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

Table 17

SASP time table.

Stage	Time	Polymer Mw (million Dalton)	Well head viscosity (cP)	Slug size (PV)
RW	12.2005–06.2006	—	—	0.095
Prepolymer	07.2006–10.2006	15	30	0.054
ASP main	11.2006–06.2007	15	31	0.108
ASP main	07.2007–12.2007	19	65	0.084
ASP main	01.2008–12.2008	25	77	0.159
ASP vice	01.2009–04.2010	25	72–48	0.285
Postpolymer	05.2010–12.2011	25	52–63	0.233