Guyana Offshore Real-time Metocean Monitoring System

ExxonMobil contracted with RPS to conduct a multi-year, multiple mooring and Mobile Operational Drilling Unit (MODU) based, real-time met-ocean observation system, in the rigorous offshore conditions off the coast of Guyana, South America.

RPS Metocean in Houston teamed with RPS Metocean Perth and vessel and crew contractors in Trinidad and Guyana, respectively to perform the project. RPS designed, constructed and tested all of the equipment in our facilities in Houston and Perth, shipping them to a Trinidad staging area for final assembly, testing, and deployment.

Five moorings were deployed at various locations, in water depths of approximately 1760 m, in the Liza 1 prospect, permitted met-ocean instrument placement areas to measure the following parameters: 

Offshore Oceanographic Characterizations: 

  • Waves (Hs, direction, period) 
  • Current Profiles (intensity, direction) 
  • Tides (constituent amplitude, phase)  
  • Temperature, Salinity, & Density Profiles 
  • Corrosion testing 
  • Marine growth 

Offshore Meteorological Conditions: 

  • Wind (intensity, direction)  
  • Air temperature 
  • Precipitation  
  • Relative humidity 
  • Sunlight 
  • Atmospheric pressure 

Timeline

  • 2016

    RPS started the project in January 2016.

  • 2016

    The system design was completed in February 2016.

  • 2019

    This project is ongoing.

1 /03
2016

RPS started the project in January 2016.

2016

The system design was completed in February 2016.

2019

This project is ongoing.

Key Details

Project Name

Guyana Offshore Real-time Metocean Monitoring System 

Client

ExonMobil

Sector

  • Oil and gas

Location

  • Offshore Guyana, South America

Services Provided

  • Metocean data collection 
  • Deep water current profile moorings 
  • Real time metocean buoy mooring 
  • Mobile Operational Drilling Unit based and bottom mounted real time current profile

Challenge

Mooring design for deployments in the deep ocean environment provides numerous challenges including the harsh offshore conditions, deep ocean pressures on the instruments, and remoteness of the systems making servicing difficult. In addition, the project was offshore of Guyana South America creating logistical issues equipment staging and deployment vessel provision. The ocean circulation in the region is complex reflecting the strong north west flowing North Brazil Current along the near surface, and the south ward flowing North Atlantic Return Flow at mid and bottom depths.  

ExxonMobil Guyana Metocean Moorings 2.png

Solution

Four of the moorings were subsurface taut line systems measuring full water column currents, salinity and temperature.  The final mooring has a surface met-ocean buoy, measuring waves, currents and meteorological parameters, with real-time satellite communications. The MODU has surface and bottom current meters, communicating via subsurface modem for a real time full water column current profile. The combined met-ocean data stream is available to operators, ExxonMobil metocean analysist and RPS personnel for review and analysis. A daily met-ocean bulletin is automatically generated and sent to the client, characterizing the meteorological conditions and the full water column current profile, to help guide their daily operational activities. 

Project Statistics

4
subsurface taut line moorings
1
real-time metocean buoy mooring
15
acoustic doppler current profilers
>8 km
mooring cable
4
month servicing interval
9
deployments to date

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