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| Number | Title | Issue Date |
| 8049508 | Method and apparatus for determining formation boundary near the bit for conductive mud A method and apparatus for determining a parameter of interest of an earth formation during drilling of a borehole. A first toroidal coil antenna induces a current along a path that includes a bottomhole assembly and the formation. A second toroidal coil antenna dis... | 11/01/2011 |
| 7525315 | Resistivity logging tool and method for building the resistivity logging tool A combined resistivity tool incorporating both induction/propagation antennas and lateral resistivity antennas disposed in recesses of downhole tubulars, in which a lateral resistivity antenna includes an insulating base layer disposed in the recess; a toroidal ante... | 04/28/2009 |
| 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 |
| 7303007 | Method and apparatus for transmitting sensor response data and power through a mud motor Apparatus and methods for establishing electrical communication between an instrument subsection disposed below a mud motor and an electronics sonde disposed above the mud motor in a drill string conveyed borehole logging system. Electrical communication is establis... | 12/04/2007 |
| 7288928 | Solenoidal Hall effects current sensor A device for measuring anode tube current or filament current in an X-ray tube, comprising a coil of wire wrapped around an insulating tube to generate a solenoidal magnetic field, one or more pieces of magnetic material and insulating material located within the tu... | 10/30/2007 |
| 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 |
| 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 |
| 7224288 | Link module for a downhole drilling network A repeater is disclosed in one embodiment of the present invention as including a cylindrical housing, characterized by a proximal end and a distal end, and having a substantially cylindrical wall, the cylindrical wall defining a central bore passing therethrough. T... | 05/29/2007 |
| 7183778 | Apparatus and method to measure fluid resistivity An apparatus for measuring fluid resistivity includes a flow line adapted to be in fluid communication with formation fluids, wherein the flow line includes a first section comprising a first conductive area, a second section comprising a second conductive area, and... | 02/27/2007 |
| 7168507 | Recalibration of downhole sensors In downhole drilling tools, a first set of inexpensive and/or relatively small sensors that typically have lower accuracy and higher drift than conventional downhole sensors are located in the drill string adjacent to the bit. A second set of highly accurate sensors... | 01/30/2007 |
| 7126343 | Conductivity probe with toroid keeper An apparatus and associated process for constructing a conductivity probe are disclosed. The conductivity probe includes at least two magnetic circuits in toroidal shape. Each of these “toroids” includes a ferrite core around which is wrapped a conductive wire (... | 10/24/2006 |
| 7066282 | Apparatus and methods for measuring formation characteristics in presence of conductive and non-conductive muds Tools for investigating an earth formation in the presence of either oil-base or water-base mud include a circuit which induces current into the formation in a focused manner, and a sensor electrode which is isolated from the circuit, at least partially surrounded b... | 06/27/2006 |
| 7031839 | Multi-frequency focusing for MWD resistivity tools An induction logging tool is used on a MWD bottom hole assembly. Due to the finite, nonzero, conductivity of the mandrel, conventional multi frequency focusing (MFF) does not work. A correction is made to the induction logging data to give measurements simulating a ... | 04/18/2006 |
| 6968735 | Long range data transmitter for horizontal directional drilling An apparatus for monitoring conditions in subterranean borehole during drilling and pullback operations in real time. The apparatus includes a drill string having a working end. A measurement system suitable for measuring at least one operational characteristic of t... | 11/29/2005 |
| 6958610 | Method and apparatus measuring electrical anisotropy in formations surrounding a wellbore A logging tool is disclosed having transmitting and receiving antennas to measure formation anisotropy. The antennas may preferably be combinations of toroidal, horizontal electric dipole, and horizontal magnetic dipole antennas. In one embodiment, the tool: (a) ind... | 10/25/2005 |
| 6956371 | Method and apparatus for detecting diffusion sensitive phases with estimation of residual error in NMR logs A method and system are disclosed for NMR echo-train data acquisition and processing for enhanced tracking of the error in the signal due to magnetoacoustic effects, known as ringing, that are not cancelled out or otherwise corrected. In one aspect, the method enabl... | 10/18/2005 |
| 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 |
| 6910534 | Apparatus for attaching a sensor to a tubing string A method and apparatus, for deploying a sensor attached to tubing in a highly deviated or horizontal wellbore, that are characterized by a stationary attachment system that securely fixes a sensor to a tubing string such that the sensor is coupled to the casing rega... | 06/28/2005 |
| 6484133 | Sensor response rate accelerator An apparatus and method for sensor signal prediction and for improving sensor signal response time, is disclosed. An adaptive filter or an artificial neural network is utilized to provide predictive sensor signal output and is further used to reduce senso... | 11/19/2002 |
| 6452564 | RF surface wave attenuating dielectric coatings composed of conducting, high aspect ratio biologically-derived particles in a polymer matrix A coating composite is provided for a platform surface of an antenna array for, when applied to the platform, affording isolation of radiating and receiving antennas of the array. The coating composite includes a plurality of conductively coated elongate ... | 09/17/2002 |
| 6177882 | Electromagnetic-to-acoustic and acoustic-to-electromagnetic repeaters and methods for use of same A downhole communications system including an electromagnetic-to-acoustic signal repeater (35) for communicating information between surface equipment and downhole equipment and a method for use of the repeater (35) is disclosed. The repeater (35) compris... | 01/23/2001 |
| 5942990 | Electromagnetic signal repeater and method for use of same A downhole electromagnetic signal repeater (76) for communicating information between surface equipment and downhole equipment and a method for use of the repeater (76) is disclosed. The repeater (76) comprises a receiver (120) and a transmitter (124). Th... | 08/24/1999 |
| 5892460 | Logging while drilling tool with azimuthal sensistivity An azimuthally sensitive LWD tool is disclosed, comprising a transmitting antenna, a receiving antenna, wherein the receiving antenna is azimuthally focused so as to be more sensitive to changes in magnetic flux in a particular azimuthal segment of the an... | 04/06/1999 |
| 5359324 | Well logging apparatus for investigating earth formations A logging-while-drilling system is disclosed in which a first subassembly is included near the drill bit, and this subassembly comprises a conducting body with measuring means disposed in it and a first toroidal coil antenna disposed on the body, means fo... | 10/25/1994 |
| 5339036 | Logging while drilling apparatus with blade mounted electrode for determining resistivity of surrounding formation Measurement-while-drilling apparatus is disclosed for determining the resistivity of formations surrounding an earth borehole. An electrically conductive metal body, such as a drill collar on a drill string, is movable through the borehole. A transmitting... | 08/16/1994 |
| 5235285 | Well logging apparatus having toroidal induction antenna for measuring, while drilling, resistivity of earth formations Apparatus is disclosed for determining the resistivity of formations surrounding an earth borehole. An electrically conductive metal body, such as a drill collar on a drill string, is movable through the borehole. A transmitting toroidal coil antenna is d... | 08/10/1993 |
| 5212495 | Composite shell for protecting an antenna of a formation evaluation tool A fiber reinforced polymer matrix composite shell for covering the elastomeric layer surrounding the antenna of a measurement-while-drilling borehole formation evaluation tool is disclosed. The shell protects the elastomeric layer and associated antenna f... | 05/18/1993 |
| 5045795 | Azimuthally oriented coil array for MWD resistivity logging A coil array which is installed on a MWD drill collar for use in a resistivity logging system. The drill collar is provided with upper and lower coil support rings. These are toroids which support individual coil segments, and are connected by suitable ma... | 09/03/1991 |
| 4933640 | Apparatus for locating an elongated conductive body by electromagnetic measurement while drilling A method and apparatus for determining the distance and direction of a well from a borehole. A toroidal inductor surrounds a drill stem within a borehole. The inductor acts as a primary for a transformer, with the drill stem, the earth surrounding the bor... | 06/12/1990 |
| 4739325 | Apparatus and method for down-hole EM telemetry while drilling An MWD EM data/control telemetry link between down-hole instruments and ground surface instruments dynamically adapts to the underground electrical environment utilizing a down-hole microprocessor unit and a surface data processing unit (computer) each of... | 04/19/1988 |
| 4578675 | Apparatus and method for logging wells while drilling An information while drilling apparatus and method for characterizing strata in the vicinity of a drill bit at the lower end of a drill string, including a down-hole module unit and surface receiving and control units. Excitation currents are caused to pa... | 03/25/1986 |
| 4553097 | Well logging apparatus and method using transverse magnetic mode A well logging apparatus and method is disclosed which can be used as a wireline logging device or technique, and is also suitable for being employed in a logging-while-drilling device. Electromagnetic energy having primarily a transverse magnetic mode co... | 11/12/1985 |
| 4538109 | Apparatus and method for electromagnetic logging with reduction of spurious modes The disclosure is directed to an apparatus and method for subsurface electromagnetic logging in a borehole wherein means are provided to detect transverse magnetic mode components and to either correct for these spurious components in the processing of th... | 08/27/1985 |
