Page 299 - Enhanced Oil Recovery in Shale and Tight Reservoirs

272 Enhanced Oil Recovery in Shale and Tight Reservoirs

Figure 9.38 (A) air-liquid contact angles, (B) brine contact angle in the oil phase, (C) oil
contact angle in the brine phase (Javaheri et al., 2017).

Figure 9.39 Oil and water imbibition volumes in dry rock samples and oil recovered
from the Amott-type imbibition test (Javaheri et al., 2017).
et al. (2017) did for Duvernay cores. Fig. 9.40 shows that the brine contact
angles for the same batch of rocks were higher, indicating oil-wet; but oil
was recovered from the Amott-type imbibition tests as shown in
Fig. 9.39, indicating water-wet. They interpreted water-wetness because
the brine was able to imbibe into the oil-saturated rock samples in the
Amott-type imbibition tests. Such interpretation may not be valid, because