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Gas-Lift Surveillance Techniques Jim Hall, Shell International EP

Gas-Lift Surveillance Techniques Jim Hall, Shell International EP Cleon Dunham, Oilfield Automation 20 – 30 Participants. Gas-Lift Surveillance Techniques Objectives Deep Stable Optimum Data gathering / reporting Charge – 95% of data not used Objective Collect key data once per minute

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Gas-Lift Surveillance Techniques Jim Hall, Shell International EP

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  1. Gas-Lift Surveillance Techniques Jim Hall, Shell International EP Cleon Dunham, Oilfield Automation 20 – 30 Participants

  2. Gas-Lift Surveillance Techniques • Objectives • Deep • Stable • Optimum • Data gathering / reporting • Charge – 95% of data not used • Objective • Collect key data once per minute • Have “system” check all data • If well is OK, nothing is reported • If well is sick (exception), it “calls for help” • People use data to troubleshoot problem wells • What data is needed?

  3. Gas-Lift Surveillance • MeasurementsNeedWantUse • Surface • Pinj Y Y GL analysis • Qinj Y Y GL analysis/control • Pwh Y Y GL analysis • Qliq Y GL optimization • Twh Y Detect change in H2O • Pfl Y GL analysis • Tambient Y Twh analysis • Downhole • Pwf Y GL optimization • T Y GL analysis • Qinj Y GL analysis/control • Qsinglephase Y GL optimization • Tcontinuous Y GL troubleshooting

  4. Gas-Lift Surveillance • Performance Indicators • TGLR Hydraulic effectiveness • IGLR Economic effectiveness • FGLR Must be calculated • BS&W What is being lifted • Others • What if Downhole Instruments Fail • Run flowing gradient survey • Conduct accurate well test • Calibrate multi-phase model • Use calibrated model with measured surface data in between surveys and well tests

  5. Gas-Lift Control Method • Control MethodFrequency of Use • Lift gas rate • Manual Common • Automatic Fairly common • Downhole1 Very new • Injection pressure • Manual - • Automatic Rarely • Downhole1 Very new • Production pressure • Manual Fairly common • Automatic Very specialized • 1 If using downhole control, need automatic fallback to surface method

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