Covering type deep-sea mud volcano type natural gas hydrate exploitation system and exploitation method thereof

Abstract

The invention discloses a covering type deep-sea mud volcano type natural gas hydrate exploitation system and an exploitation method thereof. The system and the method are applied to a submarine mud volcano type shallow layer massive hydrate, and according to the occurrence characteristics of the deep-sea mud volcano hydrate, a covering type heat preservation heating method is adopted, the naturalgas hydrate is exploited on the basis of heating of specially designed gas insulation heat shield and hot electrodes, the decomposed hydrate flows into an output well from a perforation hole of the output well under the action of bottom pressure difference, and a pressure reducing device is arranged in the output well to further decompose the hydrate. The system and the method can effectively overcome the defects of small heating range, high energy consumption and low output capacity in heating and exploiting the hydrate, and can greatly improve the exploitation efficiency; meanwhile, the possibility of environmental risk and ecological disaster caused by large-scale submarine excavation in an existing method can be effectively avoided; and in addition, solar energy is utilized on site, the cost is low, the environment is protected, the large-scale high-efficiency economic exploitation of the hydrate is realized, and the application prospects and the value are higher.

Description

technical field [0001] The invention belongs to the technical field of exploration and exploitation of seabed natural gas hydrate resources, and in particular relates to a covered deep-sea mud volcano type natural gas hydrate exploitation system and method. Background technique [0002] Natural gas hydrate (also known as "combustible ice") is an ice-like crystalline compound formed by methane and other hydrocarbon gases and water in a low-temperature and high-pressure environment. Natural gas hydrate can be divided into deep diffusion type and shallow seepage type. Among them, shallow seepage hydrates are usually closely related to many special geological bodies, such as mud diapirs, mud volcanoes, and gas chimneys. [0003] In many sea areas, mud volcano-type shallow surface hydrates are very developed. These mud volcanoes have a diameter of several meters to hundreds of meters, and are several meters to tens of meters above the seabed, and they are filled with huge amount...

AI Technical Summary

Problems solved by technology

But so far, no corresponding method has been proposed for the special structure of mud volcanoes.

At the same time, although the solid-state fluidization method is simple and easy to implement, it requires large-scale excavation on the seabed, which may cause large-scale ecological disasters and environmental disasters, and the risk is uncontrollable; The possibility of environmental risks. At the same time, robotic mining involves many technical difficulties and difficulties. So far, there is no robot that has entered the implementation stage in various seabed mining fields including seabed manganese nodule crusts and metal sulphides. The precedent of the work shows that the mining of submarine robots can still be a conceptual design at the current stage, and there is a long way to go before it can be put into industrial production.

Images