Exponential Integral Functions
Description
Demonstrate the exponential integral (Ei) function used in pressure transient analysis and well test interpretation.
Exponential Integral (Ei):
- Ei(x) = integral from -inf to x of (e^t / t) dt
- Critical for line-source well solutions
- Used in calculating pressure drawdown and buildup
PTA Applications:
- Ei(-1/(4*tD/rD^2)) appears in the line-source solution
- For tD/rD^2 > 25, can use logarithmic approximation
Spreadsheet Preview
25 rows x 3 columns
How to use this blueprint
- In Excel, go to the Petroleum Office ribbon tab and click Blueprint Manager
- Search for Exponential Integral Functions
- Click on the blueprint to preview the spreadsheet template
- Click Insert to place it into your worksheet. Modify the input values to match your data.