US20100098497A1 - Vortex induced vibration suppression systems and methods - Google Patents

Vortex induced vibration suppression systems and methods Download PDF

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Publication number
US20100098497A1
US20100098497A1 US12/530,679 US53067908A US2010098497A1 US 20100098497 A1 US20100098497 A1 US 20100098497A1 US 53067908 A US53067908 A US 53067908A US 2010098497 A1 US2010098497 A1 US 2010098497A1
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US
United States
Prior art keywords
subsea structure
vibration suppression
induced vibration
vortex induced
line
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.)
Abandoned
Application number
US12/530,679
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English (en)
Inventor
Donald Wayne Allen
Stephen Paul Armstrong
Richard Bruce McDaniel
Catherine Anne Preator
David Wayne McMillan
Janet Kay McMillan
Christopher Steven West
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Shell USA Inc
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Individual
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Filing date
Publication date
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Priority to US12/530,679 priority Critical patent/US20100098497A1/en
Assigned to SHELL OIL COMPANY reassignment SHELL OIL COMPANY ASSIGNMENT OF ASSIGNORS INTEREST (SEE DOCUMENT FOR DETAILS). Assignors: ON BEHALF OF RICHARD BRUCE MCDANIEL (DECEASED), WEST, CHRISTOPHER STEVEN, ALLEN, DONALD WAYNE, ARMSTRONG, STEPHEN PAUL, MCMILLAN, JANET KAY
Publication of US20100098497A1 publication Critical patent/US20100098497A1/en
Abandoned legal-status Critical Current

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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
    • B63B21/50—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

Definitions

  • 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).
  • VIV vortex-induced vibrations
  • 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, anchoring tendons, hoses, umbilicals, and other subsea members.
  • 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 referred to as vortex-induced vibrations (VIV).
  • VIV vortex-induced vibrations
  • the second type of stress is 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 to the structure, and hence more drag.
  • U.S. Pat. No. 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 transporting and installing the devices.
  • the devices installed can include clamshell-shaped strakes, shrouds, fairings, sleeves and flotation modules.
  • U.S. Pat. No. 6,695,539 is herein incorporated by reference in its entirety.
  • surface structure 102 is in body of water 100 .
  • Surface structure 102 is connected to subsurface structure 103 at seabed 108 by connector member 104 , such as a tower, riser, cable, or tendon.
  • Current 110 encounters connector member 104 .
  • fairings 114 have been installed.
  • One or more collars may be installed between adjacent fairings.
  • each suppression device 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 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.
  • 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 connected to the line, which have been lowered from the vessel to be installed on the subsea structure.
  • 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 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 device from the line to the exterior of the subsea structure, covering at least a portion of an outside surface of the subsea structure.
  • FIG. 1 illustrates a structure subject to a current.
  • FIGS. 2 a - 2 e illustrate a system to install suppression devices on an underwater structure.
  • FIGS. 3 a - 3 b illustrate a fairing system being installed around a structure.
  • 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 .
  • collar 220 has been installed.
  • Vessel 222 is also near the surface of the water, which is connected to collar 220 by one or more lines 224 .
  • 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.
  • fairings 214 have been lowered from vessel 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 .
  • vessel 222 is moved towards surface structure 202 so that fairings 214 and line 224 move closer to connector member 204 .
  • subsurface vessel 230 with attachment mechanism 232 , for example arms, to grip fairings 214 .
  • Subsurface vessel 230 is used to install fairings 214 about connector member 204 .
  • Fairings 214 may be heavier than water so that they sink towards collar 220 .
  • fairings 214 may be lighter than water so that they float towards another collar (not shown).
  • 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 mechanism, for example a male member 318 a which can be received within and lock within a female member 318 b.
  • Fairing 314 includes two line guides 320 a and 320 b.
  • Line guides 320 a and 320 b 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 structure 304 .
  • 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.
  • 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 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 of their installation are disclosed in U.S. patent application Ser. No. 10/839,781, having attorney docket number TH1433; U.S. patent application Ser. No. 11/400,365, having attorney docket number TH0541; U.S. patent application Ser. No. 11/419,964, having attorney docket number TH2508; U.S. patent application Ser. No. 11/420,838, having attorney docket number TH2876; U.S. patent application Ser. No.
  • 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.
  • 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.
  • 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. 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.
  • 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 vibration suppression devices connected to the line, which have been lowered from the vessel to be installed on the subsea structure.
  • the subsea structure is selected from an umbilical, a tubular, a riser, and a tendon.
  • the vortex induced vibration suppression device comprises a fairing or a helical strake.
  • the line comprises at least two lines, the votex induced vibration suppression devices connected to the at least two lines.
  • the vortex induced vibration suppression devices are negatively buoyant in water.
  • 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.
  • the system also includes a collar between two adjacent vortex induced vibration suppression devices, the collar connected to the line.
  • 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 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 exterior of the subsea structure, covering at least a portion of an outside surface of the subsea structure.
  • 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 structure.
  • the collar is installed on the subsea structure before the subsea structure is installed in the body of water.
  • the vortex induced vibration suppression device is installed on the subsea structure with a remotely operated vehicle (ROV).
  • the vortex induced vibration suppression device comprises an automatic closing mechanism.
  • the vortex induced vibration suppression device is installed by moving the device adjacent to the subsea structure to activate the automatic closing mechanism.
  • 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 towards the collar comprises lowering on the at least two lines.

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  • Engineering & Computer Science (AREA)
  • Geology (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Mining & Mineral Resources (AREA)
  • Geochemistry & Mineralogy (AREA)
  • Fluid Mechanics (AREA)
  • Environmental & Geological Engineering (AREA)
  • General Life Sciences & Earth Sciences (AREA)
  • Physics & Mathematics (AREA)
  • Mechanical Engineering (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)
US12/530,679 2007-03-14 2008-03-12 Vortex induced vibration suppression systems and methods Abandoned US20100098497A1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
US12/530,679 US20100098497A1 (en) 2007-03-14 2008-03-12 Vortex induced vibration suppression systems and methods

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
US89474807P 2007-03-14 2007-03-14
PCT/US2008/056655 WO2008112758A1 (en) 2007-03-14 2008-03-12 Vortex induced vibration suppression systems and methods
US12/530,679 US20100098497A1 (en) 2007-03-14 2008-03-12 Vortex induced vibration suppression systems and methods

Publications (1)

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US20100098497A1 true US20100098497A1 (en) 2010-04-22

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US (1) US20100098497A1 (pt)
AU (1) AU2008225139A1 (pt)
BR (1) BRPI0808832A2 (pt)
GB (1) GB2459401A (pt)
NO (1) NO20093106L (pt)
WO (1) WO2008112758A1 (pt)

Cited By (1)

* Cited by examiner, † Cited by third party
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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GB2091189A (en) * 1981-01-20 1982-07-28 Standard Telephones Cables Ltd Fairings for towed underwater cable
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US5410979A (en) * 1994-02-28 1995-05-02 Shell Oil Company Small fixed teardrop fairings for vortex induced vibration suppression
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US20080056828A1 (en) * 2004-05-17 2008-03-06 Allen Donald W Methods and Apparatus for Installation of a Device about a Marine Structure
US7398697B2 (en) * 2004-11-03 2008-07-15 Shell Oil Company Apparatus and method for retroactively installing sensors on marine elements
US7316525B2 (en) * 2005-01-07 2008-01-08 Shell Oil Company Vortex induced vibration optimizing system
US20060233485A1 (en) * 2005-03-23 2006-10-19 Allen Donald W Underwater structure monitoring systems and methods
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US20070140797A1 (en) * 2005-12-19 2007-06-21 Armstrong Stephen P Systems and methods for installation of clamshell devices around an element
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Cited By (1)

* Cited by examiner, † Cited by third party
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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AU2008225139A1 (en) 2008-09-18
GB2459401A (en) 2009-10-28
NO20093106L (no) 2009-10-06

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