Abstract
Gas hydrates are non-stoichiometric crystalline compounds that consist of host water molecules to form cages through hydrogen bond and hydrate formation gas molecules to fill inside, and thus stabilize the crystal lattice by weak van der Waals forces. Hydrate formation gas molecules, also called as guest molecules can be methane, ethane, propane, carbon dioxide and so on which are suitable in sizes for being adsorbed in water cages. Natural gas hydrates in deep water are the unconventional natural gas resources with wide development prospects. Pipeline transportation is the key point to realize the development and utilization of natural gas hydrate resources. During the transportation, the pressure and temperature in the pipelines would change continuously which lead to the complex gas-liquid-solid three-phase flow coupled with natural gas hydrates formation and decomposition. In this paper, research progress in four main aspects were analyzed which included the distribution conditions of natural gas hydrates resources in the world, the methods of exploitation, the kinetics of natural gas hydrates formation and decomposition and the gas-liquid-solid multiphase flow. Based on the four aspects, the safety of natural gas hydrate pipeline transportation in deep water was analyzed.
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