Surveillance and Value Creation   Link with Asset Management Strategy   Uncertainty and Resolution Potential   Surveilla

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Reservoir SurveillancePlanning and Evaluation. Jitendra Kikani. Surveillance and Value Creation Link with Asset Management Strategy Uncertainty and Resolution Potential Surveillance Planning and Value of Information Steps in Monitoring Real Time Reservoir Management. Outline. What is Surveillance?.

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Surveillance and Value Creation Link with Asset Management Strategy Uncertainty and Resolution Potential Surveilla

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3. Surveillance and Value Creation Link with Asset Management Strategy Uncertainty and Resolution Potential Surveillance Planning and Value of Information Steps in Monitoring Real Time Reservoir Management

13. Monitoring Steps

15. Analysis Techniques Single and multiple plots and overlays can provide insight into well and reservoir performance Specialized cased hole logging techniques such as C/O logs can identify fluid contacts and bypassed oil Merge/compare with open-hole logs Differential saturation data from multiple runs Fluid breakthrough analysis can identify mechanics of fluid movement

16. Characteristic changes in production performance of individual fluid phases and/or injection fluid could signify the reservoir mechanisms at play and potential solutionsCharacteristic changes in production performance of individual fluid phases and/or injection fluid could signify the reservoir mechanisms at play and potential solutions

17. Reservoir Monitoring

18. Plots & Analysis Methods Production Decline Curve Analysis Log of Water Cut or Oil Cut Versus Cumulative Production Fetkovich type curves Ershagi Plot (X plot) Dowell-Schlumberger log(WOR) Diagnostic Plot GOR curve

19. Plots & Analysis Methods Pattern Plots Integrating disparate data Injection oil ratio curves Voidage replacement ratios Pattern performance comparison Producer and Injector pair plots

20. Log Diagnostic Plots

21. Log Diagnostic Plots Normal Displacement (Single Layer) straight WOR line with positive slope (derivative) ranging from .5 to 3 cycle/cycle Normal Displacement from Multiple Layers a series of straight WOR lines with positive slopes ranging from .5 to 3 cycle/cycle. A drop, or flattening in WOR, as each successive layer becomes dominant. Normal Displacement with High Perm (Thief) Zone a straight WOR line with high positive slope of 2-4 Coning a rising, curved WOR line that approaches a constant value >1 - the derivative decreases. Near Well-Bore Flow (Channels Behind Casing, etc.) WOR line steeply raises to values >10 and up to 1,000 - derivative sharply increases to extreme values

22. Normal Multi-layer displacement

23. Diagnostic Plot for Coning

24. Permanent Monitoring Systems Surface and/or subsurface monitoring systems can provide valuable information Electronic, wireless and Fiber optic systems are available Coupling with Intelligent Well Systems feasible Pressure, Temperature, Flow-rate, strain and resistivity monitoring possible Powerful Data Mining Techniques can assist in providing knowledge and insights

25. Need for Time Drive Data Instrument errors Measurement errors Interpretation errors Integration errors Dealing with complexities

26. Summary Key to good surveillance practice are Planning Alignment with Asset Objectives Addressing High Risk, High Resolution Potential Data Computing Value of Information Gathering Baseline Data Assign appropriate responsibilities Seamless access and integration with other data Extensive use of disparate types of data with integration and conversion of data to knowledge as a goal

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