Alkali Effect on Alkali-Surfactant-Polymer (ASP) Flooding Enhanced Oil Recovery Performance: Two Large-Scale Field Tests’ Evidence

Table 16

Actual injection scheme.

	Preslug		ASP main slug				ASP vice slug				Postslug
	Size	P	Size	A	S	P	Size	A	S	P	Size	P
	(PV)	(mg/L)	(PV)	(%)	(%)	(mg/L)	PV	(%)	(%)	(mg/L)	(PV)	(mg/L)
SASP	0.054	1300	0.351	1.2	0.3	2000	0.285	1 0.8	0.2 0.1	2000	0.233	1500
WASP	0.0801	1350	0.4284 (0.3501)	1.2	0.3	1750 1980	0.2203	1.0	0.1	1940 1980	0.25	1500