Abstract: An arctic jackup truss leg comprises a plurality of chords, an outer bracing network with a plurality of bracing elements connecting the plurality of chords, an internal bracing network with a plurality of bracing elements, and a bridge plate network with a plurality of bridge plates, wherein each bridge plate has two ends that are coupled with the bracing elements of the outer bracing network and the internal bracing network respectively.

Abstract: The present invention provides an the ice resistant Jackup leg that comprises a plurality of chords, a plurality of plate structures, wherein the chords and plate structures are alternatively positioned so that the plate structures connect the chords to form the peripheral structure of the ice resistant Jackup leg, a plurality of longitudinal stiffeners, wherein the longitudinal stiffeners are disposed onto the inner surface of the plate structures for stiffening the plate structures, and a plurality of traverse web frames or girders, wherein the traverse web frames or girders are disposed onto the inner surface of the plate structures for supporting the plurality of longitudinal stiffeners. The present invention also provides an ice resistant Jackup platform employing the ice resistant Jackup leg.

Abstract: The present invention provides an LNG production system and method with improved refrigeration. The refrigeration is achieved by a refrigeration device comprising a plurality of refrigerant compressors (11, 13, 15, 17) configured into a series arrangement to perform multi-stage compressions of a refrigerant, a plurality of aftercoolers (12, 14, 16, 18) each of which being coupled to each of the plurality of refrigerant compressors to cool the compressed refrigerant, a plurality of turboexpanders (19, 20) coupled to the last aftercooler (18) and configured into a series configuration to perform multi-stage expansions of the compressed refrigerant, and a plurality of refrigerant heat exchange means (33, 34) coupled to both the first (11) of the plurality of refrigerant compressors and the last (20) of the plurality of turboexpanders, so that all components form a close refrigeration cycle.

Abstract: A jackup deployed riser protection structure comprises a plurality of coupler receivers disposed onto a jackup hull, a tubular sleeve, wherein the tubular sleeve is a hollow structure that allows a riser to pass through, a support structure coupled with the tubular sleeve to provide support for the tubular sleeve, and a plurality of couplers coupled with the support structure, wherein each of the plurality of couplers is coupled with one of the plurality of coupler receivers, so that the jackup deployed riser protection structure is supported by the jackup hull in order to provide protection to the riser.

Abstract: Disclosed are various apparatus and method for transferring a hydrocarbon fluid between two bodies. To this purpose, a transfer skid and transfer hoses are moved from a first body to a second body to be installed thereupon to provide fluid communication between the two bodies. Offloading of hydrocarbon fluid may then take place between the two bodies. Emergency release operation may be triggered during the offloading, where the transfer hoses are disconnected from the transfer skid, and are returned to the first body. Various features of the transfer skid and associated apparatus allow the transfer skid to be installed on the second body with improved mating connections, transfer hoses to be returned to the first body after offloading operation without hydrocarbon fluid leakage, and transfer hoses to disconnect with speed and safety during emergency release operation.

Abstract: Disclosed are various apparatus and method for transferring a hydrocarbon fluid between two bodies. An offloading system for facilitating hydrocarbon fluid transfer between two bodies includes a transfer skid and a lifting system. The transfer skid is movable from a first body to a second body to be installed thereupon to facilitate hydrocarbon fluid transfer to and from the first and the second bodies. The lifting system may be provided on the first body, and includes an extendable lifting arm; a spreader frame attachment which includes at least a first and a second lifting device to support the transfer skid, wherein the spreader frame attachment is rotatably coupled to the extendable lifting arm to allow angular or rotatable adjustment of the transfer skid in a horizontal plane.

Abstract: The present invention provides a riser protection structure being suitable to be employed in a Jackup rig. The riser protection structure comprises a plurality of piles, an upper module, wherein the upper module comprises a main protection tubing for receiving a riser, a plurality of sleeves to be installed over the plurality of piles, and a connecting network; wherein the plurality of sleeves are disposed around the main protection tubing; and wherein the main protection tubing and the plurality of sleeves are connected together by the connecting network, and a lower module, wherein the lower module comprises a plurality of tubular guides for guiding and later fixing the piles and a connecting structure, wherein the plurality of piles are securely disposed into the seabed for providing the requisite support for the upper and lower modules when they are assembled.

Abstract: The invention relates to a jack-up rig. The inventive rig would work like a conventional jack-up rig while in open water with the hull jacked up out of the water. However, in the event of ice conditions, the hull is lowered into the water into an ice defensive configuration. The hull is specifically shaped with a lower portion that is an ice-bending surface to bend and break up ice that comes in contact with the hull while in the ice defensive configuration. Furthermore, the jack-up rig comprises at least two derricks.

Abstract: The present invention provides a structure-assisted Jackup system comprising a Jackup drilling unit with a main deck structure and a plurality of legs movably coupled with the main deck structure, one or more support base structures disposed on seabed, and a plurality of movable supports, wherein each of the plurality of movable supports is securely coupled with either the main deck structure or one or more support base structure. The present invention also provides a process for assembling the structure-assisted Jackup system.

Abstract: A structure-supported Jackup system comprising a Jackup drilling unit with a main deck structure and a plurality of legs movably coupled with the main deck structure, two or more support base structures disposed on seabed, and a plurality of movable supports, wherein each of the plurality of movable supports is securely coupled with either the main deck structure or one of the two or more support base structure.

Abstract: Disclosed are systems and methods for limiting structural damage to an affected offshore platform and preventing damage spread from the affected offshore platform to another platform during an accident or an emergency condition. An offshore platform arrangement includes a mobile offshore production unit (MOPU), a mobile storage platform and a mobile offloading platform which are disposed at a clearance distance from one another. The platforms are fluidly connected by pipes to allow hydrocarbon fluid transfer therebetween. The pipes are adapted to cease fluid communication of hydrocarbon fluid between platforms for preventing damage spread therebetween. Also disclosed is an offloading system for hydrocarbon fluid transfer which includes a lifting system having an extendable lifting arm and a spreader frame platform rotatably coupled to the lifting arm. The spreader frame platform is operable to support a transfer skid and allow angular adjustment of the transfer skid in a horizontal plane.

Abstract: Embodiments of the present invention provide a process for liquefaction of a natural gas. The process includes cooling the natural gas with a first refrigerant provided by a first cooling system and cooling the natural gas with a second refrigerant provided by a second cooling system. The second cooling system is a single phase cooling system. The first and second cooling systems operate independently from each other. The second refrigerant is cooled with the first refrigerant so that the cooling capacity of the second refrigerant and the second cooling system is increased.

Abstract: The present subject matter provides a three-rail multi-direction direct cantilever skidding system suitable for an offshore drilling system, where the three-rail multi-direction direct cantilever skidding system comprises movable guides accommodating the cantilever of a Jackup drilling unit and enabling transverse skidding rails to provide direct support for the cantilever so the cantilever may be moved in both longitudinal and transverse directions.

Abstract: During an offloading operation between a first and a second body, an operating envelope of an offloading system can be displaced to compensate for a drifting movement of one of the bodies. By appropriately displacing the operating envelope, offloading operation can continue under safe conditions even though the working limit of the original operating envelope is breached due to the drifting movement of one of the bodies.

Abstract: An installation vessel for installing an offshore structure, the installation vessel comprising a hull and a plurality of legs, each leg comprising vertical chords and cross braces, the hull having a plurality of leg openings each configured for passage of a leg therethrough, each leg opening having a number of jack-cases for supporting pinions thereon, each pinion being configured for rotatably engaging a rack disposed on a chord of the leg to move the leg relative to the hull, each jack-case comprising a number of guides for guiding passage of the leg through the leg opening, each guide comprising a plurality of angled surfaces configured for sliding engagement with a corresponding plurality of surfaces of a rack, each of the plurality of angled surfaces comprising a wear plate.

Abstract: The present invention provides a structure-supported. Jackup system comprising a Jackup drilling unit with a main deck structure and a plurality of legs movably coupled with the main deck structure, two or more support base structures disposed on seabed, and a plurality of movable supports, wherein each of the plurality of movable supports is securely coupled with either the main deck structure or one of the two or more support base structure. The present invention also provides a process for assembling the structure-supported Jackup system.

Abstract: The present invention provides a structure-assisted Jackup system comprising a Jackup drilling unit with a main deck structure and a plurality of legs movably coupled with the main deck structure, one or more support base structures disposed on seabed, and a plurality of movable supports, wherein each of the plurality of movable supports is securely coupled with either the main deck structure or one or more support base structure. The present invention also provides a process for assembling the structure-assisted Jackup system.

Abstract: The present invention provides an the ice resistant Jackup leg that comprises a plurality of chords, a plurality of plate structures, wherein the chords and plate structures are alternatively positioned so that the plate structures connect the chords to form the peripheral structure of the ice resistant Jackup leg, a plurality of longitudinal stiffeners, wherein the longitudinal stiffeners are disposed onto the inner surface of the plate structures for stiffening the plate structures, and a plurality of traverse web frames or girders, wherein the traverse web frames or girders are disposed onto the inner surface of the plate structures for supporting the plurality of longitudinal stiffeners. The present invention also provides an ice resistant Jackup platform employing the ice resistant Jackup leg.

Abstract: The present invention provides a skirted foundation that can be used in a jack-up rig for providing enhanced bearing capacity. The skirted foundation comprises a spudcan footing having an upper part and a base, wherein the upper part and the base are coupled at their peripherals to form an outer edge, wherein both the upper part and the base have a flat or conical configuration, and wherein the upper part supports one leg of a jack-up rig, and the base has a flat bottom or downward slope, and a skirt having an upper end being integrally coupled to the spudcan footing and downwardly projected to encircle the base and a lower end for penetrating seabed, wherein the skirt comprises a plurality of circumferential openings adjacent to the base of the spudcan footing and located within the top half of the skirt height.

Abstract: Embodiments of the present invention relate to a system and method for efficient removal of sulfur oxides (SOx), nitrogen oxides (NOx) and particulate matter (PM) contained in an exhaust gas generated from fuel combustion and efficient treatment of water containing microorganisms (e.g. ballast water).