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
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Required Functions
Blueprint ID
po.utilities.math.functions