed magnetomotive force sensor is positioned in the annular space and configured to communicate with the surface via a fiber-optic cable. A computer coupled to the fiber-optic cable receives measurements and responsively derives the location of any fluid fronts in the vicinity such as an approaching flood front to enable corrective action before breakthrough. A formation monitoring method includes: injecting a first fluid into a reservoir formation; producing a second fluid from the reservoir formation via a casing in a borehole; collecting magnetic field measurements with a distributed magnetomotive force sensor in an annular space between the casing and the borehole, communicating measurements to a surface interface via one or more fiber-optic cables; and operating on the measurements to locate a front between the first and second fluids.
    Type: Grant
    Filed: September 28, 2015
    Date of Patent: June 30, 2020
    Assignee: Halliburton Energy Services, Inc.
    Inventors: Glenn Andrew Wilson, Tasneem A. Mandviwala, Ahmed Fouda, Burkay Donderici, Etienne M. Samson
  • Patent number: 10458930
    Abstract: The presence of chlorine and nitrogen are determined and measured using a non-invasive portable neutron-generating and gamma ray detecting system(s). Portable devices of the present invention can also be used to detect chlorine and/or nitrogen-containing underground objects rapidly and on-site. Devices and systems described herein can be operated remotely and pre-programmed with search patterns, guided by an operator remotely, or programmed to home in on high-chlorine and/or nitrogen concentration areas.
    Type: Grant
    Filed: April 24, 2017
    Date of Patent: October 29, 2019
    Assignee: The United States of America, as represented by The Secretary of Agriculture
    Inventors: Henry A. Torbert, III, Stephen A. Prior, Aleksandr G. Kavetskiy, Galina N. Yakubova
  • Patent number: 10261214
    Abstract: A method for separating and quantifying gamma ray induced and neutron induced responses in a radiation detector includes detecting radiation in a radiation field comprising neutrons and gamma rays. The detected events are converted into a detector pulse amplitude spectrum. The pulse amplitude spectrum is decomposed into contributions from detected gamma rays and detected neutrons using gamma ray standard spectra and neutron standard spectra and a spectral fitting procedure which results in a best fit between a weighted sum of the contributions and the detector pulse amplitude spectrum. The fitting procedure includes determining fitting parameters for each of the standard spectra wherein at least one of the fitting parameters is different for the gamma ray standard spectra and the neutron standard spectra. In one embodiment, the fitting parameter is spectral gain.
    Type: Grant
    Filed: May 2, 2016
    Date of Patent: April 16, 2019
    Assignee: SCHLUMBERGER TECHNOLOGY CORPORATION
    Inventor: Christian Stoller
  • Patent number: 10161237
    Abstract: Methods are provided for determining the location and height of a fracture in a subterranean formation using pulsed neutron capture (PNC) logging tools. The methods include obtaining a pre-fracture data set, hydraulically fracturing the formation with a slurry that includes a liquid and a proppant in which at least a portion of the proppant is tagged with a thermal neutron absorbing material, obtaining a post-fracture data set, comparing the pre-fracture data set and the post-fracture data set to determine the location of the proppant, and correlating the location of the proppant to a depth measurement of the borehole to determine the location and height of the propped fracture.
    Type: Grant
    Filed: July 21, 2015
    Date of Patent: December 25, 2018
    Assignee: CARBO Ceramics Inc.
    Inventors: Xiaogang Han, Harry D. Smith, Jr., Robert Duenckel, Qianmei (Jeremy) Zhang
  • Patent number: 10102649
    Abstract: The present invention is notably directed to computer-implemented methods and systems for recovering an image. Present methods comprise: accessing signal data representing signals; identifying subsets of points arranged so as to span a region of interest as current subsets of points; reconstructing an image based on current subsets of points, by combining signal data associated to the current subsets of points; detecting one or more signal features in a last image reconstructed; for each of the detected one or more signal features, modifying one or more subsets of the current subsets, so as to increase, for each of the modified one or more subsets, a relative number of points at a location of said each of the detected one or more signal features.
    Type: Grant
    Filed: October 8, 2015
    Date of Patent: October 16, 2018
    Assignee: International Business Machines Corporation
    Inventors: Giovanni Cherubini, Paul Hurley, Sanaz Kazemi, Matthieu Simeoni
  • Patent number: 10061055
    Abstract: Systems and methods for estimating absolute elemental concentrations of a subterranean formation from neutron-induced gamma-ray spectroscopy are provided. In one example, a system for estimating an absolute yield of an element in a subterranean formation may include a downhole tool and data processing circuitry. The downhole tool may include a neutron source to emit neutrons into the formation, a neutron monitor to detect a count rate of the emitted neutrons, and a gamma-ray detector to obtain gamma-ray spectra deriving at least in part from inelastic gamma-rays produced by inelastic scattering events and neutron capture gamma-rays produced by neutron capture events. The data processing circuitry may be configured to determine a relative elemental yield from the gamma-ray spectra and to determine an absolute elemental yield based at least in part on a normalization of the relative elemental yield to the count rate of the emitted neutrons.
    Type: Grant
    Filed: June 29, 2009
    Date of Patent: August 28, 2018
    Assignee: SCHLUMBERGER TECHNOLOGY CORPORATION
    Inventors: Jim A. Grau, Markus Berheide, Christian Stoller, Brad Roscoe, James Thornton
  • Patent number: 9817152
    Abstract: A method of creating three-dimensional borehole data is provided, including illuminating a borehole using collimated beams of electromagnetic radiation; rotating the collimated beams in a sweep of at least 360 degrees; detecting backscattered electromagnetic radiation returned from surfaces of associated illumination planes using electromagnetic radiation sensors; converting detected radiation into a corresponding set of volume image data; analyzing the volume image data using computational visualization processing techniques; and creating a three-dimensional image representative of the volume data.
    Type: Grant
    Filed: March 9, 2016
    Date of Patent: November 14, 2017
    Assignee: VISURAY INTECH LTD (BVI)
    Inventors: Andrii Sofiienko, David Ponce, Ådne Voll, Philip Teague
  • Patent number: 9778384
    Abstract: A method of verifying the operational status of a neutron detecting device includes at least partially enclosing a neutron detecting device including a neutron detector in a container having outer walls comprising a thermal neutron absorber material, and determining an attenuated neutron count rate of the neutron detecting device. The method then includes removing the neutron detecting device from the container, exposing the neutron detecting device to neutron radiation originating from cosmic ray background, determining an operational neutron count rate of the neutron detecting device, determining a ratio between the operational neutron count rate and the attenuated neutron count rate, and verifying the operational status of the neutron detecting device if the operational neutron count rate is higher than the attenuated neutron count rate by at least a predetermined amount and the ratio is in a predetermined range.
    Type: Grant
    Filed: May 24, 2016
    Date of Patent: October 3, 2017
    Assignee: Thermo Fisher Scientific Messtechnik GmbH
    Inventors: Michael Iwatschenko-Borho, Reinhard Loew
  • Patent number: 9739899
    Abstract: A method of verifying the operational status of a neutron detecting device includes at least partially enclosing a neutron detecting device including a neutron detector in a container having outer walls comprising a thermal neutron absorber material, and determining an attenuated neutron count rate of the neutron detecting device. The method then includes removing the neutron detecting device from the container, exposing the neutron detecting device to neutron radiation originating from cosmic ray background, determining an operational neutron count rate of the neutron detecting device, determining a ratio between the operational neutron count rate and the attenuated neutron count rate, and verifying the operational status of the neutron detecting device if the operational neutron count rate is higher than the attenuated neutron count rate by at least a predetermined amount and the ratio is in a predetermined range.
    Type: Grant
    Filed: May 24, 2016
    Date of Patent: August 22, 2017
    Assignee: Thermo Fisher Scientific Messtechnik GmbH
    Inventors: Michael Iwatschenko-Borho, Reinhard Loew
  • Patent number: 9696454
    Abstract: A method of identifying barite in a subterranean annulus that surrounds a wellbore, where the method includes detecting gamma rays in the wellbore that are generated from the annulus, obtaining a count rate of the detected gamma rays, comparing the count rate with reference data, and determining the presence of barite in the wellbore based on the comparison. The count rate can be a ratio of counts of detected gamma rays obtained from spaced apart receivers on a downhole tool, or a ratio of detected inelastic and capture gamma rays. The reference data is obtained by using a simulation algorithm.
    Type: Grant
    Filed: January 6, 2016
    Date of Patent: July 4, 2017
    Assignee: Baker Hughes Incorporated
    Inventors: Sandeep Gade, Qiong Zhang, David Chace, Feyzi Inanc, Otto N. Fanini, Yonghwee Kim
  • Patent number: 9671518
    Abstract: A multi-source neutron logging tool has been developed. The multi-source logging tool comprises axially aligned gamma and thermal neutron detectors on either side of a multi-neutron source. The multi-source neutron logging tool may be used to evaluate formations adjacent a borehole.
    Type: Grant
    Filed: February 18, 2014
    Date of Patent: June 6, 2017
    Assignee: Roke Technologies Ltd.
    Inventor: Hermann Kramer
  • Patent number: 9599743
    Abstract: An apparatus for estimating a property of an earth formation and a borehole fluid includes a carrier configured to be disposed in a borehole, and a pulsed neutron measurement assembly including a pulsed neutron source configured to emit neutrons into the borehole and the earth formation, and a gamma ray detector. The apparatus also includes a fluid density measurement assembly including the gamma ray detector and a gamma ray source configured to irradiate a borehole fluid with gamma rays. The gamma ray detector is positioned relative to the gamma ray source to detect both of: gamma rays resulting from neutron interactions and gamma rays emitted from the borehole fluid in response to irradiation from the gamma ray source. The apparatus further includes a processor configured to differentiate a pulsed neutron gamma ray spectrum associated with the interactions from a density gamma ray spectrum.
    Type: Grant
    Filed: April 29, 2015
    Date of Patent: March 21, 2017
    Assignee: BAKER HUGHES INCORPORATED
    Inventors: Feyzi Inanc, David M. Chace, Maxim Vasilyev, Sandeep S. Gade, Steven M. Bliven
  • Patent number: 9464508
    Abstract: A tool activation system and method includes receiving an authorization code of a user to verify access rights of a user to activate the tool. In one example, the authorization code is receive from a smart card. The environment around the tool, which can be in a wellbore, for example, is checked. In response to the authorization code and the checking of the environment, activation of the tool is enabled.
    Type: Grant
    Filed: March 10, 2009
    Date of Patent: October 11, 2016
    Assignee: SCHLUMBERGER TECHNOLOGY CORPORATION
    Inventors: Nolan C. Lerche, James E. Brooks, Simon L. Farrant, Edward H. Rogers
  • Patent number: 9360585
    Abstract: A method for estimating a borehole independent porosity of a subterranean formation includes processing a neutron logging data point, preferably including average near and far detector neutron count rates with suitable input data to obtain the porosity estimate. The borehole independent formation porosity may be obtained without any compensation and without any reliance on the measurement or estimation of sensor standoff and/or borehole caliper.
    Type: Grant
    Filed: May 23, 2011
    Date of Patent: June 7, 2016
    Assignee: SCHLUMBERGER TECHNOLOGY CORPORATION
    Inventors: Libai Xu, Cornelis Huiszoon
  • Patent number: 9341737
    Abstract: An apparatus for estimating porosities of a formation includes: a borehole conveyable pulsed neutron generator to emit a pulse of high energy neutrons; a short spaced neutron detector to provide a count rate as a function of time; a long spaced neutron detector to provide a count rate as a function of time; a timing gate to synchronize a timing of neutrons detected by the detectors with respect to the neutron pulse; and a processor. The processor is configured to determine epithermal count rates and thermal count rates for the detectors based on timing of detection of neutrons with respect to the neutron pulse and calculate a first ratio of short to long spaced detector epithermal count rates and a second ratio of short to long spaced detector thermal count rates. The processor estimates an epithermal porosity using the first ratio and a thermal porosity using the second ratio.
    Type: Grant
    Filed: February 11, 2014
    Date of Patent: May 17, 2016
    Assignee: BAKER HUGHES INCORPORATED
    Inventors: Feyzi Inanc, Margarete M. Kopal, Loren Patrick Roberts
  • Patent number: 9310513
    Abstract: A method and apparatus for borehole logging, the method comprising collecting detector output data from a radiation detector of a borehole logging tool, and resolving individual signals in the detector output data by (i) determining a signal form of signals present in the data, (ii) making parameter estimates of one or more parameters of the signals, wherein the one or more parameters comprise at least a signal temporal position, and (iii) determining the energy of each of the signals from at least the signal form and the parameter estimates. The logging tool is shorter, logging tool speed is greater, dwell time is shorter and/or resolution is improved.
    Type: Grant
    Filed: March 31, 2009
    Date of Patent: April 12, 2016
    Assignee: Southern Innovation International Pty Ltd.
    Inventors: Paul Andrew Basil Scoullar, Robin John Evans, Christopher Charles McLean
  • Patent number: 9297909
    Abstract: A liquid scintillation counting system employs a guard detector efficiency compensation system to adjust sample event counts to compensate for a non-ideal guard which may not detect all cosmic and environmental gamma background noise events. The system and method determines counts of events detected coincidently by a guard detector subsystem and a sample detector subsystem in one or more energy regions as well as counts of events that are detected by the sample detector subsystem and not coincidently detected by the guard detector subsystem for the respective energy regions. The system and method calculates correction values for the respective energy regions based on the counts of coincident and non-coincident events and the guard efficiency values associated with the respective energy regions, using, for example, a quenched or unquenched sample. The system then applies the calculated correction values to counts for the respective energy regions, to produce corrected sample event counts.
    Type: Grant
    Filed: February 24, 2015
    Date of Patent: March 29, 2016
    Assignee: PERKINELMER HEALTH SCIENCES, INC.
    Inventor: Richard R. Harazin
  • Patent number: 9057795
    Abstract: Well logging method and logging tool for measuring cement density and thickness at different azimuth angles for a cemented, cased well. The method uses a gamma source, a short-spaced detector, a long-spaced detector, and preferably a backscatter detector, where the detector-to-source spacings are designed for calculating (93) thickness and density of the cement annulus (94) from the detector count rates (91).
    Type: Grant
    Filed: May 15, 2014
    Date of Patent: June 16, 2015
    Assignee: ExxonMobil Upstream Research Company
    Inventors: Pingjun Guo, Richard J. Smith, Thomas J. Boone
  • Patent number: 8952319
    Abstract: Downhole deployable tools for measuring tracer concentrations are disclosed. According to one embodiment, an apparatus comprises a support cable configured to allow the apparatus to be lowered into and raised from a wellbore. A housing is attached to the support cable. The housing includes a detector window on the exterior of the housing. A detector system within the housing includes a detector that measures tracer concentrations. The detector is operably connected to the detector window to direct energy or particles from the detector window to the detector.
    Type: Grant
    Filed: March 4, 2011
    Date of Patent: February 10, 2015
    Assignee: University of Utah Research Foundation
    Inventor: Peter E. Rose
  • Publication number: 20140175271
    Abstract: A disclosed system includes a light source and a nonlinear converter optically coupled to and remote from the light source. The nonlinear light converter converts a light pulse received from the light source to a broadened or spectrum-shifted light pulse. The system also includes a sensor in situ with the nonlinear light converter. The sensor performs a sense operation based on the broadened or spectrum-shifted light pulse and generates an electrical signal corresponding to the sense operation. The system also includes an electro-optical interface in situ with the sensor that transforms the electrical signal to an optical signal for conveyance to a signal collection interface A related method includes generating a light pulse and conveying the light pulse to a remote nonlinear light converter. The method also includes converting the light pulse to a broadened or spectrum-shifted light pulse.
    Type: Application
    Filed: December 22, 2012
    Publication date: June 26, 2014
    Applicant: Halliburton Energy Services, Inc.("HESI")
    Inventors: Etienne M. SAMSON, Tasneem A. Mandviwala, Robert P. Freese, David Perkins
  • Publication number: 20140166873
    Abstract: Cross-well electromagnetic (EM) imaging is performed using high-power pulsed magnetic field sources, time-domain signal acquisition, low-noise magnetic field sensors, spatial oversampling and super-resolution image enhancement and injected magnetic nanofluids. The acquired signals are processed and inter-well images are generated mapping electromagnetic (EM) signal speed (group velocity) rather than conductivity maps. EM velocity maps with improved resolution for both native and injected fluids are provided.
    Type: Application
    Filed: February 24, 2014
    Publication date: June 19, 2014
    Applicant: Saudi Arabian Oil Company
    Inventor: Howard K. Schmidt
  • Patent number: 8502135
    Abstract: A method for estimating a parameter of interest of an earth formation having a fluid contained in pores of the earth formation, the method includes: conveying a carrier through a borehole penetrating the earth formation; irradiating the earth formation with neutrons from a neutron source disposed at the carrier; measuring radiation emitted from the earth formation resulting from the irradiating using at least one detector; calculating or determining a mathematical parameter from radiation measured by the at least one detector; predicting values of the mathematical parameter over a range of values of an earth formation property; and comparing the mathematical parameter to the predicted values to estimate the parameter of interest.
    Type: Grant
    Filed: March 24, 2011
    Date of Patent: August 6, 2013
    Assignee: Baker Hughes Incorporated
    Inventors: David M. Chace, Rafay Z. Ansari, Feyzi Inanc, W. Allen Gilchrist, Jr., Elton Frost, Jr.
  • Publication number: 20130146756
    Abstract: Cross-well electromagnetic (EM) imaging is performed using high-power pulsed magnetic field sources, time-domain signal acquisition, low-noise magnetic field sensors, spatial oversampling and super-resolution image enhancement and injected magnetic nanofluids. Inter-well images are generated mapping electromagnetic (EM) signal speed (group velocity) rather than conductivity maps. EM velocity maps with improved resolution for both native and injected fluids are provided.
    Type: Application
    Filed: December 7, 2012
    Publication date: June 13, 2013
    Applicant: Saudi Arabian Oil Company
    Inventor: Saudi Arabian Oil Company
  • Patent number: 8436295
    Abstract: The present invention provides a device for measuring a mean free path capable of measuring directly the mean free path of a charged particle, a vacuum gauge, and a method for measuring a mean free path. The device for measuring a mean free path according to one embodiment of the invention includes an ion source for generating an ion, a collector (24a) for detecting the number of first charged particles being charged particles having a first flight distance L1 that is a flight distance of zero or more from the ion source, and a collector (24b) for detecting the number of second charged particles having a second flight distance longer than the first flight distance. The control part of the device calculates the mean free path from a ratio between the numbers of the first and second charged particles.
    Type: Grant
    Filed: March 15, 2012
    Date of Patent: May 7, 2013
    Assignee: Canon Anelva Corporation
    Inventors: Yoshiro Shiokawa, Megumi Nakamura, Qiang Peng
  • Patent number: 8082103
    Abstract: Hourly CO2 concentration, amount of solar radiation, and plant distribution information are calculated through observation from predetermined satellites. A concentration of CO2 absorbed by plant-chlorophyll per each time unit is calculated. By adding up the CO2 concentration on the earth and the concentration of CO2 absorbed by the plant-chlorophyll, a CO2 concentration obtained provided that no plant-chlorophyll exist is calculated for a certain period. Thereafter, a mean concentration of CO2 that is absorbed according to changes in the distribution of plant-chlorophyll is calculated on the basis of a monthly mean solar radiation amount and plant-chlorophyll distribution information. By subtracting the CO2 concentration, which is a mean, from the total CO2 concentration, a CO2 concentration, which is a normal, is calculated.
    Type: Grant
    Filed: July 15, 2010
    Date of Patent: December 20, 2011
    Assignee: Fujitsu Limited
    Inventor: Shuichi Tanahashi
  • Publication number: 20110272569
    Abstract: Various systems and methods for implementing a directional radiation detection tool are disclosed. One such method involves receiving outputs from several radiation sensors (e.g., gamma ray sensors), which are each facing a different direction. The received outputs are then combined, such that a directional error in one of the outputs is reduced, based upon another one of the outputs.
    Type: Application
    Filed: May 7, 2011
    Publication date: November 10, 2011
    Inventors: Paul L. Sinclair, Christopher A. Schnoor
  • Publication number: 20110260044
    Abstract: Systems and methods for neutron porosity well logging with high precision and reduced lithology effects are provided. In accordance with an embodiment, a downhole neutron porosity tool may include a neutron source, a neutron monitor, a neutron detector, and data processing circuitry. The neutron source may emit neutrons into a subterranean formation while the neutron monitor detects a count of neutrons proportional to the neutrons emitted. The neutron detector may detect a count of neutrons that scatters off the subterranean formation. The data processing circuitry may determine an environmentally corrected porosity of the subterranean formation based at least in part on the count rate of neutrons scattered off the subterranean formation normalized to the count rate of neutrons proportional to the neutrons emitted by the neutron source.
    Type: Application
    Filed: April 21, 2010
    Publication date: October 27, 2011
    Inventors: Peter Wraight, James Thornton, Bradley A. Roscoe
  • Publication number: 20110238313
    Abstract: Systems, methods, and devices for determining a porosity of a subterranean formation corrected for borehole effects are provided. One such device may be a downhole tool capable of being lowered into a borehole of a subterranean formation that may include a neutron source, two or more neutron detectors, and data processing circuitry. The neutron source may emit neutrons into the subterranean formation. The two or more neutron detectors may be respectively disposed at two or more azimuthal orientations within the downhole tool, and may detect neutrons scattered by the subterranean formation or borehole fluid in the borehole, or both. Based on the neutrons detected by the neutron detectors, the data processing circuitry may determine a porosity of the subterranean formation corrected for borehole effects.
    Type: Application
    Filed: March 23, 2010
    Publication date: September 29, 2011
    Inventors: James Thornton, Bradley A. Roscoe
  • Patent number: 7903782
    Abstract: An apparatus for determining fractional amounts of each phase of a multiple phase fluid includes an x-ray generator includes a sample chamber is configured to admit therein a sample of fluid for analysis. The chamber is disposed in a radiation path output from the generator. A filter is disposed in the radiation path between the output of the generator and the radiation input of the sample chamber. A first radiation detector is positioned in a radiation path from the sample chamber after radiation has passed through the sample chamber. A thickness and a material of the filter are selected to optimize resolution of radiation detected by the first detector to changes in volume fraction of oil and water in the fluid sample when a gas fraction thereof is between about 90 to 100 percent.
    Type: Grant
    Filed: December 19, 2007
    Date of Patent: March 8, 2011
    Assignee: Schlumberger Technology Corporation
    Inventors: Joel L. Groves, Etienne Vallee, Peter Wraight
  • Publication number: 20110001040
    Abstract: Methods for determining the locations/heights of fractures in a subterranean formation use a post-fracture log obtained with a compensated neutron or pulsed neutron logging tool. Utilizing predetermined relationships between tool count rates and associated near/far count rate ratios, the methods detect the presence of proppant containing high thermal neutron capture cross-section material, substantially eliminating proppant determination uncertainty resulting from changes in formation hydrogen index. In an interval of a well with given borehole and formation conditions, and not containing proppant, a relationship is developed between detector count rate and near/far ratio. This relationship is used to compute count rate from the ratio in intervals of the well possibly containing proppant and which have similar formation and borehole conditions.
    Type: Application
    Filed: June 22, 2010
    Publication date: January 6, 2011
    Applicant: CARBO CERAMICS INC.
    Inventors: Harry D. Smith, JR., Michael P. Smith, Robert Duenckel
  • Patent number: 7809508
    Abstract: A method for conducting density measurements in downhole environments corrects for high standoff, by adding a second correction term to the spine and rib method. This second term is a correction based on an apparent standoff estimated using the photo electric effect of the mud. This correction is term depends on the mud properties, both in terms of apparent standoff and correction and therefore requires property calibration for each well. The calibration can be done using the azimuthal information available with LWD tool when the tool is turning. At each depth in homogeneous formation, there can be a succession of density measurements with various tool standoff when the tool is not centered in the borehole. All this information is used to build up a standoff correction fitting perfectly the mud properties.
    Type: Grant
    Filed: June 18, 2007
    Date of Patent: October 5, 2010
    Assignee: Schlumberger Technology Corporation
    Inventor: Olivier Desport
  • Patent number: 7723675
    Abstract: 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 neutron moderator and having a sample cavity for inserting a sample of nuclear material therein; and an annular He-3 detector tube including at least one annular gas layer into which at least He-4 or He-3 gas or their mixture is injected and a plurality of anode rods stood in the annular gas layer with an equal spaces, wherein the He-3 detector tube is formed in an inside of the body so as to surround the sample cavity. The neutron counter has a largely reduced size, simplified structure and resultant decreased failure rate as compared to a conventional counter with a large volume.
    Type: Grant
    Filed: May 21, 2008
    Date of Patent: May 25, 2010
    Assignee: Korea Atomic Energy Research Institute
    Inventors: Hee Sung Shin, Myung Kook Moon, Tae Hoon Lee, Kwang Jun Park, June Sik Joo, Jung Hwan Jung, Ho Dong Kim, Ji Sup Yoon
  • Patent number: 7482579
    Abstract: 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 detectors; measuring the radiation with the detectors; and combining a response from at least two of the detectors to produce a composite response exhibiting a spatial resolution.
    Type: Grant
    Filed: March 15, 2007
    Date of Patent: January 27, 2009
    Assignee: Baker Hughes Incorporated
    Inventor: W. Allen Gilchrist, Jr.
  • Patent number: 7279677
    Abstract: 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 component. A well logging instrument having a gamma ray source and energy-sensitive gamma ray detectors rotates within the wellbore to define a transient interface with a facing portion of the wellbore wall. The instrument measures Compton-effect gamma ray scattering and photoelectric-effect gamma ray scattering of gamma rays that cross a first interface, and of later gamma rays that cross an opposite interface, at each of a plurality of locations along the wellbore to produce a group of gamma ray counts at each of a series of wellbore locations. The counts are used to determine standoffs, weight fraction, and wellbore diameter.
    Type: Grant
    Filed: August 22, 2005
    Date of Patent: October 9, 2007
    Assignee: Schlumberger Technology Corporation
    Inventors: Darwin V. Ellis, Charles Fulton, Dhanoolal Kandhai
  • Patent number: 7159672
    Abstract: 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 electromagnetic field detector which is configured for measuring the locating signal from a fixed position proximate to the surface of the ground in a drilling area. The mapping tool includes a housing and a transmitter arrangement supported by the housing for transmitting a setup locating signal for reception by the detector in the region for use in determining certain initial conditions at least prior to drilling. The associated methods include the step of configuring the mapping tool for transmitting a setup locating signal for reception by the detector in the region and using the received setup locating signal in determining certain initial conditions at least prior to drilling.
    Type: Grant
    Filed: June 7, 2006
    Date of Patent: January 9, 2007
    Assignee: Merlin Technology, Inc.
    Inventors: John E. Mercer, Peter H. Hambling, Rudolf Zeller, Shiu S. Ng, Guenter W. Brune, Lloyd A. Moore
  • Patent number: 7129477
    Abstract: 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 acoustic caliper is used for making standoff measurements of the NaI detectors. Measurements made by the detectors are partitioned into standoff bins. An adaptive spine and rib method uses the standoff measurements to obtain density estimates. The method of the invention may also be used with neutron porosity logging devices.
    Type: Grant
    Filed: March 27, 2003
    Date of Patent: October 31, 2006
    Assignee: Baker Hughes Incorporated
    Inventors: David M. Schneider, Sergey V. Efremov, Matthew J. Sale
  • Patent number: 7099503
    Abstract: 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 pixel point g(x, y) enters is selected based on the distance ?z from a scan center plane to an image reconstruction plane in a z-axis direction and the position (x, y) of the pixel point g in the image reconstruction plane, and data of the j-th detector row is used to determine the pixel value of the pixel point g, where the scan center plane at a certain view angle is defined as an x-y plane, and a direction normal to the x-y plane, i.e., a detector row direction, is defined as the z-axis direction.
    Type: Grant
    Filed: September 16, 2002
    Date of Patent: August 29, 2006
    Assignee: GE Medical Systems Global Technology LLC
    Inventor: Akihiko Nishide
  • Patent number: 7085405
    Abstract: 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 with the event determined from the acquired data; and iteratively reconstructing the image based on the individually reprojected data.
    Type: Grant
    Filed: April 17, 1997
    Date of Patent: August 1, 2006
    Assignee: GE Medical Systems Israel, Ltd.
    Inventors: Ron Levkovitz, Michael Zibulevsky, Dimitry Falikman, Gideon Berlad
  • Patent number: 7080698
    Abstract: 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 electromagnetic field detector which is configured for measuring the locating signal from a fixed position proximate to the surface of the ground in a drilling area. The mapping tool includes a housing and a transmitter arrangement supported by the housing for transmitting a setup locating signal for reception by the detector in the region for use in determining certain initial conditions at least prior to drilling. The associated methods include the step of configuring the mapping tool for transmitting a setup locating signal for reception by the detector in the region and using the received setup locating signal in determining certain initial conditions at least prior to drilling.
    Type: Grant
    Filed: June 24, 2005
    Date of Patent: July 25, 2006
    Assignee: Merlin Technology, Inc.
    Inventors: John E. Mercer, Peter H. Hambling, Rudolf Zeller, Shiu S. Ng, Guenter W. Brune, Lloyd A. Moore
  • Patent number: 6920943
    Abstract: 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 electromagnetic field detector which is configured for measuring the locating signal from a fixed position proximate to the surface of the ground in a drilling area. The mapping tool includes a housing and a transmitter arrangement supported by the housing for transmitting a setup locating signal for reception by the detector in the region for use in determining certain initial conditions at least prior to drilling. The associated methods include the step of configuring the mapping tool for transmitting a setup locating signal for reception by the detector in the region and using the received setup locating signal in determining certain initial conditions at least prior to drilling.
    Type: Grant
    Filed: September 4, 2003
    Date of Patent: July 26, 2005
    Assignee: Merlin Technology, Inc.
    Inventors: John E. Mercer, Peter H. Hambling, Rudolf Zeller, Shiu S. Ng, Guenter W. Brune, Lloyd A. Moore
  • Patent number: 6918293
    Abstract: 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, and a far detector count rate; b) determining a formation density measurement using near and far detector count rates when the standoff distance is less than a predetermined value; and c) determining the formation density measurement using just the far detector count rate and the standoff distance measurement when the standoff distance is greater than the predetermined value. The method may further include calculating a calibration parameter when the standoff distance is less than the predetermined value. The calibration parameter serves to calibrate a standoff-based correction to the far detector count rate, enabling accurate formation density measurements at large standoff distances. The measurements are made with a rotating logging tool, causing the standoff distance to cycle between large and small values.
    Type: Grant
    Filed: April 9, 2003
    Date of Patent: July 19, 2005
    Assignee: Halliburton Energy Services, Inc.
    Inventors: Gordon L. Moake, Jerome A. Truax
  • Patent number: 6732059
    Abstract: 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 features in preamplifier pulses generated by collecting the charges in ionization tracks produced by alpha particles emanating from different regions within the counter and then using pulse feature analysis to recognize these differences and so discriminate between different regions of emanation. Thus alpha particles emitted from the sample can then be counted while those emitted from the counter components can be rejected, resulting in very low background counting rates even from large samples. In one embodiment, a multi-wire ionization chamber, different electric fields are created in different regions of the counter and the resultant difference in electron velocities during charge collection allow alpha particles from the sample and counter backwall to be distinguished.
    Type: Grant
    Filed: August 23, 2001
    Date of Patent: May 4, 2004
    Inventors: William K. Warburton, John Wahl, Michael Momayezi
  • Patent number: 6696362
    Abstract: 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 time that spans multiple distinct processing steps in the recipe. The time dependence of in situ particle levels is determined from these results. Then, the processing steps are correlated with the time dependence to identify relative particle levels with the processing steps. This information provides a direct indication of which steps result in the production of particle contaminants so that those steps may be targeted for modification in the development of particle recipes.
    Type: Grant
    Filed: April 12, 2002
    Date of Patent: February 24, 2004
    Assignee: Applied Materials Inc.
    Inventors: Kent Rossman, Leonard Jay Olmer, Phillip Nguyen
  • Patent number: 6457537
    Abstract: 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 electromagnetic field detector which is configured for measuring the locating signal from a fixed position proximate to the surface of the ground in a drilling area. The mapping tool includes a housing and a transmitter arrangement supported by the housing for transmitting a setup locating signal for reception by the detector in the region for use in determining certain initial conditions at least prior to drilling. The associated mathods include the step of configuring the mapping tool for transmitting a setup locating signal for reception by the detector in the region and using the received setup locating signal in determining certain initial conditions at least prior to drilling.
    Type: Grant
    Filed: December 13, 2001
    Date of Patent: October 1, 2002
    Assignee: Digital Control Incorporated
    Inventors: John E. Mercer, Peter H. Hambling, Rudolf Zeller, Shiu S. Ng, Guenter W. Brune, Lloyd A. Moore
  • Patent number: 6364035
    Abstract: Specific apparatus and associated methods are described for use in establishing the positions of locating field detectors and for path mapping within a region for the purpose of tracking and/or guiding the movement of an underground boring tool. In one aspect, an improvement is provided forming part of an arrangement for tracking the position and/or guiding the boring tool using an electromagnetic locating signal which is transmitted from the boring tool as the boring tool moves through the ground. At least two detectors are located at fixed positions within the region, each being operable in a transmit mode and in a receive mode such that each one of the detectors in the transmit mode is able to transmit a relative locating signal to the other detector for use in determining the relative position of one detector in relation to the other and such that both detectors receive the electromagnetic locating signal in the receive mode for use in determining the position of the boring tool within the region.
    Type: Grant
    Filed: April 30, 2001
    Date of Patent: April 2, 2002
    Assignee: Digital Control Incorporated
    Inventors: Guenter W. Brune, Peter H. Hambling, John E. Mercer, Lloyd A. Moore, Shiu S. Ng, Rudolf Zeller