Decline Curve Analysis

Brief

Decline Curve Analysis DCA is an empirical method for rate decline analysis and rate forecasting published by Arps in 1945 .

DCA is applied for Wells and Reservoirs production forecasting.

Math & Physics

Note	Rate	Cumulative
General form equation	$q(t) = \frac{q_i}{(1+b\ D_i\ t)^{1/b}}$	$Q = \frac{q^b_i}{D_i\ (1-b)} (q^{1-b}_i-q(t)^{1-b})$
Exponential decline, b = 0	$q(t) = {q_i}^{-D_i\ t}$	$q(t) = {q_i}^{-D_i\ t}$