The protection device has a valve and a valve actuator, able to move the valve to a closed position when a pressure upstream of the valve exceeds a predetermined threshold pressure. The valve actuator includes a biaiser, to maintain the valve in an open position; an actuation mechanism, to move the valve to the closed position, the actuation mechanism with a fluid sampling passage to fluidly connect the flow line to a fluid actuated surface of the actuation mechanism. At least a rupture element preventing the passage of fluid from the flow line when the pressure upstream of the rupture element is lower than the threshold pressure, the rupture element being able to break at the threshold pressure.

A flowline jumper for providing fluid communication between first and second spaced apart subsea structures includes a length of conduit having a predetermined size and shape and first and second connectors deployed on opposing ends of the conduit. The first and second connectors are configured to couple with corresponding connectors on the subsea structures. At least one electronic sensor is deployed on the conduit. The sensor is configured to measure at least one of a vibration and a load in the conduit.

A system for hydrocarbon production comprising a host for receiving produced hydrocarbon; an offshore hydrocarbon production facility comprising: a production wellhead for connection to a subsea hydrocarbon reservoir; a production platform configured to receive produced fluid from the wellhead and being in fluid communication with the host via a long distance pipeline; wherein the wellhead is local to the production platform, and the production platform is configured to process the produced fluid to provide a semi-stable oil product suitable for exporting along the long distance pipeline to the host.

A system for hydrocarbon production comprising a host for receiving produced hydrocarbon; an offshore hydrocarbon production facility comprising: a production wellhead for connection to a subsea hydrocarbon reservoir; a production platform configured to receive produced fluid from the wellhead and being in fluid communication with the host via a long distance pipeline; wherein the wellhead is local to the production platform, and the production platform is configured to process the produced fluid to provide a semi-stable oil product suitable for exporting along the long distance pipeline to the host.

The present invention provides a nonresident system for depressurizing subsea apparatus and lines comprising a depressurizing tool (5) adapted for being coupled to an ROV interface (6) of a subsea apparatus, wherein the depressurizing tool (5) is coupled to an ROV (4), wherein: the ROV interface (6) comprises a first pipeline (6a) for connection to a first hydrocarbon transport line (8), a second pipeline (6b) for connection to second hydrocarbon transport line (9), and a connection mandrel (6d); and the depressurizing tool (5) comprises a suction line (5a) adapted for being connected to the first pipeline (6a) for connection to the first hydrocarbon transport line; a discharge line (5b) adapted for being connected to the second pipeline (6b) for connection to the second hydrocarbon transport line; a pump (5c); and a connector (5d) adapted for being connected to the connection mandrel (6d) of the ROV interface (6). A method is also provided for depressurizing subsea apparatus and lines, comprising the steps of: removing a blind cap (15) from an ROV interface (6) with aid of an ROV (4); coupling a depressurizing tool (5) to the ROV interface (6) of a subsea apparatus (10); suction and removal of fluid from a first hydrocarbon transport line, wherein the first hydrocarbon transport line comprises hydrate formation; and pressurizing and reinjecting the fluid into a second hydrocarbon transport line.

The invention relates to systems for producing oil and hydrocarbons in general, in deep water, using subsea wells and apparatus which are interconnected in a drainage and production system. In this context, the invention relates to a mandrel multiplying device (1a, 1b, 1c, 1d, 1e, 1f) suitable for providing additional points between pieces of subsea apparatus, the device comprising a connector (2) for coupling to a mandrel of a subsea apparatus (8, 9), and at least two mandrels (3, 4, 5) suitable for providing points for connection to subsea lines (J1, J1′, J1″, J2, R1, R2, A1, A2, A3) which are connected to other pieces of subsea apparatus (8, 9) or to a production unit (13).

The invention relates to systems for producing oil and hydrocarbons in general, in deep water, using subsea wells and apparatus which are interconnected in a drainage and production system. In this context, the invention relates to a mandrel multiplying device (1a, 1b, 1c, 1d, 1e, 1f) suitable for providing additional points between pieces of subsea apparatus, the device comprising a connector (2) for coupling to a mandrel of a subsea apparatus (8, 9), and at least two mandrels (3, 4, 5) suitable for providing points for connection to subsea lines (J1, J1′, J1″, J2, R1, R2, A1, A2, A3) which are connected to other pieces of subsea apparatus (8, 9) or to a production unit (13).

A pig diverter comprises a hollow housing having a flowline inlet port, a flowline outlet port, a pig entry opening, and a pig exit opening, all communicating with the interior of the housing. A tubular pig holder enclosed by the housing is pivotable between a receiving position and a launching position. In the receiving position, the pig holder is aligned with the pig entry opening to receive a pig and effects fluid communication between the pig entry opening and the flowline outlet port. In the launching position, the pig holder is aligned with the pig exit opening to launch a pig and effects fluid communication between the flowline inlet port and the pig exit opening.

A method for compensating the bathymetric pressure inside a subsea tank containing a liquid working fluid by using a bathymetric compensation fluid is provided. The liquid working fluid and the bathymetric compensation fluid are separated from each other by a separation layer of a separation fluid.

A method for compensating the bathymetric pressure inside a subsea tank containing a liquid working fluid by using a bathymetric compensation fluid is provided. The liquid working fluid and the bathymetric compensation fluid are separated from each other by a separation layer of a separation fluid.