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| Number | Title | Issue Date |
| 8113298 | Wireline communication system for deep wells A wireline apparatus for deep well measurements in a borehole being drilled includes a drill string having multiple drill pipe sections connected end-to-end, with at least one of the drill pipe sections being electrically conductive and isolated to provide an electr... | 02/14/2012 |
| 7687950 | Drillstring alternator A downhole source of electrical power for drilling tools is driven by the rotation of a drillstring or, if the drillstring is not rotating, by the rotation of a drilling sub. The source consists of an alternator having a rotor made up of a series of coils that are m... | 03/30/2010 |
| 7510030 | Elongated cross coil assembly for use in borehole location determination A pair of elongated crossed coils is deployed in a first borehole and an instrument containing magnetic field sensors is deployed in a second borehole. The crossed coils are energized in quadrature by AC currents producing a rotating, elliptically polarized magnetic... | 03/31/2009 |
| 7219749 | Single solenoid guide system Measurement of the location and direction of a drill head in a borehole extending beneath an obstacle such as a body of water utilizes a single AC solenoid at a known location but having an unknown orientation. The measurements are used to direct the path of the bor... | 05/22/2007 |
| 6626252 | Two solenoid guide system for horizontal boreholes An electromagnetic method and apparatus for directional drilling guidance of horizontal boreholes for the installation of pipelines and communication cables beneath rivers, highways and other obstacles is disclosed. A solenoid source, with horizontal axes... | 09/30/2003 |
