Device and method for exploiting seafloor natural gas hydrates through continuously injecting hot seawater

Abstract

The invention provides a device for exploiting seafloor natural gas hydrates through continuously injecting hot seawater. The device comprises a plurality of water supply pipes (1), a plurality of heat radiation pipes (3) and at least one water outlet pipe (2), wherein the inlet end of each water supply pipe (1) is arranged at the offshore plane; the position of the inlet end of each water supply pipe (1) is higher than the sea level; the heat radiation pipes (3) are of cobweb type or hexagonal reticular or branch type or annular structures and are distributed at a seafloor hydrate layer (6); the outlet end of the water outlet pipe (2) is arranged at the offshore plane; the outlet end of the water outlet pipe (2) is flush with or below the water inlet ends of the water supply pipes (1); and the plurality of water supply pipes (1), the plurality of heat radiation pipes (3) and the at least one water outlet pipe (2) are sequentially connected to form a communicator. The hydrostatic transformation principle of the communicator is sufficiently utilized; high-temperature seawater at the sea surface layer is continuously pumped through the heat radiation pipes laid in the seafloor hydrate layer only by a low-power centrifugal pump in an ordinary model. Heat radiation pipelines are of reticular structures, so that the heat radiation efficiency can be improved; the heat radiation area is expanded; and the exploitation efficiency is improved.

Description

technical field [0001] The invention relates to the field of natural gas hydrate exploitation, in particular to a device and method for continuously injecting hot seawater to exploit seabed natural gas hydrate. Background technique [0002] With the development of my country's economy, the demand for energy continues to grow, so it is urgent to develop new energy to meet the needs of my country's rapid economic development. Gas hydrates are ice-like, non-stoichiometric, clathrate crystalline compounds formed under certain conditions when water and natural gas are mixed at high pressure and low temperature. Gas hydrate reserves on the earth are very rich, about 27% of the land (mostly distributed in the permafrost) and 90% of the sea have gas hydrate. Under standard conditions, 1 unit volume of hydrate decomposition can produce up to 164 unit volumes of methane gas, and its energy density is 10 times that of coal. It has the characteristics of convenient use, high combustion...

AI Technical Summary

Problems solved by technology

If a large amount of hydrate reservoirs are to be exploited, huge external heat energy is required, which greatly reduces the economic benefits of exploitation, and even the losses outweigh the gains

Images