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8453758 |
Dual density mud return system
Systems and methods for lifting drilling fluid from a well bore in a subsea formation are disclosed. Some system embodiments include a drill string suspended within a drilling riser to form the...
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8443898 |
Wellhead safety device
A wellhead safety device can include a tubular with outer surface portions having different diameters. A first seal groove can be disposed on a first outer diameter. A locking groove can be formed...
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8403059 |
External jet pump for dual gradient drilling
An apparatus comprises a jet pump assembly affixed to a riser string and to a blowout preventer. The jet pump assembly comprises a conduit and a sealing assembly configured to accelerate a drilling...
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8387704 |
System and method for simultaneous sea drilling operations
A system and method for carrying out simultaneous operations of assembling, dismantling, and maintaining equipment installed by an oil rig, using the tools, systems, and the areas available on the...
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8387705 |
Systems and methods for running casing into wells drilled with dual-gradient mud systems
Systems and methods for running and cementing casing into wells drilled with dual-gradient mud systems include running casing through a subsea wellhead connected to a marine riser, the casing...
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8365830 |
Multi-deployable subsea stack system
Methods for deploying a subsea blowout preventer stack system comprising a lower marine riser package, a blowout preventer stack with a first ram blowout preventer, and an additional blowout...
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8347982 |
System and method for managing heave pressure from a floating rig
A system compensates for heave induced pressure fluctuations on a floating rig when a drill string or tubular is lifted off bottom and suspended on the rig, such as when tubular connections are...
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8342249 |
Offshore drilling system
According to one or more aspects of the invention, a method for drilling an offshore wellbore into a seabed from a platform positioned proximate to the water surface comprises making-up a first...
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8322460 |
Dual density mud return system
Systems and methods for lifting drilling fluid from a well bore in a subsea formation are disclosed. Some system embodiments include a drill string suspended within a drilling riser to form the...
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8322439 |
Arrangement and method for regulating bottom hole pressures when drilling deepwater offshore wells
An arrangement and a method to control and regulate the bottom hole pressure in a well during subsea drilling at deep waters: The method involves adjustment of a liquid/gas interface level in a...
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8322432 |
Subsea internal riser rotating control device system and method
An RCD is used to provide a system and method for sealing a marine riser having a rotatable tubular. A bypass internal channel or external line may be used to allow fluid to bypass the RCD seal. An...
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8316963 |
Cuttings processing system
A method for using a vessel assembly including two or more vessels in multiple drilling unit operations, the method including using a vessel in the container assembly for cuttings storage, and...
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8316945 |
Downhole swivel apparatus and method
What is provided is a method and apparatus which can be detachably connected to an annular blowout preventer thereby separating the drilling fluid or mud into upper and lower sections and allowing...
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8176985 |
Well drilling and production using a surface blowout preventer
Production and drilling may be achieved by a system which uses a rotating head coupled to surface blowout preventer stack for fluid flow control. A casing connects these surface components to a...
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8162063 |
Dual gradient drilling ship
Dual gradient drilling may be performed by anchoring drilling tubulars from a drilling ship on the seabed. The drilling tubulars may include an inline pump for pumping mud through another set of...
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8157014 |
Subsea solids processing apparatuses and methods
In a dual-gradient drilling apparatus, a subsea solids processing unit includes a housing, a solids processing mechanism disposed in the housing between a drilling mud inlet and a drilling mud...
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8120508 |
Cable link for a wellbore telemetry system
A cable link may include a first link connector in signal communication with at least one sensor in a drill string and coupled to the drill string, a second link connector spaced apart from the...
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8118102 |
Downhole swivel apparatus and method
What is provided is a method and apparatus wherein a swivel can be detachably connected to an annular blowout preventer thereby separating the drilling fluid or mud into upper and lower sections...
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8087466 |
Centralization and running tool and method
The invention relates to a centralization and running tool (CTR) in a subsea installation in connection with offshore related oil and gas exploration, where the subsea installation (SCM) is...
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8079426 |
Integrated drilling deck and bop handling
A method for handling a blow-out-preventer on a drilling platform and a drilling platform having a lower pontoon structure; a plurality of columns extending upwards from the lower pontoon...
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8011435 |
Subsea lateral drilling
A method for drilling a borehole in a producing subsea wellbore wherein a flexible conduit is connected at one end to a surface vessel and at the other end via a pressurized subsea wellhead to the...
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7975770 |
Dual-BOP and common riser system
The disclosure is drawn to methods of drilling wells utilizing blow out prevention components of differing pressure ratings. In the initial drilling phase, a lower pressure rated blow out...
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7975771 |
Method for running casing while drilling system
At least a portion of a subsea well is drilled casing-while-drilling techniques. A landing shoulder is formed within an outer string of a casing. The outer string of casing is secured to an outer...
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7968184 |
Erosion resistant surface and method of making erosion resistant surfaces
An erosion resistant surface using a dense array of elastic whiskers to slow the velocity of erosive particles before impacting with the surface. A carbon nanotube forest is grown on the surface to...
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7958948 |
Method and system for return of drilling fluid
A system and method is described for use and return of drilling fluid/cuttings from a well, which is drilled on the ocean floor, in connection with offshore related oil production and gas...
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7950452 |
Anti-fouling system for offshore drilling structures
An anti-fouling system for offshore drilling structures which injects metallic ions into seawater pumping systems. An ion generator may be positioned at various positions including the strainer...
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7950463 |
Method and arrangement for removing soils, particles or fluids from the seabed or from great sea depths
A method for removing soils, particles or fluids from the seabed or from great sea depths, includes positioning a platform or a vessel above an offshore location, lowering a riser from the vessel...
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7938190 |
Anchored riserless mud return systems
A riserless mud recovery system including a mud return line secured by an anchor is disclosed. Some system embodiments for drilling a well bore in an offshore location having a water surface and a...
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7921917 |
Multi-deployable subsea stack system
Methods for deploying a subsea blowout preventer stack system comprising a lower marine riser package, a blowout preventer stack with a first ram blowout preventer, and an additional blowout...
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7913764 |
Return line mounted pump for riserless mud return system
Systems and methods for drilling a well bore in a subsea formation from an offshore structure positioned on a water surface with a drill string that is suspended from the structure and includes a...
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7828064 |
Downhole swivel apparatus and method
What is provided is a method and apparatus wherein a swivel can be detachably connected to an annular blowout preventer thereby separating the drilling fluid or mud into upper and lower sections...
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7819204 |
Subsea drilling
A method and apparatus for drilling subsea wells is provided. A subsea shut off device including ball gripping mechanisms is latched to a template at surface. Drilled in casing can be suspended...
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7814992 |
Device for storage of tubulars, apparatus for handling tubulars and a method for disassembling a pipe string
An apparatus for storing tubulars on a floating semi-submersible drilling or production vessel. The apparatus comprises a storage device for storing tubulars in a submerged position, essentially...
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7770655 |
Conductor casing installation by anchor handling/tug/supply vessel
An anchor handling/tug/supply (AHTS) vessel is employed to engage conductor casings with the seafloor. The conductor casings initially penetrate the seafloor to a first depth under their own...
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7730965 |
Retractable joint and cementing shoe for use in completing a wellbore
An improved method and/or apparatus for completing a wellbore is provided. In one embodiment, a method of lining a pre-drilled wellbore is provided. The method includes the act of providing a...
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7703534 |
Underwater seafloor drilling rig
A subsea drilling system comprises a pressurized drilling capsule that is sealed against the subsea environment and houses equipment for manipulating a drillstring that extends through an opening...
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7699109 |
Rotating control device apparatus and method
A riser assembly includes a rotating control housing connected between an upper portion and a lower portion of a riser assembly, and a packing element rotatable with respect to the rotating control...
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7677329 |
Method and device for controlling drilling fluid pressure
A method of reducing drilling fluid pressure during subsea drilling, where drilling fluid is pumped down into a borehole and then flows back to a drilling rig via the lined and/or unlined sections...
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7644768 |
Separation device for material from a drilling rig situated on the seabed
A drilling rig device (1) situated on the seabed (11), where the drilling rig (1) is sealingly enclosed against the surroundings, wherein the drilling rig (1) is liquid-filled and provided with a...
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7628224 |
Shallow/intermediate water multipurpose floating platform for arctic environments
A method and apparatus for conducting simultaneous drilling and production are provided. The apparatus can include a ship shape floating vessel, wherein the ship shape floating vessel includes at...
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7600570 |
Drilling rig placed on the sea bed and equipped for drilling of oil and gas wells
A drilling placed on the seabed and arranged for drilling of oil and gas wells is remote controlled from a light drilling vessel (2) through pipes and signal cables (3). The main structure of the...
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7546880 |
Extracting gas hydrates from marine sediments
A process for extracting hydrocarbon gases from marine sediment hydrates. In one embodiment, the process includes drilling from a sea floor into a hydrate rich subsea sediment to form at least one...
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7513310 |
Method and arrangement for performing drilling operations
An arrangement and a method to control and regulate the bottom hole pressure in a well during subsea drilling at deep waters: The method involves adjustment of a liquid/air interface level in a...
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7497266 |
Arrangement and method for controlling and regulating bottom hole pressure when drilling deepwater offshore wells
An arrangement and method for controlling and regulating bottom hole pressure in a well during subsea drilling in deep water involves adjustment of a liquid/gas interface level in a high pressure...
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7484575 |
Conductor pipe string deflector and method
An apparatus for deflecting a tubular string preferably comprising at least one side nozzle near the lower end of a first tubular string. The nozzle permits passage of a fluid therethrough from the...
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7451821 |
Blow out preventer transfer platform
An offshore well drilling assembly includes a drilling facility or support platform for location at sea. A drilling platform connects to the support platform so the drilling platform is...
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7367410 |
Method and device for liner system
Method for drilling and lining a well wherein at least one liner (1, 2, 32) with a larger external diameter than the substantial part of a drilling riser (10) is pre-installed at a point below the...
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7296628 |
Downhole swivel apparatus and method
What is provided is a method and apparatus which can be detachably connected to an annular blowout preventer thereby separating the drilling fluid or mud into upper and lower sections and allowing...
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7284615 |
Method and system for installing and maintaining a pipeline while minimizing associated ground disturbance
A pipeline installation and maintenance method and system is disclosed in which a number of interconnectible platform modules are assembled into drilling platforms from which a segmented pipeline...
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7270185 |
Drilling system and method for controlling equivalent circulating density during drilling of wellbores
A drilling system for drilling subsea wellbores includes a tubing-conveyed drill bit that passes through a subsea wellhead. Surface supplied drilling fluid flows through the tubing, discharges at...
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