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| Number | Title | Issue Date |
| 8011436 | Through riser installation of tree block A subsea well assembly has a tubing hanger that lands and seals in a wellhead housing. A tree block is lowered through the drilling riser into engagement with the tubing hanger. The tree block has a lower portion that inserts and latches into the bore of the wellhea... | 09/06/2011 |
| 7451822 | Method for retrieving riser for storm evacuation A method for preparing to move a floating structure away from a wellbore drilled below the bottom of a body of water includes filling a riser extending from the bottom of the body of water to the floating structure with water. The water in the riser is displaced to ... | 11/18/2008 |
| 7438505 | Heave compensated snubbing system and method A heave compensation system to enable the transfer of tubulars between a floating platform and a snubbing jack. The heave compensation system includes a first end connected to the floating platform and a second end in connection with a traveling slip assembly of the... | 10/21/2008 |
| 7389818 | Method and device by a displacement tool A method and device for use in the replacing of liquid in a riser (12) of the kind used in the recovery of petroleum offshore, wherein the riser (12) forms a connection between a wellhead (4) on or above the sea floor (6) and a drilling v... | 06/24/2008 |
| 7373986 | Riser connector A riser connector connects the upper portion of a riser (12) having a latching enlargement (32) to a receptacle (14) on a vessel (16), so the riser upper end (22) can connect to a fluid coupling (42) leading to a conduit ( | 05/20/2008 |
| 7337848 | Preloaded riser coupling system An offshore riser system has riser joints, each having a pin and a box. The pin has an external grooved profile that is engaged by a locking element carried by the box of another riser joint. An actuating ring engages with the locking element to move it into the loc... | 03/04/2008 |
| 7337849 | Co-linear tensioner and methods of installing and removing same The invention is directed to a tensioner for providing linear and angular movement of a drilling or production facility relative to a conduit or riser secured to the tensioner and to the wellhead in offshore operations. The tensioner compensates for vessel motion in... | 03/04/2008 |
| 7331395 | Riser make-up tool An offshore riser system has riser joints, each having a pin and a box. The pin has an external grooved profile that is engaged by a locking element carried by the box of another riser joint. An actuating ring engages with the locking element to move it into the loc... | 02/19/2008 |
| 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 |
| 7324929 | Method and system for simulating a hydrocarbon-bearing formation The invention is a method for simulating one or more characteristics of a multi-component, hydrocarbon-bearing formation into which a displacement fluid having at least one component is injected to displace formation hydrocarbons. The first step of the method is to ... | 01/29/2008 |
| 7314088 | System for retrieving a tubular element from a well A system is disclosed for retrieving a tubular element extending into a subsea well provided with a wellhead, the tubular element being provided with a hanger suspending the tubular element at the wellhead, the hanger having a larger outer diameter than the tubular ... | 01/01/2008 |
| 7278477 | Cup tool, cup tool cup and method of using the cup tool A cup tool includes a cup tool tube having a threaded upper end for connection to a high-pressure mandrel, an outer surface over which an elastomeric cup is slidably mounted for reciprocal movement from an unset position for entry into a wellbore to a set position i... | 10/09/2007 |
| 7261164 | Floatable drill cuttings bag and method and system for use in cuttings disposal In aspects, embodiments of the present invention provide devices, systems and methods for managing cuttings formed during drilling of a subsea wellbore. By managing, it is meant the processing, storage, transportation and disposal of the cuttings. In an exemplary ap... | 08/28/2007 |
| 7240736 | Drilling and producing deep water subsea wells Subsea wells are drilled and completed with an offshore floating platform in a manner that allows simultaneous work on more than one well. A first well is drilled and casing. Then a tubing hanger is run through a drilling riser and landed in the wellhead housing. Th... | 07/10/2007 |
| 7237613 | Underbalanced marine drilling riser A riser assembly for offshore drilling has an inner conduit suspended within an outer riser. A seal assembly seals an annular space between the inner conduit and the riser at the lower end of the inner conduit. The seal assembly has a pressure area that is independe... | 07/03/2007 |
| 7225877 | Subsea intervention fluid transfer system A system for subsea transfer of intervention fluids to a subsea intervention apparatus, the system, in certain aspects, including a structure and a frame pivotably mounted thereto, a plurality of frame fluid conduits on the frame for conducting fluid from a connecto... | 06/05/2007 |
| 7210531 | Protective element for a riser segment A protective element for a riser segment, including an elongated buffer body, at least one foot connected with the buffer body, the at least one foot being provided with an engagement part arranged to engage on a main pipe of a riser segment, the distance between th... | 05/01/2007 |
| 7194913 | Apparatuses and methods for monitoring stress in steel catenary risers The invention describes apparatuses and methods of monitoring fatigue, structural response, and operational limits in structural components. More particularly, the present invention relates to fatigue, response, and operational monitoring systems on steel catenary r... | 03/27/2007 |
| 7191836 | Dry tree subsea well communications apparatus and method using variable tension large offset risers Disclosed are compliant variable tension risers (106) to connect deep-water subsea wellheads (102) to a single floating platform (104). The variable tension risers (106) allow several subsea well-heads (102), in water depths from 4... | 03/20/2007 |
| 7185705 | System and method for recovering return fluid from subsea wellbores A subsea return fluid recovery system for recovering drilling fluid and cuttings (“return fluid”) from a subsea wellbore in one embodiment includes a hub at the opening of the subsea wellbore that directs fluid into a transport device. In one embodiment, the hub... | 03/06/2007 |
| 7163062 | Riser A riser for conveying fluids from a subsea location to a surface vessel comprises an upper section which is located in a confining conduit, said upper section being allowed to deform elastically into a helical configuration against the inside of the confining condui... | 01/16/2007 |
| 7150324 | Method and apparatus for riserless drilling An offshore riserless drilling system drills a subsea borehole from a platform and through a cased borehole. The system comprises a lightweight drill string suspending a bottomhole assembly and extending from the platform downwardly through a depth of water into the... | 12/19/2006 |
| 7114885 | Protection means for a flexible riser The invention relates to flexible risers for transfer of hydrocarbons between a sea bed installation and a vessel (10) floating at the sea surface. The riser (18) is provided with means (20) for protecting the riser (18) from impacts. The... | 10/03/2006 |
| 7104329 | Marine bottomed tensioned riser and method A new marine oil production riser system for use in deepwater applications is disclosed. An efficient means for accommodating movements of the host facility, while maintaining riser top tension within the limits for long-term riser performance. Long riser stroke len... | 09/12/2006 |
| 7096958 | Compliant buoyancy can guide A floating offshore platform, of the type having a buoyancy can disposed within a support structure, includes a can guide assembly that has at least two compliant compression pads that are configured and arranged to provide a non-linear load-versus-deflection charac... | 08/29/2006 |
| 7073593 | Method of drilling and operating a subsea well A method of preparing and operating a subsea well (23), comprising the steps of: locating a drill-through subsea tree (24) on a subsea wellhead; sealingly connecting a high pressure drilling riser (22) between the tree and a drilling platform at... | 07/11/2006 |
| 7066686 | Automatic control methods for positioning the lower end of a filiform structure, notably an oil pipe, at sea Method intended for automatic control of an underwater pipe for connecting the lower end of the pipe to a wellhead, wherein the following stages are carried out: Stage 1: determining a mathematical model expressing the position of ... | 06/27/2006 |
| 7059416 | Buoyancy can for offshore oil and gas riser A buoyancy can for supporting an offshore oil and gas riser includes an axial bore through which the riser extends coaxially, and a radio-axial slot extending through a side of the can and into the axial bore. A pair of spaced-apart support features are disposed coa... | 06/13/2006 |
| 7040406 | Subsea riser disconnect and method A subsea riser disconnect assembly 10 may be actuated from a drilling rig DR by axial movement of an upper riser 35 relative to a lower riser 28, for disconnecting the upper riser 35 from the lower riser 28. A subsea riser valve as... | 05/09/2006 |
| 7030616 | Underwater cable locating device An apparatus for locating a buried utility conveyance, such as an undersea cable, beneath a body of water. The apparatus generally comprises a submersible housing that contains a variable ballast system for selectively controlling the buoyancy of the apparatus, oper... | 04/18/2006 |
| 7025535 | Seafloor/surface connecting installation for a submarine pipeline which is connected to a riser by means of at least one elbow pipe element that is supported by a base A bottom-to-surface connection installation for an undersea pipe. The installation comprises a vertical riser having its bottom end connected to an undersea pipe on the sea bed, and having a float at its top end, and a pipe connecting a floating support at the top e... | 04/11/2006 |
| 7021402 | Method for using a multipurpose unit with multipurpose tower and a surface blow out preventer A method of drilling and completing an underwater well entails installing conductor casing from a floating vessel into a seabed; drilling a bore through the conductor casing to a defined depth in the seabed; and installing surface casing through the conductor casing... | 04/04/2006 |
| 7006959 | Method and system for simulating a hydrocarbon-bearing formation The invention is a method for simulating one or more characteristics of a multi-component, hydrocarbon-bearing formation into which a displacement fluid having at least one component is injected to displace formation hydrocarbons. The first step of the method is to ... | 02/28/2006 |
| 6968902 | Drilling and producing deep water subsea wells Subsea wells are drilled and completed with an offshore floating platform in a manner that allows simultaneous work on more than one well. A first well is drilled and cased. Then a tubing hanger is run through a drilling riser and landed in the wellhead housing. The... | 11/29/2005 |
| 6886637 | Cylinder-stem assembly to floating platform, gap controlling interface guide A cylinder-stem assembly to floating platform, gap controlling interface guide. A longitudinal wear strip and mating guide are positioned at an angle relative to a tangent to the nominally round exterior cylinder of the cylinder. Cylinder guides may be provided at m... | 05/03/2005 |
| 6708765 | Method and device for riser tensioning To maintain a riser under tension, the riser can be connected to a gripper (5, 12) which is connected to vertical toothed racks (4) that are in constant engagement with gear wheels (22) which are driven with constant torque, preferably by hydrau... | 03/23/2004 |
| 6679331 | Compliant buoyancy can guide A guide for a buoyancy can on a floating offshore platform. The platform includes at least one support structure adjacent the buoyancy can. The guide comprises at least one compression pad supported by the support structure and adjacent the exterior surfa... | 01/20/2004 |
| 6644894 | Passive apparatus and method for reducing fluid induced stresses by introduction of energetic flow into boundary layer around structures The use of fluid passages for structures in fluid environments such as offshore platform risers or spars to reduce and/or control vortex-induced vibrations and drag is disclosed. The use of fluid passages to protect a moored marine vessel by reducing and/... | 11/11/2003 |
| 6615915 | High pressure side-by-side wellhead system The present invention is a wellhead system for use in completing at least two well bores from within a single conductor housing. The wellhead system comprises at least one wellhead housing which is supported on the conductor housing and which comprises a ... | 09/09/2003 |
| 6601656 | Method and apparatus for drilling an offshore underwater well A method of drilling an offshore underwater well comprising the steps of installing a riser conduit so that it is substantially vertically supported at a production deck. The riser conduit deviates progressively further from the vertical with increasing s... | 08/05/2003 |
