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| Number | Title | Issue Date |
| 7377311 | Wellhead valves A safety valve system for removing down-hole tools from a coal-bed methane well. The system includes first and second horizontally opposed stuffer-blocks, a stuffer-box housing for housing the stuffer-blocks, a means for attaching said stuffer-box housing to a coal-... | 05/27/2008 |
| 7331393 | Subsea lubricator device and methods of circulating fluids in a subsea lubricator Subsea lubricator device, comprising a blowout preventer assembly, a tool housing assembly and a stuffing box, intended to be located at a subsea Christmas tree, and methods of circulating fluids in a subsea lubricator. The device comprises a blowout preventer (4... | 02/19/2008 |
| 7231970 | Non-rotational casing hanger and seal assembly running tool A non-rotational casing hanger and seal assembly running tool for use in oil and gas drilling operations has a mandrel and a tool body that is carried by the mandrel. The tool body supports a plurality of latching segments for releasably connecting the tool body to ... | 06/19/2007 |
| 7219741 | Tubing annulus valve A subsea wellhead assembly has a tubing hanger with a tubing annulus passage and a production passage. A metal-sealing shuttle valve is mounted in the tubing hanger for blocking upward flow through the tubing annulus passage. The shuttle valve has a retention mechan... | 05/22/2007 |
| 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 |
| 7073591 | Casing hanger annulus monitoring system A subsea wellhead assembly has the capabilities of communicating from a tree assembly mounted on an inner wellhead housing to a casing annulus. A passage in the wellhead assembly extends within the bore of the wellhead housing from the casing annulus to the tree ass... | 07/11/2006 |
| 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 |
| 7051804 | Subsea protective cap A cap for covering an open upper end of a subsea structure includes a base and a body. The base has a size, after shrinkage, at least slightly larger than the exterior of the open upper end of the subsea structure. The body is connected to the base and projects down... | 05/30/2006 |
| 6969070 | Split carrier annulus seal assembly for wellhead systems The seal assembly 10 seal between a subsea wellhead housing 12 and a casing hanger 16. A metal seal body 20 includes fingers 32 and 34 and one or more elastomeric seals 38. An upper seal body 64 may include thr... | 11/29/2005 |
| 6823941 | Recovery of production fluids from an oil or gas well A flow diverter assembly for a tree, the flow diverter assembly having a flow diverter to divert fluids flowing through the production bore of the tree from a first portion of the production bore to the cap, and to divert the fluids back from the cap to a second por... | 11/30/2004 |
| 6702013 | Multiport gate valve assembly for flow completion system A flow completion system comprises a tubing spool which is connected above a wellhead housing, a tubing hanger which is supported in the tubing spool and which includes an axial production bore and at least two conduits that each extend from the bottom of... | 03/09/2004 |
| 6681850 | Flow completion system A flow completion system for controlling the flow of fluid from a well bore, the flow completion system includes a tubing spool which includes a central bore that extends axially therethrough and a production outlet which communicates with the central bor... | 01/27/2004 |
| 6675900 | Crossover tree system A subterranean oil or gas well apparatus is provided. The apparatus includes a single-bore production tubing hanger arranged concentric with a wellhead. The tubing hanger includes a plurality of ports and channels arranged about the tubing hanger to give ... | 01/13/2004 |
| 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 |
| 6571868 | Well head lubricator assembly with polyurethane impact-absorbing spring A lubricator assembly for a well head of a gas-producing well includes an elongated rigid tubular body having upper and lower ends and a cylindrical interior chamber open at the lower end for receiving a leading end of a gas lift plunger at the well head,... | 06/03/2003 |
| 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 |
| 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 |
| 6244359 | Subsea diverter and rotating drilling head A drilling head used to seal around a drill pipe while drilling is employed in a subsea location. The drilling head has an inner body located within an outer body. At least one bearing is located between the outer body and the inner body for facilitating ... | 06/12/2001 |
| 6024172 | Blow-out preventer The invention provides a versatile blow-out preventer having a hydraulically activated bladder and a mechanically operated set of rams mounted in a single body, occupying a minimum of vertical space, and being adapted to operate whether or not there is eq... | 02/15/2000 |
| 5971079 | Casing filling and circulating apparatus A casing fill and circulator assembly is disclosed. The fill valve is constructed so that the valve member moves out of the main flowpath when the valve is in the open position. The valve is constructed so that flow opens it and the majority of the pressu... | 10/26/1999 |
| 5865245 | Stuffing box gland A stuffing box gland 20 that cooperates with packing 38 positioned within a stuffing box 18 to seal between a stuffing box housing 42 and a moveable polished rod 27 of an oilfield pump assembly 10. A lower end of a gland housing 46 forms a flange 50 exten... | 02/02/1999 |
| 5615737 | Apparatus for insertion of full bore tools into an earth borehole Apparatus for inserting full bore tools into an earth borehole, such as oil and gas wells, includes: a blowout preventer assembly superimposed on the wellhead of the borehole; a seal body having an internal concentric seal diameter, superimposed on the bl... | 04/01/1997 |
| 5535827 | Hydraulic connector A hydraulic connector having a first assembly releasably connected to a second assembly. The first assembly includes a substantially cylindrical body having a longitudinal bore therethrough and a receptacle portion surrounding the longitudinal bore. The f... | 07/16/1996 |
| 5246067 | Well leak catcher A leak catcher for use on a pumping well around a polished rod operating a downhole pump in the well including an annular drip bowl connected with a base securable to the upper end of a well casing around a polished rod, a drain line fitting opening into ... | 09/21/1993 |
| 4690221 | Well tubing hanger method and apparatus for use in well control A well tubing hanger designed for severe service applications includes an annular seal formed about the tubing hanger exterior that is not energized during normal well operations. The annular seal is energized by lowering the tubing hanger downward within... | 09/01/1987 |
| 4553591 | Oil well drilling apparatus An apparatus for use with an oil well drilling apparatus, including an annular spool interposed permanently between the well blowout preventer stack and the upper bell nipple. The spool receives a plurality of different mandrels, including a test mandrel ... | 11/19/1985 |
