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| Number | Title | Issue Date |
| 7341109 | Hydraulic flow control system with an internal compensator sleeve A compensator sleeve assembly for use with a hydraulic extension system used to handle safety valves designed to shut off high pressure upward flow through drill pipe or tubing. The compensator sleeve assembly, amounted on an adjustable arm slide, has a steel sleeve... | 03/11/2008 |
| 7322407 | Wellhead isolation tool and method of fracturing a well A wellhead assembly is provided including a casing and a tubular member mounted over the casing. A flange extends from the tubular member. A generally elongated annular member is provided in the tubular member. The generally elongated annular member has a first end ... | 01/29/2008 |
| 7308943 | Well operations system A wellhead has, instead of a conventional Christmas tree, a spool tree in which a tubing hanger is landed at a predetermined angular orientation. As the tubing string can be pulled without disturbing the tree, many advantages follow, including access to the producti... | 12/18/2007 |
| 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 |
| 7290612 | Apparatus and method for reverse circulation cementing a casing in an open-hole wellbore The present invention is directed to an apparatus and method for reverse circulation cementing a casing in an open-hole wellbore. The apparatus includes a surface pack-off device, which has a housing defined by an upper section and lower section. A load bearing plat... | 11/06/2007 |
| 7275591 | Tubing hanger with ball valve in production string The invention provides a wellhead assembly including a wellhead housing supporting a tubing hanger within its central bore and forming a housing stem port through its outer wall to the central bore. The tubing hanger has a side stem port formed through its body inte... | 10/02/2007 |
| 7163064 | Surface flow valve and method A surface flow control system for a well. The system comprises a main housing having a main bore there through, and a first port communicating with the main bore. The system further comprises a first valve positioned within the main bore, and wherein the first valve... | 01/16/2007 |
| 7111687 | Recovery of production fluids from an oil or gas well A method and assembly for recovering fluids from, or injecting fluids into, a well having a christmas tree; the fluids typically flow between first and second flowpaths in a continuous path. The assembly may be located within the main bore, or a side passage of the ... | 09/26/2006 |
| 7096937 | Flow completion system A flow completion system for controlling the flow of fluid from a well bore comprises a tubing spool which includes a central bore that extends axially therethrough and a production outlet which communicates with the central bore. A tubing hanger is supported in the... | 08/29/2006 |
| 7093660 | Well operations system A wellhead has, instead of a conventional Christmas tree, a spool tree in which a tubing hanger is landed at a predetermined angular orientation. As the tubing string can be pulled without disturbing the tree, many advantages follow, including access to the producti... | 08/22/2006 |
| 7069988 | Flow completion system A flow completion system for controlling the flow of fluid from a well bore, the flow completion system comprising a tubing spool which includes a central bore that extends axially therethrough and a production outlet which communicates with the central bore; a tubi... | 07/04/2006 |
| 7062960 | Blow out preventer testing apparatus The consequences of any failure of a blow out preventer assembly to operate correctly in an emergency can be far reaching. Thus, there is provided an apparatus for registering parameters in the bore of a member which is, in use, connected to a pressurised housing, t... | 06/20/2006 |
| 6991039 | Well operations system A wellhead has, instead of a conventional Christmas tree, a spool tree in which a tubing hanger is landed at a predetermined angular orientation. As the tubing string can be pulled without disturbing the tree, many advantages follow, including access to the producti... | 01/31/2006 |
| 6978839 | Internal connection of tree to wellhead housing A subsea wellhead assembly has a tree that connects internally to the bore of wellhead housing. The tree has a lower end that has a lock member that is moved radially outward into engagement with a profile in the bore of the wellhead housing. The tree is a monobore,... | 12/27/2005 |
| 6966383 | Horizontal spool tree with improved porting The horizontal spool tree assembly 10 controls fluid flow through a production tubing string 18 within a well. The horizontal spool tree assembly is adapted for use with a workover string for fluid communication with the tree assembly. The spool body | 11/22/2005 |
| 6964304 | Technique for maintaining pressure integrity in a submersible system A technique for maintaining pressure integrity within a submersible system. The system utilizes a pressure housing with an internal component, such as a valve. The internal component is actuated by an external actuator via an actuator stem. A seal region is position... | 11/15/2005 |
| 6918446 | One-trip wellhead installation systems and methods Methods and devices are described for efficiently installing sea-borne wellhead components and tying back sub-sea wellhead components with them. In specific aspects, a single running and setting tool is used to land a tubing head housing upon the stem of a floating ... | 07/19/2005 |
| 6899172 | Abrasion resistant frac head A frac head comprising a main body with plural side entries oriented around the main body such that flow from each of the side entries meets flow from an opposing side entry in the internal bore. A replaceable abrasion resistant wear sleeve is secured in the interna... | 05/31/2005 |
| 6851478 | Y-body Christmas tree for use with coil tubing The invention provides a Y-body Christmas tree for use with coil tubing and other wellhead components which integrates components of a Christmas tree, while providing for coil tubing access without necessarily adding to the vertical height of the unit. The Y-body Ch... | 02/08/2005 |
| 6769490 | Downhole surge reduction method and apparatus A method and apparatus for use in the oil well industry for running in drilling/production liners and sub-sea casings down a borehole through drilling fluid on a drill pipe using a running tool with the benefits of surge pressure reduction are disclosed. In accordan... | 08/03/2004 |
| 6763891 | Production tree with multiple safety barriers The wellhead assembly has a production tree with multiple safety barriers. A tubing hanger lands and seals in the bore of the tree. The tubing hanger has a lateral production flow passage that registers with a lateral passage in the tree. A tubing annulus passage ex... | 07/20/2004 |
| 6742597 | Safety check valve for coiled tubing A spring-loaded check valve, mounted between a coiled tubing stripper and a BOP stack seals well bore pressure from the atmosphere when the coiled tubing is removed from the well bore. When no coiled tubing is in use, the check valve is shut against well bore pressu... | 06/01/2004 |
| 6729392 | Tubing hanger with ball valve in the annulus bore A tubing hanger is provided for suspending a tubing hanger from a wellhead housing. The tubing hanger body includes a production bore and an annulus bore, a valve opening inlet port, a valve closed inlet port, and a hydraulically operated ball valve to selectively o... | 05/04/2004 |
| 6715555 | Subsea well production system A tubing hanger positioned within the bore of a wellhead body has a vertical bore from which a tubing string may be suspended within a well bore. When the hanger is landed, a fluid passageway in the tubing hanger has one end in fluid communication with a passageway ... | 04/06/2004 |
| 6695064 | Slip spool and method of using same A slip spool for selectively supporting or snubbing a tubing string suspended in a wellbore can be mounted to a wellhead. The slip spool has an axial passage to be aligned with the wellbore and at least two radial passages extending through a side wall of... | 02/24/2004 |
| 6655455 | Flow completion system A flow completion system for controlling the flow of fluid from a well bore, the flow completion system comprising a tubing spool, a tubing hanger supporting a tubing string which extends into the well bore and defines a tubing annulus surrounding the tub... | 12/02/2003 |
| 6637514 | Recovery of production fluids from an oil or gas well A method and assembly for recovering production fluids from a well having a tree, using a conduit which is inserted into a production bore to divert the recovered fluids via chemical treatment, pumping or any other apparatus with minimal reduction in the ... | 10/28/2003 |
| 6626239 | Internal gate valve for flow completion systems A gate valve for a component which includes an elongated body and a flow passage extending generally longitudinally through the body, the flow passage including a generally lateral first branch connected to a generally longitudinal second branch. The gate... | 09/30/2003 |
| 6547008 | Well operations system A wellhead has, instead of a conventional Christmas tree, a spool tree (34) in which a tubing hanger (54) is landed at a predetermined angular orientation. As the tubing string can be pulled without disturbing the tree, many advantages follow, including a... | 04/15/2003 |
| 6497277 | Internal gate valve for flow completion systems A gate valve for a component which includes an elongated body and a flow passage extending generally longitudinally through the body, the flow passage including a generally lateral first branch connected to a generally longitudinal second branch. The gate... | 12/24/2002 |
| 6494257 | Flow completion system A flow completion system for controlling the flow of fluid from a well bore, the flow completion system comprising a tubing spool which includes a central bore that extends axially therethrough and a production outlet which communicates with the central b... | 12/17/2002 |
| 6488083 | Tubing hanger system A tubing hanger for a flow completion system which comprises a Christmas tree connected above a wellhead housing that includes a central bore in which the tubing hanger is supported, the tubing hanger comprising a generally annular body; a production bore... | 12/03/2002 |
| 6470971 | Tubing head control and pressure monitor device A tubing hanger and wellhead have features for controlling and monitoring fluid pressure to downhole equipment. The tubing hanger has an internal vertical passage. A hydraulic line connects to the lower end of the vertical passage and runs downhole. The v... | 10/29/2002 |
| 6453995 | Tubing hanger saddle valve A tubing hanger incorporates a flow control valve that is ordinarily found in a horizontal christmas tree. A branch passage forming a production fluid outlet has a mouth that intersects with a vertical production bore. A valve closure element in the form ... | 09/24/2002 |
| 6145594 | Gate valve for subsea completion system A caisson gate valve (10) fitting within an outer casing (12) extending downwardly from a subsea wellhead below the sea floor is disclosed. The gate valve (10) includes a valve body or block (14) having an axial bore or flow passage (16) therethrough and ... | 11/14/2000 |
| 6112810 | Remotely controlled assembly for wellbore flow diverter A wellbore flow diverter has been invented that, in certain aspects, has a housing with a main bore therethrough for fluid flow and a diverter bore therethrough for diverted fluid flow, the diverter bore in fluid communication with the main bore, internal... | 09/05/2000 |
| 6076605 | Horizontal tree block for subsea wellhead and completion method A subsea wellhead assembly has a tubular housing having a sidewall, an axial bore, and a housing lateral passage extending from the bore through the sidewall. A blocking sleeve fits around the housing to block the housing lateral passage while drilling th... | 06/20/2000 |
| 6050339 | Annulus porting of horizontal tree A horizontal tree has a vertical bore and a horizontal production passage and is landed in a wellhead housing. A tubing hanger lands in the bore and has a vertical passage and a horizontal passage that aligns with that of the tree. A retrievable first plu... | 04/18/2000 |
| 6044904 | Wellhead assembly A wellhead assembly provides a connection between a protruding wellhead pipe of a landfill and piping that leads to treatment, disposal, or recovery equipment, or the like. The wellhead assembly includes a first substantially hollow cylindrical member tha... | 04/04/2000 |
| 6039119 | Completion system A wellhead has, instead of a conventional Christmas tree, a spool tree (34) in which a tubing hanger (54) is landed at a predetermined angular orientation. As the tubing string can be pulled without disturbing the tree, many advantages follow, including a... | 03/21/2000 |
