Test device for model of sand well wall static liquefaction induced by hydrate depressurization mining

Abstract

The invention relates to a geotechnical engineering model test device, in particular to a test device for a model of sand well wall static liquefaction induced by hydrate depressurization mining. Thetest device comprises a sealed box with glass on the front side, a hydraulic control assembly, an inflation control assembly, a temperature control assembly, a volume loss control assembly and a dataacquisition assembly, wherein the model box is filled with water, clay and sand from top to bottom, and a mining well is buried on the side close to the glass; the hydraulic control assembly is used for controlling pressure of water in the sealed box; the inflation control assembly is used for supplementing gas for sand to simulate the process of changing saturated sand into gas-bearing sand, andthe temperature control assembly is used for controlling the temperature of the sand in the sealed box; the volume loss control assembly is used for simulating the volume loss when static liquefactionoccurs; the data acquisition assembly is used for acquiring data needed for the test. The device can simulate the static liquefaction instability behavior of the sand well wall in the depressurization mining process of the natural gas hydrate, and has the characteristics of being convenient to operate, simple in structure, accurate in control and the like.

Description

technical field [0001] The invention relates to a geotechnical engineering model test device, in particular to a model box for static liquefaction instability of a sand well wall in the process of reducing pressure to exploit natural gas hydrate. Background technique [0002] Natural gas hydrate is an ice-like clathrate compound composed of water molecules and hydrocarbon molecules under specific conditions. Under standard conditions, a unit volume of natural gas hydrate can release 160-180 volumes of methane gas, and its reserves in nature are huge. , is considered to be the most important alternative energy source in the 21st century, how to exploit hydrate efficiently and safely has become an urgent problem. At present, the mining method with economic significance is mainly based on the depressurization mining method. [0003] At present, the research on depressurization mining technology mainly focuses on how to improve mining efficiency, transportation and pipeline ant...

AI Technical Summary

Problems solved by technology

In order to consider the static liquefaction instability of the sand well wall caused by the depressurization of natural gas hydrate under deep sea conditions, it is necessary to be able to control the water pressure, the gas content of the sand, the temperature of the sand and the volume loss caused by the mining. Related Test Model Devices

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