WAVI-VSP service reduced reduced drilling risks Challenges • Formation pressure hazard • High individual well cost (>$200 million USD) • Hard-to-interpret surface seismic • Formation depth uncertainties • Excessive safety risk Results • Pre-survey modeling verified borehole seismic would reduce risk • WAVI-VSP service provided superior data over standard VSP • Survey operation plan and operation were performed smoothly • Results were available 12 hours before drilling operations restarted • Subsequent drilling confirmed depth formation estimates with six times less error • All well liners set in the target formation with safe standoff from high reservoir pressure A North Sea operator was working on a large gas field with difficult drilli

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