Gas Lift Diagnostics A New Approach

1. Gas Lift Diagnostics A New Approach Daniel Lucas-Clements Baker Jardine

2. Introduction • Baker Jardine Update • PIPESIM Update • Gas Lift Diagnostic • Gas Lift Diagnostics in Context

3. PIPESIM / Baker Jardine Update • Baker Jardine acquired by Schlumberger April 2001 • Continue to Focus on PIPESIM Suite and ProdMan • Plus Integration with SLB Products e.g. Eclipse, OFM, Finder… • PIPESIM2000 launched. • Development project to rewrite program interface. • Integration under one user interface.

5. Network Analysis • Production Network Modeling Pipeline & Facilities Analysis Well Performance Analysis • Detailed Pipeline Studies • Inflow Modeling, Nodal Analysis Production Optimization Field Planning • System Optimization & Constraint Management • Reservoir & Surface Facility Integration Multilateral Well Simulator • Horizontal & Multilateral Well Models What is PIPESIM 2000 Total System Integration

6. Field Planning Tool • Allows PIPESIM 2000 Well / Network models to be linked with detailed reservoir descriptions • Built-in models: Look-up tables, Blackoil / Compositional Material balance models • Reservoir models: Eclipse 100 / 300 and others • Allows time-stepping of the coupled model through field life • Includes field planning events controlled via an easy to use graphical user interface • Time based events • Conditional events

7. Gas Lift Diagnostics

8. Gas Lift Diagnostics • What is happening down hole? Is my well working correctly? Can my well be more efficient? • What data do I have? • What do I need to correct the problem? • Can I correct the problem without intervention? • Do I need to collect further data? • Can I justify the chosen course of action?

9. Traditional Approach • Analyse well by well – No targeting • Analyse well when new data available • Mostly analyse after Flowing P&T survey • Occasionally analyse with new well test • First analysis leads to more data gathering • Initiates use of chart recorders • Cycle times on well optimisations can be long

10. Production Challenges • The Challenge • Better surveillance • Faster problem diagnosis • Optimum production operations • The Method • Data management • Apply simulation

11. ProdMan Features • Data Management • Well tests, field data, SCADA & DCS data • Automated collection • Presentation and trending to operators • Simulation • Conversion of data into information with PIPESIM 2000 • Automated • Surveillance • Diagnostics • Constraint Management • Real-Time Optimization

12. ProdMan Data Flows DataData Collection Presentation & Analysis => Information to Operators Field Data Production Database ProdMan Well Test Data SCADA Database Production System Models (PIPESIM Suite) SCADA/DCS

13. What’s Changing? • Field Automation • Real time data on Engineers Desk • Cheaper controls for continuous control • People Issues • Fewer operational staff • Monitoring more information • Tend to be “Fire fighting”

14. Typical Well DCS System Interface DCS/ SCADA System Set Point T P P F T P P CH

15. ProdMan Gas Lift Diagnostic • Determine the status of each gas lift valve and how much gas is being passed • Automatic data retrieval • Batch processing to screen large numbers of wells • Analysis capability to diagnose individual wells

16. Gas Lift Diagnostic • Design Philosophy • Use simulation to determine information • Use real-time and offline data • Design system to short list potential problem wells • Allows large numbers of wells to be monitored • Use available data • Increase in data provides enhanced diagnostic

17. Batch Processing • Focus on Wells with Problems

18. Gas Lift Diagnostic Calculations

19. Results stored to database Builds history for well Reporting module Long term

20. ProdMan Gas Lift Diagnostic One Part of ProdMan

21. ProdMan Focus • Production Surveillance • Calculating unmeasured variables • Comparing measured to calculated values • Production Diagnostics • Well test analysis • On-line Gas Lift Diagnostics • Production Optimization • Field wide production optimization • Reacting to hourly changes in equipment availability

22. ProdMan Structure DB PRODMAN DB PIPESIM LAN Suite FIELD DATA MANAGER Applications (ADO,DAO,ODBC,API's) SCADA 1 WAN Functional Modules SCADA 2 MODULE MODULE MODULE ACTIVE X ACTIVE X ACTIVE X COMPONENT COMPONENT COMPONENT TEXT/ Third Party EXCEL Applications MODULE MODULE MODULE ACTIVE X ACTIVE X ACTIVE X COMPONENT COMPONENT COMPONENT PRODMAN DB

23. Other Gas Lift Based Modules • Validation of well tests • Well Performance Analysis Module • Field Wide gas lift optimisation • Constraint calculation • Dual String optimization • Retrieval / Return of data to control system

24. Related Modules • ESP Diagnostic • Data Processing • Process Material Balance • Production Allocation • Long term monitoring • Inflow Performance

25. Conclusions • Automation is multiplying data availability • Analysis must capture value in data • Tools should focus on presenting - • The problems wells • The complete picture to understand the problem • The Challenge – Are you making the most of your data?