EP1597141A2 - Riser pipe support system and method - Google Patents
Riser pipe support system and methodInfo
- Publication number
- EP1597141A2 EP1597141A2 EP04715646A EP04715646A EP1597141A2 EP 1597141 A2 EP1597141 A2 EP 1597141A2 EP 04715646 A EP04715646 A EP 04715646A EP 04715646 A EP04715646 A EP 04715646A EP 1597141 A2 EP1597141 A2 EP 1597141A2
- Authority
- EP
- European Patent Office
- Prior art keywords
- vessel
- keel
- riser
- hull
- risers
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Withdrawn
Links
Classifications
-
- E—FIXED CONSTRUCTIONS
- E21—EARTH DRILLING; MINING
- E21B—EARTH DRILLING, e.g. DEEP DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B19/00—Handling rods, casings, tubes or the like outside the borehole, e.g. in the derrick; Apparatus for feeding the rods or cables
- E21B19/002—Handling rods, casings, tubes or the like outside the borehole, e.g. in the derrick; Apparatus for feeding the rods or cables specially adapted for underwater drilling
- E21B19/004—Handling rods, casings, tubes or the like outside the borehole, e.g. in the derrick; Apparatus for feeding the rods or cables specially adapted for underwater drilling supporting a riser from a drilling or production platform
-
- E—FIXED CONSTRUCTIONS
- E21—EARTH DRILLING; MINING
- E21B—EARTH DRILLING, e.g. DEEP DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B43/00—Methods or apparatus for obtaining oil, gas, water, soluble or meltable materials or a slurry of minerals from wells
- E21B43/01—Methods or apparatus for obtaining oil, gas, water, soluble or meltable materials or a slurry of minerals from wells specially adapted for obtaining from underwater installations
-
- E—FIXED CONSTRUCTIONS
- E21—EARTH DRILLING; MINING
- E21B—EARTH DRILLING, e.g. DEEP DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B43/00—Methods or apparatus for obtaining oil, gas, water, soluble or meltable materials or a slurry of minerals from wells
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B63—SHIPS OR OTHER WATERBORNE VESSELS; RELATED EQUIPMENT
- B63B—SHIPS OR OTHER WATERBORNE VESSELS; EQUIPMENT FOR SHIPPING
- B63B1/00—Hydrodynamic or hydrostatic features of hulls or of hydrofoils
- B63B1/02—Hydrodynamic or hydrostatic features of hulls or of hydrofoils deriving lift mainly from water displacement
- B63B1/10—Hydrodynamic or hydrostatic features of hulls or of hydrofoils deriving lift mainly from water displacement with multiple hulls
- B63B1/107—Semi-submersibles; Small waterline area multiple hull vessels and the like, e.g. SWATH
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B63—SHIPS OR OTHER WATERBORNE VESSELS; RELATED EQUIPMENT
- B63B—SHIPS OR OTHER WATERBORNE VESSELS; EQUIPMENT FOR SHIPPING
- B63B1/00—Hydrodynamic or hydrostatic features of hulls or of hydrofoils
- B63B1/02—Hydrodynamic or hydrostatic features of hulls or of hydrofoils deriving lift mainly from water displacement
- B63B1/10—Hydrodynamic or hydrostatic features of hulls or of hydrofoils deriving lift mainly from water displacement with multiple hulls
- B63B1/12—Hydrodynamic or hydrostatic features of hulls or of hydrofoils deriving lift mainly from water displacement with multiple hulls the hulls being interconnected rigidly
- B63B2001/128—Hydrodynamic or hydrostatic features of hulls or of hydrofoils deriving lift mainly from water displacement with multiple hulls the hulls being interconnected rigidly comprising underwater connectors between the hulls
-
- 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
- B63B21/50—Anchoring arrangements or methods for special vessels, e.g. for floating drilling platforms or dredgers
- B63B21/502—Anchoring arrangements or methods for special vessels, e.g. for floating drilling platforms or dredgers by means of tension legs
Definitions
- the present invention relates generally to offshore hydrocarbon production and more particularly to fixing a keel guide on the submerged perimeter of the hull of a tension leg platform or other floating offshore vessel to laterally support a riser or umbilical extending vertically or near vertically from the seabed.
- a riser pipe is used to connect a subsea wellhead structure at the sea floor with the hydrocarbon processing system located on a floating platform maintained in position above the wellhead.
- the lower ends of the risers are connected to the sea floor by structures embedded in the sea floor and grouted or cemented thereto.
- a floating structure such as a tension leg platform (TLP) or a semi-submersible platform
- TLP tension leg platform
- the riser is typically suspended from the floating vessel using a support platform.
- a typical TLP (10) consists of one or more decks (20) with equipment for production and processing of hyrdocarbons.
- the deck (20) is supported by a hull (18), which is submerged or partially submerged and which provides the buoyant force for the platform.
- the hull (18) provides attachment points ⁇ 19) for tendons (12) anchored to the seabed (11).
- the hull (18) may comprise one or more submerged pontoons, often positioned to form a horizontal triangle, square or circle, or as illustrated in Figures 1 and 2, a cruciform structure.
- One or more vertical columns (22) extend from the hull (18) upwards through the water's surface and attach to the deck (20).
- Risers (14) or umbilicals extend from subsea wells (40) to the platform (10).
- the risers (14) are traditionally vertically suspended and laterally supported below the water's surface by a structure (16) attached to the platform (10).
- Risers are traditionally spaced apart from the hull to minimize impact with the hull caused by environmental forces and to allow easier termination of the risers.
- Figures 1-2 disclose a moored TLP of prior art with risers (14) vertically suspended and laterally supported under water by a truss extending outboard from the hull.
- FIGS. 3 and 4 show a prior art TLP (10) moored by tendons (12) connected to the hull (18) at attachment points (19).
- the TLP (10) has columns (22) supporting a superstructure with decks (20).
- this TLP hull (18) is configured with pontoons forming a square within a cruciform shape.
- a rectangular array of risers (14) passes through the center of the platform (10), suspended below the water's surface and laterally braced interiorly away from the hull by a grid-like network of struts (16).
- U.S. 6,273,018 shows a buoyant offshore platform using a similar arrangement of risers passing through the center of the platform and supported by trusses.
- Floating offshore vessels have structures which extend well below the surface of the water and which are subjected to environmental forces resulting in movement of the platform. Both the upper and lower ends of the risers are affected by movement of a floating platform.
- Forces acting on a floating vessel and riser pipe system include forces resulting from heave, pitch, roll, sway or surge, height and period of waves and swells, currents, specific gravity of fluid conducted within the riser, buoyancy means attached to the riser, current profile, offset of the platform from the well, tension at the top of the riser, the stiffness of the riser, and the riser's vertical disposition.
- riser stroke is also a function of platform design. Locating risers close to the hull reduces potential riser stroke, while locating risers further away from the hull increases potential riser stroke. To compensate for riser stroke, the upper ends of risers are connected to the platform by relatively complex riser tensioning systems which permit the platform to move relative to the riser and at the same time maintain a desired tension on the riser. It is advantageous to place risers close to the vessel hull to provide increased and simplified lateral support to the risers or umbilicals without an extensive network of struts.
- the primary object of the invention is provide a floating platform designed to have risers or umbilicals that are vertically or near vertically suspended above the keel of the floating platform and that are laterally supported by keel guides positioned along the perimeter of the platform's hull at an elevation at or near the keel.
- Another object of the invention is to provide lateral support to risers or umbilicals at a vertical elevation at or near the keel or the vertical elevation of the hull attachment poinst for mooring tendons.
- Another object of the invention is to provide increased riser structural support, with a lateral support structure integral to or rigidly connected with the hull.
- Another object of the invention is to provide a method to reduce the impact of wave action on the risers or umbilicals in the wave zone, minimizing riser/hull clashing and increasing riser fatigue life while allowing the risers to be arranged vertically or near vertically close to the hull.
- a floating offshore system such as a TLP or semi- submersible platform, which mates with risers or umbilicals extending vertically or near vertically from the ocean floor.
- the risers are suspended vertically from above the keel (and usually, but not necessarily, above the water's surface) and are supported laterally at or near the hull by keel guides positioned along the submerged perimeter of the platform's hull, or within the hull by production riser slots.
- the keel guides or production riser slots are designed and arranged to receive a keel joint which provides a bearing surface to laterally support the riser while allowing free vertical movement relative to the platform.
- the keel guides may be positioned on outboard-facing hull surfaces, inboard-facing hull surfaces, or within a moonpool.
- Figure 1 illustrates a side view of a moored TLP of prior art having risers suspended under water from truss extending outboard from the hull;
- Figure 2 is a cross section taken along lines 2-2 of Figure 1 ;
- Figure 3 illustrates a side view of a moored TLP of prior art having risers suspended under water using a grid network attached to the interior sides of the TLP pontoons;
- FIG. 4 is a cross section taken along lines 4-4 of Figure 3;
- Figure 5 is side view of a moored TLP according to the invention having risers vertically suspended from above the waterline and laterally supported below the waterline adjacent to and outboard of the TLP hull using keel guides;
- Figure 6 is a cross section talcen along lines 6-6 of Figure 5 showing risers laterally supported near the keel using keel guides attached to the outboard hull surfaces according to the invention;
- Figure 7 is an enlarged side view of a portion of Figure 5 showing detail of the keel guides
- Figure 8 is a perspective view of an open frame side-entry keel guide according to the invention
- Figure 9 is a cross section of a typical keel joint or prior art
- Figure 10 is a vertical cross section of a TLP according to the invention showing a riser tensioner located on a platform deck;
- Figure 11 is a horizontal cross section of a TLP according to the invention having risers laterally supported near the keel using keel guides attached to the inboard pontoon surfaces;
- Figure 12 is a horizontal cross section of a TLP according to the invention having a moonpool with keel guides disposed therein; and Figure 13 is a horizontal cross section of a TLP according to the invention having riser production slots in the bottom of the TLP hull. DESCRIPTION OF THE PREFERRED EMBODIMENT OF THE INVENTION
- this invention concerns a floating offshore system, such as a TLP or semi-submersible platform, hereinafter referred to simply as platform 10.
- the platform consists of one or more decks 20 with equipment for production and processing of hyrdocarbons, drilling, and workover.
- the deck 20 provides utility, safety, and supporting structures for human use.
- the deck 20 is supported by a hull 18 which is submerged or partially submerged and which provides the buoyant force for the platform.
- the hull 18 provides attachment points 19 for tendons 12 or other means of mooring.
- the hull 18 may include one or more submerged pontoons, often positioned to form a horizontal triangle, square, circle, or cruciform-shaped structure.
- One or more vertical columns 22 extend from the hull 18 upwards through the water's surface and attach to the deck 20.
- the platform 10 mates with one or more risers 14 or umbilicals extending vertically or near vertically from the ocean floor 11.
- the risers 14 are used for drilling, production, export, or injection of water, gas or chemicals.
- the risers 14 according to the invention are vertically suspended above the keel 26, preferably from the deck 20.
- the platform 10 includes keel guides 7, also known as keel joint receptacles or support receptacles, which are positioned along the exterior submerged perimeter of the hull 18 and which simply provide lateral support to the risers 14.
- keel guides 7 may be positioned at an elevated position on the hull 18, the keel guides 7 are preferably located at or near the vertical elevation of the keel 26 and/or the vertical elevation of the hull tendon attachment points (tendon porches). It is desirable, particularly in the case of TLPs, for the vertical elevation of the keel guides 7 to be kept at or close to that of the tendon porches so that the top of the risers at the keel guide level moves in parallel with the top of the tendons.
- Each riser 14 is equipped with a keel joint assembly 8 which is received into a keel guide 7.
- the keel joint 8 provides a bearing surface for riser 14, allowing the riser to freely move along its vertical axis within the keel guide 7 while being supported laterally.
- Figure 7 is an enlarged view of the six keel guides illustrated in Figure 5 which provides greater detail of the structure of the keel guides but which slows only one riser 14 and keel joint 8.
- Keel guide 7 is a structure integral with the hull 18 or designed and arranged for rigid mounting to the vessel hull 18. Keel guide 7 is designed to receive particular riser keel joint 8. The keel guide 7 provides lateral support to a keel joint 8 and riser 14 ithin it. A keel guide can be of a slotted design 7A for side entry of the riser pipe or closed design 7B for vertical riser entry. A perspective sketch of a typical open frame side entry keel guide structure is shown in Figure 8. Keel joints are known in the art, and Figure 9 illustrates detail of an ordinary keel joint 8 of prior art. Riser 14 is fitted with a keel joint outer casing 60 and elastomeric bearings 62.
- FIG. 10 illustrates a production riser system according to the invention.
- Riser 14 is shown connected to a subsea wellhead 40 at the ocean floor 11.
- the riser 14 is tensioned from deck 20 by a passive spring riser tensioner 42.
- the tensioner 42 is located on the cellar deck of platform 10.
- Riser 14 is laterally supported by a keel guide 7 attached to the platform hull 18 and keel joint 8 which is received in the keel guide 7.
- the riser 14 terminates at a tubing head 44 and surface tree 46, with an injection umbilical 48 and a production umbilical 50 extending therefrom.
- keel guides may be placed anywhere along the hull 18 perimeter, including both outboard exterior surfaces 30 as illustrated in Figure 6, and inboard exterior surfaces 32 as illustrated in Figure 11.
- Figure 11 is a horizontal cross section of a TLP with a hull 18 formed by a ring shaped pontoon.
- Keel guides 7 are attached directly to the hull on the inboard surfaces 32 for laterally supporting risers 14.
- keel guides can simultaneously exist on both inboard surfaces 32 and outboard surfaces 30.
- the hull 18 may include one or more moonpools 24.
- a moonpool is an opening in or near the center of the hull 18 or a closure of some space around the hull 18 that is used to route and protect the risers 14, among other functions.
- An open moonpool is one whose top and bottom are perforated to allow the routing of risers, and whose bottom and top are both below the water's surface.
- a closed moonpool on the other hand, has a bottom located below the waterline and a top located above the waterline.
- Keel guides 7 may also be positioned within an either an open moonpool or a closed moonpool.
- the present invention provides an alternate structure for laterally supporting a riser.
- Production riser slots or hawser pipe penetrations 6, positioned in the hull as shown in Figure 13, may be used.
- the risers may be vertically supported by a tensioner located on deck 20, and keel joints are designed and arranged to fit within the production riser slots 6.
- this invention is best suited for support of risers during platform operation, it may be used for temporary support of the risers as well.
Abstract
Description
Claims
Applications Claiming Priority (3)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US45138003P | 2003-02-28 | 2003-02-28 | |
US451380P | 2003-02-28 | ||
PCT/US2004/005892 WO2004077951A2 (en) | 2003-02-28 | 2004-02-27 | Riser pipe support system and method |
Publications (1)
Publication Number | Publication Date |
---|---|
EP1597141A2 true EP1597141A2 (en) | 2005-11-23 |
Family
ID=32962587
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP04715646A Withdrawn EP1597141A2 (en) | 2003-02-28 | 2004-02-27 | Riser pipe support system and method |
Country Status (9)
Country | Link |
---|---|
US (1) | US20040182297A1 (en) |
EP (1) | EP1597141A2 (en) |
JP (1) | JP2006519137A (en) |
KR (1) | KR20050109516A (en) |
CN (1) | CN1777532A (en) |
AU (1) | AU2004218479A1 (en) |
BR (1) | BRPI0408048A (en) |
CA (1) | CA2517365A1 (en) |
WO (1) | WO2004077951A2 (en) |
Families Citing this family (19)
Publication number | Priority date | Publication date | Assignee | Title |
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WO2005100737A1 (en) * | 2004-04-16 | 2005-10-27 | Vetco Aibel As | System and method for rigging up well workover equipment |
US7669660B1 (en) * | 2008-11-26 | 2010-03-02 | Floatec, Llc | Riser disconnect and support mechanism |
CN102030085B (en) * | 2009-09-30 | 2013-05-08 | 天津市海王星海上工程技术有限公司 | Novel floating production oil storage platform structure |
US20110206466A1 (en) * | 2010-02-25 | 2011-08-25 | Modec International, Inc. | Tension Leg Platform With Improved Hydrodynamic Performance |
JP5665024B2 (en) * | 2010-07-02 | 2015-02-04 | 独立行政法人海上技術安全研究所 | Riser tube suspension device and mooring tube coupling device |
US8757082B2 (en) * | 2011-07-01 | 2014-06-24 | Seahorse Equipment Corp | Offshore platform with outset columns |
US9109404B2 (en) * | 2011-10-17 | 2015-08-18 | Cameron International Corporation | Riser string hang-off assembly |
US9352808B2 (en) * | 2012-01-16 | 2016-05-31 | Seahorse Equipment Corp | Offshore platform having SCR porches mounted on riser keel guide |
CN105283380B (en) * | 2013-04-15 | 2017-09-22 | 海马设备公司 | Riser tensioners conductor for dry tree semi-submersible |
NO335480B1 (en) * | 2013-04-16 | 2014-12-15 | Gva Consultants Ab | pipeline Suspension |
WO2015126811A1 (en) * | 2014-02-19 | 2015-08-27 | Conocophillips Company | Tension leg platform (tlp) having offset top tension riser (ttr) guides |
US20150298775A1 (en) * | 2014-04-17 | 2015-10-22 | Floatec, Llc | Low Heave Semi-Submersible Offshore Structure |
WO2015168432A1 (en) * | 2014-04-30 | 2015-11-05 | Seahorse Equipment Corp | Bundled, articulated riser system for fpso vessel |
JP2016117363A (en) * | 2014-12-19 | 2016-06-30 | 三井造船株式会社 | Fairing cover |
US9718518B2 (en) * | 2015-02-06 | 2017-08-01 | Exmar Offshore Company | Methods for connecting to floating structures |
JP2017052469A (en) | 2015-09-11 | 2017-03-16 | 三井造船株式会社 | Floating installation provided with riser support structure |
CN108049558A (en) * | 2017-12-30 | 2018-05-18 | 浙江亚厦装饰股份有限公司 | The installation method of furred ceiling, furred ceiling assembly and furred ceiling |
CN111634369B (en) * | 2020-05-29 | 2022-03-18 | 中国船舶工业集团公司第七0八研究所 | Outboard protective pipe structure of FPSO anchor chain detection system |
BR102020020314A2 (en) * | 2020-10-02 | 2022-04-19 | Petróleo Brasileiro S.A. - Petrobras | Multipurpose riser balcony (polyvalent riser balcony) |
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US3648638A (en) * | 1970-03-09 | 1972-03-14 | Amoco Prod Co | Vertically moored platforms |
US3780685A (en) * | 1971-04-09 | 1973-12-25 | Deep Oil Technology Inc | Tension leg offshore marine apparatus |
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US6386798B2 (en) * | 1999-03-30 | 2002-05-14 | Deep Oil Technology Incorporated | Universal catenary riser support |
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US6431284B1 (en) * | 2000-10-03 | 2002-08-13 | Cso Aker Maritime, Inc. | Gimbaled table riser support system |
US6648074B2 (en) * | 2000-10-03 | 2003-11-18 | Coflexip S.A. | Gimbaled table riser support system |
US6688250B2 (en) * | 2001-08-06 | 2004-02-10 | Seahorse Equipment Corporation | Method and apparatus for reducing tension variations in mono-column TLP systems |
-
2004
- 2004-02-27 CA CA002517365A patent/CA2517365A1/en not_active Abandoned
- 2004-02-27 KR KR1020057016124A patent/KR20050109516A/en not_active Application Discontinuation
- 2004-02-27 BR BRPI0408048-3A patent/BRPI0408048A/en not_active IP Right Cessation
- 2004-02-27 CN CNA2004800110275A patent/CN1777532A/en active Pending
- 2004-02-27 EP EP04715646A patent/EP1597141A2/en not_active Withdrawn
- 2004-02-27 JP JP2006508876A patent/JP2006519137A/en active Pending
- 2004-02-27 AU AU2004218479A patent/AU2004218479A1/en not_active Abandoned
- 2004-02-27 WO PCT/US2004/005892 patent/WO2004077951A2/en active Application Filing
- 2004-02-27 US US10/788,771 patent/US20040182297A1/en not_active Abandoned
Non-Patent Citations (1)
Title |
---|
See references of WO2004077951A2 * |
Also Published As
Publication number | Publication date |
---|---|
AU2004218479A1 (en) | 2004-09-16 |
JP2006519137A (en) | 2006-08-24 |
WO2004077951B1 (en) | 2005-08-04 |
CA2517365A1 (en) | 2004-09-16 |
BRPI0408048A (en) | 2006-02-14 |
CN1777532A (en) | 2006-05-24 |
WO2004077951A2 (en) | 2004-09-16 |
WO2004077951A3 (en) | 2005-06-16 |
KR20050109516A (en) | 2005-11-21 |
US20040182297A1 (en) | 2004-09-23 |
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Legal Events
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