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| Number | Title | Issue Date |
| 8044819 | Coal boundary detection using an electric-field borehole telemetry apparatus A method to detect the relative position of a drill bit with respect to a coal seam boundary using an electric-field borehole telemetry apparatus, that includes the steps: providing a measure-while-drilling apparatus that includes inclination sensors, directional se... | 10/25/2011 |
| 7576532 | Motion transducer for motion related to the direction of the axis of an eddy-current displacement sensor A motion transducer comprising one or more electromagnetic coils provided on a first element, each of the coils having a magnetic axis of symmetry. ... | 08/18/2009 |
| 7287605 | Steerable drilling apparatus having a differential displacement side-force exerting mechanism An apparatus for steerable rotary drilling of a borehole having a wall in the earth comprising a mandrel having a central opening there through for the passage of drilling fluids. The mandrel having a lower connection for operatively connecting to a drill bit struct... | 10/30/2007 |
| 7225888 | Hydraulic fluid coupling For use in a wellbore containing a rotary drill string and a drill bit, the combination comprising, a rotary mandrel containing a through opening to pass drilling fluid downwardly from the interior of the drill string, and toward the bit, a non-rotary housing extend... | 06/05/2007 |
| 7028409 | Method for computation of differential azimuth from spaced-apart gravity component measurements A method is provided for computing the differential azimuth between two sets of spaced-apart gravity component measurement devices in a borehole, employing multiple rotation angles. The method includes modeling relationships of axes as defined; forming equations rel... | 04/18/2006 |
| 6816788 | Inertially-stabilized magnetometer measuring apparatus for use in a borehole rotary environment A measurement apparatus for making magnetic and gravity component measurements in a borehole, including measurements made while the apparatus is rotating about the borehole axis, comprising a magnetic field component sensing device having at least two axes of sensit... | 11/09/2004 |
| 6698516 | Method for magnetizing wellbore tubulars In the method of providing for well tubular member magnetization, the steps include providing a magnetizing structure comprising an electrical coil defining an axis, relatively displacing the member and the structure, with the coil positioned and guided i... | 03/02/2004 |
| 6651496 | Inertially-stabilized magnetometer measuring apparatus for use in a borehole rotary environment A measurement apparatus for making magnetic and gravity component measurements in a borehole, including measurements made while the apparatus is rotating about the borehole axis, comprising a magnetic field component sensing device having at least two axe... | 11/25/2003 |
| 6608565 | Downward communication in a borehole through drill string rotary modulation A method for downward communication in a borehole containing a pipe string, comprising the steps of: imparting a series of rotary motions to an upper portion of the string, the rotary motions representing at least two levels of a coded data sequence, the ... | 08/19/2003 |
| 6530154 | Method to detect deviations from a wellplan while drilling in the presence of magnetic interference A method for drilling a wellbore to assure the avoidance of a substantially adjacent known magnetic source comprising the steps of obtaining survey data for the path or trajectory of a known magnetic source; preparing a wellplan comprising a path or traje... | 03/11/2003 |
| 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 |
| 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 |
| 6188223 | Electric field borehole telemetry An apparatus for borehole electric field telemetry includes a source of modulated voltage or current, at least one axially extending collar collar connected between pipe sections in a pipe string, and a system of insulated wireline components providing el... | 02/13/2001 |
| 5960370 | Method to determine local variations of the earth's magnetic field and location of the source thereof A method to determine the earth's magnetic field vector along a sub-surface wellpath having unknown and possibly changing azimuth, in the presence of a magnetic disturbance caused by a magnetic source external to the wellpath includes estimating the three... | 09/28/1999 |
| 5883516 | Apparatus and method for electric field telemetry employing component upper and lower housings in a well pipestring An apparatus for borehole electric field telemetry includes a source of modulated voltage or current, at least one axially extending collar connected between pipe sections in a pipe string, and a system of insulated wireline components providing electrica... | 03/16/1999 |
| 5836353 | Valve assembly for borehole telemetry in drilling fluid Pressure pulses in a flowing stream are generated by movement radially of an elastomer membrane surrounding a perforated tube. Movement outward of the membrane is initiated by closing of a pilot valve in the tube, but is accelerated by pressure increases ... | 11/17/1998 |
| 5740127 | Pulse production and control in drill strings In fluid pulsing apparatus operable in a drill pipe in a well in which well drilling fluid flows, wherein pressure pulses are created by restricting one or more of several hydraulically parallel paths, constant working pressure regulating valves with a lo... | 04/14/1998 |
| 5590714 | Multi-mode cushioning an instrument suspended in a well An apparatus for the protection of instrumentation placed within a drill string in a well, as during drilling comprising support structure, including a carrier sized for reception in the string, and; elastomeric structure carried by the support structure ... | 01/07/1997 |
| 5520246 | Multi-mode cushioning an instrument suspended in a well An apparatus for the protection of instrumentation placed within a drill string in a well, as during drilling comprising support structure, including a carrier sized for reception in the string, and; elastomeric structure carried by the support structure ... | 05/28/1996 |
| 5507348 | Apparatus for locking wire line instrument to drill collar An apparatus for supporting instrumentation in a drill collar in a well, such instrumentation being subject to travel in the well to and from the drill collar comprising instrumentation having upper and lower end portions and being elongated between the e... | 04/16/1996 |
| 5389003 | Wireline wet connection A releasable and reseatable electrical connection between female and male members associated with disconnectible sections of wireline used in a drill string in a borehole comprising the male member defining a first axis and having an externally exposed el... | 02/14/1995 |
| 5366018 | Miniature rope socket assembly for combined mechanical and electrical connection in a borehole wireline A rope socket assembly for making a combined electrical and mechanical connection in a wireline having an inner electrical conductor, a coaxial insulation layer about the conductor, and an outer protection wire covering about the insulation layer for surv... | 11/22/1994 |
| 5321893 | Calibration correction method for magnetic survey tools A method for determining the orientation of the axis of a borehole with respect to an Earth-fixed reference coordinate system at a selected series of locations in the borehole, the borehole having a trajectory, and adapted to receive a drill string, compr... | 06/21/1994 |
| 5155916 | Error reduction in compensation of drill string interference for magnetic survey tools A method for determining the orientation of the axis of a borehole with respect to an earth-fixed reference coordinate system at a location in the borehole comprising the steps of: measuring two cross-borehole components or two-cross-borehole components a... | 10/20/1992 |
| 5130706 | Direct switching modulation for electromagnetic borehole telemetry An apparatus for borehole electromagnetic telemetry is provided comprising a direct switching element to couple energy from a downhole energy source to the earth-drillstring system, a downhole energy source that may be adapted to a variety of voltage leve... | 07/14/1992 |
| 4774694 | Well information telemetry by variation of mud flow rate Information is conveyed from a downhole location within a well, by varying the rate of flow of drilling fluid at the downhole location in accordance with changes in a predetermined condition at that location, and then sensing variations in the rate of flo... | 09/27/1988 |
| 4715022 | Detection means for mud pulse telemetry system Information is conveyed from a downhole location within a wellbore being drilled by producing pressure and velocity of flow variations from the steady state drilling fluid pressure and velocity of flow so as to set up transient acoustic waves that propaga... | 12/22/1987 |
| 4694439 | Well information telemetry by variation of mud flow rate Information is conveyed from downhole location within a well, by varying the rate of flow of drilling fluid at the downhole location in accordance with changes in a predetermined condition at that location, and then sensing variations in the rate of flow ... | 09/15/1987 |
| 4649344 | Test circuit for detector used in well bore A device to be lowered into a string of well drilling pipe to the location of a non-magnetic section of the pipe near its lower end, with the device including a compass assembly or other instrument for making a photograph or other record at that location.... | 03/10/1987 |
