Zero Visibility Operations Planning - DrillSafe

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Impact of Environment on Operations • ROV Damage - Greater risk of ROV collision and entanglement 12
Solution Criteria • To overcome the potential problems associated with Strong Currents and Zero Visibility a solution had to meet the following criteria; 1. Determine Relative location of equipment on seabed (not absolute location) 2. Wireless inclination measurements on TGB and PGB 3. “Pictures” in a zero visibility environment 4. ROV Friendly 5. Easily Deployable 6. Cost Effective (Stena Clyde spread rate on Petrel-7 ~$25,000/hour) 13
Page 1 and 2: Petrel-7 Zero Visibility Operations
Page 3 and 4: What Causes Zero Visibility at Petr
Page 5 and 6: Seabed Survey Water Depth ~98m LAT
Page 7 and 8: NW Field Seismic Main Line Multiple
Page 9 and 10: Impact of Environment on Operations
Page 11: Impact of Environment on Operations
Page 15 and 16: Recommended Solution - Positioning
Page 17 and 18: USBL vs LBL • Ultra-short Baselin
Page 19 and 20: Operational Challenges • Deployin
Page 21 and 22: Installation of the LBL Array • B
Page 23 and 24: Multi-Beam Sonar • Initial result
Page 25 and 26: Actual Results - Running Casing 25
Page 27 and 28: Acoustic Inclinometers • Inclinom
Page 29 and 30: Lessons • Allow time to field tri

Zero Visibility Operations Planning - DrillSafe

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