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Huff-n-puff injection in shale gas condensate reservoirs     113





























              Figure 4.28 Component mole fractions at Block (10,1,1) for methane injection into a
              core of Fluid A.



                      12

                      10
                     Butane percentage,%  8 6






                       2 4

                       0
                        0       1       2       3      4       5       6
                                           Cycle number
                  Figure 4.29 Butane content after primary depletion and huff-n-puff cycles.

                 Meng and Sheng (2016b) did huff-n-puff experiments using a mixture of
              15% butane and 85% methane. At the end of primary depletion, the butane
              content in the produced stream was 2% (Fig. 4.29). It increased during the
              first cycle because of revaporization as the pressure was increased. At later
              cycles, it decreased as less butane was available and more methane flowed
              into the production stream.
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