Excel Function
DuongDeclineTime
Description:
Time to reach an economic rate limit for Duong decline, [T]. Returns the time when the rate falls to the specified limit.
Excel Function Syntax:
=DuongDeclineTime(a, m, q1, qInf, econRate)
Parameters:
| Parameter | Description |
|---|---|
| a | Intercept constant a, [1/T]. |
| m | Slope parameter m, [dimensionless]. |
| q1 | Theoretical rate at t=1, [L3/T]. |
| qInf | Asymptotic late-time rate q∞, [L3/T]. |
| econRate | Economic rate limit, [L3/T]. |
Related Theory
1 item
Duong Decline Model for Unconventional Wells
Decline Models
Related Functions
5 items
DuongDeclineCumulative
Calculates cumulative production using Duong decline model, [L3]. Units of volume [L3] and time [T] must be consistent.
DuongDeclineEUR
Estimated Ultimate Recovery (EUR) to an economic rate limit for Duong decline, [L3].
DuongDeclineFitParameters
Fit Duong decline to rate-time data and return parameters as a row array [a, m, q1, qInf].
DuongDeclineRate
Calculates rate using Duong decline model, [L3/T]. Units of volume [L3] and time [T] must be consistent.
DuongDeclineWeightedFitParameters
Weighted fit of Duong decline to rate-time data and return parameters as a row array [a, m, q1, qInf].
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