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| Number | Title | Issue Date |
| 7134512 | Method of downhole drilling and apparatus therefor A downhole drilling apparatus suspended by tubing includes a drill bit driven by an electric motor powered by a cable means. The motor is mounted upon a hollow shaft which allows fluid to pass through, so that a fluid circuit along the tube and back along the annulu... | 11/14/2006 |
| 7030617 | System, apparatus, and method for conducting electromagnetic induction surveys A method is provided for conducting an electromagnetic induction survey of a geological formation penetrated by a borehole lined with a conductive casing. The method includes positioning a transmitter in the borehole, whereby the transmitter generates a transmitter ... | 04/18/2006 |
| 7011162 | Hydraulically activated swivel for running expandable components with tailpipe An apparatus for use in a wellbore, the apparatus comprises a top body, a bottom body, and a sleeve mechanically connected to the top and bottom bodies. The sleeve movable between a first position to a second position, whereby in the first position, the top and bott... | 03/14/2006 |
| 5018590 | Electromagnetic drilling apparatus Oil drilling apparatus for drilling deep boreholes. The apparatus includes a high frequency, high voltage, AC generator at the surface of the ground which is connected to an electromagnetic hammer drill bit located at the bottom of the borehole. Electric ... | 05/28/1991 |
| 4558751 | Apparatus for transporting equipment through a conduit Apparatus 10 for propelling equipment through a fluid-filled conduit 12, such as a pipeline or oil well tubular. The propulsion apparatus incorporates first and second elements 14,16 adapted to be moved in a first axial direction through the conduit 12 an... | 12/17/1985 |
| 4273193 | Process for use in degasification of subterranean mineral deposits A process for drilling spaced horizontal boreholes in a coal or other mineral deposit in excess of 1500 feet in length in a pattern determined to maximize gas removal. Directional guidance is provided by a continuous downhole survey tool connected to data... | 06/16/1981 |
| 4271915 | Elastically vibratory longitudinal jacketed drill A drill bit is connected to the bottom end of a longitudinally elastic drill stem which is contained within a jacket. An orbiting mass oscillator is coupled to the drill stem, this oscillator generating vibrational energy at a sonic frequency. The rotatio... | 06/09/1981 |
| 4181184 | Soft-wire conductor wellbore telemetry system and method A resilient conductor having an outer flexible insulating coating and an inner flexible conducting core is employed in a drill string to maintain an electric circuit between a subsurface and surface location. The conductor is inserted in the drill string ... | 01/01/1980 |
