Advanced Processing of Wave Data for the Oil & Gas

Industry

Dr Mike OsborneManaging Director – OceanWiseMetocean Advisor – Premier Oil

Standard Port-Log

• OceanWise’s environmental data sharing and publishing platform

• Dynamic interface for real time and historic datasets

• Tabular and graphical displays suitable for most purposes

• Now includes functionality for research and engineering

Example from Oil & GasDesign sea states for engineering and operational planning

Hindcast modelling provides industry standard analyses

Measured in situ data essential for: - model verification- short term statistics- spectral parameters

Premier Oil’s Falkland Islands

Sea Lion Field Development

Similar to Central North Sea except:

• Persistent fast moving storms

• Exposed to Wind Sea & multiple Swells

Wind Sea

Swell 1

Swell 2

89% of Seas have a Wind Sea

94% of Seas have a Swell component

60% of Seas have Wind & at least 2 Swells

Data Sources used for Metocean

Studies, Engineering and Planning

• Sources include global and dedicated

hindcast modelling and ‘some’ measured data

• Wind, wave and circulation hindcast

updated according to project need

• Hindcast calibrated using satellite and

in situ data comprising:

• Metocean campaign 1998 (FOSA)

• MODU observations and current mooring

2011 - 2012 (Rockhopper); no wave data

• Wave buoy mooring May 2014 - 2016;

includes levels, temperature and growth

• MODU measurements 2015 & 2016

• Ad hoc float, drifter and CTD data (FIG etc)

Port-Log Advanced Waves Processing

Single or Multiple Sensor Types

Real-time or logged raw or

part processed data from

instrument uploaded to

Port-Log

Port-LogWaves Extension

decodes sensor data, undertakes

spectral analyses and

loads processed data to ODB

ODB stores basic

parameters (e.g. Hs, Tp)

anddirectional

spectra

Basic and Spectral Wave Data

Basic and Spectral Wave Data

Polar and 1D Spectra per Timestamp

Scroll or Select Burst Data from Frequency v Energy Time Series

Partitioning & Spectral Fitting

ODB stores basic

parameters (e.g. Hs, Tp)

anddirectional

spectra

Secondary Processing of Spectral Data

in ODB outputs Wind Sea and

Swell Partitions& Spectral Fitting

Metocean Specialist

Engineers

Partitioned Wave Data and Spectral Fitting e.g. JONSWAP

Multiple peaks indicate Wind Sea and one or more Swells

Theoretical JONSWAP ‘peakedness’ parameter used in offshore engineering design

Partitioned Wave Data and Spectral Fitting e.g. JONSWAP

Energy Per Partition

Turn Partitions On/Off

Summary

Port-Log Waves Extension invaluable to the analysis and presentation of wave data at Sea Lion:

- Verification of model data & design criteria

- Derivation of short-term statistics and spectral parameters as input to engineering

Images and data courtesy of Premier Oil