Testing device and testing method for simulating mechanical properties of marine energy soil-well interface in hydrate exploitation process

Abstract

The invention belongs to the field of marine energy soil exploitation mechanical testing, and particularly relates to a testing device and a testing method for simulating mechanical properties of a marine energy soil-well interface in a hydrate exploitation process. The testing device comprises a triaxial pressure chamber, a stress loading system, a gas supply pressurization system, a water bath water tank, a soil-well interface sample, a back pressure valve, a gas-liquid separation and recovery system and a data acquisition system, wherein the stress loading system is connected with the triaxial pressure chamber to realize loading in different stress modes; the gas supply pressurization system is connected with the triaxial pressure chamber to provide a gas source and control the application of gas pressure to generate a hydrate; the water bath water tank system seamlessly surrounds the triaxial pressure chamber to control the indoor temperature; an exploitation well interface is spliced with a soil body sample and is arranged in the triaxial pressure chamber to simulate the mechanical properties of the soil-well interface in the exploitation process; and a data transmission and acquisition processor is connected with the triaxial pressure chamber, a high-pressure gas pump, a confining pressure loader, an axial pressure loader, the water bath water tank and the back pressure valve respectively, and is used for acquiring test data at regular time and storing and processing the test data. According to the testing device and the testing method, the synthesis of natural gas-containing hydrate soil is realized, the high-temperature and low-pressure decomposition time of the hydrate is controlled, and the shearing characteristics between the marine energy soil-well interface in the hydrate exploitation process can be accurately tested.

Description

technical field [0001] The invention belongs to the field of mechanical testing of marine energy soil mining, and in particular relates to a testing device and a testing method for simulating the mechanical properties of the marine energy soil-well interface in the process of hydrate mining. Background technique [0002] Natural gas hydrate is a new type of clean energy. According to the estimation of the Ministry of Land and Resources, there are very rich hydrate resources in the East my country Sea, South China Sea and their adjacent waters. Gas hydrates are usually formed in loose sediments in deep-water shallow overburdens, which have the characteristics of poor cementation and low strength, and in the process of deep-sea mining, the phenomenon of soil-well interface weakening occurs: gas hydrate overlays are resistant to The soil-structure interface softens under the cyclic load of the uplifted structure; the soil-well interface will liquefy under the action of deep sea...

AI Technical Summary

Problems solved by technology

At present, most studies on the mechanical properties of soil-structural surfaces are carried out through direct shear instruments, which cannot simulate the production process of natural gas hydrates.

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