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Deepwater Installation

Deepwater Installation. of Subsea Equipment. Presenter’s Name Title Department. Why we need to tackle this subject. The Industry plans to install a lot of subsea equipment over the next decade. Existing deployment systems have depth limitations.

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Deepwater Installation

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  1. Deepwater Installation of Subsea Equipment Presenter’s Name Title Department

  2. Why we need to tackle this subject • The Industry plans to install a lot of subsea equipment over the next decade. • Existing deployment systems have depth limitations. • At 20m/min winch payout and 10m/min recovery speeds it takes 5 hours to deploy and recover in 2000m. Each subsea component will take up to 24 hours to deploy. • Equipment location & orientation tolerances small. • It is extremely difficult for installation contractors to promise an acceptable technical, schedule and cost risk for a deepwater project.

  3. Why not use a drilling rig? Deepwater capable drilling rigs can deploy subsea equipment. For a project taking some 6 months for deployment a vessel costing $300,000 per day means a budget of around $54 million. A construction vessel deploys faster than a drill rig and is 1/3 of the day rate and does not tie up scarce drilling capability.

  4. Key Technical Issues • Variable current with time and depth. • Object geometry variability – often highly unsymmetrical. • ROV capability and control. • Response time to vessel motions and winch speed. • Line dynamics. • Steel line strength. • Durability of fibre ropes.

  5. Scale at 2000m 100m length deployment vessel Seabed

  6. Ambitions Preliminary views:- 2500m wd capability by 2005 Up to 200t objects Ability to connect wells and manifolds by jumper hoses

  7. Installation Variables Ship Deployment Systems Ship Motions at Surface Slow winches Envt. may change during deployment Varying Current Rope strength & varying Tn with depth ROV umbilical tangle with lowering line Currentload on umbilical ROV thrust capability & control Added mass Seabed positioning system capability 2 axis pendulum & twist motions Object settlement and tilt on seabed

  8. Potential Sources of knowledge outside the Oil Industry • Hydrographic & Survey Institutes • Salvage contractors. • Deepwater mining contractors.

  9. DISH JIP JIP launched to:- Phase 1 Identify near term and future installation requirements. Identify current capability. Identify what is needed to bridge the gap & prioritorise. Phase 2 Undertake the development work to deliver the prioritorised components, analysis capability and procedures.

  10. JIP Participants Operators BP, BG, Enterprise, Norsk Hydro, Statoil. Installation Contractors CSO, DSM, Herema, Oceaneering, Stolt. Suppliers BMT, Cooper Cameron, Deep Tek, Marlow Ropes Nautronix, OTM, Orcina, Scan Rope.

  11. Metocean Needs • Wind & wave data at surface for determining operability of dynamically positioned vessels. • Current velocity, direction and persistence through the water column. • Understanding of current generation phenomena and ability to predict occurrence and persistence of currents above deployment threshold.

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