Innovative Geophysical Hazard Survey for Jack-Up Rig Approach and Operating in Hazardous Area of Shallow Seabed Due to Gas Pockets or Entrapped Gas and Tower Integrity Update and Conclusion. A Case Study

Abstract

During a routine tower maintenance visit, gas bubbles were observed at sea bed. The challenge now was to identify the source of the gas leak and identify areas where gas had accumulated. The observed gas seep, escaped from the seabed to the water column and was in the vicinity of the TWR-2 platform as confirmed during a diving survey. A geophysical survey was initiated to understand if gas had accumulated in the subsurface and whether it was safe to approach the site with a rig to kill the well.