Visible large-scale telescopic well fluid-solid-heat coupling natural gas hydrate exploiting experimental simulation device and method

Abstract

The invention belongs to the technical field of ocean natural gas hydrate exploiting, and relates to a visible large-scale telescopic well fluid-solid-heat coupling natural gas hydrate exploiting experimental simulation device and method. The telescopic well fluid-solid-heat coupling natural gas hydrate exploiting experimental simulation device comprises five parts, namely, a large-scale hydrate reaction system, a flowing injection system, a three-well fluid-solid-heat coupling exploiting and collecting system, a micro-visible system and a data detecting and collecting system. A depressurizingexploiting method, a heat injection exploiting method and different-mode water flow erosion methods can be flexibly combined, the actual exploiting process is simulated, and the telescopic well fluid-solid-heat coupling natural gas hydrate exploiting experimental simulation device and method are provided. The telescopic well fluid-solid-heat coupling natural gas hydrate exploiting experimental simulation device and method are used for exploring the exploiting characteristics when different exploiting methods, namely, modes are combined. Reliable experiment bases and theoretical analysis are provided for efficient and continuous commercial exploiting of the hydrate.

Description

technical field [0001] The invention belongs to the technical field of marine natural gas hydrate exploitation, and relates to a thermal-fluid-solid coupled natural gas hydrate exploitation experiment simulation device and method for a telescopic well with a large visible scale. Background technique [0002] Gas hydrate is an ice-like solid compound formed by natural gas (mainly composed of methane) and water under high pressure and low temperature conditions. Hydrate deposits are widely distributed in terrestrial permafrost environments and deep-water formation environments such as oceans and lakes. As an alternative new energy source, natural gas hydrate has high energy density, large reserves, huge resource potential and broad development prospects. With the increasing demand for natural gas in my country, the research on its exploitation is particularly urgent. Gas hydrate is a metastable mineral. Once the occurrence conditions change, the phase balance of gas hydrate r...

AI Technical Summary

Problems solved by technology

The depressurization method is the most economical, effective and simple mining method. The main disadvantage is that the latent heat of hydrate decomposition phase change causes a local temperature drop, which may cause the secondary formation or freezing of hydrate, which affects the long-term mining efficiency; the disadvantage of the heating method It is not only to provide heat for hydrate decomposition and phase transition, but also to heat sediments, pore gases and liquids. The heat loss is large, the efficiency is low, and the cost is high

Images