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| Number | Title | Issue Date |
| 7290625 | Reverse-circulation drilling method and system A reverse-circulation drilling method and system includes a drill bit, a drill string having drill rods, and a rotary table or power swivel for bringing the drill bit into rotation by means of the rods. The system includes a positive-displacement pump made up of a s... | 11/06/2007 |
| 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 |
| 7055627 | Wellbore fluid circulation system and method The present invention provides drilling systems for drilling wellbores. The drilling system includes an umbilical that passes through a wellhead and carries a drill bit. A drilling fluid system supplies drilling fluid into an annulus (supply line) between the umbili... | 06/06/2006 |
| 6955232 | Equipment for drilling vertical boreholes The invention relates to equipment for drilling a vertical borehole in hard ground, the equipment comprising: casing put successively into place in the borehole; a drilling machine having a rotary cutting head and ... | 10/18/2005 |
| 6926102 | Subsea controlled milling Subsea controlled milling apparatus and methods. In a described embodiment, a method of controlling displacement of a cutting device conveyed on a tubular string in a subterranean well includes the steps of: interconnecting an apparatus in the tubular string, the ap... | 08/09/2005 |
| 6857486 | High power umbilicals for subterranean electric drilling machines and remotely operated vehicles The method of providing in excess of 60 kilowatts of electrical power to the electrical motor of a subterranean electric drilling machine through a substantially neutrally buoyant composite umbilical containing electrical conductors to reduce the frictional drag on ... | 02/22/2005 |
| 6761233 | Apparatus for propulsion in elongated cavities An apparatus for propulsion inside an oblong cavity, such as pipes or the like, is disclosed. The apparatus is characterized by comprising a central rotating part comprising an inclined wheel construction arranged to thrust towards the inner wall of the cavity, in t... | 07/13/2004 |
| 6722453 | Stabilized downhole drilling motor A downhole drilling motor comprises a housing including an integral stabilizing configuration. The stabilizing configuration may include a number of ribs which project from the surface of the housing and run longitudinally or helically along the housing. The stabili... | 04/20/2004 |
| 6655458 | Formation testing instrument having extensible housing A well logging instrument is disclosed which includes a housing operatively coupled to a well logging conveyance and movable within the wellbore. The housing has therein a formation testing system and an axial extension mechanism. The axial extension mech... | 12/02/2003 |
| 6575236 | Device for manipulating a tool in a well tubular A device is provided for manipulating a tool in a well tubular. The device includes a cylindrical housing having a front end and a rear end, and radially extendible dogs for securing the device in the well tubular. A shaft is also included that is axially... | 06/10/2003 |
| 5205365 | Pressure assisted running of tubulars A pressure actuated, telescoping subassembly is supported by a pipe string to axially move an attached member within a wellbore. Increasing fluid pressure to the subassembly actuates a telescoping action, axially moving the attached member but not the sup... | 04/27/1993 |
| 4669555 | Downhole circulation pump A pump for circulating fluids downhole. The rotor of a positive displacement pump transmits torque from the upper drill string section to a tool attached to the lower end of the pump. Bow springs prevent the stator portion of the pump from rotating in the... | 06/02/1987 |
| 4051910 | Two way earth boring fluid motor There is disclosed a fluid motor composed of a helical gear pair wherein an inner chamber has an external helical thread and a cooperating outer member has one more internal helical thread than the number of external helical threads on the inner member. T... | 10/04/1977 |
