Stretched Exponential Decline
The stretched exponential decline method is a variation of the traditional Arps method, but is better suited to unconventional reservoirs due to its bounded nature. One of the benefits of this method is that for positive n, t, qi, the model gives a finite value of EUR, even if no abandonment constraints are used in time or rate.
| The Stretched Exponential Production Decline Model | ||
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Defining the differential equation of the model |
| q = |
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Rate expression as a function of time |
| Q = |
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Cumulative production as a function of time |
| EUR = |
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EUR in terms of model parameters |
Note: Reference SPE
papers: 134231, 143666, 137414, 144311, and 135616.
Creating a Stretched Exponential Decline Analysis
To create a stretched exponential decline analysis:
1. Launch an entity for analysis.
2. Click the Decline thumbnail; then select the type of worksheet you want to create.
The worksheet opens in the main window, displaying a plot of the selected well's production data.
3. Add the Stretched Exponential analysis to the worksheet. See Adding an Analysis for additional information.
4. Best fit the analysis to the data by doing one of the following: