Gas Hydrate Formation for Mixtures of Methane+Helium and Ethane+Helium

摘要

Equilibrium conditions of gas hydrates fromed from methane+helium and ethane+helium mixtures are experimentally determined.As the helium concentration in gas mixtures increases,the equilibrium conditions shift to lower temperatures and higher pressures.The experimental data agree with the calculated values from model prediction having the assumption that helium molecules in a hydrate lattice do not contribute to the hydrate stability of gasmixtures.It is suggested that helium rarely contributes to the stability of the gas hydrate at experimental pressures < 10 MPa.