Triaxial Permeation Test System for Multi-Field Gas Coupling
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Solution Overview
Problem
Existing test systems for gas permeation in ultra-low permeability media under multi-field and multi-phase coupling conditions, such as deep geological disposal of nuclear waste, cannot accurately simulate the effects of thermal, water, and mechanical coupling on gas permeability, limiting their ability to measure gas permeation parameters effectively.
Innovation Solution
A test system comprising a triaxial permeation chamber, deformation monitoring apparatus, temperature sensing control apparatus, volume/pressure controller, bias stress loading apparatus, gas injection apparatus, outlet buffer container, and ultra-low permeation flow monitoring apparatus, which allows for precise measurement of gas permeation parameters under thermal-water-mechanics coupling conditions by controlling temperature, pressure, and deformation, enabling accurate simulation of complex geological conditions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If existing test apparatus (constant-volume permeation device, constant volume radial seepage tester, isotropic stress infiltration device) are used, then gas permeability parameters can be obtained, but they cannot simulate the influence of complex conditions such as temperature field and stress field on gas permeability
Solution Approach 1:
The patent merges multiple independent test functions into a single integrated triaxial permeation test system. The system combines temperature control apparatus, stress control apparatus, gas injection apparatus, and flow monitoring apparatus into one unified device that can simultaneously apply thermal, mechanical, and gas pressure fields while measuring gas permeability. This integration allows the system to simulate the complex multi-field coupling conditions (temperature-stress-gas pressure) that exist in deep geological disposal environments, thereby resolving the limitation of existing apparatus that could only test single-parameter gas permeability without simulating complex field interactions.
Solution Approach 2:
The triaxial permeation test system is designed with multi-functionality to perform various test operations simultaneously. It can control temperature through the temperature control apparatus, apply confining stress through the stress control apparatus, inject gas through the gas injection apparatus, and monitor flow through the flow monitoring apparatus. This universal design enables the system to adapt to different test requirements and simulate various field coupling conditions (isothermal, non-isothermal, different stress states), making it versatile for studying gas permeability under diverse geological disposal scenarios.
2Measurement precision
If existing test apparatus monitor flow at the outlet, then macroscopic parameters such as permeability can be obtained, but they cannot qualitatively analyze the gas seepage path distribution in the seepage process
Solution Approach 1:
The patent segments the gas injection and monitoring process into multiple independent functional modules. The gas injection apparatus can inject gas at different locations and at different rates, while the flow monitoring apparatus can monitor flow at multiple outlet points. This segmentation allows the system to trace gas seepage paths by controlling injection at one location and monitoring at multiple other locations, thereby qualitatively analyzing seepage path distribution without requiring a completely complex redesign of the entire system.
Solution Approach 2:
The patent uses gas as an intermediary substance to trace and visualize seepage paths. By injecting tracer gas through the gas injection apparatus and monitoring its movement through the flow monitoring apparatus, the system can indirectly observe and analyze gas seepage path distribution within the rock mass. This intermediary approach allows detailed measurement of seepage characteristics without directly observing internal flow paths, thereby achieving detailed measurement capability while managing system complexity.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The system enables quick and accurate measurement of gas permeation parameters in ultra-low permeability media, providing important engineering insights for applications like nuclear waste disposal, landfill treatment, CO2 capture, and shale gas exploitation by simulating the complex interactions of thermal, water, and mechanical stresses.
Implementation Method 1
temperature sensing control apparatus...controlling temperature
Implementation Method 2
volume/pressure controller...controlling pressure
Implementation Method 3
gas injection apparatus...injecting gas...controlling pressure and volume
Implementation Method 4
ultra-low permeation flow monitoring apparatus...measuring gas flow...monitoring the flow at the outlet
Data Source
AI summary
A test system for measuring the gas permeation parameters of an ultra-low permeability medium in multi-field and multi-phase coupling conditions, comprising a triaxial permeation chamber, a deformation monitoring apparatus, a temperature sensing control apparatus, a volume/pressure controller, a bias stress loading apparatus, a gas injection apparatus, an outlet buffer container, and an ultra-low permeation flow monitoring apparatus. During the test, first applying temperature and triaxial stress control to a rock-soil mass sample; using the gas injection apparatus to inject high-pressure gas into the rock-soil mass sample; after permeation, the high-pressure gas enters the outlet buffer container and the ultra-low permeation flow monitoring apparatus to acquire the gas permeation flow; and, in the test process, the deformation monitoring apparatus can measure the local absolute deformation of the rock-soil mass sample. Full-process monitoring of the gas permeation of an ultra-low permeability medium in multi-field and multi-phase coupling conditions is thereby implemented.