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| Number | Title | Issue Date |
| 7439494 | 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... | 10/21/2008 |
| 7408150 | Well logging method for determining formation characteristics using pulsed neutron capture measurements A method for determining thermal capture cross-sections of formations surrounding an earth borehole, including the following steps: providing a logging device that is moveable through the borehole; transmitting, from the logging device, bursts of neutrons into the f... | 08/05/2008 |
| 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 |
| 7337660 | Method and system for reservoir characterization in connection with drilling operations A method for analyzing reservoir fluids in connection with a drilling operation includes determining composition and isotopes of injection fluids injected into a wellbore during a drilling operation and production fluids recovered from the wellbore during the drilli... | 03/04/2008 |
| 7285772 | Logging tool with a parasitic radiation shield and method of logging with such a tool It is described a logging tool 20 for underground formations surrounding a borehole 14, comprising an elongated body 21 along a major axis; a collar 22 disposed peripherally around said body 21 having a collar wall defined by an in... | 10/23/2007 |
| 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 invasion is minimal. Using a Monte-Carlo method, a relationship is es... | 10/16/2007 |
| 7272585 | Operation circuit and operation control method thereof A product-sum operation circuit includes a pulse width/digital conversion circuit (9) which converts a pulse signal having a pulse width representing an operand value into a digital signal, a sorting circuit (4) which outputs, in descending or ascendin... | 09/18/2007 |
| 7139350 | Method and apparatus for measuring radiation in a borehole Apparatus and methods for measuring radiation in a borehole environment using a YAlO3:Ce (YAP) scintillation crystal. Borehole instruments are disclosed which employ a gamma ray detector comprising a YAP scintillator coupled to a light sensing means such ... | 11/21/2006 |
| 6901337 | Method and apparatus for measuring signal pulse energy The energy E of a signal pulse P inputted to an energy measurement apparatus 1 for measurement, and corresponding to the total integrated intensity, is calculated in an energy calculation unit 10 from the integrated signal intensity Q acquired by a gat... | 05/31/2005 |
| 6665616 | Method for determining decay characteristics of multi-component downhole decay data Measurements from many logging instruments such as Gamma ray counts from a pulsed neutron instrument, typically have a spectrum that contains a plurality of exponentially decaying components. The slowest decaying component is obtained by fitting a single ... | 12/16/2003 |
| 6566649 | 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. Detector responses for one or more downhole detectors are sample... | 05/20/2003 |
| 6207953 | Apparatus and methods for determining gas saturation and porosity of a formation penetrated by a gas filled or liquid filled borehole Methods and apparatus are disclosed for determining gas saturation, liquid saturation, porosity and density of earth formations penetrated by a well borehole. Determinations are made from measures of fast neutron and inelastic scatter gamma radiation indu... | 03/27/2001 |
| 5973321 | Method for determining multiple thermal neutron decay components from the capture gamma ray spectrum measured by a pulsed neutron instrument A method for determining the fractional amounts of, and the thermal neutron capture cross-sections of, individual components which are included in the decay spectrum measured by a pulsed neutron well logging instrument. The instrument includes a pulsed hi... | 10/26/1999 |
| 5949069 | Method and apparatus for measuring volumetric water flow rates in highly inclined wellbores A method for determining a volume fraction of water moving in a predetermined direction along a highly inclined conduit. The method includes measuring a fractional volume of water occupying the conduit at a plurality of locations along the conduit. An oxy... | 09/07/1999 |
| 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 irradiating the formation with bursts of high energy neutrons fro... | 07/02/1996 |
| 5473158 | Logging while drilling method and apparatus for measuring formation characteristics as a function of angular position within a borehole A method and apparatus for measuring formation characteristics as a function of angular distance segments about the borehole is disclosed. The measurement apparatus includes a logging while drilling tool which turns in the borehole while drilling. Such ch... | 12/05/1995 |
| 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 short space radiation detector. The counts are detected dur... | 09/19/1995 |
| 5440118 | Methods and apparatus for determining formation lithology by gamma ray spectroscopy Inelastic scattering gamma ray spectra taken in a borehole are analyzed by a least squares spectral fitting process to determine the relative elemental contributions thereto of chemical elements postulated to be present in unknown earth formations and con... | 08/08/1995 |
| 5434408 | Induced gamma ray spectroscopy well logging system A system for use in cased well boreholes for measuring gamma ray spectra induced by bombardment of earth formations in the vicinity of the borehole with fast neutrons. Monoenergetic fast neutrons emitted in repetitive pulses penetrate the borehole structu... | 07/18/1995 |
| 5406078 | Induced gamma ray spectorscopy well logging system A system for measuring fast neutron induced gamma ray energy spectra in cased wellbores. The system includes an electronic source of monoenergetic 14 MeV fast neutrons, a high density bismuth germanate scintillation detector, a downhole pulse height analy... | 04/11/1995 |
| 5081351 | Method and apparatus for borehole correction in capture gamma ray spectroscopy measurements A method and an apparatus for correcting nuclear measurements performed in a borehole traversing earth formation, for the effect of said borehole, wherein the formation is irradiated with high energy neutrons source and the gamma rays resulting from the c... | 01/14/1992 |
| 4788424 | Method and apparatus for determining partitioning of borehole and formation constituents Methods and apparatus are disclosed for producing an indication of the partition between a borehole and a formation of the constituents identified by means of a nuclear investigation. A borehole logging sonde containing a pulsed neutron source and a gamma... | 11/29/1988 |
| 4749859 | Nuclear well logging data acquistion system and method A computer-based system and method for acquisition of nuclear well logging data, including downhole generation of energy and time spectral information. For acquiring energy spectrum data, a downhole multi-parameter analyzer is provided including a pulse h... | 06/07/1988 |
| 4746801 | Method and apparatus for differentiating low porosity limestones from high porosity gas sands By taking the ratio of silicon to calcium pulsed neutron capture gamma radiations together with a formation capture cross section measurement, in formations (20) having low hydrogen index, a measurement indicator is provided for differentiating low porosi... | 05/24/1988 |
| 4721853 | 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 burst, long burst repetitive sequence. After a short delay fr... | 01/26/1988 |
| 4712007 | Pulsed neutron logging method using cumulative count curves A method of measuring earth formation characteristics using a pulsed neutron source computes the characteristics by using a cumulative count curve. A pulsed neutron source and detector are pulled upwardly through a borehole. The pulsed neutron source repe... | 12/08/1987 |
| 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 interval between source firings, such spectra including the... | 09/29/1987 |
| 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 introducing high energy neutrons into the formation at prescribe... | 05/26/1987 |
| 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 interval between source firings, such spectra including the... | 04/07/1987 |
| 4645926 | 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 interval between source firings, such spectra including the... | 02/24/1987 |
| 4625111 | Method and apparatus for pulsed neutron capture measurement of borehole conditions and formation hydrogen index A method is disclosed for the simultaneous determination of borehole (11) and earth formation (20) thermal neutron decay time components. The method, which employs pulsed high energy neutron sources (21) and time gated detectors (23,24), furnishes several... | 11/25/1986 |
| 4600838 | Methods and apparatus for measuring thermal neutron decay characteristics of earth formations Methods for measuring thermal neutron decay characteristics of earth formations include the steps of irradiating an earth formation with a discrete burst of fast neutrons, detecting indications of thermal neutron concentration in the formation during a se... | 07/15/1986 |
| 4596927 | Method and apparatus for induced gamma ray logging In a neutron induced gamma ray well logging instrument, a neutron generator is pulsed at a preselected clock frequency. Each neutron burst produces inelastic scattering gamma rays and capture gamma rays. Inelastic scattering gamma rays are detected using ... | 06/24/1986 |
| 4507554 | Method and apparatus for determining borehole and formation constituents A method and apparatus for determining the contents of a borehole traversing a subterranean formation is provided. In the method, a well-logging sonde is used to bombard the contents of a borehole and the formation with fast neutrons. An early capture spe... | 03/26/1985 |
| 4501964 | Borehole compensated oxygen activation nuclear well logging Formations adjacent a well borehole are activated with neutrons from a pulsed neutron source in a sonde at an energy level, such as 14 MeV, to energize oxygen present in the formation and borehole, giving rise to gamma radiation from O16 (n,p)N... | 02/26/1985 |
| 4454420 | Neutron-inelastic gamma radiation well logging method and apparatus with background radiation accounted for Methods and apparatus are provided for making improved pulsed neutron derived measurements of the carbon: oxygen ratio in subsurface earth formations. Plural radiation measurements are made as a function of time from the initiation of the neutron pulse to... | 06/12/1984 |
| 4446369 | Method and system for radioactive assaying A subsurface formation is irradiated with pulsed neutrons and both inelastic scattering and capture gamma-rays are measured in energy level bands characteristic of sulfur and iron. Differentials are determined between such inelastic scattering and capture... | 05/01/1984 |
| 4424444 | Method for simultaneous measurement of borehole and formation neutron lifetimes The present invention concerns methods for measuring simultaneously the formation and borehole components of thermal neutron lifetime as decay time. The borehole and formation are irradiated with pulsed 14 MEV neutrons. During the interval between neutron... | 01/03/1984 |
| 4409481 | Method for simultaneous measurement of thermal neutron decay components A method is disclosed for simultaneous determination of borehole and formation thermal neutron decay time components. The methods employ pulsed high energy neutron sources and time gated dual spaced detectors. Exponential decay curves are assumed for each... | 10/11/1983 |
| 4390783 | Spectroscopic analysis with background compensation The composition of an earth formation is investigated by repetitively irradiating the formation with bursts of incident radiation and generating an unknown energy spectrum from radiation resulting from the interaction of the incident radiation with nuclei... | 06/28/1983 |
