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

Table 18

WASP time table.

Stage	Time	Polymer Mw (Million Dalton)	Well head viscosity (cP)	Slug size (PV)
RW	11.2005–10.2008	—	—	0.7236
Prepolymer	10.2008–03.2009	25	22	0.0801
ASP main	03.2009–05.2011	25	58	0.4284
ASP vice	05.2011–03.2012	25	60	0.2203
Postpolymer	03.2012–04.2013	25	69	0.2384