EP2236737A2 - Riser support system - Google Patents
Riser support system Download PDFInfo
- Publication number
- EP2236737A2 EP2236737A2 EP09177552A EP09177552A EP2236737A2 EP 2236737 A2 EP2236737 A2 EP 2236737A2 EP 09177552 A EP09177552 A EP 09177552A EP 09177552 A EP09177552 A EP 09177552A EP 2236737 A2 EP2236737 A2 EP 2236737A2
- Authority
- EP
- European Patent Office
- Prior art keywords
- riser
- seabed
- mid depth
- support
- mid
- 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- Withdrawn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
- 229910000831 Steel Inorganic materials 0.000 claims description 6
- 239000010959 steel Substances 0.000 claims description 6
- 238000007665 sagging Methods 0.000 claims 1
- 230000003068 static effect Effects 0.000 abstract description 8
- 230000033001 locomotion Effects 0.000 abstract description 7
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 10
- 230000007613 environmental effect Effects 0.000 description 4
- 238000006073 displacement reaction Methods 0.000 description 1
- JTJMJGYZQZDUJJ-UHFFFAOYSA-N phencyclidine Chemical class C1CCCCN1C1(C=2C=CC=CC=2)CCCCC1 JTJMJGYZQZDUJJ-UHFFFAOYSA-N 0.000 description 1
- 239000002436 steel type Substances 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
-
- 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
- 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
Definitions
- the present invention relates to a riser system for offshore oil and gas production, and more particularly relates to a riser system suitable for offshore oil and gas production situated in a shallow water.
- Riser systems are used in offshore oil and gas production for communicating systems located on the seabed with floating facilities.
- Dynamic riser systems are required to accommodate static and dynamic offsets and motions of a floating facility. This can become a challenging task in a shallow water especially when the floating facility such as a vessel is subject to rough weather conditions such as storms, typhoons, cyclones that will affect the riser system.
- the present invention provides a riser system well suited to use in offshore oil and gas production located in a shallow water with large static and dynamic floating facility offsets and motions.
- the riser system comprising::
- the riser system has advantages in being able to accommodate floating facility static and dynamic offsets and motions which can become challenging.
- the mid depth buoyant support may include an axial, horizontal and vertical restraint with suitable over curvature protection.
- the mid depth tower comprises of rigid steel like structure offering full translational and rotational restraint for the riser and the termination of which is placed in a vertical and horizontal position, with correctly selected lengths of riser so as to offer compliance for the riser section connected to it.
- the mid depth tower termination end of the riser may comprise of a rigid steel pipeline connection to a dynamic riser.
- the mid depth tower termination end of the riser may comprise a continuos dynamic section of riser, laterally constrained all the way to the seabed and then continuing along the seabed to connect to seabed infrastructure.
- Objects of the present invention include a configuration of a riser that is compliant to large vessel horizontal offsets, large dynamic motions of the floating system, large environmental conditions and large changes to the mass per unit length of the riser (both through internal contents density variations and marine growth).
- Figure 1 shows a riser system of a preferred embodiment according to the present invention.
- the riser system has a hybrid support system comprising a mid depth tower and a mid depth buoyant support.
- the riser system includes at least one riser.
- a plurality of riser may be provided to the riser system.
- the riser for example may be arranged horizontally offset in the direction normal to the plane of the drawing.
- the riser is in the form flexible tube having an upper termination point.
- the upper termination 10 of the riser comprises for example a connection to a dynamic floating facility such as a vessel.
- the connection point of the dynamic floating facility can be arranged at a location above or below the water line 12.
- Portions denoted with reference numeral 1 and 2 define an upper catenary of the riser.
- the riser are configured as such that there is a sag or lower point in this upper catenary (when the floating facility is at its nominal central position).
- the purpose of the catenary configuration is to offer some compliance for the riser system such that it is not damaged when accommodating the static and dynamic motions of the floating facility or the environmental conditions.
- the floating facility is subject to the rough forces of the water i.e. sea waves and currents.
- the upper catenary of the riser is laid over the mid depth buoyant support 4 of the hybrid support system.
- the support there may or may-not be provided some local axial restraint for the riser and there may or may-not be provided some vertical restraint with suitable over curvature protection.
- the mid depth buoyant structure is substantially disposed in a vertical position at a suitable location in a water column that is not necessarily at the exact middle depth, but will not be at the extreme top or bottom of the water depth.
- the mid depth buoyant support provides a vertical support system for the portions of the riser laid over either side of it.
- the mid depth buoyant support derives its buoyancy force from an enclosed volume of displaced water.
- the mid depth buoyant support is connected to a base connection 3 located on the seabed via tethers 5.
- the portion of the riser configuration attached to the mid depth buoyant support but on the opposite side to the upper catenary is termed the mid span catenary 6 and 7.
- the mid span catenary consisting of both components 6 and 7 offers superior horizontal compliance to what would be offered by a configuration with only say component 6 extending straight down to the seabed, either by a tangential or a normal connection to the seabed.
- the mid span catenary is configured such that in the nominal benign condition it has a lower sag between 6 and 7.
- the mid depth tower 8 which is a rigid structure offering complete rotational and translational restraint for the riser system.
- the tower 8 maybe made from a steel type rigid structure.
- the riser can be terminated at 14 to a rigid static steel pipeline termination or it may extend as a static flowline down to the seabed.
- the rigid steel static flowline option is shown in Figure 1 as 9 whereby it extends down to the seabed 11 and then connects to seabed infrastructure 13.
- the purpose of the tower 8 is to provide complete restraint to the riser whereby large environmental forces, mass per unit length variations of the riser and displacements that the riser undergoes can be restrained.
- the mid depth tower support provides a vertical, horizontal and rotational support system for the lower end termination of the riser.
- the mid depth tower does not necessarily need to be at exactly the middle depth of the water column but it is placed at a depth such that in the nominal position riser portion 7 offers some horizontal compliance.
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- 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)
Abstract
Description
- The present invention relates to a riser system for offshore oil and gas production, and more particularly relates to a riser system suitable for offshore oil and gas production situated in a shallow water.
- Riser systems are used in offshore oil and gas production for communicating systems located on the seabed with floating facilities.
- Dynamic riser systems are required to accommodate static and dynamic offsets and motions of a floating facility. This can become a challenging task in a shallow water especially when the floating facility such as a vessel is subject to rough weather conditions such as storms, typhoons, cyclones that will affect the riser system.
- It is an aim of the present invention to provide a riser system which could alleviate the above disadvantages.
- The present invention provides a riser system well suited to use in offshore oil and gas production located in a shallow water with large static and dynamic floating facility offsets and motions.
- The riser system comprising::
- i) A hybrid support system comprising a mid depth tower and a mid depth buoyant support.
- ii) The mid depth tower of the hybrid support system provides a termination point for a dynamic portion of a riser wherein the tower is fully restrained.
- iii) The mid depth buoyant support of the hybrid support system provides a vertical support for the dynamic riser along the span away from the mid depth tower end while also offering some compliance in the horizontal direction. The mid depth buoyant support consists of an enclosed volume of displaced water tethered to the seabed.
- The riser system has advantages in being able to accommodate floating facility static and dynamic offsets and motions which can become challenging. The mid depth buoyant support may include an axial, horizontal and vertical restraint with suitable over curvature protection.
- The mid depth tower comprises of rigid steel like structure offering full translational and rotational restraint for the riser and the termination of which is placed in a vertical and horizontal position, with correctly selected lengths of riser so as to offer compliance for the riser section connected to it.
- The mid depth tower termination end of the riser may comprise of a rigid steel pipeline connection to a dynamic riser. The mid depth tower termination end of the riser may comprise a continuos dynamic section of riser, laterally constrained all the way to the seabed and then continuing along the seabed to connect to seabed infrastructure.
- Objects of the present invention include a configuration of a riser that is compliant to large vessel horizontal offsets, large dynamic motions of the floating system, large environmental conditions and large changes to the mass per unit length of the riser (both through internal contents density variations and marine growth).
-
-
Figure 1 diagrammatically shows a riser system of a preferred embodiment according to the present invention. -
Figure 1 shows a riser system of a preferred embodiment according to the present invention. The riser system has a hybrid support system comprising a mid depth tower and a mid depth buoyant support. - As illustrated, the riser system includes at least one riser. A plurality of riser may be provided to the riser system. The riser, for example may be arranged horizontally offset in the direction normal to the plane of the drawing.
- The riser is in the form flexible tube having an upper termination point. The
upper termination 10 of the riser comprises for example a connection to a dynamic floating facility such as a vessel. The connection point of the dynamic floating facility can be arranged at a location above or below thewater line 12. - Portions denoted with reference numeral 1 and 2 define an upper catenary of the riser. The riser are configured as such that there is a sag or lower point in this upper catenary (when the floating facility is at its nominal central position). The purpose of the catenary configuration is to offer some compliance for the riser system such that it is not damaged when accommodating the static and dynamic motions of the floating facility or the environmental conditions. The floating facility is subject to the rough forces of the water i.e. sea waves and currents.
- The upper catenary of the riser is laid over the mid depth buoyant support 4 of the hybrid support system. The support there may or may-not be provided some local axial restraint for the riser and there may or may-not be provided some vertical restraint with suitable over curvature protection. The mid depth buoyant structure is substantially disposed in a vertical position at a suitable location in a water column that is not necessarily at the exact middle depth, but will not be at the extreme top or bottom of the water depth. The mid depth buoyant support provides a vertical support system for the portions of the riser laid over either side of it. The mid depth buoyant support derives its buoyancy force from an enclosed volume of displaced water. The mid depth buoyant support is connected to a base connection 3 located on the seabed via tethers 5. This connection allows the mid depth buoyant support to move in any directions restricted by the length of the tethers. By its nature the mid depth buoyancy support can undergo upside down pendulum type motions when forced to do so by either direct environmental forces or by the riser system forcing it to do so.
- The portion of the riser configuration attached to the mid depth buoyant support but on the opposite side to the upper catenary is termed the mid span catenary 6 and 7. The mid span catenary consisting of both components 6 and 7 offers superior horizontal compliance to what would be offered by a configuration with only say component 6 extending straight down to the seabed, either by a tangential or a normal connection to the seabed. The mid span catenary is configured such that in the nominal benign condition it has a lower sag between 6 and 7.
- Riser portion 7 extends in the opposite direction to 6 is connected to the component of the hybrid support system termed the mid depth tower 8 which is a rigid structure offering complete rotational and translational restraint for the riser system. The tower 8 maybe made from a steel type rigid structure. The riser can be terminated at 14 to a rigid static steel pipeline termination or it may extend as a static flowline down to the seabed. The rigid steel static flowline option is shown in
Figure 1 as 9 whereby it extends down to theseabed 11 and then connects to seabed infrastructure 13. The purpose of the tower 8 is to provide complete restraint to the riser whereby large environmental forces, mass per unit length variations of the riser and displacements that the riser undergoes can be restrained. The mid depth tower support provides a vertical, horizontal and rotational support system for the lower end termination of the riser. The mid depth tower does not necessarily need to be at exactly the middle depth of the water column but it is placed at a depth such that in the nominal position riser portion 7 offers some horizontal compliance.
Claims (6)
- A riser system suitable for offshore oil and gas production for communicating systems on the seabed with floating facilities comprising
a riser extending from the seabed to a floating facility, said riser is supported by a hybrid support system wherein the hybrid supporting system comprises a mid depth tower and a mid depth buoyant support. - A riser system of claim 1 wherein the mid depth buoyant support structure of the hybrid supporting structure comprises buoyant enclosed structure tethered to the seabed arranged to raise and support at a point over a span of the riser for providing a sagging portion of the riser.
- A riser system of claim 1 wherein the mid depth buoyant support of the hybrid support system includes an axial, horizontal and vertical restraint with suitable over curvature protection.
- A riser of claim 1 wherein the mid depth tower of the hybrid support system comprises rigid steel like structure offering full translational and rotational restraint for the riser and the termination of which is placed in a vertical and horizontal position, with correctly selected lengths of riser so as to offer compliance for the riser section connected to it.
- A riser of claim 1 wherein the mid depth tower having a termination end connectable to the riser comprises of a rigid steel pipeline connection of dynamic riser.
- A riser of claim 1 wherein the mid depth tower termination end of the riser comprises a continuos dynamic section of riser, laterally constrained all the way to the seabed and then continuing along the seabed to connect to seabed infrastructure.
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
MYPI20091250 | 2009-03-27 |
Publications (2)
Publication Number | Publication Date |
---|---|
EP2236737A2 true EP2236737A2 (en) | 2010-10-06 |
EP2236737A3 EP2236737A3 (en) | 2014-02-19 |
Family
ID=42225009
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP09177552.8A Withdrawn EP2236737A3 (en) | 2009-03-27 | 2009-11-30 | Riser support system |
Country Status (3)
Country | Link |
---|---|
EP (1) | EP2236737A3 (en) |
CN (1) | CN101845940A (en) |
AU (2) | AU2009243413A1 (en) |
Cited By (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
WO2011150945A1 (en) * | 2010-06-04 | 2011-12-08 | Nkt Flexibles I/S | A flexible pipe system |
WO2012152278A1 (en) * | 2011-05-06 | 2012-11-15 | National Oilwell Varco Denmark I/S | An offshore system |
CN103822019A (en) * | 2014-03-11 | 2014-05-28 | 东北石油大学 | Suspension-in-water conveying pipeline and construction method thereof |
Families Citing this family (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CN102410919A (en) * | 2011-08-02 | 2012-04-11 | 上海交通大学 | Rotating testing device for vortex-induced vibration of movable inclined riser at lower top of shear flow |
CN103906681B (en) * | 2011-11-03 | 2016-10-05 | 国际壳牌研究有限公司 | Fluid-conveying hose executor and the method for conveying fluid |
FR2983233B1 (en) * | 2011-11-30 | 2016-01-01 | Saipem Sa | INSTALLATION OF MULTI-FLEXIBLE FUND-SURFACE LINKS ON AT LEAST TWO LEVELS |
US9797526B2 (en) * | 2015-09-16 | 2017-10-24 | Ge Oil & Gas Uk Limited | Riser assembly and method of installing a riser assembly |
Citations (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US5505560A (en) * | 1993-10-26 | 1996-04-09 | Offshore Energie Development Corporation (Oecd) | Fluid transfer system for an offshore moored floating unit |
WO2010030160A1 (en) * | 2008-09-09 | 2010-03-18 | Misc Berhad | A offshore seabed to surface conduit transfer system |
Family Cites Families (7)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US5615977A (en) * | 1993-09-07 | 1997-04-01 | Continental Emsco Company | Flexible/rigid riser system |
NO306826B1 (en) * | 1998-06-12 | 1999-12-27 | Norske Stats Oljeselskap | Device by riser |
FR2790054B1 (en) * | 1999-02-19 | 2001-05-25 | Bouygues Offshore | METHOD AND DEVICE FOR LOW-SURFACE LINKAGE BY SUBMARINE PIPELINE INSTALLED WITH LARGE DEPTH |
US7434624B2 (en) * | 2002-10-03 | 2008-10-14 | Exxonmobil Upstream Research Company | Hybrid tension-leg riser |
CN2727043Y (en) * | 2004-01-20 | 2005-09-21 | 天津市海王星海上工程技术有限公司 | Deep water tension leg type single point mooring device |
GB0409361D0 (en) * | 2004-04-27 | 2004-06-02 | Stolt Offshore Sa | Marine riser tower |
FR2888305B1 (en) * | 2005-07-11 | 2008-12-12 | Technip France Sa | METHOD AND INSTALLATION FOR CONNECTING A RIGID UNDERWATER DRIVE AND A FLEXIBLE SUBMARINE CONDUCT |
-
2009
- 2009-11-27 AU AU2009243413A patent/AU2009243413A1/en not_active Abandoned
- 2009-11-30 EP EP09177552.8A patent/EP2236737A3/en not_active Withdrawn
- 2009-11-30 CN CN200911000021A patent/CN101845940A/en active Pending
-
2016
- 2016-07-22 AU AU2016206380A patent/AU2016206380A1/en not_active Abandoned
Patent Citations (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US5505560A (en) * | 1993-10-26 | 1996-04-09 | Offshore Energie Development Corporation (Oecd) | Fluid transfer system for an offshore moored floating unit |
WO2010030160A1 (en) * | 2008-09-09 | 2010-03-18 | Misc Berhad | A offshore seabed to surface conduit transfer system |
Cited By (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
WO2011150945A1 (en) * | 2010-06-04 | 2011-12-08 | Nkt Flexibles I/S | A flexible pipe system |
WO2012152278A1 (en) * | 2011-05-06 | 2012-11-15 | National Oilwell Varco Denmark I/S | An offshore system |
US9315245B2 (en) | 2011-05-06 | 2016-04-19 | National Oilwell Varco Denmark I/S | Offshore system |
CN103822019A (en) * | 2014-03-11 | 2014-05-28 | 东北石油大学 | Suspension-in-water conveying pipeline and construction method thereof |
Also Published As
Publication number | Publication date |
---|---|
CN101845940A (en) | 2010-09-29 |
EP2236737A3 (en) | 2014-02-19 |
AU2016206380A1 (en) | 2016-08-11 |
AU2009243413A1 (en) | 2010-10-14 |
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