Table 5. Characteristics of Nine Different Selected Foams along with the State of No Foam (Air Alone).

injected fluid	material used	surfactant concentration	salt concentration	pH	foam half-time stability (min)	foam initial height (cm)
air	air
foam 1	air + SDS	1 cmc	0.5 MNaCl	6	375	2.8
foam 2	air + SDS	1 cmc	0.01 M CaCl2	6	310	2.25
foam 3	air + LA-7	0.1 cmc		6	170	1.5
foam 4	air + SDS	5 cmc	0.001 M CaCl2	8.5	150	4.5
foam 5	air + LA-7	5 cmc	0.001 M NaCl	7.5	125	4
foam 6	air + SDS	5 cmc	0.001 M NaCl	6	100	3.5
foam 7	air + LA-7	0.01 cmc	1 M CaCl2	4	25	0.5
foam 8	air + SDS	0.01 cmc	0.001 M CaCl2	2	25	0.4
foam 9	air + SDS	0.01 cmc	0.001 M CaCl2	2	20	0.4