A system for fluid transfer is disclosed and includes a floatable buoy, an underwater hose, a plurality of underwater node units and circuitry. The underwater hose has a first end coupled to the floatable buoy and a second end. The plurality of underwater node units distributed along the length of the underwater hose and configured to generate positioning signals. The circuitry is configured to determine a relative distance between each of the plurality of undersea node units based on the generated positioning signals to generate a plurality of relative distances.

In a subsea blowout preventer stack system having a structural system and one or more accumulators providing a pressurized hydraulic supply wherein the accumulators comprise a compressed gas supply and a hydraulic fluid chamber in one or more vertical bottles, a method of using the one or more vertical bottles of the accumulators as structural members of the structural system.

A pressure rated well annulus fluid expansion storage device that is capable of managing pressure variation within a well annulus by removing or adding fluid to the well annulus. The well annulus fluid expansion storage device includes an annulus fluid expansion unit containing a well annulus fluid and a working fluid, the annulus fluid expansion unit further includes a moveable partition maintaining the working fluid and the well annulus fluid in separate chambers, a working fluid storage tank that stores the working fluid, an adjustable pressure control valve that maintains a pressure of the working fluid, a working fluid pump that feeds and pressurizes working fluid from the working fluid storage tank into the annulus fluid expansion unit, a check valve that allows flow of working fluid from the working fluid storage tank to the annulus fluid expansion unit, and a flow line for receiving and discharging well annulus fluid.

A subsea hydrocarbon flow compression system (100) for receiving a hydrocarbon stream from at least one upstream flowline (102, 104) and supplying the hydrocarbon stream to at least one downstream flowline (106, 108) at an increased pressure, wherein the compression system comprises first and second compressor trains (110a, 110b), wherein each compressor train comprises an inlet port (112a, 112b) which is connectable to the at least one upstream flowline (102, 104); an outlet port (114a, 114b) which is connectable to the at least one downstream flowline (106, 108); a conditioning unit (116a, 116b) which is connected to the inlet port via a first flowline (118a, 118b); and a first flow path for the hydrocarbon fluid comprising a compressor (120a, 120b), which compressor is connected to the conditioning unit via a second flowline (122a, 122b) and to the outlet port via a third flowline (124a, 124b), wherein a controllable first valve (126) is arranged in the third flowline of the first compressor train for controlling hydrocarbon flow from the compressor to the outlet port of the first compressor train. A controllable second valve (128) is arranged in the second flowline of the second compressor train for controlling hydrocarbon flow from the conditioning unit to the compressor of the second compressor train. The system further comprises a first cross-over flowline (130) interconnecting the third flowline of the first compressor train upstream of the first valve and the second flowline of the second compressor train downstream of the second valve, wherein a controllable first cross-over valve (132) is arranged in the first cross-over flowline for controlling hydrocarbon flow through the first cross-over flowline.

The present invention relates to a linkage test apparatus for deepwater drilling riser and hang-off system. The linkage test apparatus includes a motion excitation system, a hang-off system and a riser system. The motion excitation system includes a six-degree-of-freedom excitation platform and sensors. The hang-off system includes a hydraulic cylinder actuating mechanism and a hydraulic system. The hydraulic cylinder in the hydraulic cylinder actuating mechanism is composed of an inner cylinder and an outer cylinder and it is fixed on the six-degree-of-freedom excitation platform by a spider. The inner cylinder of the hydraulic cylinder is hollow. A hang-off joint passes through the center of the inner cylinder, and a bottom of the hang-off joint is connected to the riser system via a rotating flange. The riser system is successively connected by multiple riser test joints, and the bottom is suspended with a lower marine riser package model.

Systems and methods for casing drilling riserless sections of a subsea bore may include casing drilling a section of a bore for a casing of the subsea bore to a predetermined depth. The method also may include, while casing drilling the section of the bore, obtaining information indicative of pore pressure and fracture pressure of a geological formation through which the section is casing drilled, and determining a pressure range based at least in part on the pore pressure, the fracture pressure, and a modification to mechanical properties of the geological formation due to the casing drilling of the section. The method further may include selecting, based at least in part on the pressure range and the predetermined depth, a pressure of the bore for casing drilling the section.

The present invention provides a centrifugal pump for heating fluid by eddy current comprising a volute (29) and a cover (34), in which internally regarding the volute (29) there are provided: an impeller (33) positioned between two supporting annular disks (32) of magnets each comprising a plurality of permanent magnets (31); and two armatures (30) positioned at the ends of the internal assembly. In addition, the invention also provides a subsea tool for fluid heating by eddy current comprising: a centrifugal pump (1) driven by a hydraulic motor (3) by means of a shaft (11); a fluid storage tank (2) hydraulically connected to the centrifugal pump (1); at least one piloted on-off valve (4); piloted directional valves (12, 13); and a filter (7) hydraulically connected to the centrifugal pump (1).

It is disclosed a satellite well structure (300) and method for expanding a subsea satellite well system. The subsea satellite well structure (300) comprising:—a seabed-based foundation (330) supporting a subsea wellhead (340);—a first landing position (310) configured to receive a Christmas tree module (200) for interfacing the subsea wellhead (340);—a second landing position (320) configured to receive a subsea connection module (100) for connecting the Christmas tree module (200) to a hydrocarbon fluid export flowline; and—a plurality of Christmas tree guide posts configured to support the installation of the Christmas tree module; wherein the first landing position has a landing envelope defined by the plurality of Christmas tree guide posts, and wherein the second landing positions is arranged offset the landing envelope of the first landing position, (allowing:—the subsea connection module (100) to be landed on and retrieved from the seabed-based well structure (300) with the Christmas tree module (200) landed in the first landing position (310); and—the Christmas tree module (200) to be landed on and retrieved from the seabed-based well structure (300) with the subsea connection module (100) landed in the second landing position (320).

A system for tethering a subsea structure includes an anchor embedded in the sea bed, a mud mat disposed partially above the seafloor, a link attached to the anchor and to the mud mat, and a flexible tension member. One end of the flexible tension member is coupled to a tensioning system configured to pay in and pay out the flexible tension member. The tensioning system is mounted on one of the subsea structure or on the mud mat. The other end of the flexible tension member is coupled to the other of the subsea structure or on the mud mat. The anchor may optionally be buried below the seafloor.

An unmanned production platform comprises apparatus for producing and processing hydrocarbons from a subsea reservoir. A storage vessel is provided in combination with and proximate to the platform, typically just outside the safety zone. The storage vessel provides storage for hydrocarbons produced at the platform and further provides a utility for use at the platform, such as chemical storage, liquid desiccant regeneration and/or seawater treatment. Typically, the unmanned production platform comprises no utilities and all utilities require for production are provided by the storage vessel.