“… Fig. 10 Kinetic curves of methane amount in hydrate versus time during cooling at 1 K/h (pure H 2 O); color symbols are experimental values for all runs, black circles show the mean curve, gray fill corresponds to the standard deviation of the mean; the first and second digits in the legend reflect the number of cooling-heating cycles and the number of cells; t = 0 corresponds to the intersection of the P-T trajectory and the V–L w –H equilibrium curve for CH 4 –H 2 O (data from [ 20 ]). Fig.…”
“… Fig. 10 Kinetic curves of methane amount in hydrate versus time during cooling at 1 K/h (pure H 2 O); color symbols are experimental values for all runs, black circles show the mean curve, gray fill corresponds to the standard deviation of the mean; the first and second digits in the legend reflect the number of cooling-heating cycles and the number of cells; t = 0 corresponds to the intersection of the P-T trajectory and the V–L w –H equilibrium curve for CH 4 –H 2 O (data from [ 20 ]). Fig.…”
“…In sandy hydrate reservoirs, temperature agitation affecting the phase transition process of hydrates has been studied. Temperature agitation leads to an increase in the potential energy of the movement of water molecules in sandy hydrate reservoirs. , At the same time, temperature agitation can also lead to the thermal dissociation of hydrates, producing large amounts of gas . The presence of temperature agitation also affects the elastic modulus of hydrate reservoirs .…”
Marine hydrate reservoirs are an important form of natural gas, and investigating the permeability of hydrate reservoirs is of great significance for their development. During hydrate exploitation, both water saturation and hydrate saturation dynamically change, inducing a complicated variation in the permeability of hydrate reservoirs. Previous studies lacked specific conclusions on the effects of multiphase saturations on permeability in muddy hydrate-bearing reservoirs. This study remolded 9 cores with different water moisture values (0−14.5%) within a core holder using South Sea Clay and controlled water conversion (0− 61.1%) and hydrate saturations (8.63−42.16%) by the temperature agitation method. Based on Darcy's law, the permeabilities of water/hydrate-containing muddy reservoirs under different saturations were measured. It is found that the permeability decreases with the increase in both hydrate and water saturations, and the dynamic permeability of muddy cores with water conversion to hydrate is K = 40.71•e −41.26•w − (1.65−12.12•w)•χ. By inferring the increase in hydrate saturation at the same decrease in permeability, the ratio of hydrate and water saturations inducing an equivalent change in permeability is found as 1.18. The relationship between the permeability of muddy cores and contained hydrate and water saturations is established as K = 18.1•((1− 1.18•S h − S w )/(1 + 2•(1.18•S h + S w ))) 2.5 . This study is important for the dynamic prediction of the hydrate exploitation process.
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