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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

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metocean committee 2002 4 activities
Metocean Committee 2002-4 activities

Chris Shaw

Chairman OGP Metocean Committee

Shell International E&P

metocean committee
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

slide4
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
wasp project status
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
analyses
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
ocean turbulence measurements
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
deepstar turbulence program
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
squall measurement and analysis project
Squall Measurement and Analysis Project

winter storm

squall

Squalls are short-lived

but intense

Squalls are

thunderstorms

Squalls tend to form along lines

slide14
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
p rincipal knowledge gaps
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?)
p roposed project
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
slide18
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
slide19
mast

Existing structure

guys

Added cross piece

mast

guys

Cross-sectional view of bridge with notional set up of instrument masts

slide20
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
safety guidelines for metocean surveys
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
metocean committee activities 2002 41
Metocean committee activities 2002-4

Not the end - other issues?

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