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| Number | Title | Issue Date |
| 7410013 | Boring and drilling apparatus An apparatus (10) for use in boring is described, the apparatus including a rotatable drive shaft (12), a cam member (20) and followers (16) for converting rotational motion into reciprocal motion, and a shroud (24) having a cuttin... | 08/12/2008 |
| 7258179 | Rotary bit with an indenting member In one aspect of the invention a drill bit assembly has a body portion intermediate a shank portion and a working portion. The working portion has a recess with a side wall which is substantially coaxial with the shank portion. At least one cutting element is attach... | 08/21/2007 |
| 7137458 | Impact mechanism for a hammer drill An impact mechanism for a hammer drill, which has a housing and a drill bit protruding outside the housing, is provided. The mechanism includes firstly an impact platform within the housing; the impact platform is in connection with the drill bit for receiving impac... | 11/21/2006 |
| 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 |
| 7111692 | Apparatus and method to reduce fluid pressure in a wellbore The present invention generally provides apparatus and methods for reducing the pressure of a circulating fluid in a wellbore. In one aspect of the invention an ECD (equivalent circulation density) reduction tool provides a means for drilling extended reach deep (ER... | 09/26/2006 |
| 7104344 | Percussion drilling head Device and method for drilling into geological formations. The device comprises: a rotatable body; drilling cutters arranged on an axial end surface of the rotatable body; a percussion part, which ... | 09/12/2006 |
| 7066247 | Methods and apparatus for drilling with a multiphase pump The present invention generally relates to an apparatus and method for removing hydrocarbons and other material from a wellbore. In one aspect, a method of drilling a sub-sea wellbore is provided. The method includes circulating a drilling fluid through a drill stri... | 06/27/2006 |
| 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 |
| 7011156 | Percussion tool and method A percussion apparatus and method of using the percussion apparatus. The apparatus may be used for delivering an impact to a tubular string. The apparatus comprises a cylindrical member having an internal bore containing an anvil and a first guide profile. The appar... | 03/14/2006 |
| 6968898 | System and method for removing particles from a well bore penetrating a possible producing formation A system and method for removing particles from a well bore penetrating a possible hydrocarbon producing formation, according to which drilling fluid is mixed with a weighted material, and the mixture is introduced into a well bore so that the mixture scours any par... | 11/29/2005 |
| 6209662 | Method of and apparatus for controlling diamond drill feed Apparatus for controlling a diamond drill feed cylinder which includes a linear position sensor coupled to the feed cylinder for generating a position signal, a positioning module for generating a feed control signal in dependence upon the position signal... | 04/03/2001 |
| 6082453 | Orientation device, particularly for drilling tool or a well equipment An orientation device, particularly for drilling tools, of the kind comprising a first sleeve (1) and a concentrically surrounding second sleeve (2), where in an annulus between the sleeve (1) and the sleeve (2) is disposed an axially displaceable carrier... | 07/04/2000 |
| 5404959 | Drill rig safety shutdown device A safety shutdown system for a rotary drill rig with a power supply, a support frame and a rotary drill spindle and drill tool connected to the support frame. The drill spindle and tool are driven by a drive train that is connected by a clutch with a decl... | 04/11/1995 |
| 4889194 | Method and a device for deep hole drilling A device for drilling deep holes in the ground has at least two axial drill bits and an equal number of plates each having three shafts axially interconnecting the plates. Two of the shafts are rigidly attached to both plates and the third shaft is pivota... | 12/26/1989 |
| 4627501 | Borer head with planetary gearing In a borer head for drilling boreholes in rock structures and including a drive shaft connected to a drive of a drilling machine, a central shaft coupled to the drive shaft, and a tool holder with cutters driven by a planetary gearing connected to the cen... | 12/09/1986 |
| 4441761 | Mining machine A mining apparatus which is adapted to be connected to a sectioned powered auger conveyor assembly and driven by the central shaft of the auger is constructed with its housing divided into a cutting section and an attachment section. A drive shaft is rota... | 04/10/1984 |
| 4368787 | Arrangement for removing borehole cuttings by reverse circulation with a downhole bit-powered pump An arrangement for drilling deviated wellbores, such as in extended reach drilling, which is particularly designed to reduce the chance of pressure-differential sticking of the drill string by removing the drilling cuttings from the wellbore bottom by rev... | 01/18/1983 |
| 4289210 | Impact drill bit actuator A rotary drive member such as a drill string, has a housing rotatably mounted at its lower end and an axial-throw cam is fixed at the lower end of the drive member in the housing. Chisel blades are axially slidable in the housing and are reciprocated by t... | 09/15/1981 |
| 4159149 | Coal mining auger A coal-mining auger having (a) a hollow, tubular auger head with a spiral or helical coal conveyor mounted therein in concentric relation to the axis of rotation of said auger head, (b) a plurality of coal-cutting bits mounted on said auger head, said bit... | 06/26/1979 |
| 4117897 | Drill bit A drill bit comprising a body suspended in a well bore by an electrical cable which transmits power to a motor secured to the body and eccentric cam member rotated by the drive shaft of the motor and engagable with a plurality of reciprocal drill pins whe... | 10/03/1978 |
| 3945445 | Boring apparatus provided with drill bits freely rotatable around their own axis A boring apparatus in which a plurality of drill bits are supported in a casing fixed to a boring pipe in such a manner that these bits are axially substantially parallel with the axis of the boring pipe and are freely rotatable around their own axis inde... | 03/23/1976 |
