Classic Decline Models Functions

Calculates rate using Arps (1945) decline curve, [L3/T]. Units of volume [L3] and time [T] must be consistent. Use b=0 for exponential, 0<b<1 for hyperbolic, b=1 for harmonic.

Calculates cumulative production using Arps (1945) decline curve, [L3]. Units of volume [L3] and time [T] must be consistent. Use b=0 for exponential, 0<b<1 for hyperbolic, b=1 for harmonic.

Time to reach an economic rate limit for Arps decline, [T]. Returns the time when the production rate falls to the specified economic limit.

Estimated Ultimate Recovery (EUR) to an economic rate limit for Arps decline, [L3]. Returns cumulative production up to the time the rate reaches the economic limit.

Fit Arps decline to rate-time data and return parameters as a column array [Qi, Di, b].

Fit Arps decline to rate-time data with weights and return parameters as a column array [Qi, Di, b].

Calculates rate using modified hyperbolic production decline curve. Units of volume [L3] and time [T] must be consistent.

Calculates cumulative production using modified hyperbolic production decline curve. Units of volume [L3] and time [T] must be consistent.

Time to reach an economic rate limit for modified hyperbolic decline, [T]. Returns the time when the production rate falls to the specified economic limit.

Estimated Ultimate Recovery (EUR) to an economic rate limit for modified hyperbolic decline, [L3]. Returns cumulative production up to the time the rate reaches the economic limit.

Fit Modified Hyperbolic decline to rate-time data and return parameters as a column array [Qi, Di, Dlim, b].

Weighted fit of Modified Hyperbolic decline to rate-time data and return parameters as a column array [Qi, Di, Dlim, b].