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| Number | Title | Issue Date |
| 8159227 | Methods for making directional resistivity measurements One exemplary embodiment of a method for making directional resistivity measurements includes transmitting an axial electromagnetic wave in a borehole and receiving substantially pure axial and transverse components of the wave. A ratio of the axial and transverse c... | 04/17/2012 |
| 8157002 | Slip ring apparatus for a rotary steerable tool A downhole tool includes a slip ring assembly deployed radially between a shaft and a housing. The slip ring assembly may be configured as a stand-alone assembly and is further configured to provide a plurality of distinct electrical communication channels between t... | 04/17/2012 |
| 8156801 | Flow metering device A fluid flow metering device comprises a ball valve locatable in a fluid flow, having at least two transverse bores through the ball valve, a first transverse bore and a second transverse bore. The first transverse bore includes a fluid flow metering apparatus for m... | 04/17/2012 |
| 8137543 | Sealing system for a removable internal wall within a vessel A vessel system comprising a vessel is presented. The vessel system comprises at least one internal wall located within the vessel. The vessel system further comprises at least one inflatable seal to create a seal between an outer periphery of the internal wall and ... | 03/20/2012 |
| 8109158 | Sampling apparatus A sampling apparatus for sampling a fluid enriched in a selected phase from a multiphase fluid mixture flowing into a main pipe, the multiphase fluid mixture containing at least the selected phase and one other phase, the apparatus comprising: —a sampling arrangem... | 02/07/2012 |
| 8061219 | Flow restriction insert for differential pressure measurement A flow rate device for measuring the flow rate of a fluid flowing through a wellbore is disclosed. The flow rate device includes a differential pressure conduit, a flow restrictor insert and a differential pressure measurement device. The differential pressure condu... | 11/22/2011 |
| 8022983 | Borehole imaging system for conductive and resistive drilling fluids A borehole imaging tool for use in a wellbore penetrating an earth formation includes a pad hingedly connected to a collar, a sensor array carried by the pad, and an urging assembly in connection between the pad and the collar for extending the pad toward a wall of ... | 09/20/2011 |
| 8005618 | Logging while drilling system A logging-while-drilling system for efficiently providing a reliable measurement of various petrophysical properties of subsurface earth formations. The logging-while-drilling system generally includes drilling a wellbore within an earth formation, circulating a flu... | 08/23/2011 |
| 7991556 | Methodology and application of multimodal decomposition of a composite distribution A method for analyzing formation data includes decomposing the formation data into simple components that can be used to reconstruct the formation data, wherein the decomposing is performed at a first location and includes a process to minimize an overlap between th... | 08/02/2011 |
| 7991555 | Electromagnetic directional measurements for non-parallel bed formations An orientation vector, referred to hereinafter as the “geosteering vector,” is directed to the more conductive formation area within the DOI of the tool and away from the more resistive formation areas. Accordingly, drilling in a direction opposite the geosteeri... | 08/02/2011 |
| 7991553 | Method and system for removing effects of conductive casings and wellbore and surface heterogeneity in electromagnetic imaging surveys Characterizing a reservoir with electromagnetic imaging surveys includes normalizing measured voltage data by transmitter moment, sorting the normalized voltage data into common receiver profiles, densely resampling transmitter locations using common positions for t... | 08/02/2011 |
| 7991111 | High voltage x-ray generator and related oil well formation analysis apparatus and method An apparatus and method for determining the density and other properties of a formation surrounding a borehole using a high voltage x-ray generator. One embodiment comprises a stable compact x-ray generator capable of providing radiation with energy of 250 keV and h... | 08/02/2011 |
| 7986145 | Logging tool sonde sleeve A logging tool for use in a wellbore having a sensor portion for making measurements. The tool has a sleeve enclosing the sensor portion and made of a material that is transparent to the measurements being made. One or more structural elements having physical charac... | 07/26/2011 |
| 7986144 | Sensor and insulation layer structure for well logging instruments A logging sonde includes a tube defining a sealed chamber inside. An isolation layer is disposed on an exterior of the tube. At least one sensor is disposed on an exterior of the isolation layer. The sensor includes a lead in passing through a wall of the tube. An e... | 07/26/2011 |
| 7983845 | Method and system for analyzing a laminated sand/shale formation A method for analyzing a formation, that includes plotting resistivity data points on a resistivity graph to obtain plotted resistivity data points, and selecting a first shale point on the resistivity graph based on the plotted resistivity data points. The first sh... | 07/19/2011 |
| 7960687 | Sourceless downhole X-ray tool Systems, methods, and devices relating to a sourceless X-ray downhole tool are provided. By way of example, such a downhole tool may include an X-ray generator, an X-ray detector, and data processing circuitry. The X-ray generator may emit some X-rays out of the dow... | 06/14/2011 |
| 7925483 | Methods for visualizing distances between wellbore and formation boundaries A method for displaying a formation model while drilling a wellbore in the formation includes operating a well logging instrument at a measurement point in the formation along a wellbore while the wellbore is being drilled. Measurement data regarding the formation a... | 04/12/2011 |
| 7924013 | Apparatus and system for well placement and reservoir characterization A resistivity array having a modular design includes a transmitter module with at least one antenna, wherein the transmitter module has connectors on both ends adapted to connect with other downhole tools; and a receiver module with at least one antenna, wherein the... | 04/12/2011 |
| 7916578 | Seismic wave generation systems and methods for cased wells A vibration source (10) includes an armature bar (12) having a major length dimension, and a driver (20A) positioned about the armature bar. The driver (20A) is movably coupled to the armature bar (12), and includes an electromagne... | 03/29/2011 |
| 7916092 | Flexible circuit for downhole antenna An antenna for an electromagnetic tool having a longitudinal axis and a core. The antenna includes a flexible dielectric substrate flexibly conformed about the core and an electrical conductor disposed on the dielectric substrate. The electrical conductor is dispose... | 03/29/2011 |
| 7902495 | Method and apparatus for radiation detection in a high temperature environment A radiation detector operating at high temperatures is shown comprising a 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 scinti... | 03/08/2011 |
| 7893692 | Method for estimating the formation productivity from nuclear magnetic resonance measurements A method for estimating fluid productivity of a subsurface rock formation from within a wellbore drilled therethrough includes measuring a nuclear magnetic resonance property of the formation at a plurality of lateral depths therein. The measured nuclear magnetic re... | 02/22/2011 |
| 7888933 | Method for estimating formation hydrocarbon saturation using nuclear magnetic resonance measurements A method for estimating fluid saturation in a formation penetrated by a wellbore from nuclear magnetic resonance measurements made at a plurality of lateral depths into the formation from the wellbore includes estimating a bound water volume, a total porosity and a ... | 02/15/2011 |
| 7848887 | Making directional measurements using a rotating and non-rotating drilling apparatus A system and method to determine directional measurements for a drilling tool that at times rotates and at other times does not rotate. The method includes making a first set of measurements when the apparatus is rotating, making a second set of measurements when th... | 12/07/2010 |
| 7825664 | Resistivity tool with selectable depths of investigation A wireline tool string used in a wellbore to determine formation properties is disclosed which comprises one or more transmitter tools disposed within the tool string, each transmitter tool having three linearly independent coils; a receiver tool disposed within the... | 11/02/2010 |
| 7817781 | High voltage X-ray generator and related oil well formation analysis An apparatus and method for determining the density and other properties of a formation surrounding a borehole using a high voltage x-ray generator. One embodiment comprises a stable compact x-ray generator capable of providing radiation with energy of 250 keV and h... | 10/19/2010 |
| 7812609 | Antennas for deep induction array tools with increased sensitivities Improved receiver antennas are disclosed for long offset tensor induction army logging tools. The disclosed antennas include a bobbin which accommodates a ferromagnetic core. The outer surface of the bobbin is wrapped around a binding so that winding is thicker or i... | 10/12/2010 |
| 7812608 | Extra bucking coils to balance induction arrays An electromagnetic logging tool is disclosed that includes a support; and at least one four-coil array disposed on the support, wherein the at least one four-coil array comprises: a transmitter, a bucking coil, a receiver, and a trim coil. A method for balancing an ... | 10/12/2010 |
| 7800052 | Method and system for stabilizing gain of a photomultipler used with a radiation detector A method for controlling voltage applied to a photomultiplier used in a scintillation counter radiation detector includes determining numbers of voltage pulses having each of a plurality of predetermined amplitudes generated by the photomultiplier in response to rad... | 09/21/2010 |
| 7786733 | Apparatus and system for well placement and reservoir characterization A resistivity array having a modular design includes a transmitter module with at least one antenna, wherein the transmitter module has connectors on both ends adapted to connect with other downhole tools; and a receiver module with at least one antenna, wherein the... | 08/31/2010 |
| 7782709 | Multi-physics inversion processing to predict pore pressure ahead of the drill bit Methods are disclosed to predict pore pressure ahead of the drill bit while drilling a borehole through subsurface regions. ... | 08/24/2010 |
| 7782060 | Integrated electrode resistivity and EM telemetry tool An integrated electrode resistivity and EM telemetry tool and obtaining both formation resistivity and telemetry data from the integrated tool. An integrated electrode resistivity and EM telemetry tool having a drill collar including a first portion and a second por... | 08/24/2010 |
| 7759943 | Subsurface electromagnetic measurements using cross-magnetic dipoles Sensor assemblies including transmitter and receiver antennas to respectively transmit or receive electromagnetic energy. The sensor assemblies are disposed in downhole tools adapted for subsurface disposal. The receiver is disposed at a distance less than six inche... | 07/20/2010 |
| 7759942 | Lightweight, low cost structure for formation conductivity measuring instrument A well logging instruments includes an electrically conductive sonde mandrel. At least one electrical sensor is affixed to an exterior of the mandrel. The sensor is configured to be attached to the mandrel by sliding along an exterior surface thereof. A pressure-sea... | 07/20/2010 |
| 7756642 | Characterizing an earth subterranean structure by iteratively performing inversion based on a function To characterize an earth subterranean structure using a measurement assembly including electromagnetic (EM) receivers and one or more EM sources, measured voltage data collected by EM receivers in response to transmission by one or more EM sources is received. Based... | 07/13/2010 |
| 7755361 | Apparatus and system for well placement and reservoir characterization A modular downhole apparatus to determine a formation property, the apparatus being incorporated into a drill string comprising one or more downhole tools and drill pipe, the drill pipe being of the same or various lengths, the modular downhole apparatus comprising ... | 07/13/2010 |
| 7741841 | Time-lapsed diffusivity logging for monitoring enhanced oil recovery The use of time-lapsed NMR diffusivity measurements in an observation well is disclosed. The observation well is cased in the zone of interest with non-magnetic and non-conductive casing that is invisible to the NMR tool. Second, because NMR measurements have a dead... | 06/22/2010 |
| 7723989 | Transducer assemblies for subsurface use Transducer apparatus for subsurface use. A tubular configured for subsurface disposal is equipped with a cylindrical transducer module formed of a non-conductive material. The module is mounted to surround a section of the tubular and includes a transducer element d... | 05/25/2010 |
| 7721809 | Wellbore instrument module having magnetic clamp for use in cased wellbores A magnetically clamped wellbore instrument module includes a substantially non-magnetic housing configured to traverse an interior of the wellbore. At least one electromagnet is disposed at a longitudinally spaced apart position along the housing. The at least one e... | 05/25/2010 |
| 7711488 | Methods and apparatus to monitor contamination levels in a formation fluid Apparatus and methods to monitor contamination levels in a formation fluid arc disclosed. An example method involves obtaining first property data indicative of a first fluid property of a formation fluid and second property data indicative of a second fluid propert... | 05/04/2010 |
