关键词: 甲烷水合物, 多孔介质, 碳酸钙, 表面活性剂, 协同作用, 诱导时间

Abstract: The reserves of natural gas hydrate determine its potential commercial development value. Combining the composition of seabed sediments and the seabed environment, the experiments were conducted to study the effect of calcium carbonate as a porous medium and sodium dodecyl sulfate (SDS) on methane hydrate formation under the conditions of 2 ℃ and 6.08 MPa and its mechanism was analyzed. The results show that the gas storage effect and gas storage rate of the two synergistic systems are better than pure SDS solutions. Changes in the particle size of calcium carbonate could change the amount of hydrate formation and gas storage effect, of which 1 mm calcium carbonate has the best gas storage effect. The synergistic system greatly shortens the induction period of hydrates and accelerates the rate of hydrate nucleation. The promotion effect of the synergistic system is reflected in the promotion effect of SDS and the promotion effect of calcium carbonate surface characteristics and particle size changes and its adsorption characteristics. It breaks the micelle effect of SDS and the "solid sealing" effect of hydrates, increases the formation rate of hydrate in heterogeneous heterogeneous environment, and promotes hydrate formation. Therefore, the synergistic system of porous media and surfactant can significantly improve the hydrate generation rate and gas storage effect, and provide a theoretical basis and research direction for the rapid hydrate generation technology.

Key words: Methane hydrate, Porous media, Calcium carbonate, Surfactant, Synergy, Induction time