WO2008129320A1 - Methods of and apparatus for mooring and for connecting lines to articles on the seabed - Google Patents
Methods of and apparatus for mooring and for connecting lines to articles on the seabed Download PDFInfo
- Publication number
- WO2008129320A1 WO2008129320A1 PCT/GB2008/050271 GB2008050271W WO2008129320A1 WO 2008129320 A1 WO2008129320 A1 WO 2008129320A1 GB 2008050271 W GB2008050271 W GB 2008050271W WO 2008129320 A1 WO2008129320 A1 WO 2008129320A1
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- tether
- mooring
- connector
- free end
- portions
- Prior art date
Links
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B63—SHIPS OR OTHER WATERBORNE VESSELS; RELATED EQUIPMENT
- B63B—SHIPS OR OTHER WATERBORNE VESSELS; EQUIPMENT FOR SHIPPING
- B63B21/00—Tying-up; Shifting, towing, or pushing equipment; Anchoring
- B63B21/22—Handling or lashing of anchors
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B63—SHIPS OR OTHER WATERBORNE VESSELS; RELATED EQUIPMENT
- B63B—SHIPS OR OTHER WATERBORNE VESSELS; EQUIPMENT FOR SHIPPING
- B63B21/00—Tying-up; Shifting, towing, or pushing equipment; Anchoring
- B63B21/04—Fastening or guiding equipment for chains, ropes, hawsers, or the like
Definitions
- This invention relates to methods of and apparatus for connecting lines to articles on the seabed.
- the primary purpose is to provide a mooring apparatus and a method of mooring suitable for use with large offshore production vessels, such as drilling vessels and production buoys.
- the invention can be applied anywhere where it is desired to attach a heavy tether to an article already deployed on the seabed, for anchoring another article, or for lifting the seabed article itself.
- tether will be used to refer to a mooring leg, but also includes a hoisting cable or chain, unless the context requires otherwise.
- a typical mooring system for a production vessel comprises a loading buoy (otherwise known as a catenary anchor leg mooring (CALM) buoy) having a number of anchors deployed about it to hold the buoy in position via connecting lines.
- a typical arrangement for the deployment of these anchors is in a circle centred on the buoy. This type of arrangement means that the loads and forces that will be exerted on the buoy by the sea and climatic conditions can be resisted no matter the direction from which they originate. Normally any moored vessel will be able to rotate (or “weathervane”) in relation to the buoy.
- the vessel may be directly anchored to the seabed without use of a loading buoy.
- the present invention may be used to set an array of anchors in the seabed about the buoy/vessel.
- the anchors may comprise simple weights, suction anchors or drag- embedment anchors.
- the buoy or production vessel is held in place by a series of anchors buried in the seabed.
- This normally means between 6 and 12 anchors equidistantly spaced (or spaced in groups) about the circumference of a circle formed with the buoy at its centre so that the buoy is held in place.
- Each anchor is at the end of a mooring leg extending from the vessel or buoy to the seabed.
- the terms "mooring leg” and “main tether” are used to encompass a variety of specific forms of tether, of which heavy chain is the most typical example. Other forms of mooring leg are of course possible, and often comprise sections of chain and sections of cable, connected together according to the properties required at each point along their extent.
- conventional methods involve locating and deploying the anchor with it connected to a mooring leg of the buoy.
- the anchor is therefore deployed with the full weight of the chain, which forms a part of the mooring leg and connects the anchor to the loading buoy.
- the sheer weight even with the apparent lightening effect of the water becomes burdensome and difficult to operate with.
- the buoy or vessel to be moored has to be on site when the operation is being carried out, which could be a number of days. Logistically this is inefficient as the buoy/vessel is in effect out of service and the operation is more difficult to timetable.
- tether connection apparatus for remotely interconnecting respective free ends of first and second portions of a mooring tether, said apparatus comprising: pull-in means operable to pull-in to said apparatus the free end of one of said portions of mooring tether, subsequent to deployment of the apparatus; means for releasably mounting a connector, said means being designed to mount a connector that is operable to interconnect the respective free ends of said first and second portions of the mooring tether, once said pull-in means has pulled in to said apparatus the free end of a first of said portions of mooring tether, said means being operable to release the connector subsequent to interconnection.
- Said tether connection apparatus may be operable to have said connector mounted to said means for releasably mounting a connector, wherein said connector is attached to the free end of a second of said portions of mooring tether, prior to deployment of the apparatus
- Said tether connection apparatus may be operable such that said first of said portions of mooring tether is attached to an anchor on the seabed, while the second of said portions of mooring tether is attached to an object to be moored.
- Said means for releasably mounting a connector may be designed specifically to enable mounting of standard connectors, already commonly used for connecting lines, or portions of lines together.
- Such connectors may be any of the type commonly used to connect together, for example, chain with chain, chain with wire or wire with wire, as appropriate.
- Such connectors may include, a shackle with associated pin, spelter sockets, chain links or triplates. This means that expensive and complicated purpose made mooring line connectors can be dispensed with.
- Said means for releasably mounting a connector may be adapted to be able to mount two or more types of connectors.
- Said apparatus may further comprise a suitable connector, pre-installed on said means for releasably mounting a connector.
- Said apparatus may further comprise alignment means for aligning one portion of the mooring tether with the other prior to their being interconnected.
- Said alignment means may comprise a channel.
- Said channel may be arranged to accommodate the free end of said portions of mooring tether to correctly locate and align said free end, for subsequent interconnection.
- Said channel may have a relatively wide opening, tapering inwards, thus forming a funnel shape.
- Said channel may include a restricted section for locating and orienting one of said free ends of portion of mooring tether.
- Said restricted section may include one or more locating pins.
- Said one or more locating pins may be designed to cooperate with and therefore properly locate and orientate a link of mooring chain.
- Said one or more locating pins may be adaptable, either by themselves or by way of the addition of an adaptor, so to be able to properly position wire, as well as chain.
- Said channel may be located on carriage allowing movement of said channel, and therefore said portion of said mooring leg located therein, relative to said first portion of the mooring tether and/or said connecting means.
- Said carriage may allow movement along the axis of the connection. The carriage may also allow for lateral movement.
- Said pull-in means may comprise a winch.
- a method of mooring an object to the seabed using the tether connection apparatus of the first aspect of the invention comprising: installing a connector on said tether connection apparatus; installing at least one anchor on the seabed, said anchor having a first portion of mooring tether attached thereto.
- the step of installing said connector on said tether connection apparatus may be done as an initial step such that the connector is pre-installed on said tether connection apparatus.
- said connecting of the free end of a second portion of mooring tether to said connector may be done prior to the deployment step, for example when installing said tether connection apparatus to the free end of a second portion of mooring tether.
- Some or all of these steps may be done on an installation vessel.
- the free end of a second portion of mooring tether may be connected to said tether connection apparatus before installation of the connector.
- the step of installing said connector on said tether connection apparatus may be done after deployment of the tether connection apparatus.
- the connecting of the free end of a second portion of mooring tether to said connector will also be done after deployment, once said connector has been installed on said tether connection apparatus.
- Said first and second portions of mooring tether may consist of chain or wire.
- said first portion consists of chain and said second portion consists of wire.
- One or more of the steps including and subsequent to the deployment step may be done by a Remotely Operated Vehicle (ROV).
- ROV Remotely Operated Vehicle
- Said method preferably comprises the final step of recovering said tether connection apparatus. This may be done by an ROV.
- Said method may further comprise the step of aligning one portion of the mooring tether with the other prior to their being interconnected.
- it is the free end of first portion of the mooring tether that is aligned relative to the free end of said second portion of the mooring tether and connector.
- Said free end of first portion of the mooring tether may be pulled into a channel comprised in said tether connection apparatus to correctly locate and align said free end, for subsequent interconnection.
- Said channel, and therefore said portion of said mooring leg located therein may be moved relative to second portion of the mooring tether and said connecting means to aid alignment.
- Said connector may comprise a shackle with associated pin, spelter sockets, chain links or triplates.
- Said first portion of mooring tether may be pre-routed on the seabed prior to it being pulled-in to said tether connection apparatus.
- Figure 1 shows (a) a plan of a production vessel mooring arrangement, and (b) a side view of part of the arrangement;
- FIG. 2 shows a pull-in and connection device in accordance with an embodiment of the invention
- Figure 3 a to 3k depict a method of installing a mooring leg using the device according to an embodiment of the invention.
- FIG. 1 of the accompanying drawings shows a typical schematic representation of an installation of a floating production vessel P moored in place via buoy B such that it can "weathervane” around the buoy B.
- the buoy B is held in place using 8 (eight) anchors 1 fixed to the buoy B by chains C of respective mooring legs and buried in the seabed so that they are equally spaced around the circumference of a circle centred on the vessel P.
- FIG. 2 shows a device 100 suitable for undertaking chain and wire pull-in and connection of mooring legs subsea.
- the mooring legs in this example are Chain- Wire, but could be Chain- Chain, Wire- Wire, or Wire- Chain.
- the device 100 comprises a frame 110, an alignment system 120, a connector 140 and shackle/socket pin 160, preinstalled on said frame 110, and a pull in winchl80. Also shown are the first chain section 200a of the mooring leg 200 and the second wire section 200b of the mooring leg 200.
- this comprises a carriage 220 movable along the frame 110 on tracks 240. On the carriage is a funnel 260 leading to a narrow channel 270 with locating pins 280 therein.
- the device 100 is pre-installed onto one end of one of the portions 200b of the mooring leg 200 to be connected.
- the device 100 has remote operated functions, controlled by, and powered from, a Remotely Operated Vehicle (ROV), for pull-in, alignment and locking of the other portion of the mooring leg, installation and securing of shackle/socket pin and release of connection from device 100.
- ROV Remotely Operated Vehicle
- Pull-in and connection operations can be performed on seabed or midwater.
- FIGS 3a to 3k depict a method of installing a mooring leg 200 using the device 100 described above.
- the loading buoy that is to be moored is suspended by a crane, temporary suspended midwater and held in place by a deadman anchor on the seabed or held in position on the surface.
- the mooring anchor 1 is also installed on the seabed with its portion of the mooring leg 200a (in this case a chain, although it may be wire, rope or of other suitable construction) attached, this chain being pre-routed on the seabed such that its free end is in the vicinity of the buoy;
- Figure 3a shows one end of the other portion of the mooring leg 200b, which had been previously abandoned on the seabed, being picked up by a Remotely
- ROV Operated Vehicle
- a shackle and pin 160 with locking plate is installed to the socket 335 at the end of the mooring leg 200b, and an ROV releasable locking beam is used to secure the fixing to the device 100.
- Figure 3e shows the tugger line 320 being disconnected, this being done after disconnection of the holdback slings and attachment of the device 100 to the crane wire 315.
- the wire portion 200b of the mooring leg 200, with the device 100 attached can now be deployed ;
- Figure 3f shows the device having been lowered to about 1 metre above the seabed, and within about 20 metres of the end of the chain portion 200a to which it is to be connected.
- the pull-in wire/tether 340 from the winch 180 on the device 100 is attached to the free end of the chain mooring leg 200a (pre- routed on seabed, the other end being attached to the anchor);
- Figure 3g shows the ROV 310 using its torque tool to operate the winch 180 so that the pre-routed chain mooring leg 200a is pulled in to the device 100, until the chain hits stops on the device 100; In doing so it pulls the chain 200a into a funnel or channel 260.
- This funnel or channel 260 aligns the chain connector, in this case the final chain link 130, laterally with the wire connector 140. while the pins 280 locate in another chain link 250, thus holding that link 250, and as a result the connector 130, vertical.
- the ROV then uses its torque tool to lock and align the chain 200a in the device 100.
- the winch wire 340 is then removed, while a stop is placed between chain links 1 and 3 to hold the chain in place.
- Figure 3h shows the ROV using its torque tool to move the alignment carriage 220 toward the shackle 160. Precise longitudinal alignment can be made moving the carriage along the frame until the end of the chain 100a is aligned properly with the shackle 160. This carriage may also be movable laterally to aid alignment.
- Device 100 is then recovered to the installation vessel.
- Figure 3k shows the ROV releasing the shackle connected to the socket, the connection now being complete.
- the connector (a shackle and socket pin in the above example, although use of any suitable connector is envisaged) does not need to be pre-installed, and instead could be installed after deployment using an ROV.
- the above example is shown in relation to mooring a loading buoy, but other applications for this apparatus and method include, but are not limited to, the connections for the mooring lines of FPSOs (Floating, Production, Storage and Offloading vessels), rigs and riser systems.
- FPSOs Floating, Production, Storage and Offloading vessels
- the pins 280 of the alignment system may be adapted should it be a wire portion of a mooring leg that requires pulling in and aligning.
- Said pins 280 may be adaptable, either by themselves or by way of the addition of an adaptor, so to be able to properly position both chain and wire.
Abstract
Description
Claims
Priority Applications (6)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
BRPI0810367-4A BRPI0810367B1 (en) | 2007-04-20 | 2008-04-18 | CHAIN CONNECTION APPLIANCE AND METHOD FOR TIING AN OBJECT TO THE SEA BED |
US12/596,804 US8176866B2 (en) | 2007-04-20 | 2008-04-18 | Methods of and apparatus for mooring and for connecting lines to articles on the seabed |
EP08737196A EP2148807B1 (en) | 2007-04-20 | 2008-04-18 | Methods of and apparatus for mooring and for connecting lines to articles on the seabed |
DE602008005131T DE602008005131D1 (en) | 2007-04-20 | 2008-04-18 | METHOD AND DEVICES FOR FIXING AND CONNECTING LINES TO OBJECTS ON THE SEA BOTTOM |
AT08737196T ATE499280T1 (en) | 2007-04-20 | 2008-04-18 | METHOD AND DEVICES FOR MOORING AND CONNECTING LINES TO OBJECTS ON THE SEABOTTOM |
AU2008240391A AU2008240391B2 (en) | 2007-04-20 | 2008-04-18 | Methods of and apparatus for mooring and for connecting lines to articles on the seabed |
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
GB0707673.0 | 2007-04-20 | ||
GBGB0707673.0A GB0707673D0 (en) | 2007-04-20 | 2007-04-20 | Methods of and apparatus for mooring and for connecting lines to articles on the seabed |
Publications (1)
Publication Number | Publication Date |
---|---|
WO2008129320A1 true WO2008129320A1 (en) | 2008-10-30 |
Family
ID=38135155
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
PCT/GB2008/050271 WO2008129320A1 (en) | 2007-04-20 | 2008-04-18 | Methods of and apparatus for mooring and for connecting lines to articles on the seabed |
Country Status (8)
Country | Link |
---|---|
US (1) | US8176866B2 (en) |
EP (1) | EP2148807B1 (en) |
AT (1) | ATE499280T1 (en) |
AU (1) | AU2008240391B2 (en) |
BR (1) | BRPI0810367B1 (en) |
DE (1) | DE602008005131D1 (en) |
GB (1) | GB0707673D0 (en) |
WO (1) | WO2008129320A1 (en) |
Cited By (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
GB2483701A (en) * | 2010-09-17 | 2012-03-21 | Acergy France Sa | A line handling apparatus for mooring line connection |
US8176866B2 (en) | 2007-04-20 | 2012-05-15 | Acergy Norway As | Methods of and apparatus for mooring and for connecting lines to articles on the seabed |
WO2014011619A1 (en) * | 2012-07-10 | 2014-01-16 | Chevron U.S.A. Inc. | Apparatus and anchor handling vessels for installing or removing and replacing a segment of a mooring line |
EP2578488A4 (en) * | 2010-06-07 | 2016-05-04 | Vicinay Cadenas S A | Apparatus for vertically linking two sections of chain |
US10760241B2 (en) | 2016-06-16 | 2020-09-01 | Acergy France SAS | Upgrading subsea foundations of mooring systems |
Families Citing this family (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US9879396B2 (en) * | 2013-06-24 | 2018-01-30 | Trendsetter Vulcan Offshore, Inc. | Systems and methods for tethering subsea structure mounted on a wellhead |
Citations (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US4417830A (en) * | 1980-02-11 | 1983-11-29 | Constructors John Brown Limited | Connector assembly |
GB2311503A (en) * | 1996-03-28 | 1997-10-01 | Alcatel Kabel Norge As | Anchoring a cable or riser pipe |
WO2001032501A1 (en) * | 1999-11-01 | 2001-05-10 | Offshore Energy Development Corporation | Subsea anchor line connection method and connector for use therein |
EP1283158A1 (en) * | 2001-08-06 | 2003-02-12 | Single Buoy Moorings Inc. | Anchor line installation method and connector for use in said method |
Family Cites Families (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US5364075A (en) * | 1992-09-03 | 1994-11-15 | Smith Berger Marine, Inc. | Retractable mount for a mooring line guide and process for operating the same |
GB0104313D0 (en) | 2001-02-07 | 2001-04-11 | Stolt Offshore Sa | Mooring apparatus and method of mooring |
US6651580B2 (en) * | 2002-02-22 | 2003-11-25 | Globalsantafe Corporation | Method and system for mooring |
SE526076C2 (en) * | 2003-05-14 | 2005-06-28 | Gva Consultants Ab | Sealing device and method for sealing between a chain and a chain shaft |
GB0707673D0 (en) | 2007-04-20 | 2007-05-30 | Acergy Norway As | Methods of and apparatus for mooring and for connecting lines to articles on the seabed |
-
2007
- 2007-04-20 GB GBGB0707673.0A patent/GB0707673D0/en not_active Ceased
-
2008
- 2008-04-18 AT AT08737196T patent/ATE499280T1/en not_active IP Right Cessation
- 2008-04-18 DE DE602008005131T patent/DE602008005131D1/en active Active
- 2008-04-18 US US12/596,804 patent/US8176866B2/en active Active
- 2008-04-18 BR BRPI0810367-4A patent/BRPI0810367B1/en active IP Right Grant
- 2008-04-18 AU AU2008240391A patent/AU2008240391B2/en active Active
- 2008-04-18 WO PCT/GB2008/050271 patent/WO2008129320A1/en active Application Filing
- 2008-04-18 EP EP08737196A patent/EP2148807B1/en active Active
Patent Citations (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US4417830A (en) * | 1980-02-11 | 1983-11-29 | Constructors John Brown Limited | Connector assembly |
GB2311503A (en) * | 1996-03-28 | 1997-10-01 | Alcatel Kabel Norge As | Anchoring a cable or riser pipe |
WO2001032501A1 (en) * | 1999-11-01 | 2001-05-10 | Offshore Energy Development Corporation | Subsea anchor line connection method and connector for use therein |
EP1283158A1 (en) * | 2001-08-06 | 2003-02-12 | Single Buoy Moorings Inc. | Anchor line installation method and connector for use in said method |
Cited By (7)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US8176866B2 (en) | 2007-04-20 | 2012-05-15 | Acergy Norway As | Methods of and apparatus for mooring and for connecting lines to articles on the seabed |
EP2578488A4 (en) * | 2010-06-07 | 2016-05-04 | Vicinay Cadenas S A | Apparatus for vertically linking two sections of chain |
GB2483701A (en) * | 2010-09-17 | 2012-03-21 | Acergy France Sa | A line handling apparatus for mooring line connection |
GB2483701B (en) * | 2010-09-17 | 2013-02-13 | Acergy France Sa | Improvements in or relating to line-laying operations |
US9422032B2 (en) | 2010-09-17 | 2016-08-23 | Acergy France SAS | Line-laying operations |
WO2014011619A1 (en) * | 2012-07-10 | 2014-01-16 | Chevron U.S.A. Inc. | Apparatus and anchor handling vessels for installing or removing and replacing a segment of a mooring line |
US10760241B2 (en) | 2016-06-16 | 2020-09-01 | Acergy France SAS | Upgrading subsea foundations of mooring systems |
Also Published As
Publication number | Publication date |
---|---|
AU2008240391B2 (en) | 2013-05-02 |
EP2148807A1 (en) | 2010-02-03 |
US8176866B2 (en) | 2012-05-15 |
DE602008005131D1 (en) | 2011-04-07 |
BRPI0810367B1 (en) | 2020-01-07 |
ATE499280T1 (en) | 2011-03-15 |
US20100192828A1 (en) | 2010-08-05 |
AU2008240391A1 (en) | 2008-10-30 |
EP2148807B1 (en) | 2011-02-23 |
BRPI0810367A2 (en) | 2016-10-04 |
GB0707673D0 (en) | 2007-05-30 |
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