Presentation on theme: "Gas-Lift Surveillance Techniques"— Presentation transcript:
1Gas-Lift Surveillance Techniques Jim Hall, Shell International EPCleon Dunham, Oilfield Automation20 – 30 Participants
2Gas-Lift Surveillance Techniques ObjectivesDeepStableOptimumData gathering / reportingCharge – 95% of data not usedObjectiveCollect key data once per minuteHave “system” check all dataIf well is OK, nothing is reportedIf well is sick (exception), it “calls for help”People use data to troubleshoot problem wellsWhat data is needed?
3Gas-Lift Surveillance Measurements Need Want UseSurfacePinj Y Y GL analysisQinj Y Y GL analysis/controlPwh Y Y GL analysisQliq Y GL optimizationTwh Y Detect change in H2OPfl Y GL analysisTambient Y Twh analysisDownholePwf Y GL optimizationT Y GL analysisQinj Y GL analysis/controlQsinglephase Y GL optimizationTcontinuous Y GL troubleshooting
4Gas-Lift Surveillance Performance IndicatorsTGLR Hydraulic effectivenessIGLR Economic effectivenessFGLR Must be calculatedBS&W What is being liftedOthersWhat if Downhole Instruments FailRun flowing gradient surveyConduct accurate well testCalibrate multi-phase modelUse calibrated model with measured surface data in between surveys and well tests
5Gas-Lift Control Method Control Method Frequency of UseLift gas rateManual CommonAutomatic Fairly commonDownhole1 Very newInjection pressureManual -Automatic RarelyProduction pressureManual Fairly commonAutomatic Very specialized1 If using downhole control, need automatic fallback to surface method