1 / 23

Metocean Committee 2002-4 activities

Metocean Committee 2002-4 activities. Chris Shaw Chairman OGP Metocean Committee Shell International E&P. Metocean Committee. Application of (new) metocean technology in the (offshore) oil and gas industry Balance economic benefits with appropriate safety margins

paxton
Download Presentation

Metocean Committee 2002-4 activities

An Image/Link below is provided (as is) to download presentation Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author. Content is provided to you AS IS for your information and personal use only. Download presentation by click this link. While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server. During download, if you can't get a presentation, the file might be deleted by the publisher.

E N D

Presentation Transcript


  1. Metocean Committee 2002-4 activities Chris Shaw Chairman OGP Metocean Committee Shell International E&P

  2. Metocean Committee Application of (new) metocean technology in the (offshore) oil and gas industry Balance economic benefits with appropriate safety margins Develop standards and guidelines Meets twice/year, in Europe and USA

  3. Metocean Committee2002-4 activities

  4. West Africa Swell Project (WASP) • Better discrimination of low frequency end of wave spectrum is one of most pressing problems for design and analysis of floating systems • Floating systems very sensitive to peak periods and the shape of the spectrum • West Africa is particularly important area

  5. Development of a Swell Event offshore Nigeria

  6. Development of a Swell Event at Bonga

  7. WASP: Project status • Seven participants signed up • Data assembled - being processed to calculate directional spectra and partition into sea and swell components • Preliminary results in May 03; Final in Q4 03

  8. Analyses • Comparison of Measurements and Hindcasts • Scatter Plots of Hs and Tp • Joint Environmental Contours • Shape of the Swell Peak in the Power Spectrum • Directional Characteristics of Swell • Response Spectra • Stationarity of the sea state • Infragravity Waves

  9. Ocean Turbulence Measurements • Almost no full scale data on turbulence scales of interest • Spar Responses on 60 - 600 seconds are of interest • Associated Turbulence Scales are about 60 - 600 m • Current turbulence data typically is on the scale of 10s to 100s of km, or on very small (mm) scale. • 15 min current averaging is standard… all turbulence information of interest is lost! • Ocean Model Basins have difficulty generating low turbulence currents

  10. Ocean Turbulence Measurements

  11. DeepStar Turbulence Program • Workshop held in Houston November 6-7/02 • Strategies for measurement program identified • Request for planning letters sent to interested investigators • Field program planned this year, results in Q1/04

  12. ADCPs & CT sensors on towed fish (RGL Victoria BC)

  13. Squall Measurement and Analysis Project winter storm squall Squalls are short-lived but intense Squalls are thunderstorms Squalls tend to form along lines

  14. Determine the mooring line size for spread moored FPSOs offshore West Africa • Pose an operational hazard for connecting tankers to CALMS and FPSOs offshore West Africa • Determine the maximum offset for floating production systems offshore West Africa • Pose a potential fire hazard due to lightning strikes

  15. laterally coherent gust laterally uncorrelated gust Principal knowledge gaps • Lateral coherence of gusts is unknown • Assume gusts longer than 1 minute are coherent over the entire length of an FPSO or tanker (conservative?)

  16. Bonga EDOP Proposed project • Jointly funded industry project (uniform industry-wide database and procedures) • Two-year measurement program at EDOP • Measurements with fine resolution in time and space • Squall climate at EDOP should be similar to that at Bonga. • expect 25+ days with significant squall events • expect at least 10 events with winds > 20m/s

  17. The EDOP flare bridge is an ideal “open structure” 370 m long

  18. radar 30 m 24 m 27 m 21 m 18 m • Measure horizontal coherence with 5 sensors over 250 m • Measure vertical profile over most critical elevation range • High sample rate (1Hz) to resolve all pertinent time scales • Doppler weather radar to track squall lines

  19. mast Existing structure guys Added cross piece mast guys Cross-sectional view of bridge with notional set up of instrument masts

  20. Original Schedule • Jun 2002 - select consultants, make reconnaissance trip • Jul 2002 - issue ITT to bidders • Aug 2002 - select contractor • Sep 2002 - submit firm proposal to OPTS • Oct 2002 - declare project a “go” and award contract • Jan 2003 - install instruments • Dec 2004 - complete measurements • Mar 2005 - complete analyses and deliver report

  21. Safety Guidelines for metocean surveys • Issues: • Reduce near-misses while working on vessels • Sea-worthiness of vessels of opportunity • Provide level playing field for suppliers • Help improve standards for companies without metocean engineers • LIP financed by 6 oil companies • Developed jointly with companies and suppliers • In final form, ready for publication as OGP document later Q2/03

  22. Metocean committee activities 2002-4

  23. Metocean committee activities 2002-4 Not the end - other issues?

More Related