Abstract: A method for abandonment of a subsea well includes: setting a packer of a lower cementing tool against a bore of an inner casing at a location adjacent to an outer casing; fastening a pressure control assembly (PCA) to the subsea wellhead; hanging an upper cementing tool from the PCA and stabbing the upper cementing tool into a polished bore receptacle of the lower cementing tool; perforating a wall of the inner casing below the packer; perforating the inner casing wall above the packer by operating a perforator of the upper cementing tool; and pumping cement slurry followed by a release plug through bores of the cementing tools. The release plug engages and launches a cementing plug from the lower cementing tool. The cementing plug drives the cement slurry through the perforations below the packer and into an inner annulus formed between the inner casing and the outer casing.

Abstract: A method for abandonment of a subsea well includes: fastening a pressure control assembly (PCA) to a subsea wellhead; and deploying a tool string into the PCA. The tool string includes a packer and an upper perforator located above the packer. The method further includes: closing a bore of the PCA above the tool string with a solid barrier; and setting the packer against an inner casing hung from the subsea wellhead. The method further includes, while the PCA bore is closed, perforating a wall of the inner casing by operating the upper perforator. The method further includes injecting cement slurry into an inner annulus formed between the inner casing and an outer casing hung from the subsea wellhead.

Abstract: A method of capturing flow discharged from a subsea blowout or oil seep includes lowering a collector from a mobile offshore drilling unit (MODU) onto a seafloor at a location distant from subsea equipment blowing production fluid. A workstring is connected to the collector and an inert gas is injected through the workstring. The collector is landed onto the subsea equipment while maintaining the injection of inert gas. The inert gas injection is halted and a top of the workstring is routed to surface collection equipment, thereby directing the blowing production fluid from the subsea equipment, into the collector, and through the workstring to the MODU.

Abstract: A collector for capturing flow discharged from a subsea blowout includes a tubular housing having a containment chamber; a seal connected to the housing; a tubular chimney connected to the housing, having a portion of a subsea connector, and having a diameter less than a diameter of the containment chamber; and a head connected to the housing and the chimney.

Abstract: A method for riserless intervention of a subsea well includes: lowering a pressure control assembly (PCA) from a vessel to a subsea production tree; fastening the PCA to the tree; lowering a control pod from the vessel to the PCA using an umbilical; fastening the control pod to the PCA; lowering an end of a fluid conduit from the vessel to the PCA; and fastening the fluid conduit to the PCA using a dry break connection.

Abstract: In one embodiment, dispersants are injected directly into a plume of oil in a subsea environment. The dispersant is supplied from a vessel, through a tubular string and flows through a routing manifold into a flexible hose. The hose then transports the dispersant to a distribution manifold, which is disposed on the sea floor, and permits injection of dispersants at multiple locations at the same time around the leaking oil. Injection of dispersants from the distribution manifold may be through injection wands, or the dispersant may be transferred to a containment or collection device located above the plume of oil, wherein nozzles are disposed around the circumference of such containment or collection device. If the dispersants are injected into the leaking oil through injection wands, such wands may be held and/or manipulated by an ROV.

Abstract: A method for abandonment of a subsea well includes: fastening a pressure control assembly (PCA) to a subsea wellhead; and deploying a tool string into the PCA. The tool string includes a packer and an upper perforator located above the packer. The method further includes: closing a bore of the PCA above the tool string with a solid barrier; and setting the packer against an inner casing hung from the subsea wellhead. The method further includes, while the PCA bore is closed, perforating a wall of the inner casing by operating the upper perforator. The method further includes injecting cement slurry into an inner annulus formed between the inner casing and an outer casing hung from the subsea wellhead.

Abstract: A system for supplying a chemical dispersant to a subsea hydrocarbon discharge site comprises a dispersant source and a dispersant pump configured to pump dispersant from the dispersant source. In addition, the system comprises a first flow line coupled to the pump. Further, the system comprises a subsea dispersant distribution system coupled to the first flow line. Still further, the system comprises a dispersant injection device coupled to the distribution system and configured to inject dispersant from the dispersant source into a subsea hydrocarbon stream.

Abstract: A subsea connection device for connecting to an existing subsea joint comprises a body having a central axis, a first end, a second end opposite the first end, and a throughbore extending axially from the first end to the second end. The first end comprises a connector configured to couple the body to a capping stack. In addition, the device comprises a seal element mounted in the throughbore at the second end of the body. Further, the device comprises a latching assembly disposed about the second end of the body. The latching assembly includes a base coupled to the body and a plurality of circumferentially spaced latching members pivotally coupled to the base.

Abstract: Embodiments of the present invention generally relate to a casing tester for plugging and abandoning a wellbore. In one embodiment, a method of testing an annulus defined between a first tubular string and a second tubular string includes engaging a first annular packer with an outer surface of the first tubular string and engaging a second annular packer with an outer surface of the second tubular string. The tubular strings extend into a wellbore. The method further includes injecting a test fluid between the packers until a predetermined pressure is exerted on the annulus.

Abstract: Embodiments of the present invention generally relate to a subsea salvage operation using a lifting magnet. In one embodiment, a method of salvaging a submerged production platform includes deploying a salvage vessel to a wreckage site of the submerged production platform; lowering a lifting magnet from the salvage vessel to the submerged production platform; and activating the lifting magnet, thereby capturing at least a portion of the submerged production platform.

Abstract: Well bore drill string shock absorber device for absorbing drill bit vibratory displacement shock, contemplating a pair of slidably, e.g. telescopingly, associated longitudinal elements, one of which is connectable to a drill string therabove and the other of which is connectable to a drill bit therebelow, such elements being interengageably interconnected for common rotation about a longitudinal, e.g. well bore, axis and for selectively limited relative reciprocal displacement longitudinally with respect to each other along such axis, and such elements together defining a shock absorber work chamber within longitudinal confinement wall portions thereof, e.g. an annular cylindrical chamber, of varying selective maximum and minimum operative longitudinal dimension and corresponding volume in dependence upon such displacement of the elements and in turn of such wall portions, and temporarily internally compressible and resilient shock absorbing means, e.g.

Abstract: Well bore drilling shock absorber device for absorbing drill bit vibratory displacement shock, especially in elevated temperature formation drilling, in which the pair of slidably associated elements, e.g. telescoping inner mandrel and outer housing, interconnected for common rotation for drilling purposes and relative reciprocal displacement longitudinally for shock absorbing purposes, and adapted to be interposed operatively between a drill string thereabove and a drill bit therebelow, is provided with longitudinally resilient mechanical tension shock absorbing means, e.g. linear means or cable means such as wire rope, rods, tubes, chains, etc.