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| Number | Title | Issue Date |
| 8129994 | Microresistivity imaging in conductive and nonconductive drilling fluid A microresistivity logging tool includes a shield electrode deployed between a guard electrode and a return electrode. A measuring electrode is deployed in and electrically isolated from the guard electrode and first and second potential electrodes are deployed in a... | 03/06/2012 |
| 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 |
| 7576543 | Apparatus and method for resistivity measurements during rotational drilling A resistivity sub including a resistivity sensor forms part of a bottom hole drilling assembly. The sensor is maintained at a substantially fixed offset from the wall of a borehole during drilling operations by, for example, a stabilizer. In WBM, galvanic sensors ma... | 08/18/2009 |
| 7554329 | Method and apparatus for determining formation resistivity ahead of the bit and azimuthal at the bit A method and apparatus for obtaining a resistivity measurement of an earth formation surrounding a borehole in an MWD device uses the drillbit and the adjacent portion of the drill collar as a focusing electrode for focusing the measure current from a measure electr... | 06/30/2009 |
| 7466136 | While-drilling methodology for determining earth formation characteristics and other useful information based upon streaming potential measurements Logging-while-drilling apparatus and methodologies for measuring streaming potential in an earth formation are provided. The apparatus and methodologies can be utilized to find information relevant to the drilling operations. In particular, since the streaming poten... | 12/16/2008 |
| 7437251 | Correction of sensor non-equipotentiality in a resistivity imaging device A method for correcting data from at least one sensor electrode in a sensor includes determining a potential difference (V) between two electrodes; from the potential difference (V), determining a by-pass current (Ic) for the at least one sensor electrode... | 10/14/2008 |
| 7394257 | Modular downhole tool system A downhole tool for formation logging includes a tool body configured to move in a borehole; and at least one sensor module mounted in at least one mounting location on the tool body, wherein the at least one sensor module is interchangeable with other sensor module... | 07/01/2008 |
| 7350568 | Logging a well A method for logging a well. Includes receiving energy with at least one array of elements coupled to a drill bit, wherein the at least one array of elements functions as an electronic array. An apparatus for logging a well includes a drill bit and at least one arra... | 04/01/2008 |
| 7327145 | Azimuthally focused electromagnetic measurement tool An azimuthally sensitive electromagnetic measurement tool is provided. The tool may be suitable, for example, to measure azimuthal variations of electrical properties of a subterranean formation. The tool includes a transmitter disposed to transmit electromagnetic e... | 02/05/2008 |
| 7302346 | Data logging A device and method for determining a geophysical characteristic of a borehole using at least one logging device is provided, wherein the at least one logging device includes at least one sensing device. The method includes associating the at least one sensing devic... | 11/27/2007 |
| 7256582 | Method and apparatus for improved current focusing in galvanic resistivity measurement tools for wireline and measurement-while-drilling applications A galvanic resistivity tool with one or more measurement electrodes and guard electrodes, and one or more shielding electrodes. The potential difference between the measurement electrodes and the guard electrodes is controlled to minimize current flow between the me... | 08/14/2007 |
| 7252144 | Magnetometers for measurement-while-drilling applications A nuclear sensor on a bottomhole assembly (BHA) makes measurements of a property of an earth formation during continued rotation of the BHA. Magnetometers that are susceptible to bias error are deployed on the BHA to make measurements of the magnetic toolface angle.... | 08/07/2007 |
| 7250768 | Apparatus and method for resistivity measurements during rotational drilling A resistivity sub including a resistivity sensor forms part of a bottom hole drilling assembly. The sensor is maintained at a substantially fixed offset from the wall of a borehole during drilling operations by, for example, a stabilizer. In WBM, galvanic sensors ma... | 07/31/2007 |
| 7227363 | Determining formation anisotropy based in part on lateral current flow measurements Disclosed herein are methods and apparatus using one or more toroids to measure formation anisotropy and/or vertical conductivity. In one embodiment, a disclosed method comprises: inducing a current to flow through a conductive surface of a tool body into a surround... | 06/05/2007 |
| 7172038 | Well system The drilling system includes a work string supporting a bottom hole assembly. The work string including lengths of pipe having a non-metallic portion. The work string preferably includes a composite coiled tubing having a fluid impermeable liner, multiple load carry... | 02/06/2007 |
| 7095233 | System, apparatus, and method of conducting borehole resistivity measurements A logging-while-drilling tool is adapted for incorporation with a drill string having a longitudinal axis. The drill string is further adapted for drilling a wellbore penetrating a geological formation. The drilling tool includes a tool body having a central axis di... | 08/22/2006 |
| 7091722 | Method and apparatus for measuring mud resistivity A sensor for measuring mud resistivity in a borehole includes a transmitter having a magnetic moment in a first direction; and a receiver having a magnetic moment in a second direction, wherein the first direction and the second direction are substantially different... | 08/15/2006 |
| 7071696 | Measurement device and support for use in a well The invention provides a support for measurement means for monitoring and/or studying a fluid reservoir (13) through which at least one well (11) passes, said support comprising: a cylindrical tube (2); and a jacket (3) surrounding said c... | 07/04/2006 |
| 7049855 | Area efficient waveform evaluation and DC offset cancellation circuits Analog circuits for providing one or more waveform parameters, e.g., the DC offset or average, of an analog input signal. Separate biasing is not necessarily required. Some embodiments comprise field-effect-transistors (FETs) configured in various diode-connected co... | 05/23/2006 |
| 7042225 | Apparatus and methods for induction-SFL logging A well logging tool includes an induction array stack disposed on a mandrel; an electronic module stack disposed adjacent the induction array stack along a longitudinal axis of the well logging tool; and a shallow electrode array arranged on a housing disposed aroun... | 05/09/2006 |
| 7034537 | MRI apparatus correcting vibratory static magnetic field fluctuations, by utilizing the static magnetic fluctuation itself An MRI apparatus having an open structure includes a static magnetic field generating magnet including magnetic field generating sources arranged above and below an imaging space and magnetic field fluctuation reducing plates arranged inside the magnet. Gradient mag... | 04/25/2006 |
| 7034539 | Underground exploration apparatus, system and method The object of the present invention is to realize a low-invasive underground exploration apparatus, system, and method which are capable of specifying the kind, three-dimensional position, and amount of a substance present in the ground. The underground exploration ... | 04/25/2006 |
| 6978833 | Methods, apparatus, and systems for obtaining formation information utilizing sensors attached to a casing in a wellbore Improved methods, apparatus, and systems for obtaining information regarding a formation, a casing, or fluid within the casing utilize an interrogator and one or more sensing devices attached to a casing in a wellbore. The interrogator, which is located and typicall... | 12/27/2005 |
| 6975243 | Downhole tubular with openings for signal passage Systems and methods for downhole communication and measurement utilizing an improved metallic tubular having an elongated body with tubular walls and a central bore adapted to receive a run-in tool. The tubular including slotted stations to provide through-tubular s... | 12/13/2005 |
| 6927578 | Detection of borehole currents due to a decentered transverse magnetic dipole transmitter The invention provides an apparatus for making an electromagnetic measurement from within a subsurface borehole. The apparatus comprises an elongated support having electrically conductive segments and adapted for disposal within the borehole; an antenna adapted to ... | 08/09/2005 |
| 6923273 | Well system The drilling system includes a work string supporting a bottom hole assembly. The work string including lengths of pipe having a non-metallic portion. The work string preferably includes a composite coiled tubing having a fluid impermeable liner, multiple load carry... | 08/02/2005 |
| 6885308 | Logging while tripping with a modified tubular Method and system for subsurface logging utilizing a modified tubular having an elongated body with tubular walls and a central bore adapted to receive a support member. The tubular including slotted stations to provide through-tubular signal passage. Pressure barri... | 04/26/2005 |
| 6854535 | Bore location system and method of calibration A method for calibrating a pitch measurement of a horizontal underground bore location system includes providing a probe having a pitch sensor that measures deviation between a predetermined orientation and a measurement axis. A receiver has an antenna that detects ... | 02/15/2005 |
| 6850068 | Formation resistivity measurement sensor contained onboard a drill bit (resistivity in bit) A method and apparatus for obtaining a resistivity measurement of an earth formation surrounding a borehole in an MWD device uses an electrode for injecting current into the earth formation and an electrode for obtaining a responsive signal from the borehole. The el... | 02/01/2005 |
| 6727707 | Method and apparatus for a downhole antenna A method and apparatus for a downhole antenna comprising a housing having an outer surface and a longitudinally bored inner cavity, the outer surface having a first slot and a corresponding second slot extending from the outer surface to the longitudinally bored inn... | 04/27/2004 |
| 6600321 | Apparatus and method for wellbore resistivity determination and imaging using capacitive coupling An apparatus for obtaining resistivity images of a borehole having an oil-based mud includes a rotating measure electrode on a measurement-while-drilling apparatus. A modulated measure current is capacitively coupled to the formation through the nonconduc... | 07/29/2003 |
| 6577244 | Method and apparatus for downhole signal communication and measurement through a metal tubular Systems and methods for downhole communication and measurement utilizing an improved metallic tubular having an elongated body with tubular walls and a central bore adapted to receive a run-in tool. The tubular including slotted stations to provide throug... | 06/10/2003 |
| 6483310 | Retrievable, formation resistivity tool, having a slotted collar A sonde is movable lengthwise in and relative to tubular structure such as a drill collar; slits extend through the tubular structure; and antennae coils on the sonde come into registration with the slits, for transmitting electromagnetic energy into the ... | 11/19/2002 |
| 6462561 | Standoff distance variation compensator and equalizer An inventively enhanced near-field sensor includes circuitry which removes variation in standoff distance (of the sensor from the inspected object) as a factor in the inspection system readings. An original output voltage which varies linearly according t... | 10/08/2002 |
| 6454023 | Mapping tool for tracking and/or guiding an underground boring tool Systems and associated methods for tracking and/or guiding an underground boring tool use one or more detectors to measure the intensity of an electromagnetic field which is transmitted from an underground boring tool. The measured intensities may then be... | 09/24/2002 |
| 6396276 | Apparatus and method for electric field telemetry employing component upper and lower housings in a well pipestring An apparatus for borehole electric-field telemetry that comprises a source of modulated voltage or current, at least one axially non-conductive collar connected between pipe sections in a pipe string, and a system of insulated wireline components providin... | 05/28/2002 |
| 6384605 | Method and apparatus for measurement of borehole size and the resistivity of surrounding earth formations A method and apparatus for determining the size or diameter of boreholes extending to a wide range of dimensions and/or the resistivity of the surrounding earth formations utilizing a well tool disposed in the borehole. The method involves generating mode... | 05/07/2002 |
| 6373254 | Method and apparatus for controlling the effect of contact impedance on a galvanic tool in a logging-while-drilling application The present invention describes a method and apparatus to control the effect of contact impedance on a formation resistivity measurement during a logging-while-drilling operation. The control of contact impedance is accomplished by maintaining a substanti... | 04/16/2002 |
| 6359438 | Multi-depth focused resistivity imaging tool for logging while drilling applications A resistivity tool for use in an LWD system includes a transmitter array with multiple transmitters positioned above a pair of receivers. The transmitters are selectively energized, causing current to be induced in the collar of the tool. The axial curren... | 03/19/2002 |
| 6288548 | Method and apparatus for making electromagnetic induction measurements through a drill collar A method and apparatus is disclosed for performing measurement-while-drilling operations in a borehole to interrogate the borehole and the surrounding formation utilizing electromagnetic fields. A measurement sonde is provided which includes at least one ... | 09/11/2001 |
