Fetkovich Type Curve Decline Calculator

Production Decline & Reservoir Depletion: Calculate transient vs boundary-dominated production, Arps decline parameters ($q_i, D_i, b$), and EUR.

Initial Stabilized Rate $q_i$ (bbl/d):

Initial Nominal Decline $D_i$ (%/yr):

Arps Decline Exponent $b$:

Economic Limit $q_{el}$ (bbl/d):

Estimated Ultimate Recovery (EUR)

-- MMbbl

Well Life: -- years

1-Year Rate Forecast

-- bbl/d

Cum 1-Yr: -- kbbl

3-Year Rate Forecast

-- bbl/d

Cum 3-Yr: -- kbbl

5-Year Rate Forecast

-- bbl/d

Cum 5-Yr: -- kbbl

Arps-Fetkovich Depletion Equations:

• Rate: $q(t) = \frac{q_i}{(1 + b D_i t)^{1/b}}$. For $b=0$, exponential $q(t) = q_i e^{-D_i t}$.

• Cumulative recovery: $N_p = \frac{q_i^b}{(1 - b) D_i} [q_i^{1-b} - q(t)^{1-b}]$ ($b \neq 1$).

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