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| Number | Title | Issue Date |
| 7798251 | Circulation system for retrieval of bottom hole assembly during casing while drilling operations During casing-while-drilling, drilling fluid is pumped through a conduit leading to a flow passage a casing string gripper and down the casing string. A bottom hole assembly is mounted at a lower end of the casing string for drilling a wellbore. The bottom hole asse... | 09/21/2010 |
| 7770669 | Auger and hole stabilization combination system An auger and hole stabilization combination system includes an auger bit that has a bottom end, a top end, and at least one boring blade positioned between the top and bottom ends. A cylinder has an upper end and a lower end. The cylinder has an inner diameter great... | 08/10/2010 |
| 7766101 | System and method for making drilling parameter and or formation evaluation measurements during casing drilling A casing drilling system includes a casing having a drill bit at one end. The drill bit is capable of drilling subsurface formations and formed from a material removable by drilling or chemical exposure. The chemical is substantially harmless to the casing. The syst... | 08/03/2010 |
| 7637330 | Casing bottom hole assembly retrieval process A process for retrieving a bottom hole assembly through a casing string may include: installing a casing string in a borehole, the casing string including a bottom hole assembly releasably engaged thereto and moveable through an inner diameter of the casing string; ... | 12/29/2009 |
| 7520343 | Retrievable center bit A retrievable center bit for use with a tubular including an inner bore and a drill shoe cutter mounted thereon. The retrievable center bit may include a body positionable in the bore of the tubular and including an upper end, a lower end and a side outer surface ex... | 04/21/2009 |
| 7416036 | Latchable reaming bit A drilling assembly supports a liner for making a wellbore. The BHA comprises a pilot bit and a reamer above it that is larger in diameter than the suspended liner. If the BHA needs to be pulled out, the reamer is brought into contact with the liner and a latch mech... | 08/26/2008 |
| 7413035 | Reusable auger barrel An apparatus that facilitates the insertion of a stanchion into the ground. The apparatus comprises a first side including a plurality of connection apertures, a second side including a plurality of connection apertures, and at least one connector engaging the conne... | 08/19/2008 |
| 7367412 | Collapsible rock head A rock head for use with an auger borer to bore a passageway through a body of soil and rock and simultaneously laying a pipe in that bored passageway. The rock head has a base connectable to the leading end of the auger. A plurality of movable mounts are provided o... | 05/06/2008 |
| 7287609 | Drilling a borehole A method of drilling a borehole into a subsurface earth formation, using a tubular drill string which includes at its lower end a bottom hole assembly comprising a drill bit, a drill steering system, and a surveying system. The drill string includes a selectively cl... | 10/30/2007 |
| 7275594 | Stab guide A tool string stab guide for axially aligning first tool string components with second tool string components is disclosed. The stab guide has a body with an axial length along a longitudinal axis with a first and a second section. The first section of the body adap... | 10/02/2007 |
| 7188672 | Well string assembly A well string assembly includes an upper tubular well string part having upper and lower ends between which there is formed a passageway, a lower well string part having upper and lower ends, which lower end is spaced apart from the lower end of the upper well strin... | 03/13/2007 |
| 7182156 | System for overburden drilling The present invention provides a global drilling system comprising a crown bit, a driver drill bit and a square drill bit. The crown bit has a tubular body with an inner surface and an outer surface, wherein the inner surface circumscribes a hollow passageway, and a... | 02/27/2007 |
| 7143846 | Method for drilling and drilling apparatus to enable reverse circulation The invention relates to a method for drilling, being carried out by a drilling apparatus, having a drilling device (1) that comprises a casing part (2) and a drilling unit (3), in the drilling head (I) of which there are first drilling means ( | 12/05/2006 |
| 7108084 | Methods and apparatus for cementing drill strings in place for one pass drilling and completion of oil and gas wells The steel drill string attached to a drilling bit during typical rotary drilling operations used to drill oil and gas wells is used for a second purpose as the casing that is cemented in place during typical oil and gas well completions. Methods of operation are des... | 09/19/2006 |
| 7066270 | Multilateral reference point sleeve and method of orienting a tool A multilateral reference point sleeve includes a tubular member configured to be received in a tubing string of a wellbore. The tubular member has an uphole end and a downhole end. The uphole end is angled to define an orientation profile, and the orientation profil... | 06/27/2006 |
| 7055626 | Core bit having features for controlling flow split A core bit for cutting core samples in subterranean formations. The core bit has interior geometric features configured to control the quantity of drilling fluid, or flow split, flowing into a narrow annulus defined by an inside diameter of the core bit and an outsi... | 06/06/2006 |
| 6962215 | Underbalanced well completion Equipment and methods which may be used in conjunction with an underbalanced well completion. In a described embodiment, a valve for use in a subterranean well in conjunction with a tool conveyed through the valve in a container is provided. The valve includes a pas... | 11/08/2005 |
| 6722454 | Device for drilling, in particular percussion drilling or rotary percussion drilling, boreholes A device for drilling holes, including a drill bit with a drilling or breaking surface, a drill rod for introducing a rotary or percussive force and for introducing a rinsing or cooling fluid into the drill bit and a sheath pipe which defines a hollow space between ... | 04/20/2004 |
| 6659204 | Method and apparatus for recovering core samples under pressure A pressure and temperature core sampler comprises a tool for recovering cores specifically enabling the evaluation of methane hydrate resources. Because methane hydrate tends to decompose under conditions of pressure decrease and/or temperature increase a... | 12/09/2003 |
| 6640911 | Device for connecting a tool to a drive A device for connecting a tool to a mechanical drive contains as the coupling element a spring washer coupling or clutch, which is made in one piece from metal and at least in the rotation direction has a limited resilience. Use is made thereof for preven... | 11/04/2003 |
| 6536993 | Pile and method for installing same An apparatus for providing a mooring anchorage, and a method of drilling and installing a pile in ground comprising the steps of: providing a pile, providing a drill bit at an end of the pile rotatable relative to the pile, engaging the ground with the drill bit, a... | 03/25/2003 |
| 6513598 | Drillable floating equipment and method of eliminating bit trips by using drillable materials for the construction of shoe tracks A one trip method for drilling a wellbore below a cemented casing is disclosed. An apparatus for use in performing the method is also disclosed. The method comprises lowering a drill bit into a casing cemented in the wellbore. The casing has float equipme... | 02/04/2003 |
| 6378631 | Apparatus for recovering core samples at in situ conditions A pressure and temperature core sampler comprises a tool for recovering cores specifically enabling the evaluation of methane hydrate resources. Because methane hydrate tends to decompose under conditions of pressure decrease and/or temperature increase a... | 04/30/2002 |
| 6374924 | Downhole drilling apparatus A downhole drilling apparatus for interconnection in a casing or liner string having a drill bit disposed thereon for enabling the drilling of intersecting wellbores without removal of the drill bit is disclosed. In a disclosed embodiment, the apparatus c... | 04/23/2002 |
| 6368021 | Pile and method for installing same A method of drilling and installing a pile in ground comprising the steps of providing a pile, providing a drill bit at an end of the pile rotatable relative to the pile; engaging the ground with the drill bit, and rotating the drill bit relative to the ground and ... | 04/09/2002 |
| 6230825 | Apparatus for recovering core samples under pressure A pressure and temperature core sampler comprises a tool for recovering cores specifically enabling the evaluation of methane hydrate resources. Because methane hydrate tends to decompose under conditions of pressure decrease and/or temperature increase a... | 05/15/2001 |
| 6206114 | Tool for transporting cutting means to and from a ground drill A down hole running tool 14 travels in a first direction through a drill pipe for installing bit segments 18 at the end of a drive sub 12 attached to the drill pipe. The tool 14 includes a first portion 82 and a second portion 84 which is retractably coup... | 03/27/2001 |
| 6196336 | Method and apparatus for drilling boreholes in earth formations (drilling liner systems) A drilling liner having a core bit at its bottom end is carried along with a pilot bit on an inner bottom hole assembly driven by a downhole mud motor. In one embodiment, the motor is powered by mud carried by an inner string. Alternatively, the inner str... | 03/06/2001 |
| 6173796 | Sleeve for orientating a tool A sleeve (10) comprises a cylindrical member (12) provided at one end (14) with a pair of opposing tapered peaks (16) and (18). Peak (16) is higher (longer) than peak (18). Sleeve (10) is retained within a drive sub (26) of a ground drill and is constrain... | 01/16/2001 |
| 6155360 | Retractable drill bit system A retractable drill bit system for a ground drill includes drill bit assembly, a bit assembly sleeve, and a transport member. The drill bit assembly is engagable with a drive sub attached to the bottom of the ground drill with the drill bit assembly being... | 12/05/2000 |
| 6106200 | Process and device for simultaneously drilling and lining a hole In a process for drilling, in particular rotary percussion or percussion drilling, and lining holes in the ground or rocks, a hole is percussion and/or rotation drilled by a cutter mounted on boring rods and a lining is formed by a jacket tube. During dri... | 08/22/2000 |
| 6059053 | Retraction system for a latching mechanism of a tool A retraction system allows disengagement of retrieval latch dogs of a down hole running tool from a bit locking sleeve. The locking sleeve is slidably retained within a drive sub and includes a pair of slots which are engaged by the retrieval latch dogs w... | 05/09/2000 |
| 6006844 | Method and apparatus for simultaneous coring and formation evaluation A core barrel having an inner tube for coring and, alternately, a center plug assembly for closing the throat of the core bit at the bottom of the assembly for drilling in lieu of coring. The inner tube assembly and plug assembly are disposable and retrie... | 12/28/1999 |
| 5957225 | Drilling assembly and method of drilling for unstable and depleted formations A method and liner assembly for drilling into unstable or depleted formations is provided that maintains control of the wellbore against caving such as where unconsolidated formations are penetrated and/or minimizes fluid losses such as to underpressured ... | 09/28/1999 |
| 5954146 | System for in situ replacement of cutting means for a ground drill A retractable drill bit system 10 comprises a drive sub 18 which is adapted for connection to a lower end of a drill 12, a tool 20 for installing and retracting drill bit segments 22 from the drive sub 18; and an insert 24 for selectively locking the bit ... | 09/21/1999 |
| 5950742 | Methods and related equipment for rotary drilling Methods and related equipment for drilling a wellbore in subterranean formations whereby a drill bit is attached to one end of a first conduit string, such as a casing string which is not usually used for drilling, and advancing the first conduit string a... | 09/14/1999 |
| 5845722 | Method and apparatus for drilling boreholes in earth formations (drills in liner systems) A method of sinking a bore hole in underground formations which have at least one special stratiform formation which features vastly differing formation pressures in respect to a formation adjacent to it in the sinking direction and in which a drilling to... | 12/08/1998 |
| 5711385 | Augerless boring system An augerless boring system uses a relatively slender drill steel pipe attached at a front end to a large tubular hammer. The hammer holds different drill bits. The drill steel and the hammer are located inside a casing and driven along with the casing by ... | 01/27/1998 |
| 5590726 | Drilling apparatus A drilling apparatus adapted to be fed into a hole to be drilled and extendable in a longitudinal direction includes a casing and a drilling unit. A drilling head of the drilling unit includes a first drilling unit for drilling a center hole and a second ... | 01/07/1997 |
| 5542483 | Method for overburden drilling, casing shoe and casing tube for the method, and coupling element for the casing tubes When drilling in soil and simultaneous loading of casing tube, it is desirable to be able to use casing tubes of plastic material such as PEH-plastic. This is made possible by a special design of a casing shoe giving a strong joint between the casing shoe... | 08/06/1996 |
