Experimental study on methane hydrate phase equilibrium and formation considering silt sand effect
Natural gas hydrate reservoir faces problems such as low temperature and high pressure,high sand production strength,and low efficiency of gas-liquid separation at the bottom,and the fluid in the production well of natural gas hydrates is a methane gas-water-silt sand three-phase flow,with a hydrate blockage risk.Therefore,a methane hydrate reactor was designed suitable for the methane gas-water-silt sand three-phase flow condition,and an experimental study on methane hydrate phase equilibrium and formation was conducted by considering the silt sand effect.The experimental results show that the silt sand can promote heat and mass transfer between gas and liquid.Because of the effect of silt sand,the methane hydrate phase equilibrium curve turns right about 1.0-1.2℃.As the silt sand concentration increases,the hydrate formation rate and the water conversion rate during hydrate formation are increased as well.It shows that the silt sand increases the risk of hydrate blockage in the production line of deep water oil and gas hydrates,which lays a theoretical foundation for developing an efficient hydrate flow management plan.
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