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

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Presentation on theme: "Metocean Committee 2002-4 activities Chris Shaw Chairman OGP Metocean Committee Shell International E&P."— Presentation transcript:

1 Metocean Committee 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 WASP (West Africa Swell Project) Current turbulence measurement GOM Squall measurement & analysis programme Safety guidelines for metocean surveys New version OWP Weather Forecasting Handbook Programmed satellites for metocean data collection Metocean Committee activities

4 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 West Africa Swell Project (WASP)

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 H s and T p 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 seconds are of interest Associated Turbulence Scales are about 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 Squalls are thunderstorms Squalls tend to form along lines squall winter storm Squalls are short-lived but intense

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 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?) laterally coherent gust laterally uncorrelated gust

16 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 Bonga EDOP

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

18 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 radar 27 m 21 m 30 m 24 m 18 m

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

20 Original Schedule Jun2002- select consultants, make reconnaissance trip Jul issue ITT to bidders Aug select contractor Sep submit firm proposal to OPTS Oct2002- declare project a go and award contract Jan2003- install instruments Dec2004- complete measurements Mar2005- 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 WASP (West Africa Swell Project) Current turbulence measurement GOM Squall measurement & analysis programme Safety guidelines for metocean surveys New version OWP Weather Forecasting Handbook EU project: new configuration for altimeter satellites Metocean committee activities

23 Not the end - other issues? Metocean committee activities


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