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Overview of SURF Systems & Analysis

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1 Overview of SURF Systems & Analysis
presentation introduction Overview of SURF Systems & Analysis Presenter: Tarun Rewari Director – Aryatech Marine & Offshore Software: OrcaFlex What does SURF mean? S Subsea construction U Umbilicals R Risers F Flowlines Aryatech Marine & Offshore Services

2 Define a deepwater system
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3 Define a ‘Deepwater System’
‘deepwater’ marine systems Define a ‘Deepwater System’ Deepwater marine system Floater system Whatever we call it (and plenty of definitions), these systems are not rigidly connected to seabed. They have a ‘floater’ with ‘lines’ between floater and seabed Redefine as Aryatech Marine & Offshore Services

4 Define a ‘Deepwater System’
‘deepwater’ marine systems Define a ‘Deepwater System’ Though clearly important and linked, this presentation focuses on the design and analysis of SURF systems Floater SURF Reservoir Aryatech Marine & Offshore Services

5 Water Depth Floater systems range in water depth: 10m <> 2000m
‘deepwater’ marine systems Water Depth Floater systems range in water depth: 10m <> 2000m Aryatech Marine & Offshore Services

6 ‘deepwater’ marine systems
Design Life There are a variety of time frames (though no rigid distinction): Permanent systems (life of field, ≈25 years) Temporary systems (temp operations, few months) Installation (construction / decommissioning, few hours, maybe a day) Analyses and main components are similar. Main differences: env. return periods, acceptance criteria Aryatech Marine & Offshore Services

7 Main System Components
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8 main system components
Main Components Floaters SURF top end boundary condition with various functions. (FPSOs, Semi-submersibles, TLPs, SPARs, offloading shuttles, drilling, installation / decommissioning) Moorings multi-component wire, chain, polyester used to keep floater on-station. (spread, turret, SPMs, ‘jetty’, catenary, taut, hawsers) Risers dynamic pipe (or pipe assembly), to transfer production or injection fluids, control fluids or lift gas between seafloor and floater. (SCR, TTR, flexible, hybrids, export systems (incl. hoses), flexible jumpers) Aryatech Marine & Offshore Services

9 main system components
Main Components Umbilicals Assembly of hydraulic hoses used to control subsea structures from a host. Loaded statically and dynamically. (power, control, chemical injection, hydraulic fluids, etc) Flowlines static flexible pipe on seafloor for transportation of production or injection fluids. (Generally infield, linking subsea structures, or to a production facility. 100’s m < length < several km) Jumper short pipe connecting flowlines and (flexible or rigid) subsea structures or close subsea structures. Loaded statically &dynamically Aryatech Marine & Offshore Services

10 main system components
Main Components Installation lower to seabed (‘payloads’, anchors, etc) lay flow- & pipelines (J-, S- & reel-lay) pre-lay risers & moorings vessel hook-up floatover heavy lift pipelay vessels, barges Also recovery for repairs and re-installation, and decommissioning for permanent removal Aryatech Marine & Offshore Services

11 main system components
Main Components Other parts: bend stiffeners tapered stress joints mid-water arches (MWAs) riser towers, riser tethers anchors cranes / winches / tensioner systems payloads (PLETs, PLEMs, BOPs, etc) J-tubes stingers & rollers moonpools buoyancy modules & clump weights drag chains Aryatech Marine & Offshore Services

12 Main Components – ‘flexibles’
main system components Main Components – ‘flexibles’ TLP Turret moored FPSO SPM Semi-submersible transfer lines jumpers flowlines risers buoyant ‘steep’ wave mid-water arch riser tower export lines Aryatech Marine & Offshore Services

13 Main Components – ‘rigid lines’
main system components Main Components – ‘rigid lines’ Aryatech Marine & Offshore Services

14 Main Components - installation
main system components Main Components - installation Floatover Jacket launch S-lay Pull-in Lower to seabed Recovery / re-installation Load transfer Colin Lewis to supply some nice OrcaFlex screenshots of some of the components on the previous slide. Aryatech Marine & Offshore Services

15 Main Analysis Steps Aryatech Marine & Offshore Services

16 Both Concept Selection and main Engineering Design
main analysis steps Main Analysis Steps High level main systems design loop In principle a strong feedback loop, though in practice, analysis does not often reflect this Floater Moorings SURF Installation Both Concept Selection and main Engineering Design Aryatech Marine & Offshore Services

17 Interference analysis
main analysis steps Main Analysis Steps For floater, moorings, SURF and installation, some or all of the following required: Static load screening VIV analysis Extreme dynamics Interference analysis Fatigue Concept design Acceptable design Installation Aryatech Marine & Offshore Services

18 Concept / FEED Main considerations:
main analysis steps Concept / FEED Main considerations: costs regulatory issues existing infrastructure floater availability environment reservoir characteristics Initial evaluation often done through proprietary scenario simulators to evaluate production from different options Aryatech Marine & Offshore Services

19 Acceptance Criteria for ‘lines’ Aryatech Marine & Offshore Services

20 acceptance criteria, rules & regs
Once analysis completed, results are then assessed against various acceptance criteria: Internal loads (components, buckling, utilisation, end loads) Interference (clearances with other items) Fatigue (predicted vs. life of field) Above to be checked for all systems (moorings, SURF and installation), though some detailed checks may not apply to all Aryatech Marine & Offshore Services

21 Design Philosophy Philosophy varies from code to code
acceptance criteria, rules & regs Design Philosophy Philosophy varies from code to code Focus on two different methods for structural design Working Stress Design (WSD) Limit State Design/Load and Resistance Factored Design (LRFD) Aryatech Marine & Offshore Services

22 acceptance criteria, rules & regs
Codes in Common Use There are many different codes covering several applications: Dynamic Systems Codes Codes specific to Rigid Risers Codes specific to Flexibles (umbilicals, risers, hoses) Codes specific to Mooring (incl. anchors) Codes specific to Installation (including pipelay, heavy lift, etc) Aryatech Marine & Offshore Services

23 Floater Types Aryatech Marine & Offshore Services

24 floater types Hull Forms Permanent: But must also remember wide variety of ‘temporary’ floaters associated with field construction, repair and decommissioning – installation vessels, barges, offloading vessel, pipelay, crane lift, transportation Aryatech Marine & Offshore Services 24

25 Existing GoM Floaters floater types
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26 Semi-submersible Hull
floater types Semi-submersible Hull Pontoons Columns Bracings Free floating hull many variants catenary or taut moorings anchors vertical or catenary risers Aryatech Marine & Offshore Services 26

27 Tension Leg Platform (TLP)
floater types Tension Leg Platform (TLP) Ballasted hull keeps tendons in tension Tension minimises heave Inverted pendulum Springing / ringing & setdown Aryatech Marine & Offshore Services 27

28 SPARs Vertical column floater First spars had solid hull
floater types SPARs Vertical column floater First spars had solid hull 2nd generation truss hull 3rd generation cell hull Mooring similar to semi-sub VIM & 2nd order vertical motions VIV strakes Aryatech Marine & Offshore Services 28

29 Shipshape Hull Conventional spreadmoor
floater types Shipshape Hull Conventional spreadmoor Single point mooring outside of hull Single point mooring contained in hull Aryatech Marine & Offshore Services 29

30 Hull Installation Deck Mating as fixed platform – but with moving hull
floater types Hull Installation Deck Mating as fixed platform – but with moving hull Spar – Loadout and Tow / Upending Shipshape – towed Semisub/TLP – heavy lift vessel Aryatech Marine & Offshore Services

31 Mooring & Anchoring Systems
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32 Mooring Systems Re-cap on main types Mooring line Anchor types
mooring & anchoring Mooring Systems Re-cap on main types catenary or taut spread or single point (weathervaning) temporary or permanent Mooring line seabed end termination is a fixed location vessel end termination moves with vessel weight controlled thru materials (chain, wire rope, synthetic rope) accessories (links, eyes, shackles, sockets, fairleads, winches, stoppers) Anchor types drag embedment suction caisson Aryatech Marine & Offshore Services 32

33 Catenary vs. Taut Mooring
mooring & anchoring Catenary vs. Taut Mooring Catenary heavy in deep water line horizontal at seabed anchor subject to horizontal forces restoring forces by line weight Taut leg line non-horizontal at seabed anchor sees non-horizontal forces restoring forces by line elasticity smaller footprint than catenary mooring Aryatech Marine & Offshore Services

34 Anchor Types Deadweight (gravity base) Piling (driven)
mooring & anchoring Anchor Types Deadweight (gravity base) Piling (driven) Drag embedment anchors Suction anchors Vertically loaded anchors (VLA) Suction Embedded Plate Anchor (SEPLA) 75 ft Aryatech Marine & Offshore Services

35 Additional Mooring Components
mooring & anchoring Additional Mooring Components Buoys may be in-line or attached to the line provide buoyancy to reduced load on platform add compliance to a mooring line generally kept below surface to avoid additional wave loading Sinker weights and Deadman additional clump weights added to lines weight line down (invert catenary) sinker weights in water column dead man on seabed – similar to gravity base anchor Aryatech Marine & Offshore Services

36 Mooring Design Codes Most common Additional for anchors
mooring & anchoring Mooring Design Codes Most common API RP2SK – Rules for Station Keeping (mooring line and anchors) API RP2SM – Synthetic mooring lines DNV-RP-E301 – Position Mooring Additional for anchors DNV-RP-E303 – Design and Installation of Suction Anchors In Clay DNV-RP-E302 - Design and Installation of Plate Anchors in Clay DNV-RP-E301 - Design And Installation Of Fluke Anchors In Clay Codes apply different factors of safety for distinguish between permanent vs. mobile mooring intact and damaged condition quasi-static vs. dynamic analysis Aryatech Marine & Offshore Services

37 Anchor Proof Test For the analysis For the installation
mooring & anchoring Anchor Proof Test For the analysis mooring line analysis gives loads at seabed fixed point demonstrate anchor can achieve a prescribed load For the installation vessel pull on mooring line for period of time demonstrates that anchor can take intended loads Aryatech Marine & Offshore Services

38 Risers Aryatech Marine & Offshore Services

39 riser systems Riser Systems Transportation of production hydrocarbons and other fluids between seabed and floater oil/gas – import or export, reinjection water – export, injection Drilling and work over operations (may also contain hydraulic lines or electrical lines) Can be bundle (several lines in one carrier pipe) Can be a pipe-in-pipe May be added to a facility after initial installation (eg, tieback from new wells) Aryatech Marine & Offshore Services

40 Common Configurations
riser systems Common Configurations Aryatech Marine & Offshore Services

41 Riser Systems – pros & cons
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42 Riser Systems – pros & cons
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43 Riser Systems – pros & cons
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44 Riser Systems – pros & cons
Aryatech Marine & Offshore Services

45 Umbilicals Aryatech Marine & Offshore Services

46 Umbilical Applications
umbilicals Umbilical Applications Transfer hydraulic and electrical power Data logging (electrical or fiber optic) Chemicals for well control (methanol) Transfer between floater and seabed Transfer between wells and manifolds Aryatech Marine & Offshore Services

47 Director - Aryatech Marine & Offshore www.aryatech.net
Tarun Rewari Director - Aryatech Marine & Offshore


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