Abstract
Nowadays, energy shortages and global environmental pollution problems are becoming increasingly prominent, and the exploration of clean and renewable energy has become an important direction of energy research. Natural gas hydrates have become the most promising alternative energy source in the future due to its advantages of high calorific value, small environmental hazards and abundant mineral deposits. About 99% of natural gas hydrates are stored in the seabed formation. In 2014, China proposed solid-state fluidized mining technology for marine natural gas hydrates. One of its key technologies is to remove sand from hydrates in real time and backfill the sand on the seabed. Therefore, a downhole axial hydrocyclone suitable for the exploitation of marine natural gas hydrates is proposed in this paper. The purpose of this study is to achieve real-time sand removal and backfilling of downhole hydrate mixed slurry, reduce the sand content of produced fluid, protect the seabed stratum structure, and at the same time reduce the energy consumption of pipeline transportation. In this study, the experimental method was used to evaluate the separation performance of the cyclone with a nominal diameter of 100 mm under different working conditions.
Highlights
The global reserves of natural gas hydrates contain approximately CH4 0.82×1013 -2.1×1015 m3, equivalent to a carbon content of approximately 1×1012 t, the total carbon content is roughly equal to twice the total carbon content of other fossil energy[1]
Natural gas hydrates are known for their rich energy reserves, wide distribution, high energy density and clean combustion, which makes them the most promising alternative energy sources in the future
Marine natural gas hydrate extraction methods are shown in the Table 1.1
Summary
The global reserves of natural gas hydrates contain approximately CH4 0.82×1013 -2.1×1015 m3, equivalent to a carbon content of approximately 1×1012 t, the total carbon content is roughly equal to twice the total carbon content of other fossil energy[1]. Natural gas hydrates are known for their rich energy reserves, wide distribution, high energy density and clean combustion, which makes them the most promising alternative energy sources in the future. Many countries such as the former Soviet Union, Canada, the United States, Japan, China and other countries have launched natural gas hydrate pilot production projects in relevant sea areas. The purpose of this study is to achieve realtime sand removal and backfilling of downhole hydrate mixed slurry, reduce the sand content of produced fluid, protect the seabed stratum structure, and at the same time reduce the energy consumption of pipeline transportation
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