Deep sea seabed natural gas hydrate collection method and production greenhouse

Abstract

The invention belongs to the technical field of natural gas hydrate collection, and discloses a deep sea seabed natural gas hydrate collection method and a production greenhouse for the first time. The collection method comprises the steps of determining an active methane leakage area near a land distribution boundary in a seabed hydrate stable area, obtaining seabed methane leakage in-situ observation data, determining a methane leakage rate, and evaluating the economical efficiency; installing the production greenhouse on the seabed, after installation is completed, starting a monitoring system, monitoring the seabed methane leakage condition and the hydrate generation progress in real time, evaluating the hydrate generation amount, and conducting hydrate collection work; and rapidly processing natural gas hydrate in the greenhouse through a natural gas hydrate collecting system of an offshore platform, and continuing to monitor the methane leakage condition. A large amount of methane leaked from the seabed can be collected through a pollution-free collection system; and methane leaked from the seabed can be prevented from entering seawater and even atmosphere to cause serious environmental and climatic influences, and the method has dual significance in resources and environment.

Description

technical field [0001] The invention belongs to the technical field of natural gas hydrate collection, and in particular relates to a deep-sea submarine natural gas hydrate collection method and a production greenhouse. Background technique [0002] At present, there is a large amount of methane stored in marine gas hydrates, and its estimated geological reserves exceed the total known gas geological reserves on land in the world, so it is considered as a clean alternative energy in the future. In addition to providing a large amount of clean energy, natural gas hydrate is considered to be a potential threat to marine ecology due to its shallow burial depth, poor stability, and the fact that the methane contained in it has a stronger greenhouse effect than carbon dioxide. Ocean acidification) and global warming. In recent years, the "greenhouse effect" and "global warming" have become hot topics of concern around the world. Many scholars believe that methane leakage caused ...

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Problems solved by technology

[0007] It is difficult to control the process of inducing the decomposition of natural gas hydrate by reducing the pressure or increasing the temperature. If the decomposition speed is too fast, a large amount of fluid will be released, which will affect the shear strength of the sediment, thereby causing disasters such as submarine landslides and damage to submarine engineering; , most of the current research on seabed methane seepage is to describe its characteristics, scope, flux and controlling factors, but what people can do about the characteristics of seabed methane seepage has not yet been studied

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