Abstract: An offshore well system for a subsea well, including a floating platform, a drilling riser system connected with the well for drilling operations, and a production riser system connected with the well for production operations. The drilling system also includes a riser tension system. The riser tension system is capable of compensating for movement of the platform while adequately tensioning both drilling riser system and the production riser system when each are connected to the well.

Abstract: An offshore well system for a subsea well. The system includes a floating platform, an external riser and an internal riser nested within the external riser. A external riser tension device tensions the external riser. The drilling system also includes a surface wellhead system that includes a wellhead, a collet, and a flange assembly. The wellhead, collet, and flange assembly are assembled to establish a common bore for receiving the top of the internal riser. A gasket located between the top of the internal riser and an inner shoulder of the flange assembly seals between the wellhead system and the top of the internal riser. The surface wellhead system also retains the internal riser in tension with the wellhead, the internal riser extending above the wellhead into the collet.

Abstract: A novel valve assembly is provided. In one embodiment, the valve assembly includes a seat plate having a plurality of fluid conduits. The valve assembly may also include a plurality of poppet assemblies. In some embodiments, a poppet assembly of such a plurality includes at least one fluid port and a housing configured to be coupled to the seat plate to facilitate flow of a fluid through a respective fluid conduit via the at least one fluid port of the respective poppet assembly. Other devices, systems, and methods related to poppet assemblies are also disclosed.

Abstract: The volute is cast integrally with the gearbox base to allow closer radial tolerances to be used to improve efficiency. In the preferred embodiment, compressors for multi-stage compression are assembled with intercoolers and the integral volute is cast together with the impeller housing and the lower gearbox housing and the associated intercooler. Efficiency increases of 2% or more are achievable. In multistage applications, efficiency gains in the early stages are compounded in each subsequent stage. Speed changes that change center distance between bull gear and pinion are accommodated by an offset opening in the inlet and diffuser that can line up with the impeller shaft as well as an offset opening in the fluid seal despite a pinion gear change, by reorientation and remounting of those parts.

Abstract: Systems and methods are provided that may include employing a lockscrew to provide radial and axial force in connecting tubular members in a mineral extraction system. The lockscrew may be angled relative to the tubular members, at an angle that is greater than 0 degrees and less than 90 degrees. Further, the lockscrew may have an end portion which mates with a slot in a locking segment, and the lockscrew and locking segment may be moved from an unlocked to a locked position. In a locked position, the lockscrew exerts force axially downward and radially inward to push the locking segment against a tubular member, locking the member in place. The interconnection between the lockscrew and the locking segment may enable easier installation and may utilize parts which may be easier to manufacture. Furthermore, the angle of the lockscrew may provide improved support for tubular members.

Abstract: An adjustable fracturing system is provided. In one embodiment, the system includes a fracturing manifold and a fracturing tree. A fluid conduit is coupled between the fracturing manifold and the fracturing tree to enable receipt of fracturing fluid by the fracturing tree from the fracturing manifold. Further, the fluid conduit is an adjustable fluid conduit that allows an operator to vary a dimension of the fluid conduit to facilitate coupling of the fluid conduit between the fracturing manifold and the fracturing tree. Additional systems, devices, and methods are also disclosed.

Abstract: An offshore well drilling system for drilling a subsea well, including a floating platform, an external riser extending from the subsea well, and an internal riser extending from the subsea well to the platform. The internal riser is nested within the external riser. The system also includes an external riser tension device to apply tension to the external riser. The system also includes an internal riser tension device, separate from the external riser tension device, to apply tension to the internal riser.

Abstract: A pretreatment system and method for a floating liquid natural gas (“FLNG”) facility are presented. The inlet natural gas stream flows through a membrane system to remove carbon dioxide and a heat exchanger, producing first and second cooled CO2-depleted non-permeate streams. The first cooled CO2-depleted non-permeate stream is routed to additional pretreatment equipment, while the second cooled CO2-depleted non-permeate stream is routed directly to a LNG train. Alternatively, the inlet natural gas stream may flow through a membrane system to produce a single cooled CO2-depleted non-permeate stream that is routed to the LNG train after sweetening and dehydration. Because the pretreatment system delivers the incoming gas stream to the LNG train at a lower temperature than conventional systems, less energy is needed to convert the gas stream to LNG. In addition, the pretreatment system has a smaller footprint than conventional pretreatment systems.

Abstract: 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 preventer package releasably coupled to the blowout preventer stack and comprising a second ram blowout preventer. The subsea blowout preventer stack assembly can be deployed by coupling a drilling riser to the lower marine riser package that is releasably connected to the blowout preventer stack. The lower marine riser package and blowout preventer stack are then toward a subsea wellhead and then landed on the additional blowout preventer package that is coupled to the subsea wellhead.

Abstract: A system for sampling production well production fluids from a manifold interface panel on a subsea production manifold. In some embodiments, the system includes a remotely operated vehicle, a skid coupled to the remotely operated vehicle, a sample tank supported on the skid, and a fluid transfer pump operable to convey production fluid from at least one of the production wells through the manifold interface panel into the sample tank.

Abstract: A system for rotating an element inside a pressure containing housing. In some embodiments, the mechanism includes a pressure containing housing having an opening through a wall of the housing into an internal chamber in which, in use, the element to be rotated is located, a bushing located within the opening, and a worm gear rotatably mounted in the bushing. The worm gear is offset from the axial centre of the bushing such that rotation of the bushing moves the worm gear between an extended position, wherein the thread of the worm gear engages an element in the chamber, and a retracted position, wherein the thread is disengaged from the element in the chamber.

Abstract: There is provided a chemical injection line connector including first and second couplings configured to automatically seal shut when the members are disengaged. There is further provided a method for blocking contamination or pressure transfer of chemical injection lines by securing first and second couplings to corresponding ends of a chemical injection line and automatically sealing the couplings shut when the couplings are disengaged.

Abstract: A system in some embodiments includes a system, having a seal assembly, including an inner energizing ring, an outer energizing ring, a load ring disposed between the inner energizing ring and the outer energizing ring, a sealing element, and a lock ring. Further other embodiments provide a method of sealing, including rotating an inner energizing ring in a direction to move the inner energizing ring in a first axial direction to seat a seal, rotating an outer energizing ring in the direction to wedgingly engage and set a lock ring in a radial direction, and rotating a load ring in the direction to move the load ring in a second axial direction to set the lock ring.

Abstract: A system for reducing pressure in a subsea operator. In one embodiment, a subsea system includes an operator and a deintensifier. The operator includes a housing and a piston. The piston is movably disposed within the operator housing and divides an inner volume of the operator housing into a closing chamber and a second chamber. The deintensifier is fluidically coupled to the operator. The deintensifier includes a housing and a piston. The piston includes a closing surface and an opening surface. The closing surface is fluidically coupled to the second chamber of the operator housing. The opening surface is fluidically coupled to ambient pressure. The area of the closing surface is greater than an area of the opening surface so as to increase the pressure differential between the closing chamber and the second chamber and assist in moving the operator piston to the closed position.

Abstract: A dynamic hang-off assembly for supporting a riser string from an off-shore drilling rig including a dynamic tensioning system. The hang-off assembly includes a housing with a passage through the housing. The housing also includes a locking mechanism. The assembly further includes an adapter positionable within the housing passage. The outer surface of the adapter includes a profile. The riser string is also attachable to the adapter. The locking mechanism actuates to engage the adapter profile and secure the adapter to the housing. When the riser string is connected to the adapter and the adapter is secured by the housing, the riser string is supportable by the housing. The housing is also dynamically supportable by the dynamic tensioning system to dynamically support the riser string.

Abstract: Various novel connectors are provided. In one embodiment, the connector includes a collar configured to receive first and second components. In this embodiment, the connector may also include a load ring configured to be received in a groove of the second component and to move into and out of engagement with the collar when the second component is received by the collar. The connector of this illustrative embodiment may also include a cotter configured for installation to the second component and to inhibit disengagement of the load ring from the collar. In some embodiments, engagement of the load ring and the collar effects securing of the first and second components to one another. Other devices, systems, and methods related to connectors are also disclosed.

Abstract: There is provided a hydraulic fluid control line connector including first and second couplings configured to automatically seal shut when the members are disengaged. There is further provided a method for blocking contamination or pressure transfer of hydraulic fluid control lines by securing first and second couplings to corresponding ends of a hydraulic line and automatically sealing the couplings shut when the couplings are disengaged.

Abstract: A system includes a ball valve with a housing having a fluid passage, a ball disposed within the housing along the fluid passage, and a stem coupled to the ball. The stem is configured to move the ball between an open position and a closed position relative to the fluid passage. The stem is disposed in a first opening on a first side of the housing. The stem is removable from the first opening, through at least one opening in the ball, and out through a second opening on a second side of the housing.

Abstract: A control and supply unit for an actuating device of a choke, a valve, a blow-out preventer or some other device applied in the field of oil and natural gas production. The control and supply unit includes a vibration detection means to detect vibrations caused by a conveyed flow. The conveyed flow can be controlled by the actuating device.