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| Number | Title | Issue Date |
| 7975783 | Reaming and stabilization tool and method for its use in a borehole In accordance with an embodiment of the present invention, a drilling tool includes a tubular body defining a longitudinal axial cavity extending therethrough and defining at least one cutter element recess. The drilling tool also includes a cutter element at least ... | 07/12/2011 |
| 7584811 | Reaming and stabilization tool and method for its use in a borehole In accordance with an embodiment of the present invention, a drilling tool includes a tubular body defining a longitudinal axial cavity extending therethrough and defining at least one cutter element recess. The drilling tool also includes a cutter element at least ... | 09/08/2009 |
| 7401666 | Reaming and stabilization tool and method for its use in a borehole In accordance with an embodiment of the present invention, a drilling tool includes a tubular body defining a longitudinal axial cavity extending therethrough and defining at least one cutter element recess. The drilling tool also includes a cutter element at least ... | 07/22/2008 |
| 7387175 | Window reaming and coring apparatus and method of use Window reaming and coring apparatus has a reamer connected in the middle of the tool by mechanical joints which permit the reamer to be displaced substantially parallel to the rest, of the tool body. The apparatus is lowered adjacent a pre-determined zone of interes... | 06/17/2008 |
| 7350596 | Methods and apparatus for expanding the diameter of a borehole A borehole reamer which may be deployed to a desired depth in an existing uncased borehole or below existing casing and used to substantially expand the diameter of the borehole. The diameter may be expanded by an amount that ranges from a fraction to a multiple of ... | 04/01/2008 |
| 7293616 | Expandable bit An expandable drill bit for use with earth drilling equipment. The bit includes arms held in a closed position, so that the bit may be inserted through casing or a small bore hole. The arms are expandable to create an expanded drill bit having a crown profile common... | 11/13/2007 |
| 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 |
| 7195085 | Drill bit An expandable drill bit comprises a body for mounting on a support string and two roller cutters mounted on the body. The cutters are movable between a smaller diameter first configuration and a larger diameter second configuration. In one embodiment the bit is adap... | 03/27/2007 |
| 6976547 | Actuator underreamer An underreamer for forming a cavity from within a well bore includes a housing adapted to be disposed within the well bore. The underreamer includes an actuator partially slidably positioned in the housing. The actuator comprises a first portion and a second portion... | 12/20/2005 |
| 6962216 | Wedge activated underreamer An underreamer for forming a cavity from within a well bore includes a housing adapted to be disposed within the well bore. The underreamer includes at least one cutter, wherein each cutter has a first end and a second end. The first end of each cutter is pivotally ... | 11/08/2005 |
| 6668949 | Underreamer and method of use An underreamer (5) is formed from a tubular body (10) having a longitudinal bore therethrough, and providing an integral piston actuator (20) responsive to hydraulic pressure to move cutters (40) into engagement with the well bore and springs (60) to resi... | 12/30/2003 |
| 6644422 | Pantograph underreamer An underreamer for forming a cavity within a well bore is provided. The underreamer may include a housing rotatably disposed within the well bore. The underreamer may also include an actuation rod slidably positioned in the housing. The underreamer may fu... | 11/11/2003 |
| 6575255 | Pantograph underreamer An underreamer for forming a cavity within a well bore is provided. The underreamer may include a housing rotatably disposed within the well bore. The underreamer may also include a sleeve slidably positioned around the housing. The underreamer may furthe... | 06/10/2003 |
| 5853054 | 2-Stage underreamer A 2-stage underreamer for use in a subterranean wellbore includes a unitary body having upper and lower blades mounted in slots formed perpendicular to each other in the body. Separate upper and lower piston assemblies are provided for driving the blades ... | 12/29/1998 |
| 5325930 | Overcenter toggle latch apparatus A drilling tool, for example a core barrel inner tube assembly or a drilling bit, is attached to the inner end of a latch body which is removably seatable on a landing shoulder of a drill string. The inner end of the latch body mounts a drilling tool such... | 07/05/1994 |
| 4889197 | Hydraulic operated underreamer A hydraulically operated underreamer or reamer for enlargement of boreholes is to be connected to a rotating drill string. An outer movable cylinder extends the entire length of the reamer for protection of inner parts thereof. Cutter support arms are mov... | 12/26/1989 |
| 4819744 | Funnel hole ice auger An ice auger includes a pair of ice boring blades fixedly attached to the bottom of a straight inner auger drive bar. A brace and bit arrangement at the top of the drive bar is for rotating the drive bar and either forcing it down toward the ice to bore a... | 04/11/1989 |
| 4616720 | Divided-bucket type rotary excavator A divided bucket type rotary excavator comprises cutter units constructed by dividing a bottomed cylindrical bucket into plural portions, whose curved sidewalls and bottom plates are provided with bits on their leading edges. The cutter units are arranged... | 10/14/1986 |
| 4614242 | Bore hole enlarging arrangement and method A bore hole enlarging method and arrangement for connection with a rotary pipe string includes inner and outer body sections which form a body structure to provide a fluid flow path therethrough for communicating with piston and cylinder means formed betw... | 09/30/1986 |
| 4604818 | Under reaming pile bore excavating bucket and method of its excavation An under reaming pile bore excavating bucket by which an under reamed part of a pile bore is excavated and the excavated soil is moved into the bucket for easy removal of the soil. In use, the bucket is lowered to the bottom of an already excavated straig... | 08/12/1986 |
| 4586573 | Rotary expansion tool for reaming frustoconical undercuts in the walls of cylindrical holes An improved rotary expansion tool for reaming frustoconical undercuts in the walls of cylindrical holes is disclosed. The tool is comprised of an elongated sheath with a ram disposed in sliding engagement therein. The ram is provided with an enlarged head... | 05/06/1986 |
| 4550788 | Roof bolt hole groover A hole groover comprising a pair of grooving bits radially protruding from the surface of a drill rod and connected to swivel upwardly and downwardly near the end of the drill rod where the drill bit is connected. A connecting rod is connected to the insi... | 11/05/1985 |
| 4502554 | Expansible tool for reaming frustoconical undercuts in cylindrical holes An improved expansible rotary power tool for reaming frustoconical undercuts in cylindrical holes contained in dense concrete, such as flint and chert aggregates, comprises a tool having a hollow elongated sheath provided with a pair of opposing longitudi... | 03/05/1985 |
| 4488606 | Method of excavating an under-reamed pile bore An under-reaming pile bore excavator by which a straight pile bore is first excavated vertically to a given depth by rotating the main drill bits and the under-reamed bore is next excavated downward and outward into a given shape by rotating the slidable ... | 12/18/1984 |
| 4436167 | Method of excavating a pile hole and an apparatus therefor A method and an apparatus for excavating pile holes of various shapes, including a pile hole with a widened bottom and a pile hole with a widened top and widened bottom, by means of an excavating bit and widening bits.... | 03/13/1984 |
| 4410055 | Drilling tool A drilling tool for drilling a cylindrical borehole of relatively great depth in a soft material and then forming a conical enlargement adjacent the bottom of the borehole includes an axially elongated tool shank with a first drill at one end for cutting ... | 10/18/1983 |
| 4406500 | Cutting assembly including expanding wall segments of auger A mining auger comprises a cutting head carried at one end of a tubular shaft and a plurality of wall segments which in a first position thereof are disposed side by side around said shaft and in a second position thereof are disposed oblique to said shaf... | 09/27/1983 |
| 4396076 | Under-reaming pile bore excavator An under-reaming pile bore excavator by which a straight pile bore is first excavated vertically to a given depth by rotating the main drill bits and the under-reamed bore is next excavated downward and outward into a given shape by rotating the slidable ... | 08/02/1983 |
| 4384624 | Earth boring head An earth boring head comprising a generally conical earth boring member having a forward portion and a rearward portion. At least one aperture is fashioned in a forward portion of the earth boring member for liberating a lubricating fluid around the rearw... | 05/24/1983 |
| 4323129 | Hole digging apparatus and method Cables attached to a rotating Kelly nut of a drill rig serve to maintain the vertical level of pivot points of bell-cutting blades while the blades are swung outwardly about these stationary pivot points to cut a bell for a drilled hole. The bell cuttings... | 04/06/1982 |
| 4189184 | Rotary drilling and extracting process Process and apparatus is described for mining of subterranean carbonaceous deposits such as tar sands, in which the deposit is treated in situ with circulating high pressure jets of heated mining fluid comprising water in admixture with gaseous hydrocarbo... | 02/19/1980 |
| 4169510 | Drilling and belling apparatus A combination drilling and belling apparatus includes a frame having at one end a drilling area for drilling a borehole in the earth. A pair of belling arms are pivotally carried by the frame and are selectively movable between a drilling position and a n... | 10/02/1979 |
| 4064951 | Underreamer having cutter arm position indication An underreaming tool with cutter arm position indication. An elongated body portion has a coupling for coupling one end thereof to a lower end of a lower drill string. A pair of arms are pivotally mounted on the body portion. Means is provided for relativ... | 12/27/1977 |
| 4023629 | Toggle actuated underreamer An underreamer includes a housing and a plurality of underreamer doors, each including a toggle mechanism for selectively extending and retracting the doors. Upon activation of the toggle mechanism thereby extending the doors, the doors are pivoted outwar... | 05/17/1977 |
