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| Number | Title | Issue Date |
| 8151907 | Dual motor systems and non-rotating sensors for use in developing wellbores in subsurface formations A method for forming a subsurface wellbore is disclosed. The method includes operating a drilling string in a first direction of rotation. A first motor located near the end of the drilling string is operated in a direction of rotation opposite that of the drilling ... | 04/10/2012 |
| 7293615 | Earth boring system An earth boring apparatus for sinking shafts and removing shaft material from the shaft, the apparatus having at least two decks; hydraulic means for allowing movement of the decks relative to one another; releasable anchoring means associated with the decks for eng... | 11/13/2007 |
| 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 |
| 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 |
| 6923273 | Well system The drilling system includes a work string supporting a bottom hole assembly. The work string including lengths of pipe having a non-metallic portion. The work string preferably includes a composite coiled tubing having a fluid impermeable liner, multiple load carry... | 08/02/2005 |
| 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 |
| 6571888 | Apparatus and method for directional drilling with coiled tubing An improved coiled tubing directional drilling method comprises: providing a bent housing which is rotatably coupled to the coiled tubing, rotating the drill bit, and rotating the bent housing. Apparatus for achieving the method comprises: a rotary connec... | 06/03/2003 |
| 6364038 | Downhole flexible drive system Improvements for a downhole flexible drive system for drilling high angle well holes or curved holes from the vertical to the horizontal with an ultra short radius to drill a horizontal drain hole. The improvements include a flexible shaft that connects t... | 04/02/2002 |
| 5778992 | Drilling assembly for drilling holes in subsurface formations A drilling assembly for drilling holes in subsurface formations comprises a drill bit 10, a drive unit 12 including a housing and a rotor 11 operatively coupled to the drill bit to rotate the drill bit relative to the housing, and a modulated bias unit 14... | 07/14/1998 |
| 5697459 | Directional self-propelled drill A self-propelled drill for drilling a bore or cleaning a pipe in straight and/or curved paths. The drill includes a piston having a working head which slides within a housing. A rotary piston driving mechanism featuring an endless groove converts longitud... | 12/16/1997 |
| 5620056 | Coupling for a downhole tandem drilling motor The tandem drilling motor includes an upper power section comprised of an upper rotor and stator and a lower power section comprised of a lower rotor and stator. A connector having a flowbore therethrough has one end attached to one end of the upper rotor... | 04/15/1997 |
| 5096000 | Process and apparatus for laying service lines without excavation In a process for laying underground service lines without excavation by means of a ram boring machine, old pipe lines already buried underground are replaced by new service lines without having to tear up the ground or destroy the old pipe line. To enable... | 03/17/1992 |
| 4607980 | Apparatus for compacting soil, concrete and like materials An apparatus for compacting soil includes a tamping shoe with anvils, a reaction mass with an anvil and an impact mechanism comprising a crank gear installed in a casing and having hammer rams which are oppositely directed and which are coaxial with the a... | 08/26/1986 |
| 4314615 | Self-propelled drilling head A self-propelled drilling head comprises a base section including gripper shoes mounted for extension and retraction to selectively grip the wall of a hole being drilled. A first actuator is provided for extending and retracting the gripper shoes. A drill... | 02/09/1982 |
| 4304309 | Surface drilling apparatus A surface drilling apparatus for drilling large diameter holes in soft to medium-hard earth formations includes a cylindrical casing defined by a stationary upper section and a lower section rotatable relative to the upper section; a plurality of circular... | 12/08/1981 |
| 4227584 | Downhole flexible drive system An improved downhole system for operating a drill bit around a small radius of bend in the directional drilling of curved holes from a vertical well hole in an oil or gas formation. The system is comprised of a plurality of double shaft downhole motors as... | 10/14/1980 |
| 4143722 | Downhole flexible drive system An improved downhole system for operating a drill bit around a small radius of bend in the directional drilling of curved holes from a vertical well hole in an oil or gas formation. The system is comprised of a plurality of double shaft downhole motors as... | 03/13/1979 |
| 4098359 | Hydraulically operated downhole motor A hydraulic motor for use in a drill string is disclosed. The motor incorporates a closed hydraulic system having a piston exposed to variations in mud flow pressure. The piston reciprocates and by its movement pumps hydraulic fluid in a closed hydraulic ... | 07/04/1978 |
| 4047581 | Multistage, downhole, turbo-powered intensifier for drilling petroleum wells A turbine-powered intensifier assembly is a part of a drill collar and attaches to the downhole end of a drill string. A drilling mud stream from the drill string branches. One branch is cleaned of solid matter by centrifugal cleaners. The clean fluid dri... | 09/13/1977 |
| 3941423 | Method of and apparatus for extracting oil from oil shale Method of and apparatus for extracting oil from oil shale. An excavating unit is driven by supplying steam to a plurality of steam engines mounted in an annulus between stationary outer and inner casings. A hollow center column and apertured screw vane ar... | 03/02/1976 |
