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| Number | Title | Issue Date |
| 7882906 | Up-down vibratory drilling and jarring tool A drilling and vibratory jarring device is provided. The device has an inner mandrel shiftable upward or downward in an outer housing from an intermediate position in the outer housing. When the inner mandrel is in the intermediate position within the outer housing ... | 02/08/2011 |
| 7234544 | Drill tool shaft-to-housing locking device In a tool having an inner member supported within an outer member, wherein the tool defines a longitudinal axis, a device is provided for preventing relative rotation of the inner member and the outer member. The device is comprised of a locking mechanism and a lock... | 06/26/2007 |
| 7017682 | Drill string shutoff valve A valve assembly connects into a drill string for opening and closing a passage within the drill string. The valve assembly has an inner valve member for opening and closing an inner passage of the drill string. The valve member moves between the open and closed pos... | 03/28/2006 |
| 6981560 | Method and apparatus for treating a productive zone while drilling A method and apparatus for delivering a well treatment fluid to a productive zone of a subterranean formation at the same time that a well bore is being drilled is provided. The method includes the steps of delivering a drill-in fluid to a drill bit drilling a well ... | 01/03/2006 |
| 6896060 | Downhole jarring tool adjuster A downhole jarring apparatus including a shaft and a first mandrel configured to releasably engage, a collar operatively attached to the shaft such that an axial position of the collar relative to the shaft is adjustable by access through an opening in an outer surf... | 05/24/2005 |
| 6866096 | E-line downhole jarring tool According to the present invention, the e-line downhole jarring tool is an electrical line downhole tool for manipulating a work string which is easily configured to deliver a specific amount of force to the work string in a small and simple apparatus. ... | 03/15/2005 |
| 6745836 | Down hole motor assembly and associated method for providing radial energy The down hole motor is a self-contained radial drive unit that is driven by a linear input, which can be supplied from various sources. As linear motion is applied to the input of the tool, drive pins on a drive shaft follow a helical path, converting the linear mot... | 06/08/2004 |
| 6705415 | Directional drilling apparatus In a directional drilling apparatus in which a sensor/transmitter or sonde is located in one section of a drill string and an element of an adjacent section is configured to “steer” the bore drilled in a predetermined lateral direction, a device is provided for ... | 03/16/2004 |
| 6702040 | Telescopic drilling method A telescopic drilling method includes the steps of drilling an outer bore through a surface, inserting a hollow outer conduit into the outer bore, and at least partially inserting a first hollow inner conduit through the outer conduit. Next, the method in... | 03/09/2004 |
| 6516903 | Drill bit stabilizer device A stabilizing sleeve device for an impact drill bit used in underground drilling operations. The cylindrical tubular device has arcuate keys on a bottom edge for interlocking with keyways in the shoulder of a hammer drill bit and a locking key groove in i... | 02/11/2003 |
| 6397957 | Jacket tube for a drilling and anchoring device A jacket tube for a device for drilling holes and forming an anchorage in the earth or rock. The jacket tube is coupled with a drill pipe and/or a drill bit or a drill hammer and is configured with a plurality of through openings across its periphery. Onc... | 06/04/2002 |
| 6357538 | Bit torque limiting device A torque limiting device that allows a drill string to rotate relative to the cutting structure of the bit when a predetermined torque is applied between the cutting structure of the drill bit and the drill string. The torque limiting device utilizes a re... | 03/19/2002 |
| 6182774 | Bit torque limiting device A torque limiting device that allows a drill string to rotate relative to the cutting structure of the bit when a predetermined torque is applied between the cutting structure of the drill bit and the drill string. The torque limiting device utilizes a re... | 02/06/2001 |
| 6082457 | Method of using a drill string tool A method of operating a drill string tool for use in a wellbore formed in an earth formation is provided. T he method comprises rotating an upper drill string part while a rotation transfer assembly transfers the rotation of a first element to a second el... | 07/04/2000 |
| 5947214 | BIT torque limiting device A torque limiting device that allows a drill string to rotate relative to the cutting structure of the bit when a predetermined torque is applied between the cutting structure of the drill bit and the drill string. The torque limiting device utilizes a re... | 09/07/1999 |
| 5778993 | Locking a sample tube in a downhole hammer A common problem with reverse circulation downhole hammers is retention of the sample tube that extends through the actual hammer component., There is a tendency for the sample tube to become loose in its mounting, and the resulting movement through vibra... | 07/14/1998 |
| 5407021 | Down-the-hole hammer drill having reverse circulation A down-the-hole hammer drill having a reverse circulation system which conducts pressurized air downwardly to a lower cutting face of a drill bit. The air travels across the cutting face and upwardly through a central exhaust passage. The air is conducted... | 04/18/1995 |
| 5010965 | Self-propelled ram boring machine In a self-propelled ram boring machine, in particular for making earth bores, having a striking tool at the leading end of a cylindrical housing, a striking piston movable to subject said striking tool to ramming blows, said striking piston being driven w... | 04/30/1991 |
| 5005656 | Device in impact machines Device in impact machines. The device comprises a number of rods (6) provided with projections (51). The rods are journalled in a surrounding set of tubes (7) by means of elastic bushings (52,53) which are provided with grooves (57) through which said pro... | 04/09/1991 |
| 4745983 | Bit seat protector device for drilling systems or the like The present invention relates to a seat protector device of the type which may be employed with drill rods for transmission of thrust from a driving member to a driven member. More specifically, the invention relates to an improved drill rod system for ea... | 05/24/1988 |
| 4665998 | Mechanical well jar A mechanical well jar is disclosed having inner and outer tubular members movable longitudinally relative to each other a limited distance for connecting in a pipe string. Annular shoulders on the members engage to limit the relative longitudinal movement... | 05/19/1987 |
| 4573536 | Method and apparatus for flushing a well A method and apparatus for flushing a well involves the use of a tool which enables a certain jarring displacement to cause a flush valve to be opened. Rotary oscillation of a stem in a given direction may be converted by a ratchet mechanism into rotation... | 03/04/1986 |
| 4452307 | Reamer A reamer for removing paraffin, scale, ice and other accumulations from the inside surfaces of oil well pump tubing and casing and loosening tubing in a well, which includes a hollow shell or housing having a tapered base, which in a preferred embodiment ... | 06/05/1984 |
| 4408670 | Impact cam subassembly for drills A sub assembly to be inserted between a drill string and a bit has a stabilizer sleeve to engage the walls of a bore hole and hold a first cam against rotation. A second cam is fixed to a drill holder at the lower end of the assembly and is driven in rota... | 10/11/1983 |
| 4210316 | Drill string shock absorber with improved pin type torque transmission means A shock absorbing apparatus for use in an earth boring drill string is disclosed herein. The shock absorber is of the type having a mandrel reciprocally mounted for rotation with a tubular body; a sealed chamber between the tubular body and the mandrel co... | 07/01/1980 |
