Difference between revisions of "Decline Curve Analysis"

Revision as of 15:32, 26 October 2017

Decline Curve Analysis DCA is an empirical method for rate decline analysis and rate forecasting published by Arps in 1945 ^[1].

DCA is applied for Wells and Reservoirs production forecasting.

Note	Rate	Cumulative
General form equation ^[2]	$q(t) = \frac{q_i}{(1+b\ D_i\ t)^{1/b}}$	$Q = \frac{q^b_i}{D_i\ (1-b)} (q^{1-b}_i-q(t)^{1-b})$
Gas-oil ratio	Velarde	Velarde, J., Blasingame, T.A., and McCain Jr., W.D. 1997. Correlation of Black Oil Properties At Pressures Below Bubble Point Pressure - A New Approach. Presented at the Annual Technical Meeting of CIM, Calgary, Alberta, 8–11 June. PETSOC-97-93.

↑ Arps, J. J. (1945). "Analysis of Decline Curves". Transactions of the AIME. Society of Petroleum Engineers. 160 (01).
↑ "KAPPA Dynamic Data Analysis (DDA) book".

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 == Math & Physics ==
 <table width="100%" border="1" cellpadding="3" cellspacing="1">
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 <tr>
 <td>General form equation <ref name = DDA/></td>
-<td>:<math>q(t) = \frac{q_i}{(1+b\ D_i\ t)^{1/b}}</math></td>
+<td><math>q(t) = \frac{q_i}{(1+b\ D_i\ t)^{1/b}}</math></td>
-<td>:<math> Q = \frac{q^b_i}{D_i\ (1-b)} (q^{1-b}_i-q(t)^{1-b})</math></td>
+<td><math> Q = \frac{q^b_i}{D_i\ (1-b)} (q^{1-b}_i-q(t)^{1-b})</math></td>
 </tr>