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.