AU2008225139A1 - Vortex induced vibration suppression systems and methods - Google Patents
Vortex induced vibration suppression systems and methods Download PDFInfo
- Publication number
- AU2008225139A1 AU2008225139A1 AU2008225139A AU2008225139A AU2008225139A1 AU 2008225139 A1 AU2008225139 A1 AU 2008225139A1 AU 2008225139 A AU2008225139 A AU 2008225139A AU 2008225139 A AU2008225139 A AU 2008225139A AU 2008225139 A1 AU2008225139 A1 AU 2008225139A1
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- Australia
- Prior art keywords
- vibration suppression
- subsea structure
- induced vibration
- vortex induced
- line
- Prior art date
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- 230000001629 suppression Effects 0.000 title claims description 43
- 238000000034 method Methods 0.000 title claims description 33
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 31
- 238000009434 installation Methods 0.000 claims description 12
- 125000006850 spacer group Chemical group 0.000 claims description 4
- 210000002435 tendon Anatomy 0.000 claims description 4
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 description 4
- 239000012530 fluid Substances 0.000 description 4
- 229910052802 copper Inorganic materials 0.000 description 3
- 239000010949 copper Substances 0.000 description 3
- 238000005553 drilling Methods 0.000 description 2
- 238000004026 adhesive bonding Methods 0.000 description 1
- 238000004873 anchoring Methods 0.000 description 1
- 238000007796 conventional method Methods 0.000 description 1
- 239000013013 elastic material Substances 0.000 description 1
- 238000005188 flotation Methods 0.000 description 1
- 229930195733 hydrocarbon Natural products 0.000 description 1
- 150000002430 hydrocarbons Chemical class 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000012552 review Methods 0.000 description 1
- 230000006641 stabilisation Effects 0.000 description 1
- 238000011105 stabilization Methods 0.000 description 1
- 238000012546 transfer Methods 0.000 description 1
- 238000003466 welding Methods 0.000 description 1
Classifications
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- 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
-
- 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
-
- 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
- E21B17/012—Risers with buoyancy elements
-
- 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
- E21B41/00—Equipment or details not covered by groups E21B15/00 - E21B40/00
- E21B41/04—Manipulators for underwater operations, e.g. temporarily connected to well heads
-
- 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
- B63B2021/504—Anchoring arrangements or methods for special vessels, e.g. for floating drilling platforms or dredgers by means of tension legs comprising suppressors for vortex induced vibrations
Landscapes
- Engineering & Computer Science (AREA)
- Geology (AREA)
- Mining & Mineral Resources (AREA)
- Life Sciences & Earth Sciences (AREA)
- General Life Sciences & Earth Sciences (AREA)
- Fluid Mechanics (AREA)
- Environmental & Geological Engineering (AREA)
- Physics & Mathematics (AREA)
- Mechanical Engineering (AREA)
- Geochemistry & Mineralogy (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Ocean & Marine Engineering (AREA)
- Earth Drilling (AREA)
- Accessories Of Cameras (AREA)
- Apparatuses For Generation Of Mechanical Vibrations (AREA)
Description
WO 2008/112758 PCT/US2008/056655 TH3214-PCT 5 VORTEX INDUCED VIBRATION SUPPRESSION SYSTEMS AND METHODS Related Applications This application claims priority to co-pending U.S. Provisional Application 10 60/894,748, filed March 14, 2007, and having attorney docket number TH3214. U.S. Provisional Application 60/894,748 is herein incorporated by reference in its entirety. Field of the Invention 15 This invention is related to vortex induced vibration suppression devices, and to systems and methods for attaching the devices to structures to reduce drag and/or vortex induced vibration (VIV). Background of the Invention 20 Whenever a bluff body in a fluid environment, such as a cylinder, is subjected to a current in the fluid, it is possible for the body to experience vortex induced vibrations (VIV). These vibrations may be caused by oscillating hydrodynamic forces on the surface, which can cause substantial vibrations of the structure, especially if the forcing frequency is at or near a structural natural 25 frequency. Drilling for and/or producing hydrocarbons or the like from subterranean deposits which exist under a body of water exposes underwater drilling and production equipment to water currents and the possibility of VIV. Equipment exposed to VIV may include structures ranging from the tubes of a riser system, 30 anchoring tendons, hoses, umbilicals, and other subsea members. There are generally two kinds of water current induced stresses to which elements of a system may be exposed. The first kind of stress as mentioned above is caused by vortex-induced alternating forces that vibrate the underwater structure in a direction perpendicular to the direction of the current. These are 35 referred to as vortex-induced vibrations (VIV). When water flows past the 1 WO 2008/112758 PCT/US2008/056655 TH3214-PCT structure, vortices are alternately shed from each side of the structure. This produces a fluctuating force on the structure transverse to the current. These vibrations can, depending on the stiffness and the strength of the structure and any welds, lead to unacceptably short fatigue lives. The second type of stress is 5 caused by drag forces which push the structure in the direction of the current due to the structure's resistance to fluid flow. The drag forces may be amplified by vortex induced vibrations of the structure. For instance, a structure that is vibrating due to vortex shedding will disrupt the flow of water around it more so than a stationary umbilical. This results in greater energy transfer from the current 10 to the structure, and hence more drag. Many methods have been developed to reduce vibrations of sub sea structures. Some of these methods to reduce vibrations caused by vortex shedding from subsea structures operate by stabilization of the wake. These methods include streamlined fairings, wake splitters and flags. Streamlined or 15 teardrop shaped, fairings that swivel around a structure have been developed that almost eliminate the shedding or vortexes. Other conventional methods to reduce vibrations caused by vortex shedding from sub sea structures operate by modifying the boundary layer of the flow around the structure to prevent the correlation of vortex shedding along the length of the structure. Examples of such 20 methods include the use of helical strakes around a structure, or axial rod shrouds and perforated shrouds. U.S. Patent 6,695,539 discloses an apparatus and methods for remotely installing vortex-induced vibration (VIV) reduction and drag reduction devices on elongated structures in flowing fluid environments. The apparatus is a tool for 25 transporting and installing the devices. The devices installed can include clamshell-shaped strakes, shrouds, fairings, sleeves and flotation modules. U.S. Patent 6,695,539 is herein incorporated by reference in its entirety. Referring now to Figure 1, surface structure 102 is in body of water 100. Surface structure 102 is connected to subsurface structure 103 at seabed 108 by 30 connector member 104, such as a tower, riser, cable, or tendon. Current 110 encounters connector member 104. To protect connector member 104 from vibration caused by current 110, fairings 114 have been installed. One or more collars (not shown) may be installed between adjacent fairings. 2 WO 2008/112758 PCT/US2008/056655 TH3214-PCT When VIV suppression devices are installed on subsea structures, each suppression device needs to be transported from a surface vessel to the desired installation location on the structure. One method to achieve this is to have a ROV travel to the surface and install one device at a time. Other tools have been 5 proposed which can transport more than one device at a time on the tool. Each trip to the surface to retrieve a device increases the time and complexity of the installation. There is a need in the art for improved systems and methods for suppressing VIV. 10 There is a need in the art for systems and methods for suppressing VIV that do not suffer from the disadvantages of the prior art. There is a need in the art for systems and methods for providing VIV suppression devices to structures, and for improved installation systems and methods for the VIV suppression devices. 15 There is a need for systems and methods of installing VIV suppression devices with fewer trips required to the surface. These and other needs will become apparent to those of skill in the art upon review of this specification, including its drawings and claims. 20 Summary of the Invention In one aspect, the invention provides a system comprising a subsea structure beneath a body of water, subject to a water current; an installation vessel floating on the body of water; a line connected to the subsea structure and the installation vessel; and one or more vortex induced vibration suppression devices 25 connected to the line, which have been lowered from the vessel to be installed on the subsea structure. In another aspect, the invention provides a method, comprising installing a subsea structure in a body of water, wherein the subsea structure is subject to one or more water currents; covering at least a portion of an outside surface of the 30 subsea structure; connecting at least one line to the subsea structure and to a surface vessel; lowering at least one vortex induced vibration suppression device from the vessel on the line; and installing the vortex induced vibration suppression 3 WO 2008/112758 PCT/US2008/056655 TH3214-PCT device from the line to the exterior of the subsea structure, covering at least a portion of an outside surface of the subsea structure. Advantages of the invention may include one or more of the following: improved systems and methods for suppressing VIV; 5 systems and methods for suppressing VIV that do not suffer from the disadvantages of the prior art; systems and methods for providing VIV suppression devices to structures, and for improved installation systems and methods for the VIV suppression devices; and/or 10 systems and methods of installing VIV suppression devices with fewer trips required to the surface. Brief Description of the Figures Figure 1 illustrates a structure subject to a current. 15 Figures 2a-2e illustrate a system to install suppression devices on an underwater structure. Figures 3a-3b illustrate a fairing system being installed around a structure. Detailed Description 20 Referring now to Figure 2a, system 200 is illustrated. System 200 includes surface structure 202 near the surface of the water, which is attached to connector member 204. Connector member 204 is also connected to subsurface structure 203 near seafloor 208. Exterior to connector member 204 near seafloor 208, collar 220 has been installed. Vessel 222 is also near the surface of the water, 25 which is connected to collar 220 by one or more lines 224. Instead of collar 220, lines 224 can be connected to structure 202 by any suitable method, such as tying the line 224 near a joint of structure 202, near a flange of structure 202, welding or gluing line 224 to structure, or other suitable means as are known in the art. Referring now to Figure 2b, fairings 214 have been lowered from vessel 30 222 towards collar 220 along line 224. Fairings 214 act to reduce drag and/or vortex induced vibration acting on connector member 204 due to current 210. Fairings 214 may be heavier than water so that they sink towards collar 220. Fairings may be attached to each other with connectors 216. 4 WO 2008/112758 PCT/US2008/056655 TH3214-PCT Referring now to Figure 2c, vessel 222 is moved towards surface structure 202 so that fairings 214 and line 224 move closer to connector member 204. Referring now to Figure 2d, subsurface vessel 230 with attachment mechanism 232, for example arms, to grip fairings 214. Subsurface vessel 230 is 5 used to install fairings 214 about connector member 204. Referring now to Figure 2e, line 224, subsurface vessel 230 and vessel 222 have been removed after the completion of fairings 214 about connector member 204. Fairings 214 may be heavier than water so that they sink towards collar 220. Alternatively, fairings 214 may be lighter than water so that they float towards 10 another collar (not shown). Referring now to Figure 3a, fairing 314 is illustrated. Fairing 314 may be installed about structure 304. Fairing 314 is biased to a closed position, for example by a spring or by an elastic material. Fairing 314 includes member 316, which keeps fairing 314 from closing. Fairing 314 includes connection 15 mechanism, for example a male member 318a which can be received within and lock within a female member 318b. Fairing 314 includes two line guides 320a and 320b. Line guides 320a and 320b each can receive a line to lower fairing 314 to a desired location along structure 304, and to maintain the desired orientation of fairing 314 relative to structure 304, for example the opening of fairing 314 towards 20 structure 304. In operation, fairing 314 moves towards structure 304 as shown by the arrow, so that structure 304 disables member 316, and fairing 314 closes due to biasing force. When fairing 314 closes, male member 318a is locked within female 25 member 318b, as shown in Figure 3b. A space may be defined between the exterior of structure 304 and the interior of fairing 314, which allows fairing 314 to weathervane with varying current directions. One or more portions of the system may be or contain copper to retard 30 marine growth. Fairings may be replaced with strakes, shrouds, wake splitters, tail fairings, buoyancy modules, or other devices as are known in the art. Suitable sleeves, suitable collars, and suitable devices to install exterior to structures, and methods 5 WO 2008/112758 PCT/US2008/056655 TH3214-PCT of their installation are disclosed in U.S. Patent Application Number 10/839,781, having attorney docket number TH1433; U.S. Patent Application Number 11/400,365, having attorney docket number TH0541; U.S. Patent Application Number 11/419,964, having attorney docket number TH2508; U.S. Patent 5 Application Number 11/420,838, having attorney docket number TH2876; U.S. Patent Application Number 60/781,846 having attorney docket number TH2969; U.S. Patent Application Number 60/805,136, having attorney docket number TH1500; U.S. Patent Application Number 60/866,968, having attorney docket number TH3112; U.S. Patent Application Number 60/866,972, having attorney 10 docket number TH3190; U.S. Patent Number 5,410,979; U.S. Patent Number 5,410,979; U.S. Patent Number 5,421,413; U.S. Patent Number 6,179,524; U.S. Patent Number 6,223,672; U.S. Patent Number 6,561,734; U.S. Patent Number 6,565,287; U.S. Patent Number 6,571,878; U.S. Patent Number 6,685,394; U.S. Patent Number 6,702,026; U.S. Patent Number 7,017,666; and U.S. Patent 15 Number 7,070,361, which are herein incorporated by reference in their entirety. Suitable methods for installing fairings, collars, and other devices to install exterior to structures, are disclosed in U.S. Patent Application Number 10/784,536, having attorney docket number TH1853.04; U.S. Patent Application Number 10/848,547, having attorney docket number TH2463; U.S. Patent Application 20 Number 11/596,437, having attorney docket number TH2900; U.S. Patent Application Number 11/468,690, having attorney docket number TH2926; U.S. Patent Application Number 11/612,203, having attorney docket number TH2875; U.S. Patent Application Number 60/806,882, having attorney docket number TH2879; U.S. Patent Application Number 60/826,553, having attorney docket 25 number TH2842; U.S. Patent Number 6,695,539; U.S. Patent Number 6,928,709; and U.S. Patent Number 6,994,492; which are herein incorporated by reference in their entirety. The collars and/or fairings may be installed on the connector member before or after the connector member is placed in a body of water. 30 The collars, fairings and/or other devices exterior to the structure may have a clamshell configuration, and may be hinged with a closing mechanism opposite the hinge, for example a mechanism that can be operated with an ROV. 6 WO 2008/112758 PCT/US2008/056655 TH3214-PCT Collars may be placed between adjacent fairings, or between every 2 to 10 fairings. The collar may be a copper ring. Fairings may be provided with copper plates on their ends to allow them to weathervane with adjacent fairings or collars. 5 Fairings may be partially manufactured from copper. A biodegradable spacer may be placed between adjacent fairings to keep them from binding and allow them to weathervane after the spacer has degraded. Illustrative Embodiments 10 In one embodiment, there is disclosed a system comprising a subsea structure beneath a body of water, subject to a water current; a collar exterior to the subsea structure, covering at least a portion of an outside surface of the subsea structure; an installation vessel floating on the body of water; a line connected to the collar and the installation vessel; and one or more vortex induced 15 vibration suppression devices connected to the line, which have been lowered from the vessel to be installed on the subsea structure. In some embodiments, the subsea structure is selected from an umbilical, a tubular, a riser, and a tendon. In some embodiments, the vortex induced vibration suppression device comprises a fairing or a helical strake. In some embodiments, the line comprises at least two 20 lines, the votex induced vibration suppression devices connected to the at least two lines. In some embodiments, the vortex induced vibration suppression devices are negatively buoyant in water. In some embodiments, the vortex induced vibration suppression devices comprise one or more shoulders adapted to interface with the collar and/or other vortex induced vibration suppression devices. 25 In some embodiments, the system also includes a collar between two adjacent vortex induced vibration suppression devices, the collar connected to the line. In one embodiment, there is disclosed a method, comprising installing a subsea structure in a body of water, wherein the subsea structure is subject to one or more water currents; installing a collar exterior to the subsea structure, covering 30 at least a portion of an outside surface of the subsea structure; connecting at least one line to the collar and to a surface vessel; lowering at least one vortex induced vibration suppression device from the vessel towards the collar on the line; and installing the vortex induced vibration suppression device from the line to the 7 WO 2008/112758 PCT/US2008/056655 TH3214-PCT exterior of the subsea structure, covering at least a portion of an outside surface of the subsea structure. In some embodiments, the method also includes installing additional collars exterior to the subsea structure, the collars adapted to retain the vortex induced vibration suppression devices in an axial location along the subsea 5 structure. In some embodiments, the collar is installed on the subsea structure before the subsea structure is installed in the body of water. In some embodiments, the vortex induced vibration suppression device is installed on the subsea structure with a remotely operated vehicle (ROV). In some embodiments, the vortex induced vibration suppression device comprises an automatic closing 10 mechanism. In some embodiments, the vortex induced vibration suppression device is installed by moving the device adjacent to the subsea structure to activate the automatic closing mechanism. In some embodiments, connecting at least one line to the collar and to a surface vessel comprises connecting at least two lines; and lowering at least one vortex induced vibration suppression device 15 from the vessel towards the collar comprises lowering on the at least two lines. Those of skill in the art will appreciate that many modifications and variations are possible in terms of the disclosed embodiments, configurations, materials and methods without departing from their spirit and scope. Accordingly, the scope of the claims appended hereafter and their functional equivalents should 20 not be limited by particular embodiments described and illustrated herein, as these are merely exemplary in nature. 8
Claims (16)
1. A system, comprising: a subsea structure beneath a body of water, subject to a water current; an installation vessel floating on the body of water; a line connected to the subsea structure and the installation vessel; and 10 one or more vortex induced vibration suppression devices connected to the line, which have been lowered from the vessel to be installed on the subsea structure.
2. The system of claim 1, wherein the subsea structure is selected from an 15 umbilical, a tubular, a riser, and a tendon.
3. The system of one or more of claims 1-2, wherein the vortex induced vibration suppression device comprises a fairing or a helical strake. 20
4. The system of one or more of claims 1-3, wherein the line comprises at least two lines, the votex induced vibration suppression devices connected to the at least two lines.
5. The system of one or more of claims 1-4, wherein the vortex induced 25 vibration suppression devices are negatively buoyant in water.
6. The system of one or more of claims 1-5, wherein the vortex induced vibration suppression devices comprise one or more shoulders adapted to interface with a collar and/or other vortex induced vibration suppression devices. 30
7. The system of one or more of claims 1-6, further comprising a spacer between two adjacent vortex induced vibration suppression devices, the spacer connected to the line. 9 WO 2008/112758 PCT/US2008/056655 TH3214-PCT
8. The system of one or more of claims 1-7, further comprising a collar exterior to the subsea structure, covering at least a portion of an outside surface of the subsea structure. 5
9. The system of claim 8, wherein the line is connected to the collar and the installation vessel.
10. A method, comprising: 10 installing a subsea structure in a body of water, wherein the subsea structure is subject to one or more water currents; connecting at least one line to the subsea structure and to a surface vessel; lowering at least one vortex induced vibration suppression device from the vessel on the line; and 15 installing the vortex induced vibration suppression device from the line to the exterior of the subsea structure, covering at least a portion of an outside surface of the subsea structure.
11. The method of claim 10, further comprising: 20 installing one or more collars exterior to the subsea structure, the collars adapted to retain the vortex induced vibration suppression devices in an axial location along the subsea structure.
12. The method of one or more of claims 10-11, wherein a collar is installed on 25 the subsea structure before the subsea structure is installed in the body of water.
13. The method of one or more of claims 10-12, wherein the vortex induced vibration suppression device is installed on the subsea structure with a remotely operated vehicle (ROV). 30
14. The method of one or more of claims 10-13, wherein the vortex induced vibration suppression device comprises an automatic closing mechanism. 10 WO 2008/112758 PCT/US2008/056655 TH3214-PCT
15. The method of claim 14, wherein the vortex induced vibration suppression device is installed by moving the device adjacent to the subsea structure to activate the automatic closing mechanism. 5
16. The method of one or more of claims 10-15, wherein connecting at least one line to the collar and to a surface vessel comprises connecting at least two lines; and lowering at least one vortex induced vibration suppression device from the vessel comprises lowering on the at least two lines. 10 11
Applications Claiming Priority (3)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US89474807P | 2007-03-14 | 2007-03-14 | |
US60/894,748 | 2007-03-14 | ||
PCT/US2008/056655 WO2008112758A1 (en) | 2007-03-14 | 2008-03-12 | Vortex induced vibration suppression systems and methods |
Publications (1)
Publication Number | Publication Date |
---|---|
AU2008225139A1 true AU2008225139A1 (en) | 2008-09-18 |
Family
ID=39759989
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
AU2008225139A Abandoned AU2008225139A1 (en) | 2007-03-14 | 2008-03-12 | Vortex induced vibration suppression systems and methods |
Country Status (6)
Country | Link |
---|---|
US (1) | US20100098497A1 (en) |
AU (1) | AU2008225139A1 (en) |
BR (1) | BRPI0808832A2 (en) |
GB (1) | GB2459401A (en) |
NO (1) | NO20093106L (en) |
WO (1) | WO2008112758A1 (en) |
Families Citing this family (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
WO2024081417A1 (en) * | 2022-10-13 | 2024-04-18 | J. Ray Mcdermott, S.A. | Vortex-induced vibration (viv) suppression apparatus and method of installation |
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WO2006074309A1 (en) * | 2005-01-07 | 2006-07-13 | Shell Internationale Research Maatschappij B.V. | Vortex induced vibration optimizing system |
BRPI0608498A2 (en) * | 2005-03-23 | 2010-11-16 | Shell Intyernationale Res Mij | system and method for remotely detecting properties of an undersea structure |
WO2006110658A1 (en) * | 2005-04-11 | 2006-10-19 | Shell Internationale Research Maatschappij B.V. | Systems and methods for reducing vibrations |
US20060280559A1 (en) * | 2005-05-24 | 2006-12-14 | Allen Donald W | Apparatus with strake elements and methods for installing strake elements |
US20070003372A1 (en) * | 2005-06-16 | 2007-01-04 | Allen Donald W | Systems and methods for reducing drag and/or vortex induced vibration |
US7416025B2 (en) * | 2005-08-30 | 2008-08-26 | Kellogg Brown & Root Llc | Subsea well communications apparatus and method using variable tension large offset risers |
US20070125546A1 (en) * | 2005-09-02 | 2007-06-07 | Allen Donald W | Strake systems and methods |
US20070140797A1 (en) * | 2005-12-19 | 2007-06-21 | Armstrong Stephen P | Systems and methods for installation of clamshell devices around an element |
WO2007106761A2 (en) * | 2006-03-14 | 2007-09-20 | Shell Oil Company | Current tank systems and methods |
US7337742B1 (en) * | 2006-08-09 | 2008-03-04 | Viv Suppression, Inc. | Twin fin fairing |
-
2008
- 2008-03-12 US US12/530,679 patent/US20100098497A1/en not_active Abandoned
- 2008-03-12 WO PCT/US2008/056655 patent/WO2008112758A1/en active Application Filing
- 2008-03-12 AU AU2008225139A patent/AU2008225139A1/en not_active Abandoned
- 2008-03-12 BR BRPI0808832-2A patent/BRPI0808832A2/en not_active Application Discontinuation
-
2009
- 2009-08-06 GB GB0913749A patent/GB2459401A/en not_active Withdrawn
- 2009-10-06 NO NO20093106A patent/NO20093106L/en not_active Application Discontinuation
Also Published As
Publication number | Publication date |
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GB0913749D0 (en) | 2009-09-16 |
WO2008112758A1 (en) | 2008-09-18 |
BRPI0808832A2 (en) | 2014-08-26 |
NO20093106L (en) | 2009-10-06 |
US20100098497A1 (en) | 2010-04-22 |
GB2459401A (en) | 2009-10-28 |
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