Suspended floating box inner wall heating type seabed natural gas collecting device and method

Abstract

The invention discloses a suspended floating box inner wall heating type seabed natural gas collecting device and method, and belongs to the technical field of natural gas collection. A natural gas storing device is arranged on a mother ship and connected with the top of a natural gas collecting hood through a gas extraction pipeline, the natural gas collecting hood is connected to the bottom of the mother ship through a marine riser, and the gas extraction pipeline is arranged in the marine riser. An anchoring system is arranged on the periphery of the bottom of the natural gas collecting hood, a pressure adjusting system is arranged at the bottom of the natural gas collecting hood, and a propelling system is arranged on the outer wall of the natural gas collecting hood. A plurality of suspension rings are arranged outside the natural gas collecting hood and connected with a density adjusting system through cables, and a temperature adjusting system and a stirring system are arranged in the natural gas collecting hood. By means of the seabed natural gas collecting device and method, the purpose that natural gas cannot dissipate and leak in the decomposition collecting and exploiting process of natural gas hydrates on a seabed mud bed is mainly achieved.

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 purpose of the present invention is to: aim at the above-mentioned existing problems, to provide a seabed natural gas collection device and method for heating the inner wall of the suspended floating tank, which mainly solves the problem of natural gas hydrate in the seabed mud bed. During the process of decomposing, collecting and exploiting, The problem of escape and leakage of natural gas will not be caused. The present invention breaks through the conventional thinking mode, and cleverly uses pressure regulation to form negative pressure and temperature regulation system to increase the temperature, so as to promote the decomposition of natural gas hydrate in the seabed mud bed, which is beneficial to the hydration of seabed natural gas The exploitation of natural gas can greatly improve the recovery rate of natural gas, and provide a new direction for the exploitation of seabed natural gas hydrate; 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 the collection efficiency is high , can be reused many times

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