Fig. 5

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Transient responses of the (a, c) water/gas inlet pressures, (b, d) resistivity index across cumulative segments of the sand column for (a, b) q w = 0.2 mL/min, q g = 10 mL/min, and (c, d) q w = 1.0 mL/min, q g = 2.5 mL/min.