Page 228 - Handbook Of Multiphase Flow Assurance

Hydrate stability and crystal growth 227

FIG. 10.4 Burning methane hydrate (U.S. Geological Survey, 2016).

of typical density to the pressure exerted from below the overburden by gas released from a
hydrate lens deposit of similar diameter by warming in a confined volume. Gas would be re-
leased as temperature exceeds equilibrium. Geothermal profile of temperature for permafrost
areas may be found in the literature. The upper estimate of the amount of gas released may
be higher as the hydrate deposit could be thicker and the remainder of hydrate could dissoci-
ate without overburden pressure stabilizing it. Hydrate content in lenses is usually high, up
3
3
to 100% hydrate so using the volume of gas released from hydrate of 164 m methane /m
hydrate is not unreasonable. Satellite measurements at time of the craters’ appearance have