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362 Enhanced Oil Recovery in Shale and Tight Reservoirs
Figure 12.18 Water production rate (A) and cumulative water production (B) at the
shut-in times of 0 day, 7, 15, and 30 days (Fakcharoenphol et al., 2016).
Figure 12.19 Simulated BHP for 1, 7, and 14 days of shut-in before flow back to
produce the same gas rates. Modified from Bertoncello, A., Wallace, J., Blyton, C.,
Honarpour, M.M., Kabir, S., 2014. Imbibition and water blockage in unconventional
reservoirs: well-Management Implications during flowback and Early production. Paper
Presented at the SPE/EAGE European Unconventional Resources Conference and Exhibition
Held on 25 February. doi:10.2118/167698-PA.
(shorter shut in before flow back) maintains the reservoir energy so that a
higher BHP (lower pressure drawdown) can produce a required gas rate.
Fig. 12.20 shows the BHPs with and without the second shut-in of
1.5 months, when the well produces the same gas rate history shown in
