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| Number | Title | Issue Date |
| 8101907 | Methods for quantitative lithological and mineralogical evaluation of subsurface formations Methods, systems, apparatus and processes for determining the lithology as well as the mineralogy of subterranean formations surrounding a borehole are described. According to the methods and processes, well log data measurements from neutron spectroscopy applicatio... | 01/24/2012 |
| 7767958 | Nanograss gamma detector A gamma-ray detector comprising: a housing having a window through which gamma rays can enter; the housing comprising; a two-dimensional array of electrically conducting carbon nanotubes, which act as a cathode, on... | 08/03/2010 |
| 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 neutron moderator and having a sample cavity for inserting a sample o... | 05/25/2010 |
| 7642507 | Apparatus and methods for interlaced density and neutron measurements A tool for formation logging includes a support configured for movement in a borehole; a source mounted on the support, the source configured to emit neutrons and gamma rays; and at least one sensor mounted on the support and spaced apart from the source, wherein th... | 01/05/2010 |
| 7538318 | Condensation-induced gamma radiation as a method for the identification of condensable vapor In methods according to the invention, subsurface formations below the surface of the earth are detected by introducing a condensable material in vapor form into the subsurface formation, measuring radiation of the condensable material, increasing the concentration ... | 05/26/2009 |
| 7498567 | Optical wellbore fluid characteristic sensor Evanescent waveguide sensors for measuring and determining the composition of wellbore fluids in situ are provided. The waveguides are provided on substrates have a thickness and strength sufficient to withstand wellbore pressures and a sufficient surface area to al... | 03/03/2009 |
| 7485851 | Compound optical coupler and support mechanism A support mechanism for protecting an object is described. The support system includes at least one support or friction ring for providing dynamic protection to the object. One embodiment includes a support ring having corrugated bumps. Another embodiment includes m... | 02/03/2009 |
| 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 |
| 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 magnetometer on the drill collar measures the relative azimuth of the ... | 10/07/2008 |
| 7424367 | Method for predicting lithology and porosity from seismic reflection data Method for predicting lithology and porosity of subsurface rocks from seismic reflection data. The seismic data is inverted to yield elastic properties of the rocks such as the compressional and shear impedances. A rock physics model is built to relate porosity, the... | 09/09/2008 |
| 7408645 | Method and apparatus for a downhole spectrometer based on tunable optical filters Thermally tunable optical sensors are used in sampling tools for analysis of samples from a wellbore. The thermally tunable optical sensors generate a series passbands of wavelength emissions and detect attenuation in a signal thereof. The attenuation detected is pr... | 08/05/2008 |
| 7362422 | Method and apparatus for a downhole spectrometer based on electronically tunable optical filters The present invention provides an apparatus and method for high resolution spectroscopy (approximately 10 picometer wavelength resolution) using a tunable optical filter (TOF) for analyzing a formation fluid sample downhole and at the surface to determine formation ... | 04/22/2008 |
| 7357021 | Methods of monitoring downhole conditions Methods of monitoring various downhole conditions are described, including a system for determining and/or identifying the flow of fluid in a well, determining sand production in a well, identifying localized events in a well, determining the apparent flow velocity ... | 04/15/2008 |
| 7335891 | Gamma and neutron radiation detector A sensing element or detector activated by radiation comprising a first scintillator activated by gamma radiation; and a neutron sensing layer comprising a second scintillator activated by neutron radiation. ... | 02/26/2008 |
| 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 properties of the well casing. The corrected density log is then combin... | 02/05/2008 |
| 7321123 | Method and apparatus for radiation detection in a high temperature environment A radiation detector operating at high temperatures is shown comprising a LuAP scintillating material for producing light when excited by incident radiation, a photocathode, and an electron multiplier. The photocathode is deposited directly onto the surface of the s... | 01/22/2008 |
| 7287585 | Methods of quantifying gas content of a gas-sorbed formation solid The evaluation and assessment of geologic formations comprising undersaturated methane reservoirs. In some embodiments, the present invention provides for inductively quantifying critical desorption pressure of the solid in an undersaturated methane reservoir from a... | 10/30/2007 |
| 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 |
| 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 component. A well logging instrument having a gamma ray source and energy-sen... | 10/09/2007 |
| 7277795 | Method for estimating pore structure of porous materials and its application to determining physical properties of the materials A method is disclosed for modeling a pore structure of a porous material. The method includes generating an initial model of the porous material. The initial model includes an interconnected network of passages including a first geometric shape and a second geometri... | 10/02/2007 |
| 7276715 | Method and apparatus for safely handling radioactive sources A system for handling a radioactive source includes a container containing a radioactive source and a cap mounted on the container to retain the radioactive source inside the container. The cap has a first locking structure and a second locking structure. The system... | 10/02/2007 |
| 7266178 | Calibration source for X-ray detectors A method and device for calibrating the energy response of detectors of photons in the range from about 0.5 keV to at least 100 keV. The device makes use of the inherent property of a polarizable crystal such as a pyroelectric crystal to produce monoenergetic x-rays... | 09/04/2007 |
| 7253402 | Apparatus and method for determining thermal neutron capture cross section of a subsurface formation from a borehole using multiple detectors A well logging instrument including a plurality of detectors having different precisions and accuracies, the more precise detectors generally having lower accuracies. The detectors are responsive to the interaction of radiation from a suitable source on the instrume... | 08/07/2007 |
| 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 |
| 7254486 | Method and apparatus for shale bed detection in deviated and horizontal wellbores A relative dip angle of a deviated borehole is determined from natural gamma ray measurements. Dip corrected measurements are processed to determine the thickness of thin beds, and the peak gamma ray response in thin beds. ... | 08/07/2007 |
| 7251565 | Determining fluid composition from fluid properties A method for determining the composition of a fluid by using measured properties of the fluid. One embodiment of the method of the current invention generally comprises: selecting a fluid property that has a response to fluid composition that is linear, or can be ap... | 07/31/2007 |
| 7250606 | Buried object evaluating method, underground resources evaluating method, underground waste evaluating method, underground preserved object evaluating method, stratum structure evaluating method and building interior monitoring method, all using hard X-rays or γ-rays As a method for using a hard X-ray sensor that can detect weak hard X-rays or the like with a higher resolution, a method for accurately evaluating natural resources of crude oil, natural gas, etc. existing underground, for example, is provided. A buried object eval... | 07/31/2007 |
| 7246661 | Methods of quantifying gas content of a gas-sorbed formation solid The evaluation and assessment of geologic formations comprising undersaturated methane reservoirs. In some embodiments, the present invention provides for inductively quantifying critical desorption pressure of the solid in an undersaturated methane reservoir from a... | 07/24/2007 |
| 7224162 | System and methods for upscaling petrophysical data System and methods for estimating properties of a geologic formation are disclosed. A preferred embodiment includes a method for estimating properties of a geologic formation, comprising the steps of: measuring a property of the formation in two or more directions a... | 05/29/2007 |
| 7219729 | Permanent downhole deployment of optical sensors The present invention involves methods and apparatus for permanent downhole deployment of optical sensors. Specifically, optical sensors may be permanently deployed within a wellbore using a casing string. In one aspect, one or more optical sensors are disposed on, ... | 05/22/2007 |
| 7216702 | Methods of evaluating undersaturated coalbed methane reservoirs The evaluation and assessment of geologic formations comprising undersaturated coalbed methane reservoirs. In some embodiments, the present invention provides for inductively quantifying critical desorption pressure of the solid in an undersaturated coalbed methane ... | 05/15/2007 |
| 7217917 | Natural gamma ray logging sub method and apparatus A natural gamma tag marking materials for sub or permanent markers used in gamma logging operations, such natural gamma materials having a gamma count of between 200 and 1000 counts per second. The instant invention further discloses a typical Sub, for insertion in ... | 05/15/2007 |
| 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 |
| 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 tube, and a photon detector arranged to receive photons which have pass... | 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 |
| 7201221 | Wellbores utilizing fiber optic-based sensors and operating devices This invention provides a method for controlling production operations using fiber optic devices. An optical fiber carrying fiber-optic sensors is deployed downhole to provide information about downhole conditions. Parameters related to the chemicals being used for ... | 04/10/2007 |
| 7173239 | Method and apparatus for downhole quantification of methane using near infrared spectroscopy The present invention describes a unique method and apparatus for applying near-infrared spectroscopy to estimate weight percent of methane in crude oil from which one can then infer gas-oil ratio (GOR) of crude oils downhole in real time while collecting a fluid sa... | 02/06/2007 |
| 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 |
| 7161153 | Apparatus and method for detecting α-ray An α-ray measuring apparatus is provided for accurately analyzing the energy of a trace of α-rays emitted from a sample in a short time using semiconductor detectors which excel in energy resolution. The α-ray measuring apparatus comprises an α-ray detector incl... | 01/09/2007 |
| 7158813 | Antenna for wireless systems A base station for a wireless communication system has an antenna system that provides a downstream transmit pattern partitioned into azimuthal sectors and an upstream receive pattern partitioned into azimuthal sectors and elevation sectors. The base station has a t... | 01/02/2007 |
