Permanent Monitoring Systems for Seabed Leakage Detection

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Courtesy of Franatech GmbH

Seabed leaks
Where do they come from?

  • Natural vents: Faults, Pockmarks, and Chimneys
  • Melting hydrates
  • Shallow gas layers
  • Long term leakage along well casings (cracked cement)
  • Injection: fault re-activation/fracturin
  • Lost well control nd failing barriers

The mysterious pockmarks at the Troll field
Footprints from melted hydrate lumps (after the last glacial period)

Characteristics of Seabed Gas Leaks

Monitoring solution for Permanent seabed leakage detection in the vicinity of production facilities:

Traces and Features:

  • Gas bubble trains or plumes
  • Concentration of dissolved gas
  • Seabed currents

Instrumentation

  • Sonars
  • Sniffers
  • Current meters

Sonar gas leak detection

  • Multibeam or Scanning sonar?
  • Aspect and detection capability
  • Point of View, backscatter and acoustic shadows
  • Automatic detection - Filterinq and identification

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