Page 192 - Enhanced Oil Recovery in Shale and Tight Reservoirs
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Fluid-rock interactions 175
Figure 8.2 Barnett Shale with clear fractures parallel to the bedding after immersion in
distilled water.
Mancos Barnett Marcellus Eagle Ford
Figure 8.3 What Mancos, Barnett, Marcellus, and Eagle Ford samples looked like in
water.
The oil recoveries from the Mancos, Barnett, Marcellus, and Eagle Ford
samples exposed to fresh water are presented in Fig. 8.4. The recovery factor
of Mancos was the highest (59%) among all the samples, because the samples
were fragmented, and it was easier for oil to come out of the shale sample.
60
40
R.F , %
20
0
0 2 4 6 8 10
Time , days
Barnett Eagle Ford Mancos Marcellus
Figure 8.4 Oil recovery factors (RF) in spontaneous imbibition in fresh water from the
Barnett, Eagle Ford, Mancos, and Marcellus shale samples.