Zero Visibility Operations Planning - DrillSafe

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2D Sonar vs Multi-Beam Sonar 2D Sonar Multi-Beam Sonar 18
Operational Challenges • Deploying LBL array - Soft Seabed - ROV friendly Bucket Structures - Accurate Positioning • Acoustic Inclinometer Installation - Modify TGB and PGB to house Inclinometer - Perform full Dimensional Check - ROV Friendly • ROV Modifications - Multi-beam Sonar installation and checks - Installation of a positioning beacon 19
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 and 12: Impact of Environment on Operations
Page 13 and 14: Solution Criteria • To overcome t
Page 15 and 16: Recommended Solution - Positioning
Page 17: USBL vs LBL • Ultra-short Baselin
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

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