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.
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