A subsea natural gas hydrate production system and method

Abstract

The invention discloses a seafloor natural gas hydrate mining system and method, and belongs to the technical field of new energy mining. The system comprises a natural gas hydrate mining device, a driving device, a natural gas hydrate purifying device, a seafloor pressurizing device, a pumping lifting device, an L-shaped pipeline and a collecting ship; the natural gas hydrate mining device comprises a cutter suction mining device and a flow jetting mining device; the mining method comprises the steps of driving mining of a suction vehicle, pressurizing of the seafloor pressurizing device, pressurizing mining of the flow jetting mining device, purifying of natural gas hydrate, mud and sand refilling, lifting of the pumping and lifting device and the collection of the collecting ship; a coarse separating device is arranged in the cutter suction mining device. The method in which two mining manners are combined is adopted, mud and sand in the natural gas hydrate are removed while miningis conducted, each working procedure is operated independently, the recovery ratio of natural gas hydrate is effectively improved, and the system has better application prospects.

Description

technical field [0001] The invention relates to the technical field of new energy exploitation, in particular to a seabed natural gas hydrate exploitation system and method. Background technique [0002] Natural gas hydrate (combustible ice) is a clean and efficient new energy source with large storage capacity. It is widely distributed in deep sea sediments or permafrost on land. It is an ice-like ice-like gas formed by natural gas and water under high pressure and low temperature conditions. crystalline substance. The total amount of natural gas hydrate resources in the world is equivalent to twice that of known coal, oil and natural gas in the world, which can meet the current demand for energy markets. It will be the most important energy for mankind in the 21st century. [0003] Both at home and abroad, the mining of natural gas hydrate is accelerating and deepening research. The existing methods for mining combustible ice of natural gas hydrate include: pyrolysis met...

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Problems solved by technology

[0006] In view of the above problems, the present invention provides a subsea natural gas hydrate mining system and method, aiming to solve the problem that the existing subsea natural gas hydrate mining technology is not suitable for joint mining of the shallow seabed and the seabed surface, the mining range is limited, and it cannot be carried out on the seabed. The defect of separation seriously restricts the development of the field of subsea natural gas hydrate exploitation

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