EP1172518A1 - Unterwassersteigrohr - Google Patents
Unterwassersteigrohr Download PDFInfo
- Publication number
- EP1172518A1 EP1172518A1 EP00401888A EP00401888A EP1172518A1 EP 1172518 A1 EP1172518 A1 EP 1172518A1 EP 00401888 A EP00401888 A EP 00401888A EP 00401888 A EP00401888 A EP 00401888A EP 1172518 A1 EP1172518 A1 EP 1172518A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- riser
- surface support
- seabed
- conduit
- joint
- 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- Withdrawn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
- 238000004519 manufacturing process Methods 0.000 claims abstract description 7
- 238000000034 method Methods 0.000 claims description 10
- 229910000831 Steel Inorganic materials 0.000 claims description 6
- 239000010959 steel Substances 0.000 claims description 6
- 238000009434 installation Methods 0.000 claims description 3
- 238000006073 displacement reaction Methods 0.000 claims 2
- 229930195733 hydrocarbon Natural products 0.000 claims 2
- 150000002430 hydrocarbons Chemical class 0.000 claims 2
- 230000033001 locomotion Effects 0.000 abstract description 7
- 230000003993 interaction Effects 0.000 abstract description 5
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 3
- 238000005452 bending Methods 0.000 description 2
- 230000006835 compression Effects 0.000 description 2
- 238000007906 compression Methods 0.000 description 2
- 238000012423 maintenance Methods 0.000 description 2
- 230000002411 adverse Effects 0.000 description 1
- 230000006378 damage Effects 0.000 description 1
- 238000005553 drilling Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000007667 floating Methods 0.000 description 1
- 238000010348 incorporation Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000009931 pascalization Methods 0.000 description 1
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
- E21B17/00—Drilling rods or pipes; Flexible drill strings; Kellies; Drill collars; Sucker rods; Cables; Casings; Tubings
- E21B17/01—Risers
- E21B17/015—Non-vertical risers, e.g. articulated or catenary-type
Definitions
- the present invention relates to a marine riser, and in particular a steel catenary riser, and to methods of operating such a riser.
- a riser In offshore oil and gas fields, a riser provides a conduit to connect a wellhead on the seabed to a surface support on the surface of the water.
- Catenary risers, and more particularly Steel Catenary Risers, known as SCRs have been considered for deep-water application for a considerable time now.
- the deep environment allows a metallic riser to be sufficiently flexible to accommodate the stress induced by first- and second-order motions of the surface support.
- Risers may be permanent, for production, or temporary, for maintenance or service operations.
- a riser is subject to great pressures and tensions along its length, particularly when used in deep sea applications. These are due to factors such as the high hydrostatic pressures at such depths and the large weights due to its long suspended length. Furthermore, heave motions of the surface support will be transmitted to the point at which the riser first contacts the seabed, herein known as the touchdown point (TDP), and therefore large bottom tensions and compressions can occur.
- TDP touchdown point
- HCR hybrid catenary riser
- flexjoints These devices can be welded between two sections of a pipeline, to allow relative angular rotation (typically up to +/-25 degrees) between two pipe sections.
- Use of some form of flexible joints as part of a riser system is suggested in US-A-5615917. In that case, flexible joints are incorporated at numerous points spaced along the length of the riser to give the riser flexibility.
- the use of many flexible joints along the length of the riser is expensive and unnecessary as the curvature of a riser can be high at the top of the riser and at the touchdown point but the section of the riser between these two points is always relatively straight.
- WO-A-99/05388 mentioned above discusses briefly an alternative arrangement using a flexjoint. This is understood to refer to a drilling or workover application, however, as opposed to a permanent production riser. In this arrangement, again the surface support conventionally must provide motion compensation and/or constant tension, as the flexjoint must not be operated in compression.
- An object of the present invention is to provide better control of the catenary riser at the touchdown point and to limit the stress level of the catenary riser structure in the sag bend, that is the bend at the bottom end of the riser.
- a catenary riser incorporating a device, such as a flexjoint, so as to fix the touchdown point, that is, the point at which the riser first contacts the seabed.
- a device such as a flexjoint
- the incorporation of such a device at the touchdown point is so that dynamic motion of the riser catenary is absorbed by angular excursion of the flexjoint and not by the interaction of the sag bend with the seabed.
- the riser however can still be laid by conventional pipe laying methods such as S-lay or J-lay.
- the joint is kept in tension simply by the positioning of the surface support, the weight of the riser being permanently to one side of the touchdown point.
- a preferred embodiment of the invention uses a second flexjoint to couple the surface support and the top of the riser.
- the role of this flexjoint is to absorb the bending moment generated at the top by the surface support.
- the expense of numerous intermediate joints is avoided, in any case, as is the expense associated with flexible conduit.
- Fig. 1 shows the path of a catenary riser 1 before (A) and after (B) an excursion 2 of the surface support 3.
- the catenary riser made of welded steel tubular sections, is coupled to the surface support 3 by means of a top flexjoint 4.
- Surface Support 3 is, for example, a floating production and storage vessel (FSPO).
- the touchdown point 5 that is the point in which the catenary riser 1 first contacts the seabed 6, is uncontrolled. Therefore the dynamic motions and excursion 2 of the surface support 3 generates modification of the catenary configuration, resulting in an excursion 7 of the touchdown point 5 itself. This, in turn, results in the undesirable interaction of the sag bend 10 with the seabed 6.
- Fig 2 shows a modified catenary riser 1 wherein at the touchdown point 5 there is incorporated in the catenary riser 1 a bottom flexjoint 8.
- the top of the catenary riser 1 is coupled to the surface support 3 by means of a top flexjoint 4 as in fig 1.
- any dynamic motions or excursion 2 of the surface support 3 are absorbed by the angular excursion 9 of the bottom flexjoint 8 and therefore not absorbed by the interaction of the sag bend 10 with the seabed 6.
- the nominal position of the vessel is set so that the weight of the riser 1 in the catenary shape will keep the flexjoint under tension, over the entire expected range of surface vessel excursions. The excursions that can be accommodated in this way would result in very large and damaging excursions of the touchdown point in a conventional touchdown arrangement.
- the flexjoint 8 can be of known type, permitting bending both up and down and side to side.
- a known form of flexjoint is described in US-A-5615917 mentioned above.
- Other types of flexjoint may of course be used, from suppliers such as Oil States Industries in Arlington, Texas, USA, alternatively Techlam in France.
- the flexjoints 4 and 8 at the top and bottom of the riser are adapted to the different combinations of pressure and axial load encountered at these locations. The bulk and mass of the flexjoints are not an issue in the present case, as they are supported by the seabed and the surface vessel respectively.
Landscapes
- Engineering & Computer Science (AREA)
- Life Sciences & Earth Sciences (AREA)
- Geology (AREA)
- Mining & Mineral Resources (AREA)
- Mechanical Engineering (AREA)
- Physics & Mathematics (AREA)
- Environmental & Geological Engineering (AREA)
- Fluid Mechanics (AREA)
- General Life Sciences & Earth Sciences (AREA)
- Geochemistry & Mineralogy (AREA)
- Earth Drilling (AREA)
Priority Applications (3)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
EP00401888A EP1172518A1 (de) | 2000-06-30 | 2000-06-30 | Unterwassersteigrohr |
BR0102601-1A BR0102601A (pt) | 2000-06-30 | 2001-06-28 | Tubo ascendente marinho |
US09/894,822 US20020054789A1 (en) | 2000-06-30 | 2001-06-28 | Marine riser |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
EP00401888A EP1172518A1 (de) | 2000-06-30 | 2000-06-30 | Unterwassersteigrohr |
Publications (1)
Publication Number | Publication Date |
---|---|
EP1172518A1 true EP1172518A1 (de) | 2002-01-16 |
Family
ID=8173748
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP00401888A Withdrawn EP1172518A1 (de) | 2000-06-30 | 2000-06-30 | Unterwassersteigrohr |
Country Status (3)
Country | Link |
---|---|
US (1) | US20020054789A1 (de) |
EP (1) | EP1172518A1 (de) |
BR (1) | BR0102601A (de) |
Cited By (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
WO2003033856A1 (en) * | 2001-10-19 | 2003-04-24 | Inocean As | Riser for connection between a vessel and a point at the seabed |
WO2008151660A1 (en) * | 2007-06-11 | 2008-12-18 | Vestas Wind Systems A/S | A tubing arrangement for an offshore facility |
US8123437B2 (en) | 2005-10-07 | 2012-02-28 | Heerema Marine Contractors Nederland B.V. | Pipeline assembly comprising an anchoring device |
Families Citing this family (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US7744312B2 (en) * | 2006-11-10 | 2010-06-29 | Single Buoy Moorings, Inc. | Offshore pipe string system and method |
AU2012252921B2 (en) * | 2011-05-06 | 2016-09-15 | National Oilwell Varco Denmark I/S | An offshore system |
Citations (10)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US3778854A (en) * | 1971-03-16 | 1973-12-18 | Santa Fe Int Corp | Mooring and oil transfer apparatus |
US3841357A (en) * | 1972-03-10 | 1974-10-15 | Ihc Holland Nv | Piping between a buoy and a stationary conduit |
GB1564755A (en) * | 1977-03-18 | 1980-04-16 | Ryan W J | Marine riser mooring apparatus |
GB2081417A (en) * | 1980-07-31 | 1982-02-17 | Mobil Oil Corp | Flexible pipe |
GB2148842A (en) * | 1983-10-05 | 1985-06-05 | Bechtel Int Corp | J-configured offshore oil production riser |
US5615977A (en) * | 1993-09-07 | 1997-04-01 | Continental Emsco Company | Flexible/rigid riser system |
US5615917A (en) | 1994-11-28 | 1997-04-01 | Trw Vehicle Safety Systems Inc. | Apparatus for use in a vehicle occupant restraint system |
GB2311503A (en) * | 1996-03-28 | 1997-10-01 | Alcatel Kabel Norge As | Anchoring a cable or riser pipe |
US5865566A (en) * | 1997-09-16 | 1999-02-02 | Deep Oil Technology, Incorporated | Catenary riser support |
GB2330157A (en) * | 1997-10-07 | 1999-04-14 | Bluewater Terminal Systems Nv | Riser system for connecting a seabed installation with a floating vessel |
-
2000
- 2000-06-30 EP EP00401888A patent/EP1172518A1/de not_active Withdrawn
-
2001
- 2001-06-28 US US09/894,822 patent/US20020054789A1/en not_active Abandoned
- 2001-06-28 BR BR0102601-1A patent/BR0102601A/pt not_active Application Discontinuation
Patent Citations (10)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US3778854A (en) * | 1971-03-16 | 1973-12-18 | Santa Fe Int Corp | Mooring and oil transfer apparatus |
US3841357A (en) * | 1972-03-10 | 1974-10-15 | Ihc Holland Nv | Piping between a buoy and a stationary conduit |
GB1564755A (en) * | 1977-03-18 | 1980-04-16 | Ryan W J | Marine riser mooring apparatus |
GB2081417A (en) * | 1980-07-31 | 1982-02-17 | Mobil Oil Corp | Flexible pipe |
GB2148842A (en) * | 1983-10-05 | 1985-06-05 | Bechtel Int Corp | J-configured offshore oil production riser |
US5615977A (en) * | 1993-09-07 | 1997-04-01 | Continental Emsco Company | Flexible/rigid riser system |
US5615917A (en) | 1994-11-28 | 1997-04-01 | Trw Vehicle Safety Systems Inc. | Apparatus for use in a vehicle occupant restraint system |
GB2311503A (en) * | 1996-03-28 | 1997-10-01 | Alcatel Kabel Norge As | Anchoring a cable or riser pipe |
US5865566A (en) * | 1997-09-16 | 1999-02-02 | Deep Oil Technology, Incorporated | Catenary riser support |
GB2330157A (en) * | 1997-10-07 | 1999-04-14 | Bluewater Terminal Systems Nv | Riser system for connecting a seabed installation with a floating vessel |
Cited By (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US7712539B2 (en) | 2001-10-09 | 2010-05-11 | Kjelland-Fosterud Einar | Riser for connection between a vessel and a point at the seabed |
WO2003033856A1 (en) * | 2001-10-19 | 2003-04-24 | Inocean As | Riser for connection between a vessel and a point at the seabed |
US8123437B2 (en) | 2005-10-07 | 2012-02-28 | Heerema Marine Contractors Nederland B.V. | Pipeline assembly comprising an anchoring device |
WO2008151660A1 (en) * | 2007-06-11 | 2008-12-18 | Vestas Wind Systems A/S | A tubing arrangement for an offshore facility |
Also Published As
Publication number | Publication date |
---|---|
US20020054789A1 (en) | 2002-05-09 |
BR0102601A (pt) | 2002-07-23 |
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Legal Events
Date | Code | Title | Description |
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PUAI | Public reference made under article 153(3) epc to a published international application that has entered the european phase |
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AK | Designated contracting states |
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AKX | Designation fees paid | ||
REG | Reference to a national code |
Ref country code: DE Ref legal event code: 8566 |
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STAA | Information on the status of an ep patent application or granted ep patent |
Free format text: STATUS: THE APPLICATION IS DEEMED TO BE WITHDRAWN |
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18D | Application deemed to be withdrawn |
Effective date: 20020718 |