Abstract: A method and apparatus are disclosed for reducing flow induced vibration in at least one subsea structure. The method comprises the steps of, via at least one subsea acoustic sensor (190), detecting at least one characteristic associated with acoustic energy in sea water proximate to the sensor (190), responsive to the detected characteristic, varying at least one operational parameter of a fluid flowing along a fluid flow pathway associated with a pipe member (160).

Abstract: A system includes a support structure that is configured to be positioned at a fixed location relative to a component of a mineral extraction system. The system also includes a drive assembly having a drive motor and a valve attachment, and the drive assembly is configured to move about the support structure and to actuate multiple valves of the component of the mineral extraction system.

Abstract: A subsea umbilical termination assembly comprising a base (1), said base (1) includes a core frame construction (2) with elongated sides (3, 4) onto which support plates (5, 6, 7) are mounted, wherein at least a pair of mounting rails (12, 13) are respectively secured to the core frame construction (2) along elongated sides (3, 4) and said mounting rails (12, 13) are provided with positioning elements (16, 17) to allow a modular support plate arrangement, which is fixed to the mounting rails (12, 13).

Abstract: Systems and a method for efficient downhole separation of gas and liquids. An exemplary system provides a downhole gas separator for an artificial lift system. The downhole gas separator includes a separation section. The separation section includes a number of openings over an extended length, and wherein a size of each of the openings, a number openings, or both, is increased as a distance from a production tubing is increased.

Abstract: A method and apparatus for drilling wells for producing petroleum products from an earth formation that is covered by shallow water having a depth of about 600? or less, using a self-elevating drilling unit (SEDU) to drill one or more wells having wellheads located at or near the seabed. Well drilling is accomplished through a blowout preventer stack and a drilling spool string having a wellhead connector secured at its lower end and establishing releasable connection with the subsea wellhead. As a plurality of wells are being drilled, production of petroleum products can begin from wells that have already been completed, thus initiating an income stream from petroleum production starting only a few months from initiation of well drilling activity. When a well has been drilled, completed and rendered safe, the drilling spool string and wellhead connector is removed to the SEDU, leaving the wellhead positioned at the seabed in readiness for later production.

Abstract: A subsea leak detection system for an off-shore operation facility includes a leak detector operatively connected to a controller located on a subsea assembly. The system is provided with a floating member on which the leak detector is suitably attached. The floating member is adapted to be installed and stably positioned, above the assembly.

Abstract: A downhole perforating system having a cemented-in lower completion including one or more orienting nipples, each orienting nipple having a recess key, and one or more lines or tools carried on the exterior of the lower completion and oriented relative to the recess key. The downhole perforating system also includes a perforating string having one or more blank sections oriented relative to an orienting key that is brought into alignment with the recess key when the perforating string is landed in the orienting nipple. Upon landing, the perforating string can be fired without damaging the lines or tools outside the lower completion.

Abstract: There is provided a device and method for high speed hydraulic actuation. The method includes adjusting a position of an actuator using a hydraulic pressure regulator. Adjusting the position of the actuator includes increasing pressure on the hydraulic pressure regulator to open the actuator using a first solenoid, or decreasing pressure on the hydraulic pressure regulator to close the actuator using a second solenoid.

Abstract: A method of optimizing production of wells using choke control includes generating, for each well, an intermediate solution to optimize the production of each well. The generating includes using an offline model that includes a mixed-integer nonlinear program solver and includes using production curves based on a choke state and a given wellhead pressure. The method further includes calculating, using a network model and the intermediate solution of each well, a current online wellhead pressure for each well. The method further includes setting the intermediate solution as a final solution based on determining that a difference between the current online wellhead pressure of each well and a prior online wellhead pressure of each well is less than a tolerance amount. The method further includes adjusting, using the final solution of each well, at least one operating parameter of the wells.

Abstract: A fluid treatment system comprises a fluid treatment module having a fluid inlet and first and second fluid outlets. A pump is provided to establish a first pressure differential between the fluid inlet and one of the first and second fluid outlets of the fluid treatment module, and an eductor is provided to establish a second pressure differential between the fluid inlet and the other of the first and second fluid outlets of the fluid treatment module. The pump is adapted to deliver a motive fluid to the eductor.

Abstract: A subsea production system, comprising a plurality of wells located on a sea floor, the wells producing a fluid comprising hydrocarbons; a cold flow center on the sea floor, the cold flow center fluidly connected to the plurality of wells; and a production facility on land or on a floating structure, the production facility fluidly connected to the cold flow center; wherein the cold flow center lowers a temperature of the fluid and produces a slurry of the fluid and suspended solids for transportation to the production facility.

Abstract: Systems, devices, and methods for providing proper spacing and alignment of multi-well modular drilling templates and associated wells are provided. An example embodiment of a system includes a primary well upon which a multi-well modular drilling template is landed, and a second well upon which a specially configured spacer device is landed. The spacer device includes an alignment frame which engages guide arms of the template to force the spacer device into proper axial alignment. The spacer device includes an elongated arm and a guide funnel which provide the proper spacing and proper location for inserting a third well. The third well can be used as the central well for a second multi-well modular drilling template.

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 method of drilling and producing from an offshore structure, comprising drilling a first well from the offshore structure with a drilling riser; completing the first well with a first subsurface tree; connecting the first subsurface tree to a manifold; drilling a second well from the offshore structure with a drilling riser; completing the second well with a second subsurface tree; connecting the second subsurface tree to the manifold; and connecting a production riser to the manifold and the offshore structure.

Abstract: A mobile water injection system and method for performing waterflooding in offshore reservoirs, and more particularly to enhance oil recovery in marginal offshore reservoirs is disclosed. The mobile water injection system and method include portable equipment, including a submersible pump to recover water from a body of water, a water storage tank, filtration and chemical treatment equipment to treat the recovered water, and an injection pump to pump the treated water at high pressure into the reservoir such that the residual oil is driven to adjacent production wells to increase oil recovery.

Abstract: Disclosed herein is a valve. The valve includes a first member having a first port therethrough, a second member in operable communication with the first member having a sealing surface thereon and a second port therethrough that is movable relative to the first member. The valve also has a seal sealingly engaged with the first member and slidably sealingly engagable with the second member, and a support member movably disposed relative to the first member and the second member. The support member has a support surface dimensioned similarly to the sealing surface, and is movable with the second member relative to the first member so that upon such movement the seal is continuously supported by at least one of the sealing surface and the support surface.

Abstract: An offshore oil production system, comprising a structure in a body of water, having a portion extending above a surface of the body of water; a wellhead located at a boom of the body of water; a riser extending from the wellhead to the portion extending above the surface; a primary wellbore extending into a subsea formation beneath the body of water; and at least two secondary wellbores extending further into the subsea formation beneath the body of water and beneath the primary wellbore.

Abstract: A subsea production and separation system comprising a subsea well drilled into a sea floor; a subsea tree located on the sea floor at a top portion of the subsea well; a manifold located on the sea floor; a well jumper connecting the subsea tree and the manifold; a first sled located on the sea floor; a second sled located on the sea floor; a separator located on the sea floor; a first flowline jumper connecting the manifold to the separator; a second flowline jumper connecting the manifold to the separator; a third flowline jumper connecting the separator to the first sled; a fourth flowline jumper connecting the separator to the second sled; a liquid export line connected to the third flowline jumper; and a gas export line connected to the fourth flowline jumper.

Abstract: The disclosure provides a method and system of installing subsea well trees, comprising: creating a glory hole having a depth below a seabed at a well location of a hydrocarbon reservoir; moving a floating offshore platform coupled with a foundation, the platform having a topsides and a caisson with downwardly extending walls defining an inner volume between the walls, the foundation coupled to the caisson walls, and the caisson walls having adjustable buoyancy; lowering the offshore platform with the foundation into the glory hole; drilling from the topsides into the hydrocarbon reservoir below the foundation to create a well; installing a well tree on the well, the well tree being disposed in the glory hole below the height of the seabed; coupling the well tree to a flow line; releasing the offshore platform from the foundation; and reusing the offshore platform to install other foundations at other predetermined well locations.

Abstract: A whipstock system for drilling a wellbore from a water bottom supported platform having wellbores with conductor pipes disposed through guide slots in a template on the bottom of a body of water includes a whipstock pipe extending from an equipment deck surface on the platform to a stab in sub. The whipstock pipe includes a window and j-slot mechanism for releasably engaging a scab liner. A stab in sub is configured to make mechanical connection between the whipstock pipe and a surface of a wellbore conductor pipe cut proximate the water bottom. The system includes a scab liner extending from the window to the water bottom when the stab in sub is engaged to the cut conductor pipe. The window is disposed above the water bottom. The scab liner configured to enable drilling a wellbore surface hole therethrough to a selected depth of a surface casing.

Abstract: A mobile water injection system and method for performing waterflooding in offshore reservoirs, and more particularly to enhance oil recovery in marginal offshore reservoirs is disclosed. The mobile water injection system and method include portable equipment, including a submersible pump to recover water from a body of water, a water storage tank, filtration and chemical treatment equipment to treat the recovered water, and an injection pump to pump the treated water at high pressure into the reservoir such that the residual oil is driven to adjacent production wells to increase oil recovery.

Abstract: A subsea oil and/or gas production system comprises a host production facility and a plurality of subsea wells. A fluid conveying network is provided that connects each subsea well to the host production facility. A separate electrical power and data network is provided for conveying direct current electrical power and data, operatively connected to each subsea well for providing each subsea well with data transfer and electrical power services. The use of direct current ensures that the electrical power and data network can provide power over much greater distances than currently available, and the use of separate networks for conveying fluids and for providing electrical power and data transfer allows for a much more flexible system.

Abstract: There is herein described the prevention of hydrates and the provision of a Relief Well in an oil and gas Well. More particularly, there is described the prevention of hydrates in an oil and gas Well by utilizing the latent heat in the sub-soil and providing Subterranean Channels to facilitate the provision of Relief Well access.

Abstract: A production flow base (1) for possible future branched connection onto a production manifold (10) in order to provide for the connection of at least two production jumpers extending from respective subsea Xmas trees onto the production manifold (10), is shown. The production flow base (1) is arranged as a retrofit module connectable to a single inboard hub (11) prearranged on the production manifold (10). The production flow base (1) includes a frame structure (2), piping (3), at least one connector (4) and guiding means (9). The frame structure (2) is arranged for landing on a supporting arrangement (12) projecting from a manifold structure (10). The piping (3) forms a branch terminating in a connector (4) and at least two outboard hubs (6).

Abstract: The invention relates to a manifold structure that includes a frame construction (1), a number of pipes (2), a pipe bend and possible valves, deployed in a pipe system having a number of pipe terminations projecting from the frame construction. The frame construction (1) is designed with a number of support brackets (5) for respective coupling parts associated with said pipe terminations. Each support bracket (5) is made as a separate, standardized unit that includes several securing means for releasable assembly to the frame construction, where each securing means is arranged for defined adjustability in height and lateral direction for adaption to a preinstalled pipe termination.

Abstract: An offshore oil production system, comprising a structure in a body of water, having a portion extending above a surface of the body of water; a first surface wellhead located at a top of the body of water; a second surface wellhead located at a top of the body of water; a first wellhead located at a bottom of the body of water; a second wellhead located at a bottom of the body of water; a first riser extending from the first wellhead to the first surface wellhead; and a second riser extending from the second wellhead to the second surface wellhead; wherein the first surface wellhead is a distance of less than about 12 feet from the second surface wellhead.

Abstract: A method of enabling communication between components of a hydrocarbon extraction plant, the plant having an underwater hydrocarbon extraction installation including at least one hydrocarbon extraction well with an associated tree, comprises providing a plurality of RF communication means at respective components of the installation.

Abstract: An offshore oil production system, comprising a structure in a body of water, having a portion extending above a surface of the body of water; a wellhead located at a boom of the body of water; a riser extending from the wellhead to the portion extending above the surface; a primary wellbore extending into a subsea formation beneath the body of water; and at least two secondary wellbores extending further into the subsea formation beneath the body of water and beneath the primary wellbore.

Abstract: A method for managing hydrates in a subsea production system is provided. The production system includes a host production facility, a control umbilical, at least one subsea production well, and a single production line. The method generally comprises producing hydrocarbon fluids from the at least one subsea production well and through the production line, and then shutting in the production line. In addition, the method includes the steps of depressurizing the production line to substantially reduce a solution gas concentration in the produced hydrocarbon fluids, and then repressurizing the production line to urge any remaining gas in the free gas phase within the production line back into solution. The method also includes displacing production fluids within the production line by moving displacement fluids from a service line within the umbilical line and into the production line. The displacement fluids preferably comprise a hydrocarbon-based fluid having a low dosage hydrate inhibitor (LDHI).

Abstract: A well completion system for monitoring multiple annuluses in a well, including an “A” annulus (between the production tubing and production casing) and a “B” annulus (between the production casing and intermediate casing). The system includes a tubing hanger suspension assembly that seals and separates an upper area of the production annulus. Port(s) in the production casing above the seal provide access between the “B” annulus and the separated area. The system also includes a moveable sleeve that allows fluid communication through the port(s) when in an open position, but not in a closed position. The tubing hanger suspension assembly includes means for moving the sleeve from the closed position to the open position. In addition, the tubing hanger housing includes “A” and “B” annulus passageways in communication with the production annulus and the separated area, respectively.

Abstract: System and method for controlling a blowout preventer (BOP) stack and a tree attached to a wellhead of a well. The system includes at least a MUX pod configured to receive electrical signals and a fluid under pressure, and to provide a first set of functions to the LMRP part, and a second set of functions to a lower BOP part; a pod extension module configured to receive the fluid under pressure from the MUX pod, and to provide a third set of functions to the tree based on the received fluid under pressure; and a control part configured to be attached to the tree and to communicate with the pod extension module. The third set of functions for the tree is different from the second set of functions provided to the lower BOP part.

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 variable buoyancy subsea running tool for use with subsea transportable devices, such as a tree cap. The buoyancy of the running tool may be varied through fluid or gas displacement in one or more containers. Alternatively, the running tool may be configured with a buoy that has static buoyancy, with the buoyancy of the running tool being varied through the addition of a counterweight. The running tool can be used to install or uninstall a tree cap on a subsea tree. Installation of a tree cap may be actuated by a remotely operated vehicle. Additionally, the running tool may be moved by a remotely operated vehicle and may have additional features such as a position locator device.

Abstract: A system comprising a floating host located over a first drilling center in a body of water, the floating host comprising drilling facilities; a floating spar located over a second drilling center; a first fluid transfer conduit between the second drilling center and the spar; and a second fluid transfer conduit between the spar and the floating host.

Abstract: Methods for developing an offshore field comprising deploying a lead drilling and production vessel to a offshore field to drill and complete at least one well. Production from the at least one well is initiated and evaluated. A secondary production vessel is selected based upon the evaluated production and is deployed to the offshore field to replace the lead drilling and production vessel and support production of the at least one well.

Abstract: Method of managing hydrates in a subsea production system that includes a host production facility, one or more producers, one or more water injectors, a water injection line, and a single production line for directing production fluids from the producers to the host production facility. The method comprises placing a pig in the subsea production system, shutting in production from the producers, and injecting a displacement fluid into the subsea production system in order to displace production fluids in the production line. The method also includes applying electrically resistive heat along a selected portion of the single production line to maintain production fluids within the production line at a temperature above a hydrate formation temperature after production has been shut in.

Abstract: An arrangement related to subsea electric power distributing AC-system and adapted for a subsea application. The arrangement is enclosed in a watertight casing. The casing exposes a main power input connection, adapted for watertight co-ordination with a first subsea cable and a main power output connection, adapted for a watertight co-ordination with a second subsea cable. The second subsea cable is adapted for a power supply to an AC-current and AC-voltage adapted device. The arrangement includes interconnected: a voltage regulator connected to the first cable, and a NO-load switching unit connected to the second cable, and a control unit. The control unit is adapted, in a first operative mode, to regulate the output AC-voltage from the voltage regulator towards and to zero, or at least almost to zero, and in a second subsequent operative mode, to bring the NO-load switching unit from an ON-position to an OFF-position or vice versa.

Abstract: Subsea well template comprising a plurality of well slots arranged adjacent to a manifold reception space, said template comprising a plurality of template hatches for protection of well components, including a Xmas tree. Said hatches comprise at least a top protection cover and a side protection panel. The hatches are arranged to pivot between a closed and open position, about a pivot axis arranged at a lower end of the hatch. When in an open position, the well template exhibits absence of a framework extending up towards the top of the template.

Abstract: A subsea oil and/or gas production system comprises a host production facility and a plurality of subsea wells. A fluid conveying network is provided that connects each subsea well to the host production facility. A separate electrical power and data network is provided for conveying direct current electrical power and data, operatively connected to each subsea well for providing each subsea well with data transfer and electrical power services. The use of direct current ensures that the electrical power and data network can provide power over much greater distances than currently available, and the use of separate networks for conveying fluids and for providing electrical power and data transfer allows for a much more flexible system.

Abstract: The technical challenges for a smooth transition between using both a thermodynamic hydrate inhibitor (THI) and a kinetic hydrate inhibitor (KHI) to simply using only the KHI in multiple tie-in gas natural gas production systems is solved by adding more THI in a first pipeline leg of the production system while ceasing adding THI in a second pipeline leg of the system. Further, more KHI is added into the second leg of the system, and subsequently THI is gradually and/or slowly reduced in the remaining legs of the system until only KHI is being injected, after which the KHI amount in all legs may be reduced to the equilibrium or steady-state levels.

Abstract: A system for supporting multiple-well-site, offshore, hydrocarbon-bearing fields, each well-site has one or more wells. In general, the system first comprises a floating vessel that is relocatable from a first subsea well-site to a second subsea well-site. The system also comprises two separate systems: (1) an operations control system for providing subsea well-site operations such as power and communications; and (2) an intervention system for conducting intervention services to an individual subsea well such as workover services and maintenance services. The operations system may provide control to wells and other subsea equipment at either the first well-site or the second well-site, regardless of the location of the floating vessel. The intervention system may provide workover and/or maintenance to subsea equipment or individual wells at the well-site at which it is located.

Abstract: A method of drilling and producing from an offshore structure, comprising drilling a first well from the offshore structure with a drilling riser; completing the first well with a first subsurface tree; connecting the first subsurface tree to a manifold; drilling a second well from the offshore structure with a drilling riser; completing the second well with a second subsurface tree; connecting the second subsurface tree to the manifold; and connecting a production riser to the manifold and the offshore structure.

Abstract: A technique is provided for control of subsea well systems. The technique utilizes a subsea controller coupled to a plurality of subsea well system components to allow localized control of the subsea well system. The subsea controller can be used in a variety of functional applications, such as balancing power distribution to subsea components.

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 comprising a surface installation in position above a plurality of subsea wells disposed within the watch circle of the surface installation. A plurality of flowlines directly couple at least one of the plurality of subsea wells to the surface installation. A control station, a hydraulic power unit, and an injection unit are disposed on the surface installation. A distribution body is disposed on the seafloor and is coupled to each of the control station, hydraulic power unit, and the injection unit via one or more umbilicals. A first wellhead component is disposed on one of the subsea wells and is coupled to the distribution body via one or more flying leads that provide electrical, hydraulic, and fluid communication. A second wellhead component is disposed on another one of the subsea wells and coupled to the distribution body via one or more flying leads that provide electrical, hydraulic, and fluid communication.

Abstract: A system for assuring subsea hydrocarbon production flow in pipelines by chilling the hydrocarbon production flow in a heat exchanger and causing solids to form, periodically removing deposits and placing them in a slurry utilizing a closed loop pig launching and receiving systems.

Abstract: A booster pumping system is disclosed for producing hydrocarbons from a subsea production well. The booster pumping system includes: (1) a submersible pump hydraulically connected to the production well to provide energy to the hydrocarbon flow and boost production to another destination such as a subsea production facility or the surface via a riser; (2) an inlet conduit to receive the flow from the production well and isolate the flow from the dummy wellbore and direct the flow to the intake of the pump; and (3) a motor exposed to the dummy wellbore to drive the pump. The dummy wellbore may be flooded or circulated with seawater to cool the motor.

Abstract: The present invention relates to overpressure protection systems and methods for use on a production system for transferring hydrocarbons from a well on the seafloor to a vessel floating on the surface of the sea. The production system includes a subsea well in fluid communication with a turret buoy through a production flowline and riser system. The turret buoy is capable of connecting to a swivel located on a floating vessel. The overpressure protection device is positioned upstream of the swivel, to prevent overpressure of the production swivel and downstream components located on the floating vessel. The device may include one or more shut down valves, one or more sensors, an actuator assembly, and a control processor.

Abstract: A marine riser system for transferring fluid between a well on the seafloor and a vessel floating on the surface of the sea. The riser system has a turret buoy capable of connecting to a floating vessel; two or more hybrid risers, each of the hybrid risers having a vertical riser, a riser buoy attached to the upper portion of the vertical riser and a flexible jumper connecting the riser buoy to the turret buoy, and wherein the hybrid risers are secured to the seafloor. A flowline may connect a lower portion of each of the vertical risers to a subsea manifold, which interconnects the flowline and a subsea well. The subsea manifold is capable of controlling the flow to or from a subsea well. The hybrid risers are positioned about the turret buoy so that the turret buoy is horizontally balanced while disconnected from a vessel. In another embodiment, the marine riser system is capable of directing a fluid from the floating vessel to a subsea export flowline.

Abstract: The present invention relates to overpressure protection systems and methods for use on a production system for transferring hydrocarbons from a well on the seafloor to a vessel floating on the surface of the sea. The production system includes a subsea well in fluid communication with a turret buoy through a production flowline and riser system. The turret buoy is capable of connecting to a swivel located on a floating vessel. The overpressure protection device is positioned upstream of the swivel, to prevent overpressure of the production swivel and downstream components located on the floating vessel. The device may include one or more shut down valves, one or more sensors, an actuator assembly, and a control processor. Each shut down valve and sensor is coupled to a production flowline. Each of the sensors is capable of generating a signal based upon a pressure sensed within the production flowline. The actuator assembly is connected to each of the shut down valves for operating the shut down valves.