AS	reaction surface area (m2)
cp	specific heat capacity (kJ/(kg·K))
ER	energy recovery rate (W)
f	fugacity (Pa)
Fa	area amendment factor
k	dissociation rate constant (kg/(m2·Pa·s))
K	intrinsic permeability (m2)
kΘC	thermal conductivity (W/(m·K))
kΘRD	thermal conductivity of dry porous medium (W/(m·K))
kΘRW	thermal conductivity of fully saturated porous medium (W/(m·K))
kΘI	thermal conductivity of ice (W/(m·K))
m	mass (kg)
nH,diss	mole number of dissociated hydrate (mol)
P	pressure (MPa)
PWell	wellbore pressure (MPa)
qB	heat flow rate across the boundary (W)
QB	total amount of heat transferred from the boundary (kJ)
QH	total amount of hydrate dissociation heat (kJ)
QS	sensible heat increase (kJ)
QS,pro	sensible heat change of the produced fluid (kJ)
QS,res	sensible heat change of the reservoir (kJ)
r, z	cylindrical coordinates (m)
S	phase saturation
t	time (min)
T	temperature (°C)
VP	volume of the recovered methane (L)
ΔEa	activation energy (J/mol)
ΔHm	hydrate dissociation heat (kJ/mol)
Δs	entropy production rate (W/K)
ΔS	entropy production (J/K)
ΔSenv	entropy production of ambient environment (J/K)
ΔSsand	entropy production of quartz sand (J/K)
ΔStotal	total entropy production (J/K)
Δt	duration of exploitation (min)
ρ	density (kg/m3)
ϕ	porosity
ξ	heat utilization efficiency
Subscripts and Superscripts
0	represents initial condition
B	boundary
cap	capillary
eq	equilibrium
G	gas phase
H	solid hydrate phase
irA	irreducible aqueous phase
irG	irreducible gas
n	permeability reduction exponent - Table 2
nG	gas permeability reduction exponent - Table 2
s	sand
W	aqueous water phase