Evaluation and Injection Parameter Optimization for Polymer Flooding with Different Kinds of Profile Control Agents

Table 2

 Prediction on output increment and economic benefit analysis for different PCA flooding.

PCA types	Injection time	Injection rate (PV)	EOR (%)	Output increment prediction (cm)^3	Output (×10^6 RMB)	Input (×10^6 RMB)	Input/output ratio
Compound ion PCA	Before	0.05	0.67	0.49	759.5	320.35	1 : 2.37
		0.10	2.91	2.14	3317	640.7	1 : 5.18
		0.20	3.09	2.27	3518.5	1281.4	1 : 2.75
	Middle	0.10	2.87	2.11	3270.5	640.7	1 : 5.10
	After	0.05	0.46	0.34	527	320.35	1 : 1.65
		0.10	2.03	1.49	2309.5	640.7	1 : 3.60
		0.20	2.58	1.90	2945	1281.4	1 : 2.30
Anionic delay-action cross-linking PCA	Before	0.05	0.49	0.36	558	255.35	1 : 2.19
		0.10	1.83	1.35	2092.5	510.7	1 : 4.10
		0.20	1.95	1.43	2216.5	1021.4	1 : 2.17
	Middle	0.10	1.62	1.19	1844.5	510.7	1 : 3.61
	After	0.05	0.18	0.13	201.5	255.35	1 : 0.79
		0.10	1.76	1.29	1999.5	510.7	1 : 3.92
		0.20	1.70	1.25	1937.5	1021.4	1 : 1.90
Aluminum citrate cross-linking PCA	Before	0.05	0.24	0.18	279	155.35	1 : 1.80
		0.10	1.24	0.91	1410.5	310.7	1 : 4.54
		0.20	1.26	0.93	1441.5	621.4	1 : 2.32
	Middle	0.10	1.40	1.03	1596.5	310.7	1 : 5.14
	After	0.05	0.11	0.08	124	155.35	1 : 0.80
		0.10	0.45	0.33	511.5	310.7	1 : 1.65
		0.20	0.90	0.66	1023	621.4	1 : 1.65