Zero Visibility Operations Planning - DrillSafe

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Recommended Solution – <strong>Visibility</strong> (ROV) • Ultra Short Base Line (USBL) positioning beacon on the ROV - ROV’s position can be tracked real time – even if the ROV becomes disoriented or gets lost with zero visibility - USBL beacon on ROV used to position LBL array on the seafloor • Multi-beam Sonar on the ROV - A multi-beam sonar provides a 3D sonar image even in zero visibility 16
USBL vs LBL • Ultra-short Baseline (USBL) systems calculate the position of a subsea target by measuring the range and bearing from a vessel mounted transceiver to an acoustic transponder fitted on the target e.g. ROV. • With Long Baseline (LBL) systems. The baseline is on the seabed instead of the transceiver hence the name ‘Long Baseline’. 17
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: Recommended Solution - Positioning
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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