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| Number | Title | Issue Date |
| 7967084 | External water delivery system for rock drills An external water delivery system includes a water box front head, a collet configured to interface with the water box front head, a polymer sleeve configured to be positioned between the water box front head and the collet, a shank, and at least one seal positioned... | 06/28/2011 |
| 7395877 | 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... | 07/08/2008 |
| 7357198 | Downhole apparatus The invention relates to apparatus for use in wellbores and particularly, but not exclusively, to circulating subs used during downhole drilling operations. The apparatus includes a control groove and a pin received within the control groove for determining whether ... | 04/15/2008 |
| 7334633 | Stripper rubber adapter A connector is provided for selectively connecting or disconnecting a stripper rubber to or from drilling head equipment such as a bearing assembly. A generally cylindrical adapter connected to the equipment defines a primary bore accommodate a down hole tubular. On... | 02/26/2008 |
| 7308954 | Rotating diverter head A rotating diverter head for use on a blow out preventer stack of an oil, gas or geothermal well. While providing for sealing and rotation of a drill pipe through the head, the head additional includes a flange on which the head is rotatable. The flange connects the... | 12/18/2007 |
| 7306032 | Fluid collecting device An adjustable fluid collecting device with two shells pivotally movable relative to each other wherein the fluid collecting device is movable between an open position in which the shells are distanced from each other and a closed position in which the shells touch, ... | 12/11/2007 |
| 7299866 | Apparatus and method for cleaning out sand from an underbalanced hydrocarbon producing well An apparatus and method is used in the cleaning out of sand in underbalanced gas wells. The present invention includes a valve subassembly equipped with an emergency shutin device to remotely control the actuation of the valve via an air or hydraulic control line. O... | 11/27/2007 |
| 7243958 | Spring-biased pin connection system A connection system is described for connecting parts of an apparatus. A first part having one or more pin receptacles cooperatively mates to a second part housing one or more spring-biased pin assemblies to provide a fluid-tight seal. The second part further provid... | 07/17/2007 |
| 7213660 | Washpipe seal A controlled leakage seal assembly having a first stationary portion adapted to be connected in substantially fluid-tight relation to a source of drilling fluid and a second portion adapted to be connected in substantially fluid-tight relation to a rotary portion in... | 05/08/2007 |
| 7174956 | Stripper rubber adapter A connector is provided for selectively connecting or disconnecting a stripper rubber to or from drilling head equipment such as a bearing assembly. A generally cylindrical adapter connected to the equipment defines a primary bore to accommodate a down hole tubular.... | 02/13/2007 |
| 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 |
| 7090036 | System for drilling oil and gas wells by varying the density of drilling fluids to achieve near-balanced, underbalanced, or overbalanced drilling conditions A system for controlling drilling mud density at a location either at the seabed (or just above the seabed) or alternatively below the seabed of wells in offshore and land-based drilling applications is disclosed. The present invention combines a base fluid of lesse... | 08/15/2006 |
| 7080685 | High pressure rotating drilling head assembly with hydraulically removable packer The present invention generally provides a reduced downtime maintenance apparatus and method for replacing and/or repairing a subassembly in sealing equipment for oil field use. The invention allows the removal of rotating portions of a rotary drilling head without ... | 07/25/2006 |
| 7040408 | Flowhead and method A flowhead for a well testing system is disclosed. The well testing system comprises a plurality of threaded connection pipes extending from the surface to a subterranean zone of interest which is isolated for testing purposes. Fluid flows from the subterranean zone... | 05/09/2006 |
| 6796390 | Method and device for moving a tube in a borehole in the ground A tube (1) in a borehole (2) in the ground (3) is displaced. The tube is simultaneously displaced along and about its axis, such that it is axially introduced into or retracted from the borehole. According to the invention, displacing the compos... | 09/28/2004 |
| 6450262 | Riser isolation tool Two types of isolation tools are disclosed for installation between the upward end of the LMRP and the lower end of a riser string in the drilling of a subsea well using dual gradient techniques, one of which is especially adapted for rotation about a rot... | 09/17/2002 |
| 6325159 | Offshore drilling system A system for drilling a subsea well from a rig through a subsea wellhead below the rig includes a wellhead stack which is mounted on the subsea wellhead. The wellhead stack includes at least a subsea blowout preventer stack and a subsea diverter. A drill ... | 12/04/2001 |
| 6230824 | Rotating subsea diverter A rotating diverter for isolating fluid in a well from other fluid above the well is provided. The rotating diverter includes a housing body which has a bore running through it. A retrievable spindle assembly which includes a spindle and a bearing assembl... | 05/15/2001 |
| 6138774 | Method and apparatus for drilling a borehole into a subsea abnormal pore pressure environment An apparatus for controlling a subsea borehole fluid pressure is proposed for use with a conductor casing positioned below the mudline and within a normal pore pressure environment. The apparatus includes a pump for moving a fluid through a tubular into a... | 10/31/2000 |
| 6105692 | Swivel chamber for water actuated wireline drills A swivel chamber that streamlines the procedure for retrieving core samples from a wireline diamond core drill. The swivel chamber includes a housing, a rotary seal, overshot and wire cable packing. The swivel chamber is threaded at one end for attachment... | 08/22/2000 |
| 5785131 | Pressurized formation sample collection A borehole drilling apparatus has a jacket attachable to a well head and through which a drill rod passes and which carries pressurized drilling fluid to a working end of the drill rod and out into an annulus of the borehole. The jacket has a drill rod se... | 07/28/1998 |
| 5101913 | Method and apparatus for drilling wells Method and apparatus for drilling wells in which the annulus between the casing and drill string is sealed below the kelly and blowout preventers and drilling fluid returns are conducted from below the seal to the exterior through the drilling head. The a... | 04/07/1992 |
| 5092717 | Device for making a drilled hole with an undercut The device for producing a drilled hole with an undercut includes a drilling tool having a shank and a drilling head faced with a plurality of diamond chips, a drilling tool-holder structured to hold the drilling tool and a rotatable sleeve having an axia... | 03/03/1992 |
| 5037250 | Rotary tool holder A rotary tool holder of the type including a stationary shell adapted to be reciprocally positioned within a bushing plate and a shaft mounted rotatably within the stationary shell. An annular space is provided between the shaft and the shell and the shel... | 08/06/1991 |
| 4949796 | Drilling head seal assembly There is disclosed an improved drilling head which provides for the formation of a continuous seal about a drilling string, where the drilling string consists of varying diameter drill string components. A stationary bowl configured to pass a drill string... | 08/21/1990 |
| 4889196 | Diverter apparatus A diverter apparatus for use in conjunction with earth drilling operations to divert cuttings from the area surrounding the bore hole, and including a pneumatically extensible and retractable ground-engaging skirt which surrounds the bore hole.... | 12/26/1989 |
| 4640372 | Diverter including apparatus for breaking up large pieces of formation carried to the surface by the drilling mud A diverter for drilling mud is disclosed that has a packer housing mounted on the upper end of a riser through which drilling mud flows to the surface between the riser and the pipe string extending through the riser. A packer having a body of resilient m... | 02/03/1987 |
| 4585256 | Side feed water swivel A side feed water swivel for a hollow drill string includes a spindle one end of which is adapted to fit a socket on a rotary table of a drill rig, and the other end, to connect to hollow drill rods, and, intermediate its ends, a receiving section having ... | 04/29/1986 |
| 4500094 | High pressure rotary stripper A rotating blowout preventor having only one moving part which cooperates with an upper bushing to provide resistance to upthrust and downthrust. The apparatus includes provisions for interaction to occur between the rubber of the stripper and the inside ... | 02/19/1985 |
| 4440243 | Drill cuttings conveying head with wet cuttings diverter A drill cuttings conveying head member having a tubular duct portion which includes a movable sidewall forming a gate operable to be pivoted into a position blocking the flow passage in the duct portion and diverting the flowstream out of the conveying he... | 04/03/1984 |
| 4434861 | Dust conveying and collecting system and method A conveying and collection system adapted for drilling rigs for conveying drill cuttings entrained with a bailing air flow stream emanating from the drillhole includes a generally tubular head fitted around the drillhole having a flow deflecting surface p... | 03/06/1984 |
| 4428421 | Wireline winch mounting system A wireline apparatus and method has features that prevent the wireline from moving with respect to the drill string due to drill string movement or wave action on the drill rig. The apparatus includes a frame having a wireline pressure sealing device. The... | 01/31/1984 |
| 4357992 | Fluid pressurization apparatus and technique The apparatus and technique are applicable to fluid pressurizing a portion of an elongated hole in the ground when a hollow tubular fluid transmission member is installed lengthwise therein. According to the technique, inflatable closure means are install... | 11/09/1982 |
| 4312404 | Rotating blowout preventer Improved rotating blowout preventer including a stationary housing, a bearing housing and a bearing means assembly and seal assembly for mounting an internally located, rotating sleeve for rotating, sealable movement within the bearing housing. The bearin... | 01/26/1982 |
| 4295536 | Pressure seal for pumping instruments through drill rod A device for placement between a rotary drill motor and a drill rod for use in pumping instruments down the drill rod. The device has pressure seals at each end and an opening for an instrument cable which slides through the opening as the instruments are... | 10/20/1981 |
| 4281724 | Drilling head A drilling head includes a tubular body having removable means for sealing the body to a kelly or other drive tube, a drive bushing releasably mounted in the sealing means to turn the sealing means with the drive tube, the sealing means including a seal t... | 08/04/1981 |
| 4208056 | Rotating blowout preventor with index kelly drive bushing and stripper rubber A rotating blowout preventor having a special stripper rubber with reinforcement means incorporated therein in indexed relationship with a kelly drive bushing so that when the kelly is telescopingly received through the rotating blowout preventor, the cor... | 06/17/1980 |
| 4157186 | Heavy duty rotating blowout preventor A heavy duty rotating blowout preventor which has a main outer support housing by which it can be affixed to the uppermost end of a casing, or to the uppermost end of a stack of tools affixed to the upper end of a casing. A rotating seal assembly includes... | 06/05/1979 |
| 3985367 | Wet drilling system Apparatus for underground drilling includes a housing having a bottomed opening in its top and a hole extending downwardly through the housing from the opening. A rotatable chuck is received in the opening and has a vertical bore therethrough with non-cir... | 10/12/1976 |
