PO.DCA.Duong.Prod

Description

Calculates cumulative production using Duong decline model, {L3}. Units of volume {L3} and time {T} must be consistent.

Syntax

=PO.DCA.Duong.Prod(q1, Qinf, a, m, time)

Parameters

Parameter Description
q1 Theoretical rate at t=1, {L3/T}.
Qinf Asymptotic late-time rate q_inf, {L3/T}.
a Intercept constant a (dimension varies with m).
m Slope parameter m, {1}.
time Time, {T}.

Used in Blueprints

Duong Decline Forecast

Decline curve forecast using the Duong model, specifically designed for unconventional reservoirs exhibiting transient linear flow. The Duong model captures the power-law behavior common in tight oil and shale gas wells.

Related Functions

PO.DCA.AKB.Prod(Qi, alpha, beta, time)

Calculates cumulative production using Ansah-Knowles-Buba (2000) semi-analytical decline model for bounded reservoirs. Units of volume {L3} and time {T} must be consistent.

PO.DCA.Arps.Prod(Qi, Di, b, time)

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.

PO.DCA.Duong.D(q1, Qinf, a, m, time)

Calculates instantaneous decline rate D(t) for Duong model, {1/T}. Computed numerically.

PO.DCA.Duong.EUR(q1, Qinf, a, m, Q_econ)

Estimated Ultimate Recovery (EUR) to an economic rate limit for Duong decline, {L3}.

PO.DCA.Duong.Fit(times, rates)

Fit Duong decline to rate-time data and return parameters as a column array (q1, qInf, a, m).

PO.DCA.Duong.Rate(q1, Qinf, a, m, time)

Calculates rate using Duong decline model, {L3/T}. Units of volume {L3} and time {T} must be consistent.

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