Wettability Alteration of Sandstone by Chemical Treatments

Figure 2

Oil droplets on the surface of the sandstone cores before and after treatment with FC911.

(a) Oil (without chemical treatment)

(b) Oil (treated with 0.1% FC911, 𝜃=64^∘)

(c) Oil (treated with 0.2% FC911, 𝜃=68^∘)

(d) Oil (treated with 0.3% FC911, 𝜃=74^∘)

(e) Oil (treated with 0.5% FC911, 𝜃=52^∘)

(f) Oil (treated with 1.0% FC911, 𝜃=76^∘)