| Class / Patent application number | Description | Number of patent applications / Date published |
|---|
| 250269200 | With plural types of detectors | 10 |
| 20110012015 | Apparatus and Methods for Measuring Formation Characteristics - An apparatus can measure characteristics of a formation surrounding a borehole. The apparatus comprises a tool body including a neutron measurement section including a neutron source and a neutron detector arrangement spaced in an axial direction from the neutron source; and | 01-20-2011 |
| 20110168879 | Nuclear Tool - A nuclear measurement tool for determining properties of a formation penetrated by a borehole fluid. The tool comprising: a nuclear source for irradiating the formation and a a plurality of nuclear sensors each operating with a different depth of investigation into the formation. The tool further comprising processing means for receiving the data from the nuclear sensors and based thereon determining the properties of the formation by taking into account the penetration of the borehole fluid. | 07-14-2011 |
| 20130299687 | Neutron Wellbore Imaging Tool - A method and apparatus for obtaining neutron images of a rock formation are provided. The neutron images can be obtained from a tool which need not rotate to obtain neutron data from a plurality of azimuthal orientations. | 11-14-2013 |
| 20130327933 | Method For Measuring Subterranean Formation Density Using A Neutron Generator - A method for determining a bulk formation density using a neutron generator includes detected secondary gamma rays and evaluating the detected gamma rays according to pre-determined selection criteria. Selected gamma rays are then used to compute the formation density. The selection criteria may include, for example, a time delay between the detection of a neutron and an associated particle and/or a direction of propagation of the neutron. | 12-12-2013 |
| 20140332678 | Neutron-Gamma Density Through Normalized Inelastic Ratio - Systems, methods, and devices for determining neutron-gamma density (NGD) measurement of a subterranean formation that is accurate in both liquid- and gas-filled formations are provided. For example, a downhole tool for obtaining such an NGD measurement may include a neutron generator, neutron detector, two gamma-ray detectors, and data processing circuitry. Neutron generator may emit neutrons into a formation, causing a fast neutron cloud to form. Neutron detector may detect a count of neutrons representing the extent of the neutron cloud. Gamma-ray detectors may detect counts of inelastic gamma-rays caused by neutrons that inelastically scatter off the formation. Since the extent of the fast neutron cloud may vary depending on whether the formation is liquid- or gas-filled, data processing circuitry may determine the density of the formation based at least in part on the counts of inelastic gamma-rays normalized to the count of neutrons. | 11-13-2014 |
| 20150076336 | NANOSTRUCTURED NEUTRON SENSITIVE MATERIALS FOR WELL LOGGING APPLICATIONS - An apparatus for estimating a property of an earth formation includes: a neutron source disposed in a borehole; a neutron detector having a neutron detection material that includes a material transparent to light having a plurality of nano-crystallites where each nano-crystallite in the plurality has a periodic crystal structure with a diameter or dimension that is less than 1000 nm and includes atoms of a neutron interaction material that emit a charged particle upon absorbing a received neutron and atoms of an activator material that provide for scintillation upon interacting with the charged particle to emit light photons wherein the atoms of the neutron interaction material and the atoms of the activator material have positions in the periodic crystal structure of each nano-crystallite in the plurality; a photodetector that receives the photons and provides a signal correlated to the photons; and a processor to estimate the property using the signal. | 03-19-2015 |
| 20150378049 | MULTIPLE SOURCE NEUTRON MEASUREMENT, DEVICE, SYSTEM AND USE THEREOF - 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. | 12-31-2015 |
| 20150378050 | NEUTRON THROUGH-PIPE MEASUREMENT, DEVICE, SYSTEM AND USE THEREOF - A method for evaluating a characteristic of a formation adjacent a wellbore comprises emitting a neutron field into the formation from a neutron source, obtaining data comprising a long neutron neutron (LNN), short neutron neutron (SNN), long neutron gamma (LNG) and short neutron gamma data (SNG) from the neutron field emitted into the formation and combining the long data with the short data to reduce error associated with the characteristic to be evaluated. A detector for evaluating a characteristic of a formation includes a neutron source and detectors for detecting LNN, SNN, LNG, SNG. | 12-31-2015 |
| 20160061991 | GAS WELL INTEGRITY INSPECTION SYSTEM - A well integrity inspection system configured to inspect a well structure including multiple concentric layers. The well integrity inspection system includes an inspection probe positioned in the well structure. The inspection probe includes a plurality of excitation assemblies for transmitting a plurality of radiation emissions into the well structure. The plurality of excitation assemblies includes at least a neutron excitation assembly and an X-ray excitation assembly. The inspection probe also includes a plurality of detection assemblies configured to receive a plurality of backscatter radiation returns from the well structure. The plurality of detection assemblies includes at least a neutron detection assembly and an X-ray detection assembly. The well integrity inspection system further including a processor operatively coupled to the inspection probe. The processor is configured to determine a well integrity parameter of the well structure based on at least one of the plurality of backscatter radiation returns. | 03-03-2016 |
| 20160195636 | ABSOLUTE ELEMENTAL CONCENTRATIONS FROM NUCLEAR SPECTROSCOPY | 07-07-2016 |
