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7591316 |
Production system
A known deepwater solution for production risers for extracting oil and gas is the SLOR™ riser. The design of the SLOR™ riser is not compatible with large numbers of risers and thus there is a...
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7591315 |
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...
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7559723 |
Hull-to-caisson interface connection assembly for spar platform
A hull-to-caisson interface connection assembly accommodates high tension loads between the hull and a caisson of a Spar-type platform, while facilitating angular flexing motion and constraining...
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7537416 |
Riser support system for use with an offshore platform
A riser support system for use in a body of water comprises a buoyant and ballastable support structure and a plurality of substantially vertical and rigid risers each of which is attached to the...
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7520330 |
System and method for limiting vortex-induced vibrations on an offshore production riser
The present invention relates to a method and to a system for limiting vortex-induced vibrations on a riser suspended at one end from a support and subjected to substantially transverse fluid...
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7503391 |
Tieback connector
A tieback connector for attaching a riser to a subsea production assembly is provided. The tieback connector includes a main body adapted to be coupled to the subsea production assembly having a...
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7458425 |
System and method of installing and maintaining an offshore exploration and production system having an adjustable buoyancy chamber
A system and method of establishing an offshore exploration and production system is disclosed, in which a well casing is disposed in communication with an adjustable buoyancy chamber and a well...
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7416025 |
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 ) in wet tree or dry try systems. The variable tension...
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7328747 |
Integrated buoyancy joint
A buoyancy system includes a plurality of buoyancy joints distributed along a riser system. Each joint can include a riser pipe, an external frame disposed around a riser and a vessel, and a...
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7328741 |
System for sensing riser motion
A riser monitoring assembly is provided to monitor and manage a riser extending between subsea well equipment and a floating vessel. A riser measurement instrument module is connected adjacent a...
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7287936 |
Shallow water riser configuration
A shallow water riser extending between a seabed connection and a floating support connection and of a length through the shallow water to be in wave form with at least one and, as illustrated, two...
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7216699 |
Sub mudline abandonment connector
An inner tubular member of a subsea wellhead assembly carries a locking member that moves between a locked and unlocked positions lands within an outer tubular member having a grooved profile in...
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7200540 |
System and method for automated platform generation
Systems for implementing methods for generating platform location sets comprising selecting a set of platform locations; determining additional platform locations to add to the set of platform...
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7191837 |
Motion compensator
A motion compensator is used on a floating vessel servicing a subsea well. The motion compensator includes a first frame assembly adapted to be connected to a cable extending from a lifting...
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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...
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7156039 |
Keel guide system
A technique for guiding a riser in an offshore environment. The technique utilizes a keel guide that permits the passage of connectors or other components therethrough. A bushing is mounted within...
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7121767 |
Rugged foam buoyancy modules and method of manufacture
A buoyancy module comprises a multi-layer outer protective shell that has an exterior surface and an interior surface. A first layer of foam buoyancy material is located adjacent to the interior...
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7100694 |
Marine riser tower
The invention relates to a marine riser tower having a plurality of rigid metallic conduits bundled together with a metallic tubular core. The conduits may include production lines for...
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7097387 |
Engineered material buoyancy system and device
There is provided a buoyancy system for a structure having at least one component being substantially stationary with respect to the bottom of a water covered area. The system comprises a set of...
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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...
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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...
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7044228 |
Flowline jumper for subsea well
A subsea well system has a flowline jumper that extends between components on the sea floor. The jumper has connectors on each end for connecting to the two components and has a curved portion. At...
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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...
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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...
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7017666 |
Smooth sleeves for drag and VIV reduction of cylindrical structures
A method for controlling drag and vortex induced vibration in a substantially cylindrical element by providing an ultra-smooth surface about the cylindrical element. The system for controlling drag...
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7008141 |
Collapsible buoyancy device for risers on offshore structures
Expandable and contractible buoyancy modules are assembled to the risers of a deepwater exploration spar or other offshore structure to provide an upwardly directed buoyancy force to offset at...
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6896062 |
Riser buoyancy system
A frame and system for adding buoyancy to a riser used in connection with floating platforms is provided which, in some example embodiments, includes a stem attached to multiple supports which...
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6854516 |
Riser buoyancy system
A frame and system for adding buoyancy to a riser used in connection with floating platforms is provided which, in some example embodiments, includes a stem attached to multiple supports which...
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6848863 |
Engineered material buoyancy system and device
There is provided a buoyancy system for a structure having at least one component being substantially stationary with respect to the bottom of a water covered area. The system comprises a set of...
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6837311 |
Hybrid riser configuration
Hybrid riser configuration comprising a plurality of steel riser pipes substantially inserted in aluminium guide conduits, with buoyancy means and tethering tension means, the guide conduits and...
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6821055 |
Marine buoyancy modules and units
A cylindrical buoyancy unit is composed of separate sections which are held together to surround a marine object such as a riser or pipe with additional conduits. The sections combine to define an...
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6817809 |
Seabed oil storage and tanker offtake system
An offshore oil storage and offtake system is disclosed. The system includes a storage tank attachable to the seabed and adapted to store hydrocarbons. At least one fluid channel is included which...
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6811355 |
Loading arrangement for floating production storage and offloading vessel
A loading arrangement includes a riser that extends from a subsea structure to a coupling element for coupling the riser to a vessel. The coupling element includes a buoy body which is connected to...
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6805201 |
Internal beam buoyancy system for offshore platforms
A buoyancy system to buoy a riser of an offshore oil platform includes buoyancy compartments coupled around an elongated internal beam. The internal beam can withstand loads between the oil...
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6746761 |
High temperature silicone based subsea insulation
The invention is an insulation material which comprises a silicon based matrix and a plurality of non-metallic beads supported in the matrix. In one embodiment of the invention, the matrix...
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6746182 |
Keel joint arrangements for floating platforms
Keel joint assemblies are described that permit a degree of rotational movement of a riser within the keel of a floating vessel and greatly reduce the amount of stress and strain that is placed...
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6712560 |
Riser support for floating offshore structure
A floating offshore platform configuration is provided, which decouples pitch, roll, and heave motions from acting on tensioned risers and accommodates the angular displacement induced by floating...
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6712559 |
Seafloor-surface linking device comprising a stabilizing element
A bottom-to-surface link with at least one underwater pipe having a portion with a substantially constant diameter and one or more floats in a string, the floats constituting cans surrounding the...
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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...
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6691784 |
Riser tensioning system
In a substructure ( 10 ) for a floating oil or gas production platform, an arrangement to tension a plurality of risers ( 16 ) extending from the sea bed up to the substructure, the arrangement...
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6682266 |
Tension leg and method for transport, installation and removal of tension legs pipelines and slender bodies
A tendon which is divided into compartments enclosing therein pressurized gas. A method for transporting a fluid containing tubular body or assembly of bodies above a sea/river bed floor and within...
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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...
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6659690 |
Tapered stress joint configuration
A stress joint for a subsea riser has a reduced diameter intermediate section to reduce bending stresses on the connection between the stress joint and the riser as well as the subsea equipment....
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6648074 |
Gimbaled table riser support system
For a spar type floating platform having risers passing vertically through the center well of a spar hull, there is provided apparatus for supporting the risers from a gimbaled table supported...
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6637513 |
Riser pipe construction and module therefor
A riser pipe construction for a drilling connection from a drilling vessel to a valve previously provided on a sea floor comprises a riser pipe through which drilling means can be passed by means...
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6609572 |
Riser connector
A system for connecting and disconnecting a lower end of a marine riser ( 25 ) to and from a blow out preventer stack on a subsea Wellhead comprises gripping members ( 26 ) for the marine riser and...
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6595293 |
Apparatus and method for connecting riser between a floating vessel and a subsea structure
A method and apparatus for connecting riser between a floating vessel and a subsea structure that reduces the size of the air tanks used and thereby allow closer positioning of the well slots and...
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6579040 |
Method and apparatus for air can vent systems
An air-can riser tensioning device for use in the production of oil and gas at offshore locations includes at least one air-can used to place a vertical force on the riser. The air-can includes an...
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6578637 |
Method and system for storing gas for use in offshore drilling and production operations
Gas storage is provided for a subsea gas-lifted riser during offshore drilling and/or production operations. One or more gas storage chambers positioned along and about the subsea riser are...
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6571878 |
Smooth buoyancy system for reducing vortex induced vibration in subsea systems
Smooth buoyancy cylindrical elements having a surface roughness coefficient of K/D less than or equal to 1×10 −4 , where K is the average peak-to-trough roughness and D is the effective outside...
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