1. Chapter 9
Problem Well
Analysis

2. What is Problem Well Analysis?
One of the most important phases of Production Operations
GOAL – determine IF there is a problem and recommend a workover if needed
Analysis is CRITICAL
Workovers = $$$

3. Problem Analysis = Diagnosis
If your elbow hurt you would NOT immediately choose surgery as the solution
Workover = Surgery

4. Key to defining ABNORMAL For example: Well goes off production:
Understanding NORMAL
Key to defining ABNORMAL
For example: Well goes off production:
Mechanical (often)
Other
Wells can often have problems w/o any symptoms
Constant production but under producing

5. Understanding NORMAL Well Analysis Tools Well Performance Curves
Well status maps
Well histories
Well bore sketches
BHP data
Fluid analysis
Fluid levels

6. Well Performance Curves
Note: Onset of water production indicates combination drive

10. Gas Wells Performance curves similar to oil wells
When produced from closed reservoirs:
Graph of P/Z versus Cumulative Production
Extrapolate line to P=0 gives reserve in place estimate
Compressibility, Z, must be used for “real” gases