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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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7472755 |
Method for inspection and repair of a flexible joint
A method for servicing a component of a riser system, such as a flexible joint is disclosed. The riser system may be supported in a support apparatus such that the flexible joint and an adjoining...
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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...
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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...
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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 )...
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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...
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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...
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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...
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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...
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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...
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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...
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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...
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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 )...
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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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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...
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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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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...
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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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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...
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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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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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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...
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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...
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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...
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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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6561735 |
Well riser lateral restraint and installation system for offshore platform
A floating platform system supports one or more decks ( 14 ) above the water surface for accommodating equipment to process oil, gas and water recovered from a subsea hydrocarbon formation. The...
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6551029 |
Active apparatus and method for reducing fluid induced stresses by introduction of energetic flow into boundary layer around an element
Discharge of fluid into or suction of fluid from the boundary region around such structures as offshore marine elements and moored marine vessels to reduce fluid current induced stress to marine...
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6540024 |
Small diameter external production riser tieback connector
A tieback connector includes a passive lower locking system and an active upper locking system to exert a positive locking force on the connection between a production riser and a high pressure...
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6520262 |
Riser connector for a wellhead assembly and method for conducting offshore well operations using the same
A riser connector is provided for connecting a riser to a wellhead assembly having a bore therethrough. The connector includes a housing having a first and a second end. The first end of the...
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6443240 |
Dual riser assembly, deep water drilling method and apparatus
A dual riser assembly for use with an offshore multi-activity drilling assembly to conduct drilling operations from a deck above the surface of a body of water into the bed of the body of water...
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6394195 |
Methods for the dynamic shut-in of a subsea mudlift drilling system
A method for a dynamic shut-in of a subsea mudlift drilling system. The method comprises detecting a kick, isolating a wellbore, and adjusting a subsea mudlift pump and a surface mud pump to...
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6386798 |
Universal catenary riser support
A universal catenary riser support that can be designed to accommodate all riser pipe diameters typically considered for production of offshore hydrocarbons and allows the catenary riser to exit...
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6382320 |
Method and system for offshore production of hydrocarbon fluids
This application discloses a method of extracting hydrocarbons from a submarine well, which is characterized in that a displacement fluid, e.g. water, is injected under pressure into the submarine...
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6367846 |
Connector for pipe sections having integral buoyancy cans
A coupling for two pipe sections having integral buoyancy cans, wherein the coupling includes two coupling flanges, each having an inner flange portion configured to couple the pipe stems of the...
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6352116 |
Riser moving and guiding using shuttle plates
A riser tube tower for stabilizing riser tubes extending from respective wellheads associated with a seabed frame on the seabed to a platform, preferably a tension leg platform, at the sea surface....
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6352114 |
Deep ocean riser positioning system and method of running casing
A deep ocean drilling system is disclosed for drilling offshore wells in extremely deep water using smaller and more economical drilling vessels. The system utilizes a reduced diameter drilling...
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6325159 |
Offshore drilling system
A system for drilling a subsea well from a rig through a subsea wellhead below the rig includes a wellhead stack which is mounted on the subsea wellhead. The wellhead stack includes at least a...
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6321844 |
Hybrid riser and method for sub-sea transportation of petroleum products with the device
A method for transporting petroleum products in deep water from the seabed up to a floating or semi-submersible surface structure wherein at least one rigid and straight hybrid riser extends...
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6309141 |
Gap spar with ducking risers
A spar platform is disclosed having a deck supported by a buoyant tank assembly having a first buoyant section connected to the deck and defining a central moonpool and a second buoyant section...
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6293343 |
External tieback connector and method for tying back riser to subsea wellhead
A connector for tying back a riser from a subsea wellhead to a platform, wherein the wellhead has an internal wellhead housing with external grooves thereon. The connector having a plurality of dog...
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6276456 |
Riser system for sub-sea wells and method of operation
A riser system connecting a oil or gas well head and a surface vessel comprises a first riser section maintained substantially vertically under tension, attached for example by a tension cable to a...
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6273193 |
Dynamically positioned, concentric riser, drilling method and apparatus
A dynamically positioned, concentric riser, drilling system comprising a dynamically positioned drilling unit operable to float at least partially above the surface of a body of water, a first,...
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6231265 |
Self-aligning subsea latch mechanism
A latching assembly includes a first mating portion and a second mating portion disposed adjacent and rotationally restrained relative to the first mating portion. A first cam member having a first...
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6230824 |
Rotating subsea diverter
A rotating diverter for isolating fluid in a well from other fluid above the well is provided. The rotating diverter includes a housing body which has a bore running through it. A retrievable...
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6220787 |
Ship type floating oil production system
A ship type floating oil production system for access to subsea wells through installation of surface wellheads on a ship type surface vessel on the sea comprises a cylindrical turret moored to a...
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6173781 |
Slip joint intervention riser with pressure seals and method of using the same
A pressurized slip joint for a marine intervention riser decouples the flowhead assembly in the moon pool of a vessel from the riser string, enabling safe changeover of equipment during workover...
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6170578 |
Monobore riser bore selector
A bore selection apparatus (38) is described for facilitating access from a single bore riser to a production bore (34,34a) or annulus bore (36, 36a) without using a wireline-run whipstock. The...
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6161620 |
Deepwater riser system
A deepwater riser assembly is disclosed for a riser connecting subsea equipment to a surface wellhead. A buoyancy can assembly provides an open ended buoyancy can tube which surrounds the upper end...
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6155748 |
Deep water riser flotation apparatus
A dual phase riser flotation system contains a number of passive phase buoyancy modules of syntactic foam contained within an outer skin, and a number of active phase buoyancy modules which are...
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