External buoyancy tank helical pipeline heating subsea natural gas collection device and method

Abstract

The invention discloses an external buoyancy tank helical pipeline heating subsea natural gas collection device and method, and relates to the technical field of natural gas collection. The external buoyancy tank helical pipeline heating subsea natural gas collection device comprises a mother ship and a hollow-out natural gas collection cover, wherein a natural gas collection and storage device and pressure supply modules are arranged on the mother ship; the natural gas collection and storage device is connected with the top of the natural gas collection cover through a gas production pipeline; the natural gas collection cover is connected to the bottom of the mother ship through a marine riser; the gas production pipeline is arranged in the marine riser; an anchoring system is arranged around the bottom of the natural gas collection cover; a pressure regulation system is arranged at the bottom of the natural gas collection cover; a temperature regulation system and a stirring system are arranged inside the natural gas collection cover; a propelling system and a density regulation system are arranged on the outer wall of the natural gas collection cover. The external buoyancy tank helical pipeline heating subsea natural gas collection device and method disclosed by the invention mainly solve the problem of dissipation or leakage of natural gas in the decomposed collecting and producing process of natural gas hydrate on a subsea mud bed.

Description

technical field [0001] The invention relates to the technical field of natural gas collection, in particular to the seabed natural gas hydrate collection technology. Background technique [0002] Submarine natural gas hydrate is a crystal formed by the combination of methane gas and water molecules in the low-temperature and high-pressure environment of the seabed. It is a clean energy with huge reserves, and it is expected to replace oil and coal as the main energy source. Gas hydrates are widely distributed in seabed sediments, and have the characteristics of large reserves, weak cementation, and poor stability. Once the temperature and pressure conditions in the area change, it may cause a large amount of decomposition, gasification and free release of seabed gas hydrates. [0003] Since natural gas hydrate is mainly decomposed into methane gas and water, however, methane gas is a greenhouse gas, and a large amount of release into the atmosphere will cause the greenhouse ...

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Problems solved by technology

[0006] The object of the present invention is to: aim at the above existing problems, provide a seabed natural gas collection device and method heated by an external buoyancy tank spiral pipeline, which mainly solves the problem of natural gas hydrate in the seabed mud bed during the process of decomposing, collecting and exploiting , will not cause the problem of the escape and leakage of natural gas. The present invention breaks through the conventional thinking mode and skillfully uses pressure regulation to form a negative pressure and temperature regulation system to increase the temperature to promote the decomposition of natural gas hydrate in the seabed mud bed, which is beneficial to the seabed natural gas. The exploitation of hydrates will greatly increase the recovery rate of natural gas, and provide a new direction for the exploitation of natural gas hydrates on the seabed; it can be seen that the present invention can ensure stable production through the control of density, pressure and temperature, and the natural gas collection is convenient and efficient. High, can be reused many times

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