3.2 Sealing characteristics of hydrate–bearing reservoir on external fluids
Hydrate reformation is the reason that sealing effect exists in hydrate–bearing sediments. We increased the hydrate formation rate by increasing reservoir pressure to 4.0 MPa, the characteristics of hydrate–containing sealing layer was investigated, the experimental conditions of Cases 4 and 5 are shown in Table 3. Take the injection volume as the reference value, it was found that high flow rate (Case 5) has hysteresis phenomenon compared with low flow rate (Case 4), but higher flow rate consumed less time.
Table 3. Experimental conditions and results of Cases 4 and 5.