The method 1, wherein {TAIL ~ about 0.005 to about 0.4 pore volumes} of {HEAD ~ solution} containing a sacrificial agent is injected into the formation 
The method 1 , wherein { TAIL ~ about 0.005 to about 0.4 pore volumes } of { HEAD ~ solution } containing a sacrificial agent is injected into the formation
OTH OTH OTH OTH OTH TAIL TAIL TAIL TAIL TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH HEAD HEAD HEAD HEAD HEAD OTH OTH OTH OTH OTH OTH OTH OTH OTH