A technique facilitates pressure testing of a seal positioned between a wellhead and a subsea tree system. The technique utilizes an isolation sleeve which may comprise a mandrel having an internal mandrel passage as well as a lower seal and an upper seal positioned along an exterior of the mandrel. The isolation sleeve also may comprise a retention member mounted along the exterior of the mandrel. The retention member, e.g. a retention nut, may be rotatably mounted about the exterior of the mandrel and may comprise external threads or other mechanism for securing the isolation sleeve to the subsea tree system. In some embodiments, the upper end of the isolation sleeve may be constructed in a uniform manner for insertion into a universal profile of the subsea tree system.

Initiating an emergency shutdown and disconnect (ESD) sequence for subsea well systems includes measuring an angle of the tubular member (22) with respect to vertical using a sensor (96) that is coupled to the tubular member (22). It will also be determined by a controller (48) whether the angle exceeds a predetermined threshold for a predetermined amount of time. The ESD sequence is initiated when the angle exceeds the predetermined threshold for the predetermined amount of time.

A subsea flowline jumper connector includes at least one electronic connector deployed thereon. The sensor may provide data indicative of the connector state during installation and production operations.

A monitoring system and method for elongate subsea structures are disclosed. The structure monitoring apparatus comprises a strain gauge secured to the riser at a defined location which communicates signals indicative of actual strain values experienced by the riser information processing means to an information processing means in communication with a pre-compiled, theoretically determined, discretised bending moment variation matrix. After receiving and compiling sufficient data to form a profile of the bending moment variation occurring at the defined location or site of the monitoring apparatus, the information processing means interrogates the bending moment matrix, using the known bending moment variation profile at the site of the apparatus, along with the known location of the apparatus on the riser, to estimate the bending moment variations at various other locations along the length of the riser. In one embodiment, as the depth of the riser and thus the apparatus can vary due to subsea tidal, eddy and other effects, the information processing utilizes the bending moment variation matrix to create an envelope of possible bending moment variations at a particular point on the riser remote from the site of the monitoring apparatus by retrieving the multiple possible values of likely actual bending moment variation occurring at said particular point for many if not all possible depths. The maximum bending moment variation value in the envelope of values so determined is then selected as the likely actual bending moment variation value for the particular point. Finally, the bending moment variation values are translated into fatigue damage per cycle, for example using a Miner-Palmgren algorithm, and such values may then be aggregated to provide a total damage sustained at any location along the riser.

The present invention generally relates to methods and apparatus for subsea well intervention operations, including retrieval of a wellhead from a subsea well. In one aspect, a method of performing an operation in a subsea well is provided. The method comprising the step of positioning a tool proximate a subsea wellhead. The tool has at least one grip member and the tool is attached to a downhole assembly. The method also comprising the step of clamping the tool to the subsea wellhead by moving the at least one grip member into engagement with a profile on the subsea wellhead. The method further comprising the step of applying an upward force to the tool thereby enhancing the grip between the grip member and the profile on the subsea wellhead. Additionally, the method comprising the step of performing the operation in the subsea well by utilizing the downhole assembly. In another aspect, an apparatus for use in a subsea well is provided. In a further aspect, a method of cutting a casing string in a subsea well is provided.

An apparatus comprising an inlet, an outlet, and a flow path extending between the inlet and the outlet; a flow meter configured to determine a flow rate of a fluid through the flow path; a choke configured to vary the flow rate of the fluid through the flow path; a frame; one or more sensing elements; and a subsea monitoring module comprising a controller configured to receive and process data from the one or more sensing elements, characterized in that: the flow path, the flow meter, the choke, the one or more sensing elements, and the subsea monitoring module are coupled with the frame such that the apparatus can be deployed to or retrieved from a subsea location in a single operation, and wherein the subsea monitoring module is disposed within a removable housing to allow separate retrieval of the subsea monitoring module from the apparatus while the apparatus is mated with a separate subsea device.

The present invention relates to an apparatus for inspecting and monitoring flexible collection and production lines in real time, rendering possible constant tracking of the condition of the internal structures of a flexible riser, specifically of the tensile armour thereof.

The device may be provided at any point along the riser ensuring the establishment of an area of physical and visual contact directly over the surface of the tensile armour of the riser for the installation of equipment for analysis, which area permits further accesses without destroying the sealing of the chamber there formed.