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| Number | Title | Issue Date |
| 7882905 | Stabilizer and reamer system having extensible blades and bearing pads and method of using same Drilling systems and methods for enlarging a borehole that include an expandable reamer and an expandable stabilizer axially coupled above the expandable reamer are disclosed. The expandable reamer includes a tubular body having a longitudinal axis and a drilling fl... | 02/08/2011 |
| 7264048 | Slot cavity A method for accessing a subterranean zone from the surface includes drilling a substantially vertical well bore from the surface to the subterranean zone and forming a slot cavity in the substantially vertical well bore proximate to the subterranean zone. The slot ... | 09/04/2007 |
| 7195080 | Expandable drilling tool and method A system is provided (1) for increasing the diameter of at least a portion of a well bore, the system being intended to be attached to a drill pipe (3), the system having a support element (10) bearing cutting arms (13, 14) which is movab... | 03/27/2007 |
| 7048078 | Expandable underreamer/stabilizer A downhole tool that functions as an underreamer or as a stabilizer in an underreamed borehole. The tool includes one or more moveable arms disposed within a body having a flowbore therethrough in fluid communication with the wellbore annulus. The tool alternates be... | 05/23/2006 |
| 6880649 | Apparatus and method for directional drilling of holes An apparatus for the directional drilling of a bore hole through a solid substrate includes a main bore head mounted for rotation on a flexible drive shaft and a pilot bore head for weakening a region of substrate in advance of the main bore head, the weakened regio... | 04/19/2005 |
| 6732817 | Expandable underreamer/stabilizer A downhole tool that functions as an underreamer, or alternatively, as a stabilizer in an underreamed borehole. The tool includes one or more moveable arms disposed within a body having a flowbore therethrough in fluid communication with the wellbore annulus. The to... | 05/11/2004 |
| 6378632 | Remotely operable hydraulic underreamer An underreamer opens a borehole below a restriction that is larger than the restriction itself. The underreamer includes cutters which engage the formation by traversing outward and upward. The force pushing the cutters to the extended position is supplie... | 04/30/2002 |
| 6065551 | Method and apparatus for rotary mining The present invention is directed to a rotary mining apparatus. The apparatus includes an elongated housing with a leading end and an opposite trailing end. The apparatus also includes a compression device coupled to the housing. The apparatus further inc... | 05/23/2000 |
| 5735359 | Wellbore cutting tool A cutting tool has been invented for use in a wellbore to cut formation through which the wellbore extends or to cut items in the wellbore, the tool having, in one aspect, a body disposable at a desired location in the wellbore, at least one first blade p... | 04/07/1998 |
| 5368114 | Under-reaming tool for boreholes An under-reaming tool for use in preferably horizontal and extended reach bore holes includes a succession of stabilizers, under-reamers and expandable stabilizers. A common drilling mud activator is provided for the expandable elements of under-reamers a... | 11/29/1994 |
| 5111893 | Device for drilling in and/or lining holes in earth A device for drilling and lining holes in earth bores wherein a casing is intended to be lowered into the bore along with the drilling unit. The drilling unit is mounted on a rotating drill. The drilling unit includes a plurality of cutters which can be a... | 05/12/1992 |
| 4549614 | Drilling device A drilling device comprises a drilling head including a rotating body through which runs a duct for supplying, under pressure, air, or mud, or water or other drilling fluid. At least one rotating cutting element is mounted on a shaft fixed on the rotating... | 10/29/1985 |
| 4444279 | Drilling tool A drilling tool adapted to produce a radial enlargement along a cylindrical elementary drilled hole in concrete masonry. The tool comprises at least one cutter which is mounted in a slot in a drill sleeve which enters the elementary drilled hole, this cut... | 04/24/1984 |
