EP3271542B1 - Self positioning floating platform and method of use - Google Patents
Self positioning floating platform and method of use Download PDFInfo
- Publication number
- EP3271542B1 EP3271542B1 EP16769435.5A EP16769435A EP3271542B1 EP 3271542 B1 EP3271542 B1 EP 3271542B1 EP 16769435 A EP16769435 A EP 16769435A EP 3271542 B1 EP3271542 B1 EP 3271542B1
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- European Patent Office
- Prior art keywords
- platform
- riser
- floating platform
- moveable
- fin
- Prior art date
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Images
Classifications
-
- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21B—EARTH OR ROCK DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B15/00—Supports for the drilling machine, e.g. derricks or masts
- E21B15/02—Supports for the drilling machine, e.g. derricks or masts specially adapted for underwater drilling
-
- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21B—EARTH OR ROCK DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B15/00—Supports for the drilling machine, e.g. derricks or masts
- E21B15/003—Supports for the drilling machine, e.g. derricks or masts adapted to be moved on their substructure, e.g. with skidding means; adapted to drill a plurality of wells
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B63—SHIPS OR OTHER WATERBORNE VESSELS; RELATED EQUIPMENT
- B63B—SHIPS OR OTHER WATERBORNE VESSELS; EQUIPMENT FOR SHIPPING
- B63B35/00—Vessels or similar floating structures specially adapted for specific purposes and not otherwise provided for
- B63B35/44—Floating buildings, stores, drilling platforms, or workshops, e.g. carrying water-oil separating devices
- B63B35/4413—Floating drilling platforms, e.g. carrying water-oil separating devices
Definitions
- Offshore drilling rigs are often located in harsh sea environments. Often times, workers on a drilling rig are required to perform "work over the side,” which is work that is performed in an open area of the drilling rig platform.
- work over the side is when workers are working in a moon pool area of a drilling rig platform and attaching umbilical lines to a riser string that is being lowered through the moon pool area.
- safety regulations may require a rescue boat to be deployed in the sea during the time in which the work is being performed.
- sea conditions may become so harsh that the rescue boat cannot be deployed, thus preventing the "work over the side” from being performed. This results in loss of drilling rig time and added expenses. Accordingly, it would be desirable to provide systems and methods to address "work over the side” issues.
- An offshore working platform is for instance known from US-A-4,068,487 disclosing a complicated platform having several layers of rails.
- FIGS. 1A-1F illustrate a floating platform 100 and associated elements for a drilling rig according to one embodiment.
- FIG. 1A illustrates a top view of the floating platform 100 comprises base 10 on which workers can stand and perform various work operations.
- the base 10 has a hole 14 formed in the center through which, for example, a riser may pass.
- the base 10 is split into a first half 10A and a second half 10B, which are coupled together by one or more locks 11, such as a manual locking device.
- the locks 11 may comprise any type of mechanical locking device to secure the two halves 10A, 10B together.
- the two halves 10A, 10B are split along a V-shaped edge 12 (as additionally illustrated in FIG. IF, which illustrates a top view of a portion of the floating platform 100) to assist with alignment of the two halves 10A, 10B during installation.
- the base 10 and/or the hole 14 may comprise other shapes.
- the barrier 20 completely surrounds any worker working on the floating platform 100.
- a gate or other opening in the barrier 20 may be provided to allow access onto the floating platform 100.
- one or more centralizers 30 are secured to the two halves 10A, 10B. The centralizers 30 allow for centering of the floating platform 100 about a riser string and allow the floating platform 100 to move with the riser string as it is deployed and retrieved, as further described below. As additionally illustrated in FIG.
- each centralizer 30 comprises an upper set of rollers 31, a lower set of rollers 32, each having a piston/cylinder assembly 33 to move the rollers 31, 32 radially inward and outward for engagement and disengagement with the riser string.
- the contour of the rollers 31, 32 may match the outer diameter of the riser string such that the rollers 31, 32 roll along the outer surface of the riser string.
- the rollers 31, 32 may also be shrouded or include protective type of covering to prevent the rollers 31, 32 from forming any "pinch points" when engaged with the riser string.
- FIG. 1C which illustrates another side view of the floating platform 100
- one or more capture systems 40 are secured to one or more support members 45 that are coupled to the two halves 10A, 10B.
- the support member 45 may be or may include a handling pin that is used to provide an interface point for a manipulator arm (described below) to grab and move the two halves 10A, 10B during installation.
- Each capture system 40 is disposed to keep one of two halves 10A, 10B close to the riser string while the other one of the two halves 10A, 10B is being installed.
- each capture system 40 comprises a housing 41 and a spring loaded locking member 42 (e.g., a carabiner type device), which allows a one-way entry of and connection to an installation pin 43 but requires manual intervention to release the installation pin 43 from the housing 41.
- the installation pin 43 is pre-installed on an auxiliary line 44 (e.g., a choke and kill line) by a bracket 46.
- the auxiliary line 44 is coupled to the outer surface of the riser string 5.
- the installation pin 43 and the capture system 40 assist with connecting the two halves 10A, 10B of the floating platform 100 to the riser string 5.
- the bottom of the two halves 10A, 10B of the floating platform 100 may be fitted with one or more low friction pads 15, as illustrated in FIGS. 1B and 1E (which illustrates a bottom view of the floating platform 100).
- the pads 15 allow the floating platform 100 to glide or float with the motion of the riser string 5 when positioned on a fixed platform 200 as further described below.
- the pads 15 may be made of Teflon-graphite material and arranged in modular wedge shaped segments. In addition to the friction pads 15, or alternatively, embodiments may use other bearing or roller type systems that minimize friction between the floating platform 100 and the fixed platform 200.
- FIGS. 2A-2B and 3A-3C illustrate a fixed platform 200 for supporting the floating platform 100 according to one embodiment.
- the fixed platform 200 is coupled to the drilling rig 1.
- FIGS. 2A and 2B illustrate a top view and a side view, respectively, of the fixed platform 200 in a retracted (stowed) position below a deck 2 surrounding an open area of the drilling rig 1 known as a moon pool.
- FIGS. 3A-3C illustrate a top view and a side view, respectively, of the fixed platform 200 in an extended position over the moon pool (e.g., in a moon pool area) and surrounding the riser string 5.
- the riser string 5 is lowered and raised through the moon pool using conventional tubular handling equipment.
- the fixed platform 200 comprises a base 210 on which workers can stand and perform various work operations.
- the base 210 is formed by a first half 210A and a second half 210B.
- the first and second halves 210A, 210B are movable into and out of engagement with each other by a piston/cylinder assembly 233.
- the fixed platform 200 provides a stable deck for supporting the floating platform 100.
- the base 210 may comprise other shapes.
- the fixed platform 200 may comprise removable fixed panels that are manually lowered and affixed into position when needed.
- the two halves 210A, 210B of the fixed platform 200 or the entire fixed platform 200 may fold vertically against the deck 2 and articulate into a fixed, hang off, working position.
- One or more manipulator arms 250 may be coupled to the deck 2 (or to another area on the drilling rig 1) to assist with installing the floating platform 100 onto the fixed platform 200. Although manipulator arms 250 are illustrated, other conventional rig handling equipment and devices may be used to position the floating platform 100 onto the fixed platform 200. A transporter cart 255 that is movable along the deck 2 may also be used to assist with moving the floating platform 100 next to the fixed platform 200.
- the riser string 5 and the auxiliary line 44 coupled to the outer surface of the riser string 5 are positioned between the first and second halves 210A, 210B of the fixed platform 200 through the moon pool.
- FIGS. 3A-3C a top view of the fixed platform 200 in an extended position, a side view of the fixed platform 200 in an extended position, and a second top view of the fixed platform 200 in an extended position, respectively
- the two halves 210A, 210B of the fixed platform 200 are moved into the extended position by the piston/cylinder assemblies 233 and brought together to form the complete base 210.
- At the center of the base 210 is a hole 214 through which the riser string 5 passes.
- the hole 214 is sized to allow the riser string 5 to have some lateral movement as illustrated in FIG. 3C .
- the hole 214 may be sized to allow the riser string 5 to have up to about 5 degrees of angular motion relative to the point where the riser string 5 hangs off from the drilling rig 1. Also illustrated is the installation pin 43 coupled to the umbilical line 44 positioned alongside the riser string 5 to assist with installing the floating platform 100 as further described below.
- the two halves 210A, 210B may be coupled together by one or more locks 211, such as remotely controlled hydraulic locks.
- the locks 211 may comprise any type of locking device to secure the two halves 210A, 210B together.
- One or more barriers 220 such as handrails, may be coupled to the fixed platform 200.
- the barriers 220 may be movable between a substantially horizontal position (such that they are recessed into the base 210 of the fixed platform 200) when not in use and a substantially vertical position (to provide protection to workers on the fixed platform 200) when in use.
- FIGS. 4A-4E illustrate an operational sequence of installing the floating platform 100 of FIGS. 1A-1F onto the fixed platform 200 of FIGS. 2A-2B and 3A-3C , and positioning the floating platform 100 into engagement with the riser string 5.
- FIG. 4A a top view of the two halves 10A, 10B of floating platform 100 in a storage position
- the fixed platform 200 is in the extended position with the riser string 5 positioned within the hole 214 of the base 210 of the fixed platform 200.
- the two halves 10A, 10B of the floating platform 100 are loaded onto the transporter cart 255.
- the transporter cart 255 moves the floating platform 100 next to the fixed platform 200 for handling by the manipulator arms 250.
- the manipulator arms 250 may pick up or push the first and second halves 10A, 10B by the support member 45.
- the floating platform 100 is moved from the transporter cart 255 to the fixed platform 200.
- the manipulator arms 250 guide each of the two halves 10A, 10B into a position where the installation pin 43 engages the capture system 40 to retain each half 10A, 10B to the riser string 5 (also illustrated in FIG. 1D ).
- This allows the floating platform 100 to float and move with the motion of the riser string 5 while staying retained to the riser string 5.
- the other half 10A, 10B may be installed in a same manner.
- the V-shaped edges 12 of each half 10A, 10B assist with aligning and centralizing the two halves 10A, 10B together.
- the two halves 10A, 10B are each secured to the riser string 5, which is positioned through the hole 14 of the floating platform 100.
- the locks 11 may be actuated remotely to secure the two halves 10A, 10B together.
- the manipulator arms 250 can be moved out of the way, and the gates 220 of the fixed platform 200 can be moved from the substantially horizontal position (flush with the base 210 of the fixed platform 200) to the substantially vertical position.
- the gates 220 assist workers to safely move to the floating platform 100.
- the installation pins 43 can also be removed from engagement with the capture systems 30 of each half 10A, 10B of the floating platform 100.
- the pads 15 of the floating platform 100 contact the base 210 of the fixed platform 200 to minimize friction and prevent metal to metal wear between the floating platform 100 and the fixed platform 200.
- the pads 15 may also be replaceable to account for wear over time.
- the centralizers 30 are actuated into engagement with the riser string 5. Specifically, the upper and lower rollers 31, 32 are moved radially into contact with the outer surface of the riser string 5. The upper and lower rollers 31, 32 roll along the outer surface of the riser string 5 to allow the riser string 5 to be raised and lowered relative to the floating platform 100.
- one or more guide members may be mounted to the riser string 5 to provide a constant path along which the rollers 31, 32 can engage. Lateral (horizontal) movement of the riser string 5, however, is transferred to the floating platform 100 by the centralizers 30. The floating platform 100 floats on top of and moves relative to the fixed platform 200 with lateral movement of the riser string 5.
- FIGS. 5A-5C illustrate an operational sequence of moving a riser string flange 6 of the riser string 5 through the floating platform 100 and the fixed platform 200.
- the riser string 5 is comprised of multiple tubular members joined together. The ends of the tubular members may be connected together by a bolted, flanged connection. Since each riser string flange 6 has an outer diameter that is greater than the outer diameter of the riser string 5, the centralizers 30 have to be adjusted to allow each riser string flange 6 to pass through the floating platform 100.
- the riser string 5 is lowered through the floating platform 100 and the fixed platform 200. All of the centralizers 30 are engaged with the riser string 5. As the riser string flange 6 approaches the floating platform 100, the centralizers 30 need to be sequenced to pass the riser string flange 6 through the floating platform 100. Otherwise, the riser string flange 6 may contact the upper rollers 31 and force the floating platform 100 and the fixed platform 200 in a downward direction, potentially damaging the platforms 100, 200 and the drilling rig.
- the upper rollers 31 of the centralizers 30 are retracted to allow the riser string flange 6 to be lowered through.
- the riser string flange 6 is lowered into a position between the upper rollers 31 and the lower rollers 32.
- the lower rollers 32 are still in engagement with the riser string 5.
- the upper rollers 31 may be extended back into engagement with the riser string 5.
- the upper rollers 31 are extended into engagement with the riser string 5.
- the lower rollers 32 are retracted to allow the riser string flange 6 to continued to pass through the floating platform 100.
- the centralizers 30 may comprise shrouded spring-loaded rollers on rocker arms that automatically extend and retract as the riser string flanges 6 pass through the floating platform 100.
- the centralizers 30 are extended and retracted in this manner to allow the riser string flanges 6 or any other enlarged outer diameter areas on the riser string 5 to pass through the floating platform 100.
- the floating platform 100 and the fixed platform 200 allow rig workers to attach umbilical lines to the outer surface of the riser string 5 in a protected area that is fully enclosed by the gate 20. This protected area avoids the need for having to deploy a rescue boat when work is being performed in the moon pool area.
- work being performed in the moon pool area may be accomplished without exposing workers directly to the sea below, as the fixed platform 200 and floating platform 100 shall be underfoot of workers in the moon pool area. In this manner, the work performed over the moon pool area is not considered to be "work over the side.”
- FIG. 6A illustrates a side view of an offshore platform, such as a semi-submersible platform 310.
- a semi-submersible platform 310 e.g., offshore semi-submersible drilling rig
- other offshore platforms such as a drillship, a floating production system, or the like may be substituted for the semi-submersible platform 310 such that the techniques and systems described below are intended to cover at least the additional above-noted offshore platforms.
- the semi-submersible platform 310 may include a riser access platform 312.
- the riser access platform 312 may include a platform housing 314 (e.g., disposed below a moon pool of the semi-submersible platform 310) that includes at least one bottom portion 316 extending, for example, in a parallel direction with the deck 317 different deck 317 this one is bottom and at least one side portion 318 extending, for example, in a perpendicular direction to the deck 317.
- a space 320 e.g., a moon pool area inclusive of a moon pool for the riser 5 to pass through
- the side portion 318 may fully surround the at least one bottom portion 316 so as to shield the internal space of the riser access platform 312 from natural elements (e.g., water, wind, etc.).
- the side portion 318 may surround the perimeter of each bottom portion 316 up to space 320.
- a vertical aperture may exist between each bottom portion 316 and the deck 317 along each edge of the space 320.
- This aperture may be covered, for example, by a watertight retractable covering (not illustrated) that may extend from each bottom portion 316 towards the deck 317 and may have a height approximately equal to side portion 318.
- This retractable covering may be a moveable covering that can be moved from a primarily vertical extended position (shielding the internal space of the riser access platform 312 from natural elements) into a primarily horizontal retracted position (along the horizontal length of the deck 317) in a manner similar to a home garage door to allow for the techniques described below to be performed.
- the retractable covering may be disposed along each edge of space 320 and may form a barrier (along with bottom portion 316 and side region 318) for internal space of the riser access platform 312.
- two separate portions may be combined to form the platform housing 314.
- the side portion 318 may extend partially along the edge of space 320 such that the retractable covering does not fully extend along the edge of space 320.
- the riser access platform 312 houses a moveable platform 322 and a floating platform 324 that is movably coupled to the moveable platform 322 (e.g., the floating platform 324 may move in one or more directions with respect to the movable platform 322 while being coupled to the movable platform 322).
- the moveable platform 322 and the floating platform 324 may operate in conjunction to allow work to be performed on riser 5 without the work constituting "work over the side.”
- each of the moveable platform 322 and the floating platform 324 are illustrated as being disposed beneath the deck 317.
- each of the moveable platform 322 and the floating platform 324 may instead be disposed on the deck 317, on or below the drill floor 326, or in another area of the semi-submersible platform 310.
- the moveable platform 322 and the floating platform 324 when utilized in a drillship, may be located in the hull of the drillship.
- FIG. 6B illustrates a top view of the riser access platform 312.
- the riser access platform includes the bottom portion 316, the moveable platform 322, and the floating platform 324.
- the moveable platform 322 and the floating platform 324 are in their extended positions.
- a control panel 328 may be provided to control, for example, the movement of each of the moveable platform 322, and the floating platform 324 into their extended and retracted positions. It should be noted that the control panel 328 may operate in conjunction with software systems implemented as computer executable instructions stored in a non-transitory machine readable medium such as memory, a hard disk drive, or other short term and/or long term storage in the control panel 328.
- the techniques to operate the control panel 328 may be performed using code or instructions stored in a non-transitory machine-readable medium (e.g., the memory and/or storage) and may be executed, for example, by the one or more processors or a controller of control panel 328.
- the controller of the control panel 328 may be read as an application specific integrated circuit (ASIC), one or more processors, or another processing device that interacts with memory one or more tangible, non-transitory, machine-readable media that collectively stores instructions executable by the controller the method and actions described herein.
- ASIC application specific integrated circuit
- machine-readable media can comprise RAM, ROM, EPROM, EEPROM, CD-ROM or other optical disk storage, magnetic disk storage or other magnetic storage devices, or any other medium which can be used to carry or store desired program code in the form of machine-executable instructions or data structures and which can be accessed by the processor or by any general purpose or special purpose computer or other machine with a processor.
- control of the controller via the control panel 328 may be performed by a user utilizing one or more user inputs (keys, buttons, joystick, a graphical user interface, etc.).
- the riser access platform 312 may include platform extend and retract platform tracks 330 that guide the portions of the moveable platform 322 along the bottom portion 316.
- the riser access platform 312 may also include one or more linear actuators 332 that provide motion in a straight line to allow for the extension and retraction of the portions of the moveable platform 322 along extend and retract platform tracks 330.
- each linear actuator 332 may include a hydraulic cylinder. In some embodiments, the operation of each linear actuator 332 may be controlled by the control panel 328.
- the moveable platform 322 may include two separate portions each moved by one or more linear actuators 332 concurrently such that movement of each portion of the moveable platform 322 is common (e.g., performed at a common speed).
- the one or more linear actuators 332 may operate to extend and retract portions of the moveable platform 322 for storage and for operation.
- the moveable platform 322 may include secondary linear actuators 334.
- the secondary linear actuators 334 may facilitate retraction and extension of separate portions of the floating platform 324 to allow for connection and disconnection of the portions of the floating platform 324 along floating platform extend and retract tracks 336 that guide the separate portions of the floating platform 324 along the moveable platform 322.
- each linear actuator 334 may include a hydraulic cylinder and the operation of each linear actuator 334 may be controlled by the control panel 328.
- the floating platform 324 may include two separate portions each moved by one or more linear actuators 334 concurrently such that movement of each portion of the floating platform 324 is common (e.g., performed at a common speed). In this manner, the one or more actuators 334 may operate to extend and retract portions of the floating platform 324 for operation and for storage.
- the one or more actuators 334 may be positioned on one or more secondary actuator tracks 338 that allow for the movement of the actuators 334 to maintain a relative position with the floating platform 324 (e.g., so that the actuators 334 remain generally disposed about the riser 5).
- the actuators 334 may also be utilized to control motion of the floating platform 324.
- the control panel 328 may cause the actuators 334 to provide a resistance force against the floating platform 324 when the floating platform moves in a linear direction towards a respective actuator 334.
- the amount of resistance force is inversely proportional to the distance from the floating platform 324 to the respective actuator 334 (e.g.
- one or more sensors may be utilized to measure and/or detect the movement of the floating platform 324 and transmit an indication of the movement to the control panel 328, which may generate a signal to control a respective actuator 334 to provide a predetermined resistance force, as described above.
- the one or more actuators 334 may be passively controlled and set up to provide a predetermined resistance force in response to the movement of the floating platform 324.
- platform 324 may include one or more floating platform linear actuators 340.
- the floating platform linear actuators 340 may be positioned on the floating platform extend and retract tracks 336 to allow for the movement of the actuators 340 to maintain a relative position with the floating platform 324 (e.g., so that the actuators 340 remain generally disposed about the riser 5).
- the actuators 340 may also be utilized to control motion of the floating platform 324.
- the control panel 328 may cause the actuators 340 to provide a resistance force against the floating platform 324 when the floating platform moves in a linear direction towards or away from the actuators 340.
- the amount of resistance force may be related to the distance from the floating platform 324 to the actuators 340 (e.g., as the distance between the floating platform 324 and the respective actuator 340 moves towards a predetermined minimum or a predetermined maximum distance value, the pressure applied to the floating platform 324 to counter the movement of the floating platform 324 by the one or more actuators 340 increases).
- one or more sensors may be utilized to measure and/or detect the movement of the floating platform 324 and transmit an indication of the movement to the control panel 328, which may generate a signal to control the one or more actuators 340 to provide a predetermined resistance force, as described above.
- the one or more actuators 340 may be passively controlled and set up to provide a predetermined resistance force in response to the movement of the floating platform 324 about aperture 342 of the moveable platform 322 in which riser 5 moves (e.g., in response to nature or other influences).
- barriers 344 may be utilized, for example, on the moveable platform 322, the floating platform 324, and/or the bottom portion 316.
- One or more gates or other openings in the barriers 344 may be provided to allow access of a worker onto and off of the moveable platform 322 and/or the floating platform 324. Additionally, as will be described in greater detail below with respect to FIG.
- the riser access platform 312 may also include an interlock system 346 that is utilized to couple the portions of the floating platform 324 together, a two dimensional (2D) roller assembly 348 that facilitates movement of the floating platform 324 when riser 5 moves in aperture 342, and a roller guide assembly 350 disposed in an aperture of the floating platform 324 that contacts riser 5.
- an interlock system 346 that is utilized to couple the portions of the floating platform 324 together
- a two dimensional (2D) roller assembly 348 that facilitates movement of the floating platform 324 when riser 5 moves in aperture 342
- a roller guide assembly 350 disposed in an aperture of the floating platform 324 that contacts riser 5.
- FIGS. 6C-6F illustrate top views of the moveable platform 322 and the floating platform 324 during movement from a storage position to an extended (operational position).
- FIG. 6C illustrates a first portion of the moveable platform 322A and a second portion of the moveable platform 322B in a storage position (e.g., non-extended from bottom portion 316).
- FIG. 6C illustrates a first portion of the floating platform 324A and a second portion of the moveable platform 324B in a storage position (e.g., non-extended from bottom portion 316).
- one or more locking mechanisms such as any type of mechanical locking device may be utilized to secure each of the first portion of the moveable platform 322A and a second portion of the moveable platform 322B and/or the first portion of the floating platform 324A and the second portion of the moveable platform 324B in respective storage positions.
- the one or more linear actuators 332 e.g., as controlled by the control panel 328
- space 320 e.g., across the moon pool area
- the one or more linear actuators 332 complete movement of the first portion of the moveable platform 322A and a second portion of the moveable platform 322B to form moveable platform 322.
- the one or more secondary linear actuators 334 e.g., as controlled by the control panel 328
- the one or more secondary linear actuators 334 may cause the first portion of the floating platform 324A and the second portion of the floating platform 324B to extend over the aperture 342 of the moveable platform 322.
- the one or more secondary linear actuators 334 complete movement of the first portion of the floating platform 324A and a second portion of the moveable platform 324B to form floating platform 324.
- the floating platform 324 may move about the moveable platform 322 in response to movements by the riser 5 in aperture 342 of the moveable platform 322.
- one or more workers may be able to stand on the floating platform 324 to perform work on the riser 5 without the work being considered over the side work (e.g., due at least to the floating platform 324 being underfoot of the one or more workers and/or due to the enclosure of the one or more workers by barriers 344).
- FIG. 6G illustrates an isometric view of the riser access platform 312.
- the riser access platform 312 includes an interlock system 346 (e.g., any type of locking device), which is illustrated in greater detail in FIG. 6G .
- the interlock system 346 includes a locking pin 353 that is utilized to couple the portions 324A and 324B of the floating platform 324 together.
- the locking pin 353 may engage with a locking block 354 to couple the portions 324A and 324B of the floating platform 324 together.
- the locking pin 353 may be manually or automatically inserted through the floating platform 324 and more than one interlock system 346 may be utilized in conjunction with the riser access platform 312.
- the locking pin 353 may couple both portions 324A and 324B of the floating platform 324 together as well as portions 322A and 322B of the movable platform 322 together.
- FIG. 6G illustrates the 2D roller assembly 348 that facilitates movement of the floating platform 324 in conjunction with the movement of the riser 5 in aperture 342.
- the 2D roller assembly 348 includes a roller track 356 that allows for movement of the floating platform 324 in a direction generally parallel to the direction of the secondary actuator tracks 338 and generally perpendicular to the direction of the floating platform extend and retract tracks 336.
- the 2D roller assembly also includes a 2D motion roller assembly 358 that allows for respective motion of the floating platform 324 in two directions (e.g., in a direction generally parallel to the direction of the secondary actuator tracks 338 and in a direction generally parallel to the direction of the floating platform extend and retract tracks 336).
- the 2D motion roller assembly 358 may operate to allow movement of the floating platform 324 in a first direction (e.g., in a direction generally parallel to the direction of the secondary actuator tracks 338) while restricting motion in a second direction (e.g., in a direction generally parallel to the direction of the floating platform extend and retract tracks 336).
- the 2D motion roller assembly 358 may also operate to allow movement of the floating platform 324 in the second direction (e.g., in a direction generally parallel to the direction of the floating platform extend and retract tracks 336) while restricting motion in the first direction (e.g., in a direction generally parallel to the direction of the secondary actuator tracks 338).
- the motion roller assembly 358 may also operate to allow movement of the floating platform 324 in both the first direction (e.g., in a direction generally parallel to the direction of the secondary actuator tracks 338) and the second direction (e.g., in a direction generally parallel to the direction of the floating platform extend and retract tracks 336).
- the motion of the floating platform 324 may be caused by movement of the riser 5 in the aperture 342 to allow workers to work on riser 5 while engaged with the floating platform 324.
- FIG. 6G further illustrates the roller guide assembly 350 disposed in an aperture 352 of the floating platform 324.
- the aperture 352 may be surrounded by a foot barrier (not illustrated).
- the foot barrier may be a guard or rail that extends vertically from the surface of the floating platform 324 about the aperture 352.
- the roller guide assembly 350 may operate to engage the floating platform 324 with the riser 5 while still allowing for vertical movement of the riser with respect to the floating platform.
- FIGS. 7A-7C Detailed versions of the roller guide assembly 350 are illustrated in conjunction with FIGS. 7A-7C .
- FIG. 7A illustrates an isometric view of the roller guide assembly 350.
- the roller guide assembly 350 may include one or more riser centralizing rollers 360 that interact with a respective riser fin 362 of the riser 5.
- each of the riser centralizing rollers 360 allows for the riser 5 to move vertically and positions the riser 5 centrally in aperture 352.
- each of the riser centralizing rollers 360 is moveably coupled to a respective riser fin 362 of the riser 5 such that each of the riser centralizing rollers 360 rolls when the riser 5 moves in a vertical direction.
- FIG. 7B illustrates a top view of the roller guide assembly 350 and further details the interaction of the riser centralizing rollers 360 with the riser fins 362.
- the riser centralizing rollers 360 may be disposed about the aperture 352 and may each engage a respective riser fin 362. Also illustrated in FIG. 7B , one or more umbilical lines 364 (e.g., one or more chemical, hydraulic, and/or electrical conductors for power and control systems), one or more choke/kill lines 366 (e.g., conduits arranged along the riser 5 for circulation of fluids into and out of a well bore to control well pressure), and a riser slick joint 368. Additionally illustrated in FIG. 7B is a sectional cutout "A" of the riser 5 and the roller guide assembly 350, as further illustrated in FIG. 7C .
- umbilical lines 364 e.g., one or more chemical, hydraulic, and/or electrical conductors for power and control systems
- choke/kill lines 366 e.g., conduits arranged along the riser 5 for circulation of fluids into and out of a well bore to control well pressure
- a riser slick joint 368 Additionally illustrated in
- FIG. 7C illustrates the sectional cutout "A" of FIG. 7B .
- the riser centralizing rollers 360 may include a roller cushion assembly 370 that allows the riser centralizing rollers 360 to maintain a movable engagement with the riser fins 362 of the riser 5.
- the roller cushion assembly 370 may allow the riser centralizing rollers 360 to move in a direction away from the riser 5 while still maintaining sufficient pressure on the riser 5 to maintain its horizontal positioning within the aperture 352.
- FIGS. 8A-8C illustrate various versions of the riser 5.
- riser 5 has no riser fins 362.
- riser 5 may include a main portion 372.
- the riser fins 362 may be disposed about the main portion 372.
- the riser fins 362 may be disposed equidistant (approximately 90 degrees) from one another about the main portion 372.
- the riser fins 362 may extend a length 374 less than an entire length 376 of a riser 5.
- the riser fins 362 may taper at the ends of the length 374 of the riser 5 such that the riser fins 362 terminate at a joint 378 of the riser 5. In this manner, the riser fins 362 may extend a constant distance 380 from the main portion 372 of the riser 5 so that there is a consistent surface at distance 380 around the main portion 372 of the riser 5.
- FIG. 8B illustrates a second embodiment of the riser 5.
- the riser 5 includes six riser fins 362.
- Each of the six riser fins 362 may be disposed about the main portion 372.
- each riser fin 362 may be disposed equidistant (approximately 60 degrees) from one another about the main portion 372.
- FIG. 9 illustrates a second embodiment of the floating platform 324.
- each portion 324A and 324B includes two cutouts that combine to form apertures 382.
- Apertures 382 may be similar to aperture 352 discussed above, however, by having two apertures 382, multiple risers 5 may pass through the floating platform 324. It should further be noted that while two apertures 382 are illustrated, more than two apertures are contemplated. Furthermore, it should be noted that each aperture 382 may allow a riser to pass through a single aperture 342 of the moveable platform 322 or through distinct apertures 342 that each correspond to a respective aperture 382.
- Present techniques and systems allow for use of a floating platform and/or a floating platform in conjunction with a moveable platform that span a moon pool area of an offshore platform.
- work on a riser that typically would be characterized as "work over the side” may be re-characterized as not constituting "work over the side.” Accordingly, riser work, which might otherwise be delayed due to events (harsh weather conditions, etc.), may be performed. This allows for less downtime of the offshore platform and, therefore, increases the efficiency of the offshore platform.
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Description
- This application is a Non-Provisional Application claiming priority to
U.S. Provisional Patent Application No. 61/968,515 - This section is intended to introduce the reader to various aspects of art that may be related to various aspects of the present disclosure, which are described and/or claimed below. This discussion is believed to be helpful in providing the reader with background information to facilitate a better understanding of the various aspects of the present disclosure. Accordingly, it should be understood that these statements are to be read in this light, and not as admissions of prior art.
- Offshore drilling rigs are often located in harsh sea environments. Often times, workers on a drilling rig are required to perform "work over the side," which is work that is performed in an open area of the drilling rig platform. One example of "work over the side" is when workers are working in a moon pool area of a drilling rig platform and attaching umbilical lines to a riser string that is being lowered through the moon pool area. Whenever performing "work over the side," safety regulations may require a rescue boat to be deployed in the sea during the time in which the work is being performed. However, sea conditions may become so harsh that the rescue boat cannot be deployed, thus preventing the "work over the side" from being performed. This results in loss of drilling rig time and added expenses. Accordingly, it would be desirable to provide systems and methods to address "work over the side" issues.
- An offshore working platform is for instance known from
US-A-4,068,487 disclosing a complicated platform having several layers of rails. -
-
FIGS. 1A-1F illustrate a floating platform, in accordance with an embodiment; -
FIGS. 2A-3C illustrate a fixed platform for use in conjunction with the floating platform ofFIGS. 1A-1F , in accordance with an embodiment; -
FIGS. 4A-4E illustrate an operational sequence of installing the floating platform ofFIGS. 1A-1F onto the fixed platform ofFIGS. 2A-3C , and positioning the floating platform into engagement with a riser string, in accordance with an embodiment; -
FIGS. 5A-5C illustrate an operational sequence of moving a riser string flange through the floating and fixed platforms ofFIGS. 1A-1F andFIGS. 2A-3C , in accordance with an embodiment; -
FIGS. 6A-6G illustrate a riser access platform, in accordance with an embodiment; -
FIGS. 7A-7C illustrate aroller guide assembly 350 ofFIG. 6G , in accordance with an embodiment; -
FIGS. 8A-8B illustrate theriser 5 ofFIG. 6A , in accordance with an embodiment; and -
FIG. 9 illustrates a second embodiment of the floating platform ofFIG. 6A , in accordance with an embodiment. - Embodiments according to the invention are set out in the independent claims with further alternative embodiments as set out in the dependent claims.
- One or more specific embodiments will be described below. In an effort to provide a concise description of these embodiments, all features of an actual implementation may not be described in the specification. It should be appreciated that in the development of any such actual implementation, as in any engineering or design project, numerous implementation-specific decisions must be made to achieve the developers' specific goals, such as compliance with system-related and business-related constraints, which may vary from one implementation to another. Moreover, it should be appreciated that such a development effort might be complex and time consuming, but would nevertheless be a routine undertaking of design, fabrication, and manufacture for those of ordinary skill having the benefit of this disclosure.
- When introducing elements of various embodiments, the articles "a," "an," "the," and "said" are intended to include one or more of the elements. The terms "comprising," "including," and "having" are intended to be inclusive and mean that there may be additional elements other than the listed elements.
-
FIGS. 1A-1F illustrate afloating platform 100 and associated elements for a drilling rig according to one embodiment.FIG. 1A illustrates a top view of thefloating platform 100 comprisesbase 10 on which workers can stand and perform various work operations. Thebase 10 has ahole 14 formed in the center through which, for example, a riser may pass. Thebase 10 is split into afirst half 10A and asecond half 10B, which are coupled together by one ormore locks 11, such as a manual locking device. Thelocks 11 may comprise any type of mechanical locking device to secure the twohalves halves halves base 10 and/or thehole 14 may comprise other shapes. - A
barrier 20, such as a handrail, is illustrated inFIG. 1B (a side view of the floating platform 100) and surrounds thebase 10 so that work performed on thefloating platform 100 is not considered "work over the side." Thebarrier 20 completely surrounds any worker working on thefloating platform 100. In one embodiment, a gate or other opening in thebarrier 20 may be provided to allow access onto thefloating platform 100. Additionally, one ormore centralizers 30 are secured to the twohalves centralizers 30 allow for centering of thefloating platform 100 about a riser string and allow thefloating platform 100 to move with the riser string as it is deployed and retrieved, as further described below. As additionally illustrated inFIG. 1B , eachcentralizer 30 comprises an upper set ofrollers 31, a lower set ofrollers 32, each having a piston/cylinder assembly 33 to move therollers rollers rollers rollers rollers - Turning to
FIG. 1C , which illustrates another side view of the floatingplatform 100, one ormore capture systems 40 are secured to one ormore support members 45 that are coupled to the twohalves support member 45 may be or may include a handling pin that is used to provide an interface point for a manipulator arm (described below) to grab and move the twohalves capture system 40 is disposed to keep one of twohalves halves - Referring to
FIG. 1D , which illustrates a top view of thecapture system 40, eachcapture system 40 comprises ahousing 41 and a spring loaded locking member 42 (e.g., a carabiner type device), which allows a one-way entry of and connection to aninstallation pin 43 but requires manual intervention to release theinstallation pin 43 from thehousing 41. Theinstallation pin 43 is pre-installed on an auxiliary line 44 (e.g., a choke and kill line) by abracket 46. Theauxiliary line 44 is coupled to the outer surface of theriser string 5. Theinstallation pin 43 and thecapture system 40 assist with connecting the twohalves platform 100 to theriser string 5. - The bottom of the two
halves platform 100 may be fitted with one or morelow friction pads 15, as illustrated inFIGS. 1B and1E (which illustrates a bottom view of the floating platform 100). Thepads 15 allow the floatingplatform 100 to glide or float with the motion of theriser string 5 when positioned on a fixedplatform 200 as further described below. Thepads 15 may be made of Teflon-graphite material and arranged in modular wedge shaped segments. In addition to thefriction pads 15, or alternatively, embodiments may use other bearing or roller type systems that minimize friction between the floatingplatform 100 and the fixedplatform 200. -
FIGS. 2A-2B and3A-3C illustrate a fixedplatform 200 for supporting the floatingplatform 100 according to one embodiment. The fixedplatform 200 is coupled to thedrilling rig 1.FIGS. 2A and2B illustrate a top view and a side view, respectively, of the fixedplatform 200 in a retracted (stowed) position below adeck 2 surrounding an open area of thedrilling rig 1 known as a moon pool.FIGS. 3A-3C illustrate a top view and a side view, respectively, of the fixedplatform 200 in an extended position over the moon pool (e.g., in a moon pool area) and surrounding theriser string 5. Theriser string 5 is lowered and raised through the moon pool using conventional tubular handling equipment. - Work performed over the moon pool area, outside of the typical barriers or handrails along the edge of
deck 2, is considered "work over the side" because the open sea is below. This work is typically performed from temporary platforms whilst wearing fall-arrest equipment or from a work access basket whilst wearing fall arrest equipment. Embodiments described herein are directed to allowing workers to work in the moon pool area in a manner that the work performed is not considered "work over the side." Specifically, by using the floatingplatform 100 and the fixedplatform 200 as described herein, the workers are fully secured within an enclosed work environment which includes barriers or handrails (which may be higher than standard height) that completely surround the workers at all times. - Referring to
FIGS. 2A and2B (a top view of the fixedplatform 200 in a storage position and a side view of the fixedplatform 200 in a storage position, respectively) the fixedplatform 200 comprises a base 210 on which workers can stand and perform various work operations. Thebase 210 is formed by afirst half 210A and asecond half 210B. The first andsecond halves cylinder assembly 233. The fixedplatform 200 provides a stable deck for supporting the floatingplatform 100. Although illustrated as having a rectangular shape, thebase 210 may comprise other shapes. Although the fixedplatform 200 is described herein as being extended and retracted using the piston/cylinder assembly 233, according to another embodiment, the fixedplatform 200 may comprise removable fixed panels that are manually lowered and affixed into position when needed. According to another embodiment, the twohalves platform 200 or the entirefixed platform 200 may fold vertically against thedeck 2 and articulate into a fixed, hang off, working position. - One or
more manipulator arms 250 may be coupled to the deck 2 (or to another area on the drilling rig 1) to assist with installing the floatingplatform 100 onto the fixedplatform 200. Althoughmanipulator arms 250 are illustrated, other conventional rig handling equipment and devices may be used to position the floatingplatform 100 onto the fixedplatform 200. Atransporter cart 255 that is movable along thedeck 2 may also be used to assist with moving the floatingplatform 100 next to the fixedplatform 200. Theriser string 5 and theauxiliary line 44 coupled to the outer surface of theriser string 5 are positioned between the first andsecond halves platform 200 through the moon pool. - Referring to
FIGS. 3A-3C (a top view of the fixedplatform 200 in an extended position, a side view of the fixedplatform 200 in an extended position, and a second top view of the fixedplatform 200 in an extended position, respectively), the twohalves platform 200 are moved into the extended position by the piston/cylinder assemblies 233 and brought together to form thecomplete base 210. At the center of thebase 210 is ahole 214 through which theriser string 5 passes. Thehole 214 is sized to allow theriser string 5 to have some lateral movement as illustrated inFIG. 3C . In one embodiment, thehole 214 may be sized to allow theriser string 5 to have up to about 5 degrees of angular motion relative to the point where theriser string 5 hangs off from thedrilling rig 1. Also illustrated is theinstallation pin 43 coupled to theumbilical line 44 positioned alongside theriser string 5 to assist with installing the floatingplatform 100 as further described below. - Referring to
FIG. 3C , the twohalves more locks 211, such as remotely controlled hydraulic locks. Thelocks 211 may comprise any type of locking device to secure the twohalves more barriers 220, such as handrails, may be coupled to the fixedplatform 200. Thebarriers 220 may be movable between a substantially horizontal position (such that they are recessed into thebase 210 of the fixed platform 200) when not in use and a substantially vertical position (to provide protection to workers on the fixed platform 200) when in use. -
FIGS. 4A-4E illustrate an operational sequence of installing the floatingplatform 100 ofFIGS. 1A-1F onto the fixedplatform 200 ofFIGS. 2A-2B and3A-3C , and positioning the floatingplatform 100 into engagement with theriser string 5. Referring toFIG. 4A (a top view of the twohalves platform 100 in a storage position), the fixedplatform 200 is in the extended position with theriser string 5 positioned within thehole 214 of thebase 210 of the fixedplatform 200. The twohalves platform 100 are loaded onto thetransporter cart 255. - Referring to
FIG. 4B , thetransporter cart 255 moves the floatingplatform 100 next to the fixedplatform 200 for handling by themanipulator arms 250. Themanipulator arms 250 may pick up or push the first andsecond halves support member 45. The floatingplatform 100 is moved from thetransporter cart 255 to the fixedplatform 200. - Referring to
FIG. 4C , themanipulator arms 250 guide each of the twohalves installation pin 43 engages thecapture system 40 to retain each half 10A, 10B to the riser string 5 (also illustrated inFIG. 1D ). This allows the floatingplatform 100 to float and move with the motion of theriser string 5 while staying retained to theriser string 5. When onehalf other half edges 12 of each half 10A, 10B assist with aligning and centralizing the twohalves - Referring to
FIG. 4D , the twohalves riser string 5, which is positioned through thehole 14 of the floatingplatform 100. Thelocks 11 may be actuated remotely to secure the twohalves manipulator arms 250 can be moved out of the way, and thegates 220 of the fixedplatform 200 can be moved from the substantially horizontal position (flush with thebase 210 of the fixed platform 200) to the substantially vertical position. Thegates 220 assist workers to safely move to the floatingplatform 100. The installation pins 43 can also be removed from engagement with thecapture systems 30 of each half 10A, 10B of the floatingplatform 100. - Referring to
FIG. 4E (a side view of the centralizers 30), thepads 15 of the floatingplatform 100 contact thebase 210 of the fixedplatform 200 to minimize friction and prevent metal to metal wear between the floatingplatform 100 and the fixedplatform 200. Thepads 15 may also be replaceable to account for wear over time. Thecentralizers 30 are actuated into engagement with theriser string 5. Specifically, the upper andlower rollers riser string 5. The upper andlower rollers riser string 5 to allow theriser string 5 to be raised and lowered relative to the floatingplatform 100. In one embodiment, one or more guide members may be mounted to theriser string 5 to provide a constant path along which therollers riser string 5, however, is transferred to the floatingplatform 100 by thecentralizers 30. The floatingplatform 100 floats on top of and moves relative to the fixedplatform 200 with lateral movement of theriser string 5. -
FIGS. 5A-5C illustrate an operational sequence of moving ariser string flange 6 of theriser string 5 through the floatingplatform 100 and the fixedplatform 200. Theriser string 5 is comprised of multiple tubular members joined together. The ends of the tubular members may be connected together by a bolted, flanged connection. Since eachriser string flange 6 has an outer diameter that is greater than the outer diameter of theriser string 5, thecentralizers 30 have to be adjusted to allow eachriser string flange 6 to pass through the floatingplatform 100. - Referring to
FIG. 5A (a second side view of the centralizers 30), theriser string 5 is lowered through the floatingplatform 100 and the fixedplatform 200. All of thecentralizers 30 are engaged with theriser string 5. As theriser string flange 6 approaches the floatingplatform 100, thecentralizers 30 need to be sequenced to pass theriser string flange 6 through the floatingplatform 100. Otherwise, theriser string flange 6 may contact theupper rollers 31 and force the floatingplatform 100 and the fixedplatform 200 in a downward direction, potentially damaging theplatforms - Referring to
FIG. 5B (a third side view of the centralizers 30), theupper rollers 31 of thecentralizers 30 are retracted to allow theriser string flange 6 to be lowered through. Theriser string flange 6 is lowered into a position between theupper rollers 31 and thelower rollers 32. Thelower rollers 32 are still in engagement with theriser string 5. When theriser string flange 6 passes theupper rollers 31, theupper rollers 31 may be extended back into engagement with theriser string 5. - Referring to
FIG. 5C (a fourth side view of the centralizers 30), theupper rollers 31 are extended into engagement with theriser string 5. Thelower rollers 32 are retracted to allow theriser string flange 6 to continued to pass through the floatingplatform 100. When theriser string flange 6 passes thelower rollers 32, thelower rollers 32 may be extended back into engagement with theriser string 5. In one embodiment, thecentralizers 30 may comprise shrouded spring-loaded rollers on rocker arms that automatically extend and retract as theriser string flanges 6 pass through the floatingplatform 100. - As the
riser string 5 is deployed or retrieved thecentralizers 30 are extended and retracted in this manner to allow theriser string flanges 6 or any other enlarged outer diameter areas on theriser string 5 to pass through the floatingplatform 100. The floatingplatform 100 and the fixedplatform 200 allow rig workers to attach umbilical lines to the outer surface of theriser string 5 in a protected area that is fully enclosed by thegate 20. This protected area avoids the need for having to deploy a rescue boat when work is being performed in the moon pool area. Additionally, as will be described below, work being performed in the moon pool area may be accomplished without exposing workers directly to the sea below, as the fixedplatform 200 and floatingplatform 100 shall be underfoot of workers in the moon pool area. In this manner, the work performed over the moon pool area is not considered to be "work over the side." -
FIG. 6A illustrates a side view of an offshore platform, such as asemi-submersible platform 310. Indeed, although the presently illustrated embodiment of the offshore platform is a semi-submersible platform 310 (e.g., offshore semi-submersible drilling rig), other offshore platforms such as a drillship, a floating production system, or the like may be substituted for thesemi-submersible platform 310 such that the techniques and systems described below are intended to cover at least the additional above-noted offshore platforms. - As illustrated in
FIG. 6A , thesemi-submersible platform 310 may include ariser access platform 312. Theriser access platform 312 may include a platform housing 314 (e.g., disposed below a moon pool of the semi-submersible platform 310) that includes at least onebottom portion 316 extending, for example, in a parallel direction with thedeck 317different deck 317 this one is bottom and at least oneside portion 318 extending, for example, in a perpendicular direction to thedeck 317. In some embodiments, a space 320 (e.g., a moon pool area inclusive of a moon pool for theriser 5 to pass through) may separate thebottom portion 316 of theplatform housing 314. In one embodiment, theside portion 318 may fully surround the at least onebottom portion 316 so as to shield the internal space of theriser access platform 312 from natural elements (e.g., water, wind, etc.). - In other embodiments, the
side portion 318 may surround the perimeter of eachbottom portion 316 up tospace 320. In this embodiment, a vertical aperture may exist between eachbottom portion 316 and thedeck 317 along each edge of thespace 320. This aperture may be covered, for example, by a watertight retractable covering (not illustrated) that may extend from eachbottom portion 316 towards thedeck 317 and may have a height approximately equal toside portion 318. This retractable covering may be a moveable covering that can be moved from a primarily vertical extended position (shielding the internal space of theriser access platform 312 from natural elements) into a primarily horizontal retracted position (along the horizontal length of the deck 317) in a manner similar to a home garage door to allow for the techniques described below to be performed. - In at least one embodiment, the retractable covering may be disposed along each edge of
space 320 and may form a barrier (along withbottom portion 316 and side region 318) for internal space of theriser access platform 312. In a further embodiment, two separate portions (each inclusive of adistinct bottom portion 316, a distinct side portion 318 [which may include three portions coupled together along thebottom portion 316 or a single portion along the bottom portion 316], and a distinct retractable portion) may be combined to form theplatform housing 314. Additionally, in some embodiments, theside portion 318 may extend partially along the edge ofspace 320 such that the retractable covering does not fully extend along the edge ofspace 320. - The
riser access platform 312 houses amoveable platform 322 and a floatingplatform 324 that is movably coupled to the moveable platform 322 (e.g., the floatingplatform 324 may move in one or more directions with respect to themovable platform 322 while being coupled to the movable platform 322). As will be described in greater detail below, themoveable platform 322 and the floatingplatform 324 may operate in conjunction to allow work to be performed onriser 5 without the work constituting "work over the side." As illustrated inFIG. 6A , each of themoveable platform 322 and the floatingplatform 324 are illustrated as being disposed beneath thedeck 317. However, in other embodiments, each of themoveable platform 322 and the floating platform 324 (as well as the related elements described hereinafter) may instead be disposed on thedeck 317, on or below thedrill floor 326, or in another area of thesemi-submersible platform 310. Likewise, for example, themoveable platform 322 and the floatingplatform 324, when utilized in a drillship, may be located in the hull of the drillship. -
FIG. 6B illustrates a top view of theriser access platform 312. As illustrated, the riser access platform includes thebottom portion 316, themoveable platform 322, and the floatingplatform 324. As illustrated, themoveable platform 322 and the floatingplatform 324 are in their extended positions. In some embodiments, acontrol panel 328 may be provided to control, for example, the movement of each of themoveable platform 322, and the floatingplatform 324 into their extended and retracted positions. It should be noted that thecontrol panel 328 may operate in conjunction with software systems implemented as computer executable instructions stored in a non-transitory machine readable medium such as memory, a hard disk drive, or other short term and/or long term storage in thecontrol panel 328. Particularly, the techniques to operate thecontrol panel 328 may be performed using code or instructions stored in a non-transitory machine-readable medium (e.g., the memory and/or storage) and may be executed, for example, by the one or more processors or a controller ofcontrol panel 328. Accordingly, the controller of thecontrol panel 328 may be read as an application specific integrated circuit (ASIC), one or more processors, or another processing device that interacts with memory one or more tangible, non-transitory, machine-readable media that collectively stores instructions executable by the controller the method and actions described herein. By way of example, such machine-readable media can comprise RAM, ROM, EPROM, EEPROM, CD-ROM or other optical disk storage, magnetic disk storage or other magnetic storage devices, or any other medium which can be used to carry or store desired program code in the form of machine-executable instructions or data structures and which can be accessed by the processor or by any general purpose or special purpose computer or other machine with a processor. In some embodiments, control of the controller via thecontrol panel 328 may be performed by a user utilizing one or more user inputs (keys, buttons, joystick, a graphical user interface, etc.). - Additionally, to facilitate movement of separate portions of the
moveable platform 322, theriser access platform 312 may include platform extend and retractplatform tracks 330 that guide the portions of themoveable platform 322 along thebottom portion 316. Theriser access platform 312 may also include one or morelinear actuators 332 that provide motion in a straight line to allow for the extension and retraction of the portions of themoveable platform 322 along extend and retract platform tracks 330. In one embodiment, eachlinear actuator 332 may include a hydraulic cylinder. In some embodiments, the operation of eachlinear actuator 332 may be controlled by thecontrol panel 328. For example, in one embodiment, themoveable platform 322 may include two separate portions each moved by one or morelinear actuators 332 concurrently such that movement of each portion of themoveable platform 322 is common (e.g., performed at a common speed). In this manner, the one or morelinear actuators 332 may operate to extend and retract portions of themoveable platform 322 for storage and for operation. - As additionally, as illustrated in
FIG. 6B , themoveable platform 322 may include secondarylinear actuators 334. The secondarylinear actuators 334 may facilitate retraction and extension of separate portions of the floatingplatform 324 to allow for connection and disconnection of the portions of the floatingplatform 324 along floating platform extend and retracttracks 336 that guide the separate portions of the floatingplatform 324 along themoveable platform 322. In one embodiment, eachlinear actuator 334 may include a hydraulic cylinder and the operation of eachlinear actuator 334 may be controlled by thecontrol panel 328. For example, in one embodiment, the floatingplatform 324 may include two separate portions each moved by one or morelinear actuators 334 concurrently such that movement of each portion of the floatingplatform 324 is common (e.g., performed at a common speed). In this manner, the one ormore actuators 334 may operate to extend and retract portions of the floatingplatform 324 for operation and for storage. - In one embodiment, the one or
more actuators 334 may be positioned on one or more secondary actuator tracks 338 that allow for the movement of theactuators 334 to maintain a relative position with the floating platform 324 (e.g., so that theactuators 334 remain generally disposed about the riser 5). In some embodiments, theactuators 334 may also be utilized to control motion of the floatingplatform 324. For example, thecontrol panel 328 may cause theactuators 334 to provide a resistance force against the floatingplatform 324 when the floating platform moves in a linear direction towards arespective actuator 334. In some embodiments, the amount of resistance force is inversely proportional to the distance from the floatingplatform 324 to the respective actuator 334 (e.g. as the distance between the floatingplatform 324 and therespective actuator 334 decreases, the pressure applied to the floatingplatform 324 by therespective actuator 334 increases). In some embodiments, one or more sensors may be utilized to measure and/or detect the movement of the floatingplatform 324 and transmit an indication of the movement to thecontrol panel 328, which may generate a signal to control arespective actuator 334 to provide a predetermined resistance force, as described above. In other embodiments, the one ormore actuators 334 may be passively controlled and set up to provide a predetermined resistance force in response to the movement of the floatingplatform 324. - Additionally, as illustrated in
FIG. 6B ,platform 324 may include one or more floating platformlinear actuators 340. The floating platformlinear actuators 340 may be positioned on the floating platform extend and retracttracks 336 to allow for the movement of theactuators 340 to maintain a relative position with the floating platform 324 (e.g., so that theactuators 340 remain generally disposed about the riser 5). In some embodiments, theactuators 340 may also be utilized to control motion of the floatingplatform 324. For example, thecontrol panel 328 may cause theactuators 340 to provide a resistance force against the floatingplatform 324 when the floating platform moves in a linear direction towards or away from theactuators 340. In some embodiments, the amount of resistance force may be related to the distance from the floatingplatform 324 to the actuators 340 (e.g., as the distance between the floatingplatform 324 and therespective actuator 340 moves towards a predetermined minimum or a predetermined maximum distance value, the pressure applied to the floatingplatform 324 to counter the movement of the floatingplatform 324 by the one ormore actuators 340 increases). In some embodiments, one or more sensors may be utilized to measure and/or detect the movement of the floatingplatform 324 and transmit an indication of the movement to thecontrol panel 328, which may generate a signal to control the one ormore actuators 340 to provide a predetermined resistance force, as described above. In other embodiments, the one ormore actuators 340 may be passively controlled and set up to provide a predetermined resistance force in response to the movement of the floatingplatform 324 aboutaperture 342 of themoveable platform 322 in whichriser 5 moves (e.g., in response to nature or other influences). - In one embodiment, barriers 344 (e.g., handrails, guards, or the like) may be utilized, for example, on the
moveable platform 322, the floatingplatform 324, and/or thebottom portion 316. One or more gates or other openings in thebarriers 344 may be provided to allow access of a worker onto and off of themoveable platform 322 and/or the floatingplatform 324. Additionally, as will be described in greater detail below with respect toFIG. 6G , theriser access platform 312 may also include aninterlock system 346 that is utilized to couple the portions of the floatingplatform 324 together, a two dimensional (2D)roller assembly 348 that facilitates movement of the floatingplatform 324 whenriser 5 moves inaperture 342, and aroller guide assembly 350 disposed in an aperture of the floatingplatform 324 thatcontacts riser 5. However, prior to discussion of theinterlock system 346, the2D roller assembly 348, and theroller guide assembly 350, the sequence of the extension of themoveable platform 322 and the floatingplatform 324 will be discussed in relation toFIGS. 6C-6F . -
FIGS. 6C-6F illustrate top views of themoveable platform 322 and the floatingplatform 324 during movement from a storage position to an extended (operational position).FIG. 6C illustrates a first portion of themoveable platform 322A and a second portion of themoveable platform 322B in a storage position (e.g., non-extended from bottom portion 316). Similarly,FIG. 6C illustrates a first portion of the floatingplatform 324A and a second portion of themoveable platform 324B in a storage position (e.g., non-extended from bottom portion 316). In some embodiments, one or more locking mechanisms (not illustrated), such as any type of mechanical locking device may be utilized to secure each of the first portion of themoveable platform 322A and a second portion of themoveable platform 322B and/or the first portion of the floatingplatform 324A and the second portion of themoveable platform 324B in respective storage positions. InFIG. 6D , the one or more linear actuators 332 (e.g., as controlled by the control panel 328) may cause the first portion of themoveable platform 322A and a second portion of themoveable platform 322B to extend into space 320 (e.g., across the moon pool area). - As illustrated in
FIG. 6E , the one or morelinear actuators 332 complete movement of the first portion of themoveable platform 322A and a second portion of themoveable platform 322B to formmoveable platform 322. At this time, the one or more secondary linear actuators 334 (e.g., as controlled by the control panel 328) may cause the first portion of the floatingplatform 324A and the second portion of the floatingplatform 324B to extend over theaperture 342 of themoveable platform 322. InFIG. 6F , the one or more secondarylinear actuators 334 complete movement of the first portion of the floatingplatform 324A and a second portion of themoveable platform 324B to form floatingplatform 324. Once coupled, the floatingplatform 324 may move about themoveable platform 322 in response to movements by theriser 5 inaperture 342 of themoveable platform 322. In this manner, one or more workers may be able to stand on the floatingplatform 324 to perform work on theriser 5 without the work being considered over the side work (e.g., due at least to the floatingplatform 324 being underfoot of the one or more workers and/or due to the enclosure of the one or more workers by barriers 344). -
FIG. 6G illustrates an isometric view of theriser access platform 312. As previously discussed with respect toFIG. 6B , theriser access platform 312 includes an interlock system 346 (e.g., any type of locking device), which is illustrated in greater detail inFIG. 6G . Theinterlock system 346 includes alocking pin 353 that is utilized to couple theportions platform 324 together. In some embodiments, the lockingpin 353 may engage with alocking block 354 to couple theportions platform 324 together. In some embodiments, the lockingpin 353 may be manually or automatically inserted through the floatingplatform 324 and more than oneinterlock system 346 may be utilized in conjunction with theriser access platform 312. In another embodiment, the lockingpin 353 may couple bothportions platform 324 together as well asportions movable platform 322 together. - Additionally,
FIG. 6G illustrates the2D roller assembly 348 that facilitates movement of the floatingplatform 324 in conjunction with the movement of theriser 5 inaperture 342. The2D roller assembly 348 includes aroller track 356 that allows for movement of the floatingplatform 324 in a direction generally parallel to the direction of the secondary actuator tracks 338 and generally perpendicular to the direction of the floating platform extend and retracttracks 336. The 2D roller assembly also includes a 2Dmotion roller assembly 358 that allows for respective motion of the floatingplatform 324 in two directions (e.g., in a direction generally parallel to the direction of the secondary actuator tracks 338 and in a direction generally parallel to the direction of the floating platform extend and retract tracks 336). - In some embodiments, the 2D
motion roller assembly 358 may operate to allow movement of the floatingplatform 324 in a first direction (e.g., in a direction generally parallel to the direction of the secondary actuator tracks 338) while restricting motion in a second direction (e.g., in a direction generally parallel to the direction of the floating platform extend and retract tracks 336). The 2Dmotion roller assembly 358 may also operate to allow movement of the floatingplatform 324 in the second direction (e.g., in a direction generally parallel to the direction of the floating platform extend and retract tracks 336) while restricting motion in the first direction (e.g., in a direction generally parallel to the direction of the secondary actuator tracks 338). Alternatively, themotion roller assembly 358 may also operate to allow movement of the floatingplatform 324 in both the first direction (e.g., in a direction generally parallel to the direction of the secondary actuator tracks 338) and the second direction (e.g., in a direction generally parallel to the direction of the floating platform extend and retract tracks 336). Moreover, as previously discussed, the motion of the floatingplatform 324 may be caused by movement of theriser 5 in theaperture 342 to allow workers to work onriser 5 while engaged with the floatingplatform 324. -
FIG. 6G further illustrates theroller guide assembly 350 disposed in anaperture 352 of the floatingplatform 324. In some embodiments, theaperture 352 may be surrounded by a foot barrier (not illustrated). The foot barrier may be a guard or rail that extends vertically from the surface of the floatingplatform 324 about theaperture 352. Additionally, theroller guide assembly 350 may operate to engage the floatingplatform 324 with theriser 5 while still allowing for vertical movement of the riser with respect to the floating platform. Detailed versions of theroller guide assembly 350 are illustrated in conjunction withFIGS. 7A-7C . -
FIG. 7A illustrates an isometric view of theroller guide assembly 350. As illustrated, theroller guide assembly 350 may include one or moreriser centralizing rollers 360 that interact with arespective riser fin 362 of theriser 5. In one embodiment, each of theriser centralizing rollers 360 allows for theriser 5 to move vertically and positions theriser 5 centrally inaperture 352. In one embodiment, each of theriser centralizing rollers 360 is moveably coupled to arespective riser fin 362 of theriser 5 such that each of theriser centralizing rollers 360 rolls when theriser 5 moves in a vertical direction.FIG. 7B illustrates a top view of theroller guide assembly 350 and further details the interaction of theriser centralizing rollers 360 with theriser fins 362. - As illustrated in
FIG. 7B , theriser centralizing rollers 360 may be disposed about theaperture 352 and may each engage arespective riser fin 362. Also illustrated inFIG. 7B , one or more umbilical lines 364 (e.g., one or more chemical, hydraulic, and/or electrical conductors for power and control systems), one or more choke/kill lines 366 (e.g., conduits arranged along theriser 5 for circulation of fluids into and out of a well bore to control well pressure), and a riser slick joint 368. Additionally illustrated inFIG. 7B is a sectional cutout "A" of theriser 5 and theroller guide assembly 350, as further illustrated inFIG. 7C . -
FIG. 7C illustrates the sectional cutout "A" ofFIG. 7B . As illustrated, theriser centralizing rollers 360 may include aroller cushion assembly 370 that allows theriser centralizing rollers 360 to maintain a movable engagement with theriser fins 362 of theriser 5. For example, as a joint of theriser 5 passes theriser centralizing rollers 360, theroller cushion assembly 370 may allow theriser centralizing rollers 360 to move in a direction away from theriser 5 while still maintaining sufficient pressure on theriser 5 to maintain its horizontal positioning within theaperture 352. -
FIGS. 8A-8C illustrate various versions of theriser 5. It should be noted that in some embodiments,riser 5 has noriser fins 362. As illustrated inFIG. 8A ,riser 5 may include amain portion 372. Theriser fins 362 may be disposed about themain portion 372. For example, theriser fins 362 may be disposed equidistant (approximately 90 degrees) from one another about themain portion 372. Additionally, as illustrated in the profile view of theriser 5, theriser fins 362 may extend alength 374 less than anentire length 376 of ariser 5. In one embodiment, theriser fins 362 may taper at the ends of thelength 374 of theriser 5 such that theriser fins 362 terminate at a joint 378 of theriser 5. In this manner, theriser fins 362 may extend aconstant distance 380 from themain portion 372 of theriser 5 so that there is a consistent surface atdistance 380 around themain portion 372 of theriser 5. -
FIG. 8B illustrates a second embodiment of theriser 5. In the illustrated embodiment, theriser 5 includes sixriser fins 362. Each of the sixriser fins 362 may be disposed about themain portion 372. For example, eachriser fin 362 may be disposed equidistant (approximately 60 degrees) from one another about themain portion 372. By utilizing sixriser fins 362, additional ease of stacking and storing therisers 5 may be accomplished. -
FIG. 9 illustrates a second embodiment of the floatingplatform 324. In the illustrated embodiment, eachportion apertures 382.Apertures 382 may be similar toaperture 352 discussed above, however, by having twoapertures 382,multiple risers 5 may pass through the floatingplatform 324. It should further be noted that while twoapertures 382 are illustrated, more than two apertures are contemplated. Furthermore, it should be noted that eachaperture 382 may allow a riser to pass through asingle aperture 342 of themoveable platform 322 or throughdistinct apertures 342 that each correspond to arespective aperture 382. - Present techniques and systems allow for use of a floating platform and/or a floating platform in conjunction with a moveable platform that span a moon pool area of an offshore platform. Through the use of the floating platform, work on a riser that typically would be characterized as "work over the side" may be re-characterized as not constituting "work over the side." Accordingly, riser work, which might otherwise be delayed due to events (harsh weather conditions, etc.), may be performed. This allows for less downtime of the offshore platform and, therefore, increases the efficiency of the offshore platform.
- This written description uses examples to disclose the above description, including the best mode, and also to enable any person skilled in the art to practice the disclosure, including making and using any devices or systems and performing any incorporated methods. The patentable scope of the disclosure is defined by the claims, and may include other examples that occur to those skilled in the art. Such other examples are intended to be within the scope of the claims if they have structural elements that do not differ from the literal language of the claims, or if they include equivalent structural elements with insubstantial differences from the literal languages of the claims. Accordingly, while the above disclosed embodiments may be susceptible to various modifications and alternative forms, specific embodiments have been shown by way of example in the drawings and have been described in detail herein. However, it should be understood that the embodiments are not intended to be limited to the particular forms disclosed. Rather, the disclosed embodiment are to cover all modifications, equivalents, and alternatives falling within the scope of the embodiments as defined by the following appended claims.
Claims (15)
- A system, comprising:a first platform (210, 322) configured to be moveable between a storage position and a fixed working position in a moon pool area (320) of an offshore platform (310); anda second platform (100, 324) configured to be movably coupled to a first surface of the first platform (210, 322) over the moon pool area (320), wherein the second platform (100, 324) is configured to move in at least two perpendicular directions across the first surface of the first platform (210, 322) in response to movements by a riser (5).
- The system of claim 1, wherein the offshore platform (310) comprises an offshore semi-submersible drilling rig or a drillship.
- The system of claim 1, wherein the first movable platform (210, 322) comprises a first aperture (214, 342) sized to allow the riser (5) to pass through the first aperture (214, 342), wherein the second movable platform (100, 324) comprises a second aperture (14, 352) sized to allow the riser (5) to pass through the second aperture (100, 352).
- The system of claim 3, wherein the second movable platform (100, 324) comprises at least one centralizing roller (31, 360) configured to be movably coupled to the riser (5).
- The system of claim 4, wherein the centralizing roller (31, 32, 360) is configured to be movably coupled to the riser via a riser fin (362) of the riser (5).
- The system of claim 5, further comprising the riser (5), wherein the riser fin (362) comprises a tapered portion coupled to a joint of the riser to form a continuous surface along a length (374) of the riser (5).
- The system of claim 5, further comprising the riser (5), wherein the riser (5) comprises a second riser fin, a third riser fin, and a fourth riser fin.
- The system of claim 7, wherein each of the riser fin (362), the second riser fin, the third riser fin, and the fourth riser fin are disposed equidistant from one another about the riser (5).
- The system of claim 1, comprising an enclosure housing for each of the first moveable platform (322) and the second movable platform (324).
- The system of claim 9, wherein the enclosure housing is configured to be disposed beneath a bottom deck (317) of the offshore platform (310).
- The system of claim 9, wherein the enclosure (312) comprises a retractable covering disposed along an edge of the moon pool area (320).
- A method, comprising:moving a first portion (210A, 322A) of a moveable platform (210, 322) from a first position in an offshore platform (310) to a second position over a moon pool area (320) of the offshore platform (310);moving a first portion (10A, 324A) of a second moveable platform (100, 324) from the first position to a third position over the moon pool area (320);moving a second portion (210B, 322B) of the moveable platform (210, 322) from a fourth position in the offshore platform (310) to a fifth position over the moon pool area (320) to form a first surface ; andmoving a second portion (10B, 324B) of the second moveable platform (100, 324) from the fourth position to a sixth position over the moon pool area (320) to form a second surface , wherein the second moveable platform (100, 324) is configured to move in at least two perpendicular directions across the first surface of the first moveable platform (322).
- The method of claim 12, comprising coupling the first portion (210A, 322A) of the moveable platform (200, 322) in the second position to the second portion (210B, 322B) of the moveable platform (200, 322) in the fifth position.
- The method of claim 12, comprising coupling the first portion (10A, 324A) of the second moveable platform (100, 324) in the third position to the second portion (10B, 324B) of the second moveable platform (100, 324) in the sixth position via a locking device (353, 354).
- The method of claim 12, comprising coupling the first portion (10A, 324A) of the second moveable platform (100, 324) in the third position and the second portion (10B, 324B) of the second moveable platform (324) in the sixth position to a riser (5) of the offshore platform (310).
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
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US14/663,698 US9361792B2 (en) | 2014-03-21 | 2015-03-20 | Self positioning floating platform and method of use |
PCT/US2016/023222 WO2016154035A1 (en) | 2015-03-20 | 2016-03-18 | Self positioning floating platform and method of use |
Publications (3)
Publication Number | Publication Date |
---|---|
EP3271542A1 EP3271542A1 (en) | 2018-01-24 |
EP3271542A4 EP3271542A4 (en) | 2018-12-05 |
EP3271542B1 true EP3271542B1 (en) | 2020-01-01 |
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ID=56979280
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
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EP16769435.5A Active EP3271542B1 (en) | 2015-03-20 | 2016-03-18 | Self positioning floating platform and method of use |
Country Status (3)
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EP (1) | EP3271542B1 (en) |
CA (1) | CA2980017C (en) |
WO (1) | WO2016154035A1 (en) |
Family Cites Families (9)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US4068487A (en) * | 1976-04-30 | 1978-01-17 | The Offshore Company | Method and apparatus for conducting subaqueous operations in ice conditions |
US6260625B1 (en) * | 1999-06-21 | 2001-07-17 | Abb Vetco Gray, Inc. | Apparatus and method for torsional and lateral centralizing of a riser |
NO310736B1 (en) * | 2000-01-03 | 2001-08-20 | Aker Mh As | Module-based lightweight drilling rig |
US6871609B2 (en) * | 2002-08-30 | 2005-03-29 | Itrec B.V. | Multipurpose tower for monohull |
US6884003B2 (en) * | 2003-06-16 | 2005-04-26 | Deepwater Technologies, Inc. | Multi-cellular floating platform with central riser buoy |
WO2008118914A1 (en) * | 2007-03-26 | 2008-10-02 | Technip France | Parallel drilling and completion for a dry tree floating production facility |
KR101630630B1 (en) * | 2008-02-15 | 2016-06-24 | 아이티알이씨 비. 브이. | Offshore drilling vessel |
US8573308B2 (en) * | 2008-09-09 | 2013-11-05 | Bp Corporation North America Inc. | Riser centralizer system (RCS) |
WO2011135541A2 (en) * | 2010-04-28 | 2011-11-03 | Rolls-Royce Marine As | Modular multi-workstring system for subsea intervention and abandonment operations |
-
2016
- 2016-03-18 CA CA2980017A patent/CA2980017C/en not_active Expired - Fee Related
- 2016-03-18 EP EP16769435.5A patent/EP3271542B1/en active Active
- 2016-03-18 WO PCT/US2016/023222 patent/WO2016154035A1/en active Application Filing
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EP3271542A4 (en) | 2018-12-05 |
CA2980017A1 (en) | 2016-09-29 |
CA2980017C (en) | 2019-02-26 |
EP3271542A1 (en) | 2018-01-24 |
WO2016154035A1 (en) | 2016-09-29 |
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