Overview:
• Vibration sensors on offset wells
• Establish baseline “drilling” vibration
• Drill ahead, measuring offset well vibration
• Log changes in vibration relative to subject well
• Calculate “movement” away/towards offset wells
• Generate actual distance to generate RT TC plot
Test results
• Limited physical separation
• GWD main survey reference
• Conductor hammered to refusal
• Baseline vibration taken with pumps on
Conductor driving
• Measured whilst driving conductor
• Drive vs refusal response
• Can refusal be predicted?
....
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Well Avoidance With Vibration Analysis
Ross Lowdown - Schlumberger