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| Number | Title | Issue Date |
| 7331581 | Inflatable packers Improved inflatable packers are provided. A packer may be constructed from hybrid structures including slat structures and weave structures. A packer may include a bladder and a cover, with a plurality of slats disposed therebetween, and/or a weave structure or anti... | 02/19/2008 |
| 7281592 | Injecting a fluid into a borehole ahead of the bit A method and system for introducing a fluid into a borehole, in which there is arranged a tubular drill string including a drill bit, wherein the drill bit is provided with a passageway between the interior of the drill string and the borehole, and with a removable ... | 10/16/2007 |
| 7243727 | Isolation assembly for coiled tubing An isolation assembly for use with coiled tubing is described. The isolation assembly has a check valve for providing selective fluid communication through from the coiled tubing, through the isolation assembly, and into a downhole tool, such a straddle packer. The ... | 07/17/2007 |
| 7204327 | Reverse circulation directional and horizontal drilling using concentric drill string Method and apparatus for drilling a directional or horizontal wellbore in a hydrocarbon formation using concentric drill string having an inner pipe and an outer pipe defining an annulus there between. A bottomhole assembly comprising a directional drilling means su... | 04/17/2007 |
| 7165634 | Method 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... | 01/23/2007 |
| 7147068 | 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... | 12/12/2006 |
| 7140455 | Valve method for drilling with casing using pressurized drilling fluid A valve (30), a drill string valve assembly (10) and a method of drilling using compressed fluid as a drill drilling fluid are described. The valve and valve assembly (10) may be used in order to prevent escape of compressed fluid during the tim... | 11/28/2006 |
| 7134488 | Isolation assembly for coiled tubing An isolation assembly for use with coiled tubing is described. The isolation assembly has a check valve for providing selective fluid communication through from the coiled tubing, through the isolation assembly, and into a downhole tool, such a straddle packer. The ... | 11/14/2006 |
| 7108083 | Apparatus and method for completing an interval of a wellbore while drilling An apparatus and method for completing an interval of a wellbore while drilling comprises a drill string (52) having a drill bit (30) mounted on the lower end thereof. A completion assembly (50) is positioned around a section of the drill string... | 09/19/2006 |
| 7108080 | Method and apparatus for drilling a borehole with a borehole liner A method for drilling a borehole includes; providing a drill string of drill pipe including a center bore, a distal end, a bit assembly at the distal end; hanging a liner from the drill string, thereby forming an annular space between the drill string and the liner ... | 09/19/2006 |
| 7100710 | 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... | 09/05/2006 |
| 7100713 | Expandable apparatus for drift and reaming borehole An expandable reamer shoe is provided for use with expandable casing in a borehole. The reamer shoe has a number of reaming members in the form of blades which remain closed against the body of the shoe when inserted through casing, and can then be expanded to under... | 09/05/2006 |
| 7090033 | Drill string shutoff valve A valve assembly connects into a drill string for opening and closing at least one inner passage within the drill string of the drill string. The valve assembly includes an annular valve assembly carried in an annular passage that moves between the open and closed p... | 08/15/2006 |
| 7048050 | Method 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... | 05/23/2006 |
| 7036610 | Apparatus and method for completing oil and gas wells A method of drilling and completing a wellbore in a geological formation to produce hydrocarbons from a well comprising at least the following four steps: drilling the well with a retrievable drill bit attached to a casing; removing the retrievable drill bit from th... | 05/02/2006 |
| 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 |
| 7017671 | Mud saver valve A mud saver valve being operable in conjunction with a top drive unit to retain mud in the top drive unit when a tubular is disconnected therefrom. The valve utilizes a spring-loaded piston to control the flow of mud or other fluid onto the work area and environment... | 03/28/2006 |
| 7013997 | 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... | 03/21/2006 |
| 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 |
| 6918452 | Drill string shutoff valve A valve assembly connects into a drill string for opening and closing the inner passage within the drill string. The valve member moves between the open and closed positions in response to axial movement of the drill string. The valve member has an upper portion and... | 07/19/2005 |
| 6910537 | Canister, sealing method and composition for sealing a borehole Method and composition for sealing a borehole. A chemically bonded phosphate ceramic sealant for sealing, stabilizing, or plugging boreholes is prepared by combining an oxide or hydroxide and a phosphate with water to form slurry. The slurry is introduced into the b... | 06/28/2005 |
| 6732804 | Dynamic mudcap drilling and well control system A method and an apparatus for a dynamic mudcap drilling and well control assembly is provided. In one embodiment, the apparatus comprises of a tubular body disposable in a well casing forming an outer annulus there between and an inner annulus formable between the b... | 05/11/2004 |
| 6732819 | Mudsaver valve with retrievable inner sleeve A mudsaver valve with retrievable inner sleeve. An annular piston is secured to a first end of the inner sleeve such that movement of the annular piston results in movement of the inner sleeve between a valve closed position and a valve open position. In the valve c... | 05/11/2004 |
| 6520271 | Fluid powered rotary drilling assembly A drilling fluid powered rotary drilling motor is mounted on the downhole end of a non-rotating fluid conducting drill string has a drill bit on its distal end and a plurality of fluid engaging, rotating elements coupled to at least one speed reducing pla... | 02/18/2003 |
| 6408957 | Sealed bearing roller cone bit having anti-plugging device A roller cone drill bit is disclosed which includes a bit body having at least one leg depending from the bit body. The leg has a journal formed on it at a lower end. The bit body includes an air channel extending at least from an interior of the bit body... | 06/25/2002 |
| 6318482 | Blowout preventer A blowout preventer (10; 110) adapted to be included in a drill string (11; 111) to isolate a downhole portion of an annulus (14; 114) between the drill string and a borehole wall (12; 112). The blowout preventer has a tubular body (16; 116) and an expand... | 11/20/2001 |
| 6289999 | Fluid flow control devices and methods for selective actuation of valves and hydraulic drilling tools Flow control devices and associated control methods are described for use with hydraulic tools, such as those in a drill string. The described flow control device is typically incorporated into a drill string and is selectively operable in either a flow-t... | 09/18/2001 |
| 6263987 | One pass drilling and completion of extended reach lateral wellbores with drill bit attached to drill string to produce hydrocarbons from offshore platforms The steel drill string attached to a drilling bit during typical rotary drilling operations used to drill oil and gas wells is used for the second purpose as the casing that is permanently installed in the wellbore for the final completion of oil and gas ... | 07/24/2001 |
| 6250383 | Lubricator for underbalanced drilling A system usable with a subterranean well includes a tubing and a lubricator. The tubing is adapted to receive a drill string in a passageway of the tubing, and the lubricator is located downhole and is connected to the tubing. The lubricator is adapted to... | 06/26/2001 |
| 6241032 | One-way drill string clutch The apparatus has a housing arranged to function as a length of drill string, including a fluid tight fluid conducting bore, with means at each end for connecting to a continuing drill string. The housing has two principal portions bearingly connected for... | 06/05/2001 |
| 6216799 | Subsea pumping system and method for deepwater drilling A method is disclosed for offshore drilling in which a bit is driven at a far end of a drill string, drilling fluid is injected into the drill string from surface drilling facilities, and drilling fluid passes through the far end of the drill string and f... | 04/17/2001 |
| 6209663 | Underbalanced drill string deployment valve method and apparatus Apparatus and methods for a deployment valve used with an underbalanced drilling system to enhance the advantages of underbalanced drilling. The underbalanced drilling system may typically comprise elements such as a rotating blow out preventer and drilli... | 04/03/2001 |
| 6167974 | Method of underbalanced drilling Apparatus and associated methods are provided which facilitate underbalanced drilling and completion of wells. In a described embodiment of a well control valve, the valve is opened and closed when a drill string is displaced therethrough. A shifting devi... | 01/02/2001 |
| 6158531 | One pass drilling and completion of wellbores with drill bit attached to drill string to make cased wellbores to produce hydrocarbons The steel drill string attached to a drilling bit during typical rotary drilling operations used to drill oil and gas wells is used for the second purpose as the casing that is permanently installed in the wellbore for the final completion of oil and gas ... | 12/12/2000 |
| 6152232 | Underbalanced well completion Apparatus and associated methods are provided which facilitate underbalanced drilling and completion of wells. In a described embodiment of a well control valve, the valve is opened and closed when a drill string is displaced therethrough. A shifting devi... | 11/28/2000 |
| 5979572 | Flow control tool A tool for incorporation in a drill string has an outer body (11, 12, 13) and a spool (17, 18, 19) rotationally and slidably mounted within the body. A cam groove (20) is formed on camming component (17) of the spool and interacts with pins (21) to cause ... | 11/09/1999 |
| 5894897 | Method 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 operat... | 04/20/1999 |
| 5860478 | Sub-sea test tree apparatus Apparatus and a method for killing a live well after activation of a well blowout preventer is described. This is achieved by providing apparatus in the form of a shear or kill sleeve (34) in a string (26) above a sub-sea test tree and which is located be... | 01/19/1999 |
| 5794729 | Coker unit drilling equipment In a petroleum coke operation, a pilot hole is drilled in the coke by high pressure water emitting from downwardly directed nozzles in a drilling assembly. A full hole is eroded in the coke by diverting the high pressure water to a series of full hole noz... | 08/18/1998 |
| 5645132 | Drill bit having springless check valve and method of blocking backflow during drilling A percussion drill bit includes a drill body having a fluid passage formed therein for conducting flushing fluid to a front drilling face of the drill bit. The fluid passage includes a main portion extending from a rear end of the bit and terminating shor... | 07/08/1997 |
