WO2011041860A1 - Amortisseur hydrodynamique pour colonne montante en caténaire - Google Patents

Amortisseur hydrodynamique pour colonne montante en caténaire Download PDF

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Publication number
WO2011041860A1
WO2011041860A1 PCT/BR2009/000313 BR2009000313W WO2011041860A1 WO 2011041860 A1 WO2011041860 A1 WO 2011041860A1 BR 2009000313 W BR2009000313 W BR 2009000313W WO 2011041860 A1 WO2011041860 A1 WO 2011041860A1
Authority
WO
WIPO (PCT)
Prior art keywords
riser
hydrodynamic
segment
hydrodynamic damper
catenary
Prior art date
Application number
PCT/BR2009/000313
Other languages
English (en)
Portuguese (pt)
Inventor
Ludimar Lima De Aguiar
Ivan Fábio MOTA DE MENEZES
Marcio Mourelle Martins
Original Assignee
Petróleo Brasileiro S.A. - Petrobras
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Petróleo Brasileiro S.A. - Petrobras filed Critical Petróleo Brasileiro S.A. - Petrobras
Priority to PCT/BR2009/000313 priority Critical patent/WO2011041860A1/fr
Publication of WO2011041860A1 publication Critical patent/WO2011041860A1/fr

Links

Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16L—PIPES; JOINTS OR FITTINGS FOR PIPES; SUPPORTS FOR PIPES, CABLES OR PROTECTIVE TUBING; MEANS FOR THERMAL INSULATION IN GENERAL
    • F16L1/00—Laying or reclaiming pipes; Repairing or joining pipes on or under water
    • F16L1/12—Laying or reclaiming pipes on or under water
    • F16L1/20—Accessories therefor, e.g. floats, weights
    • 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
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16L—PIPES; JOINTS OR FITTINGS FOR PIPES; SUPPORTS FOR PIPES, CABLES OR PROTECTIVE TUBING; MEANS FOR THERMAL INSULATION IN GENERAL
    • F16L1/00—Laying or reclaiming pipes; Repairing or joining pipes on or under water
    • F16L1/12—Laying or reclaiming pipes on or under water
    • F16L1/14—Laying or reclaiming pipes on or under water between the surface and the bottom
    • F16L1/15—Laying or reclaiming pipes on or under water between the surface and the bottom vertically

Definitions

  • the present invention is in the field of components of an subsea oil production system. More particularly, this component is a free overhead catenary riser that carries hydrocarbons and other fluids involved in this oil production process. More specifically, it deals with devices in the form of overcoating sections that are applied to segments along the riser to modify their dynamic response and prevent buckling in the region where it touches the underwater ground.
  • a floating drilling unit is used to create a well.
  • a floating production unit which may be a semi-submersible platform, a float or a production vessel known to the experts as Floating Production Storage and Offloading (FPSO) is installed on site for production to be completed.
  • FPSO Floating Production Storage and Offloading
  • the main component for raising oil from the subsea below-ground reservoir to the floating production unit is a pipeline that transports hydrocarbons, water and other fluids used in the oil production process, also known as the riser and, by the term risef term by which it will be referenced hereinafter throughout this report.
  • the riser is also used for the transport of hydrocarbons between two platforms or between a platform and an earth drain.
  • Risers have various types of construction and can take various shapes and configurations.
  • the simplest and most commonly adopted configuration is the so-called free catenary.
  • the risers can be flexible or rigid.
  • Rigid risers are usually referred to by the technique as "SCR” (Steel Catenary Riser) and are generally made up of a plurality of welded steel tubes that provide simplicity of installation operation, no intermediate connections and reasonable compliance. against the movements that the floating unit of production may suffer because of the environment.
  • SCR Steel Catenary Riser
  • TDP Touch Down Point
  • vortex suppressors In order for this phenomenon to be prevented, devices known as vortex suppressors have been created and are installed along the length of the riser to guide the passage of the marine current through the riser in a non-turbulent manner.
  • vortex suppressors are employed and function in their various constructive forms known in the art, these devices end up generating too much of the riser's final cost, due not only to the cost of the device itself, but also to the time it takes to install it on top of it. the riser.
  • US 4,400,110 (Pierre A. Beynet), incorporated herein by reference, describes a floating production system for oil and gas producing wells that employs a subsurface float to decrease stress on a flexible ripper used to connect a production pipe to a floating unit.
  • the subsurface float uses a cradle mount with a drag balancing device to counteract the torsion moments applied to the cradle by the effect of marine currents.
  • US 6,824,330 (Avie Max Grobe), inserted herein as Reference, presents a catenary riser system that includes a tensioning mechanism in a floating structure that applies a substantially constant and controlled tension to the riser, which is coupled to the floating structure by a flexible conduit. More specifically, the upper portion of the riser is above the water surface and is connected to the tensioning mechanism by means of a rope, cable, chain or wire. Hydraulically the top of the riser is connected to a flexible conduit that carries fluids from inside the riser to the floating structure. Constant tensioning of the tensioning mechanism is intended to minimize the effects of riser fatigue by extending its life and avoiding fixed connection arrangements known in the art.
  • WO 2007/017574 discloses a curvature limiter for a subsea hydrocarbon transfer system, characterized in that it comprises a flexible tubular member where an intermediate portion of this flexible tube comprises a plurality of successive substantially circular sections pivotally mounted relative to each other defining a median plane such that the flexible tube forms a moderate curvature equal to the radius of curvature of this median plane.
  • the objective is to keep the intermediate portion of the flexible tube in suspension between the underwater floor and the floating structure.
  • WO 2009/063163 discloses a flexible pipe support system in which a number of adapted supports on the flexible pipe, which serve to maintain the pipe at a certain height from the underwater floor. , print controlled buoyancy to a stretch of hose and be adaptable and compliant with the conditions under which hose can experience under the influence of the medium.
  • the technique still resents an alternative to avoid the reduced service life, particularly in SCR-type risers, in an efficient and straightforward manner.
  • Objectives of the present invention are: reducing the buckling phenomenon at the point where an SCR-type riser in a free catenary configuration touches the underwater floor, reducing its apparent weight and reducing the fatigue-damaging material of which it is used.
  • the riser is formed, whether these problems are caused by movements from the floating unit to which it is attached, or by the passage of marine currents around the riser.
  • the main characteristic of the hydrodynamic damper is eminently functional, that is, the hydrodynamic damper has the function of stopping the propagation of a compressive wave by the riser, inducing a controlled and expected buckling at a certain distance from the riser touch point with the riser. undersea soil.
  • VIV Vortex Induced Vibration Fatigue
  • the hydrodynamic damper of the present invention has a plurality of possible and scenario-dependent embodiments, but the feature common to all One embodiment is the conformation of an overcoat with easy adaptation and keeping the riser in the free catenary configuration.
  • Figures 1A, 1B, 1C and 1D are representations of some possible embodiments for the hydrodynamic damper of the present invention installed on a SCR type riser.
  • Figure 2 is a representation of the application of the hydrodynamic damper of the present invention on only one segment of the SCR and without hydrodynamic load.
  • Figure 3 is a representation of the application of the hydrodynamic damper of Figure 2 where this damper is in the deformed configuration due to the action of hydrodynamic loads.
  • Figure 4 is a representation of the application of the hydrodynamic damper of the present invention to more than one segment of the SCR also showing its deformed configuration.
  • riser will hereinafter be used as a designation for specifying an SCR ⁇ Steel Catenary Riser) riser.
  • a first experiment in finding a solution to the buckling problem involved the use of a lightweight stretch at the point where the riser touches the undersea ground, taking into consideration as a floating unit an anchored FPSO-type vessel. multipoint, receiving the incidence of extreme waves in an ultra deep water depth, was negative in relation to the efficiency in reducing extreme stresses in the riser.
  • the objectives of the present invention have been achieved by applying one or more lightweight patches over riser segments that lie along the suspended length rather than just in the TDP region (P).
  • Hydrodynamic dampers (1) of the present invention are characterized by interrupting the propagation of a compressive wave (O) by the riser (R) by inducing a calculated and controlled buckling in a portion of the suspended length of the riser (R) at a certain distance from the touch point (P) of the riser (R) with the submarine ground, ie the TDP region.
  • Figures 1A, 1B, 1C and 1D show possible, but not limiting embodiments for the hydrodynamic damper, object of the present invention.
  • the hydrodynamic damper (1) comprises a single lightweight, constant diameter stretch (11) applied over at least one suspended length segment of a riser (R).
  • the hydrodynamic damper (1) comprises a larger diameter stretch (12) of light coating applied over at least one suspended length segment of a riser (R) and at least at least one light-lined stretch (11) installed near at least one end of the larger diameter stretch (12), stretch (11) intermediate diameter between the riser diameter and the largest diameter stretch (12).
  • the hydrodynamic damper (1) comprises a larger diameter stretch (12) of light coating applied over at least one suspended length segment of at least one riser (R). a lightweight transitional section (13) installed near at least one end of the larger diameter section (12) and at least one lightweight section (11) installed near at least one , one end of the transition stretch (13), which has an intermediate diameter between the riser diameter (R) and the stretch diameter of (11)
  • the hydrodynamic damper (1) comprises a light-coated segment (16) of variable diameter, where this diameter continuously increases from its ends (E1, E2) in diameter close to the diameter of the riser (R), to a maximum diameter (Dm), segment (16) which is applied over at least one segment of the suspended length of the riser (R).
  • the use of the stretch (11) in relation to the ends of the larger diameter stretch (12) has a positioning that can be chosen from: at one end, and at both ends.
  • the portion 11 When employed more than one unit, the portion 11 may be chosen from: having same length, having different lengths, having same diameters and having different diameters from each other.
  • (11) in relation to the ends of the larger diameter section (12) has a position which can be chosen from: being asymmetric with different sections (11, 13), with more than one section (11, 13) at one end and, at least one element at the other end and sections (11, 13) at only one end.
  • the hydrodynamic damper (1) employs as its constituent common liner material which simultaneously meets the mechanical strength and low density requirements.
  • a typical example of this material is the commonly used commercially available riser (R) thermal coatings.
  • Figure 2 shows a hydrodynamic damper in one possible embodiment applied to a suspended length segment of the riser (R) away from the TDP region (P) and in a hydrodynamically load (CH) free situation.
  • Figure 3 shows a hydrodynamic damper (1) under the propagation action of a compressive wave (O) and hydrodynamic loads (CH).
  • the diameter of the riser (R) becomes larger in the segment where the hydrodynamic damper is applied.
  • the loads perpendicular to the riser wall (R) are proportional to its hydrodynamic diameter. Due to this, the hydrodynamic loads in this segment will also be higher.
  • the control of the riser segment curvature (R) as a function of the magnitude of the load request can be obtained by controlling parameters that include: the segment length, the material specific weight and the hydrodynamic damper thickness (1).
  • Figure 4 illustrates a situation where more than one riser segment (R) is equipped with a hydrodynamic damper, which increases the efficiency in stopping compressive wave propagation (O) and solving the buckling problem in the region (P ) of the TDP.
  • the hydrodynamic dampers (1) can be observed in a situation of deformation due to the fact that they are subjected to hydrodynamic (CH) and compression loads.
  • hydrodynamic shock absorbers opens the possibility of using free catenary steel risers (R), which is still the simplest and most robust riser (R) concept without the high cost of applying vortex suppressors, and eliminating problems with the use of SCR due to extreme events.
  • the main concept underlying the present invention which is a hydrodynamic damper (1) which has the function of stopping the propagation of a compressive wave (O) by a riser ( R) inducing buckling in a controlled and expected manner at a certain distance from the riser touch region (P) with the submarine ground remains preserved in its innovative character, where those usually employed in the art may envision and practice appropriate variations, modifications, alterations, adaptations and equivalents to the working environment in question, without, however, departing from the scope and scope of the present invention. , which are represented by the following claims.

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  • Engineering & Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Geology (AREA)
  • Mining & Mineral Resources (AREA)
  • Physics & Mathematics (AREA)
  • Environmental & Geological Engineering (AREA)
  • Fluid Mechanics (AREA)
  • General Life Sciences & Earth Sciences (AREA)
  • Geochemistry & Mineralogy (AREA)
  • Earth Drilling (AREA)

Abstract

La présente invention concerne l'utilisation d'amortisseurs hydrodynamiques (1) dans au moins un segment déterminé d'une colonne montante (R). L'amortisseur hydrodynamique (1) se caractérise principalement en ce qu'il interrompt la propagation d'une onde de compression (O) dans la colonne montante (R), induisant un flambage de manière contrôlée et prévue, à une certaine distance du point de contact (P) de la colonne montante (R) sur le fond marin. L'amortisseur hydrodynamique de l'invention peut présenter différentes configurations qui peuvent être combinées de différentes manières.
PCT/BR2009/000313 2009-10-09 2009-10-09 Amortisseur hydrodynamique pour colonne montante en caténaire WO2011041860A1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
PCT/BR2009/000313 WO2011041860A1 (fr) 2009-10-09 2009-10-09 Amortisseur hydrodynamique pour colonne montante en caténaire

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
PCT/BR2009/000313 WO2011041860A1 (fr) 2009-10-09 2009-10-09 Amortisseur hydrodynamique pour colonne montante en caténaire

Publications (1)

Publication Number Publication Date
WO2011041860A1 true WO2011041860A1 (fr) 2011-04-14

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Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2023245267A1 (fr) 2022-06-22 2023-12-28 Subsea 7 Do Brasil Servicos Ltda Amélioration de la résistance à la fatigue de colonnes montantes de caténaires en acier
WO2023245268A1 (fr) 2022-06-22 2023-12-28 Subsea 7 Do Brasil Servicos Ltda Amélioration de la résistance à la fatigue de risers caténaires en acier

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5639187A (en) * 1994-10-12 1997-06-17 Mobil Oil Corporation Marine steel catenary riser system
US6695540B1 (en) * 2000-11-14 2004-02-24 Weldon Taquino Vortex induced vibration suppression device and method
US7070361B2 (en) * 2003-03-06 2006-07-04 Shell Oil Company Apparatus and methods for providing VIV suppression to a riser system comprising umbilical elements
US7077603B2 (en) * 2003-12-10 2006-07-18 Institut Francais Du Petrole Stress limiting device for offshore oil reservoir production pipe
US7458752B2 (en) * 2002-08-28 2008-12-02 Lankhorst Special Mouldings B.V. Suppression element for vortex-induced vibrations

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5639187A (en) * 1994-10-12 1997-06-17 Mobil Oil Corporation Marine steel catenary riser system
US6695540B1 (en) * 2000-11-14 2004-02-24 Weldon Taquino Vortex induced vibration suppression device and method
US7458752B2 (en) * 2002-08-28 2008-12-02 Lankhorst Special Mouldings B.V. Suppression element for vortex-induced vibrations
US7070361B2 (en) * 2003-03-06 2006-07-04 Shell Oil Company Apparatus and methods for providing VIV suppression to a riser system comprising umbilical elements
US7077603B2 (en) * 2003-12-10 2006-07-18 Institut Francais Du Petrole Stress limiting device for offshore oil reservoir production pipe

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2023245267A1 (fr) 2022-06-22 2023-12-28 Subsea 7 Do Brasil Servicos Ltda Amélioration de la résistance à la fatigue de colonnes montantes de caténaires en acier
WO2023245268A1 (fr) 2022-06-22 2023-12-28 Subsea 7 Do Brasil Servicos Ltda Amélioration de la résistance à la fatigue de risers caténaires en acier

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