Patents by Inventor Per Herbert Kristensen
Per Herbert Kristensen has filed for patents to protect the following inventions. This listing includes patent applications that are pending as well as patents that have already been granted by the United States Patent and Trademark Office (USPTO).
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Patent number: 9074446Abstract: A system (10) for managed pressure drilling, or for workover of a hydrocarbon well with a wellhead, the system comprising a floating structure that is located in a body of water (41). A method is also described for connecting up the system for managed pressure drilling or well workover. The floating structure comprises a drill floor (13) and a work deck (14) that is movably arranged in an essentially vertical direction in relation to the drill floor. The system further comprises a riser (28) and a slip joint (32) that is connected to the underside of the work floor and to the upper end of the riser such that the work deck can be moved relative to the riser. The riser extends from the slip joint down to a wellhead valve device (40) arranged on the wellhead of the hydrocarbon well. The floating arrangement also comprises heave-compensated riser tensioners (17) which are connected to the slip joint such that the riser is held under tension.Type: GrantFiled: March 23, 2012Date of Patent: July 7, 2015Assignee: MOSS MARITIME ASInventors: Per Herbert Kristensen, Lars Martin Sørhaug, Knut A. Sveen, Morten Bøhlerengen
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Patent number: 8813670Abstract: A floating structure 1, for instance a semi submersible platform, comprises a deck structure 2, vertical columns 3 and a pontoon structure 4. The floating structure 1 is moored to the seabed with anchor lines 7. The floating structure is moored with taut line anchoring system, and the vertical stiffness in the anchoring system is approximately 20% of the water plane stiffness for the floating structure. The pontoon structure 4 comprises at least two levels of pontoons and the columns 3 are formed to give variable water plane stiffness.Type: GrantFiled: January 26, 2004Date of Patent: August 26, 2014Assignee: Moss Maritime ASInventors: Per Herbert Kristensen, Erik Pettersen
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Publication number: 20140174753Abstract: A system (10) for managed pressure drilling, or for workover of a hydrocarbon well with a wellhead, the system comprising a floating structure that is located in a body of water (41). A method is also described for connecting up the system for managed pressure drilling or well workover. The floating structure comprises a drill floor (13) and a work deck (14) that is movably arranged in an essentially vertical direction in relation to the drill floor. The system further comprises a riser (28) and a slip joint (32) that is connected to the underside of the work floor and to the upper end of the riser such that the work deck can be moved relative to the riser. The riser extends from the slip joint down to a wellhead valve device (40) arranged on the wellhead of the hydrocarbon well. The floating arrangement also comprises heave-compensated riser tensioners (17) which are connected to the slip joint such that the riser is held under tension.Type: ApplicationFiled: March 23, 2012Publication date: June 26, 2014Applicant: Moss Maritime ASInventors: Per Herbert Kristensen, Lars Martin Sørhaug, Knut A. Sveen, Morten Bøhlerengen
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Publication number: 20110240305Abstract: A floating arrangement is provided for overhauling hydrocarbon wells at sea by means of coiled tubing, where the floating arrangement comprises a drill floor and a work deck which is arranged in an opening in the drill floor. The floating arrangement comprises a first set of heave-compensating devices which are arranged for connection to a slip joint connected to a riser in such a manner that an approximately constant tension in the riser can be maintained when the floating arrangement moves in the water. The floating arrangement further comprises a second set of heave-compensating devices which are arranged for connection to the work deck in such a manner that the work deck is at an approximately constant distance from the seabed when the work deck can move relative to the drill floor and the floating arrangement moves in the water. The invention also comprises a method for overhauling hydrocarbon wells at sea from a floating arrangement by means of a coiled tubing frame.Type: ApplicationFiled: December 11, 2009Publication date: October 6, 2011Inventors: Per Herbert Kristensen, Lars Martin Sørhaug, Leif Harald Pettersen, Knut A. Sveen
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Patent number: 7857001Abstract: The invention relates to a system to transfer fluid via at least one pipeline from one structure to another structure (such as a platform P and a vessel v respectively), in which one of the structures has an offloading arm 5 which is movable in to planes perpendicular to each other and in which a part of the offloading arm remote from the one structure is engagable with the other structure, so to allow linear and rotational movements between the structures. The pipeline along the offloading arm is configured to compensate for movements between the two structures in the longitudinal direction of the offloading arm.Type: GrantFiled: December 10, 2003Date of Patent: December 28, 2010Assignee: Moss Maratime ACInventors: Per Herbert Kristensen, Bjørn R. Lien, Per Erik Christiansen, Leif Harald Pettersen, Alexander Areshev
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Patent number: 7594836Abstract: The present invention relates to a floating loading buoy (1) comprising a surface element (2), columns (3) connecting the surface element (2) to a submerged pontoon element (4), mooring devices (5) for securing the loading buoy (1) to the seabed (6), at least one attachment point (7) for transfer pipelines (8) from a production/processing/storage unit (9) to the loading buoy (1), mooring and transfer devices (10) for transferring fluid from the loading buoy (1) to a loading/unloading vessel (11). The surface element (2) is arranged floating in the water plane surface (12) and has a substantially rounded cross section in a substantially horizontal plane and a draught in the body of water, the columns (3) extend from the surface element (2) down to the pontoon element (4), which in a substantially horizontal plane has a substantially rounded external perimeter and a draught in the body of water.Type: GrantFiled: March 2, 2005Date of Patent: September 29, 2009Assignee: Moss Maritime ASInventors: Per Herbert Kristensen, Ida Husem, Erik Pettersen, Tor Skogan
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Patent number: 7117810Abstract: The invention relates to a floating platform (1) for offshore drilling or production of hydrocarbons, comprising a topsides (2) and a substructure (3) having a lower pontoon (4) and columns (5) connecting the pontoon (4) to the topsides (2). Heave motion (s1, s2) of the platform (1) causes a change in the metacentric height (GM) of the platform. To counteract this change in metacentric height, the columns (5) are so adapted that the moment of area inertia of the waterline area of the columns (5) decreases on downward heave motion (s1) and increases on upward heave motion (s2).Type: GrantFiled: October 2, 2001Date of Patent: October 10, 2006Assignee: Moss Maritime ASInventors: Per Herbert Kristensen, Ida Husem, Erik Pettersen
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Publication number: 20040040487Abstract: The invention relates to a floating platform (1) for offshore drilling or production of hydrocarbons, comprising a topsides (2) and a structure (3) having a lower pontoon (4) and columns (5) connecting the pontoon (4) to the topsides (2). Heave motion (S1, S2) of the platform (1) causes a change in the metacentric height (GM) of the platform. To counteract this change in metacentric height, the columns (5) are so adapted that the moment of area inertia of the waterline area of the columns (5) decreases on downward heave motion (S1) and increases on upward heave motion (S2.Type: ApplicationFiled: May 7, 2003Publication date: March 4, 2004Inventors: Per Herbert Kristensen, Ida Husem, Erik Pettersen
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Publication number: 20030095839Abstract: A floating platform for offshore drilling or production of hydrocarbons comprises a topsides with drilling and/or production equipment (8), and a substructure comprising a lower pontoon (3) and columns (4) connecting the pontoon (3) to the topsides (1). During its operation the platform is exposed to wave forces (9) which cause heave motion (v) and roll and pitch motion (p) of the platform. The substructure has a draught (11) which is at least 40 metres, preferably at least 50 metres and most preferred at least 60 metres, and the ratio between the distance (16) between the columns' centre axes (25), measured along a side of the substructure, and the lower substructure's draught (11) is between 1.0 and 1.5, preferably between 1.2 and 1.4 and most preferred between 1.3 and 1.35.Type: ApplicationFiled: December 16, 2002Publication date: May 22, 2003Inventors: Per Herbert Kristensen, Ida Husem, Erik Pettersen
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Patent number: 6470969Abstract: An arrangement on a floating device for overhauling offshore hydrocarbon wells comprises a drill floor for conducting the overhaul, where the drill floor is provided with an opening. A vertically movable working deck can be inserted into the opening, and is provided with an attachment for a riser which extends from a well to the working deck. The working deck is suspended in the floating device by riser tensioners in order to maintain approximately constant tension in the riser during vertical movement of the floating device.Type: GrantFiled: September 8, 2000Date of Patent: October 29, 2002Assignee: Moss Maritime ASInventors: Lars Martin Sørhaug, Leif Harald Pettersen, Per Herbert Kristensen
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Patent number: 6390732Abstract: A jack-up, movable drilling platform comprises a telescopic outrigger structure which is movable between a retracted position where it is located above the drilling platform's deck and an extended position where it projects outwards and away from the deck, and a drilling rig which is securely attached to the outrigger structure.Type: GrantFiled: July 24, 2000Date of Patent: May 21, 2002Assignee: Moss Maritime ASInventors: Per Herbert Kristensen, Lars Martin Sørhaug, Leiken Dahl
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Patent number: 6024006Abstract: In a method for transferring a horizontally arranged rocket from a vessel to a floating structure, a ramp is provided in a position projecting out from the vessel, entirely or partially below a lifting device provided on a floating structure, and is connected to the floating structure. The rocket is moved completely or partially out on the ramp, and is lifted over to the floating structure by the floating structure's lifting device.Type: GrantFiled: August 18, 1998Date of Patent: February 15, 2000Assignee: Kvaerner Maritime ASInventors: Bj.o slashed.rn Kindem, Per Herbert Kristensen, Bj.o slashed.rn Reidar Lien
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Patent number: 5932830Abstract: A method of assembling, preparing, transporting to a launch site, and launching a rocket is disclosed. The rocket includes multiple stages and a payload to be carried into space. The rocket's longitudinal main axis extends horizontally during the assembling, preparing, and transporting of the rocket. The completed rocket may be transferred from a ship to a floatable structure with the rocket's main axis extending horizontally. The floatable structure can be movable and can raise the rocket prior to launching the rocket into space.Type: GrantFiled: January 2, 1998Date of Patent: August 3, 1999Assignee: Kvaerner Maritime ASInventors: Per Herbert Kristensen, Lars Martin S.o slashed.rhaug, Bj.o slashed.rn R. Lien, Einar Johannessen
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Patent number: 5918306Abstract: A device for assembling, transporting and launching rockets carrying a payload for transportation into space includes a ship and a floatable structure. The ship includes facilities on a covered deck to assemble multiple rockets in a horizontal orientation. The assembled rockets are hoisted from the ship to the floatable platform in a horizontal orientation. The floatable structure includes a hanger for the rockets, and facilities necessary for moving each horizontally oriented rocket to a launching pad, and for raising the rocket into a vertical position. A control room, onboard the ship, permits monitoring and control of the assembly of the rocket onboard the ship and of the launching of the rocket from the floatable platform.Type: GrantFiled: January 7, 1998Date of Patent: June 29, 1999Assignee: Kvaerner Maritime ASInventors: Per Herbert Kristensen, Lars Martin S.o slashed.rhaug, Bj.o slashed.rn R. Lien, Bj.o slashed.rn Kindem
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Patent number: 5908999Abstract: A device for transporting and launching rockets carrying a payload for transportation into space includes a floatable structure. The floatable structure includes a hoist for moving the rocket in a horizontal orientation from a ship to a deck of the floatable structure. The floatable structure also includes a hanger for the rocket, and facilities necessary for moving the horizontally oriented rocket to a launching pad, and for raising the rocket into a vertical position.Type: GrantFiled: January 13, 1998Date of Patent: June 1, 1999Assignee: Kvaerner Maritime ASInventors: Per Herbert Kristensen, Lars Martin S.o slashed.rhaug, Bj.o slashed.rn R. Lien, Egil Th.o slashed.mt
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Patent number: 5906171Abstract: A floating runway is provided for use at sea having a horizontal, top surface whereupon aircraft may operate during landing and take-off. A number of floating, releasably interconnected supporting section are connected to a number of bridge sections mounted alternately and consecutively in a longitudinal direction of the runway. The number of supporting sections and the number of bridge sections include ends, as viewed in the logitudinal direction of the runway having respective abutment portions adapted for mutual abutment for interconnection of the section. The abutment portions including cantilevered beam portions projecting away from mid portions of the respective sections as reviewed in the longitudinal direction thereof. The beam portions of the bridge sections include a lower surface and an upper surface of the beam portions of the supporting sections arranged the same distance from the top surface.Type: GrantFiled: September 24, 1997Date of Patent: May 25, 1999Assignee: Kvaerner Maritime asInventors: Per Herbert Kristensen, Lars Martin S.o slashed.rhaug