Multi-Field Coupling Test System for CO2 Injection Rock Mass Prediction
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Solution Overview
Problem
Current methods lack accurate prediction of the disturbance response of multi-scale rock mass to supercritical carbon dioxide injection, due to insufficient integration of geochemical and physical mechanics, and limited real-time tracking of dynamic changes in porosity, permeability, and seepage mechanics during carbon dioxide storage.
Innovation Solution
A method and system for predicting disturbance responses by conducting chemical and physical response predictions under varying pressures, temperatures, and injection scenarios using nuclear magnetic resonance and CT scanning rock multi-field coupling mechanics test systems, along with numerical simulations to analyze cross-scale spatio-temporal evolution processes in rock mass structures.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If traditional laboratory tests are used to study rock mass response to CO2 injection, then the testing process is simple and straightforward, but real-time visual tracking of multi-scale fracture evolution and gas-liquid migration cannot be achieved
Solution Approach 1:
The patent combines multiple testing systems (NMR, CT scanning, acoustic emission, digital image correlation) into an integrated multi-field coupling test system. This merging enables simultaneous real-time monitoring of fluid distribution, fracture evolution, and mechanical response, achieving comprehensive visual tracking that traditional single-method tests cannot provide.
Solution Approach 2:
The test system is designed with multi-functionality, where a single integrated platform performs diverse functions including NMR fluid distribution monitoring, CT structural imaging, acoustic emission detection, and digital image correlation measurement. This universal system replaces multiple separate traditional testing apparatus, enabling comprehensive real-time tracking across different scales and physical fields.
2Quantity of substance
If research focuses on single fracture characteristics, then the study is simple and manageable, but the response law of complex fracture networks in rock mass cannot be reflected
Solution Approach 1:
The patent implements a nested experimental design where micro-scale fracture characteristics are studied within the context of meso-scale and macro-scale fracture networks. The testing system captures hierarchical structures from individual fracture behavior to complex network evolution, allowing single fracture mechanisms to be understood within the broader context of multi-scale fracture networks.
Solution Approach 2:
The patent transitions from studying fractures in isolation to examining complex fracture networks by adding spatial dimensions and multi-field coupling. The integrated testing system monitors three-dimensional fracture network evolution, fluid migration paths, and stress field distribution simultaneously, capturing the complexity of interconnected fracture systems rather than isolated fractures.
3Measurement precision
If integration of geochemical reaction and physical mechanics is not performed, then the research methodology is simpler, but accurate prediction of dynamic changes in porosity, permeability and seepage mechanics parameters cannot be achieved
Solution Approach 1:
The patent merges geochemical reaction monitoring with physical mechanics testing in an integrated multi-field coupling system. The system simultaneously measures chemical parameters (pH, mineral dissolution) and mechanical parameters (stress, strain, porosity, permeability), enabling accurate prediction of how geochemical processes affect seepage mechanics properties during CO2 injection.
Solution Approach 2:
The testing approach uses composite monitoring methods that combine multiple measurement techniques (NMR for fluid distribution, CT for structural changes, acoustic emission for fracture detection) to create a comprehensive picture of rock mass response. This composite methodology accurately captures the coupled geochemical-physical mechanics processes that govern porosity and permeability evolution.
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
Enables quantitative analysis and dynamic prediction of physical property changes, fracture evolution, and gas-liquid migration in multi-scale rock mass, supporting the evaluation of carbon dioxide storage suitability and establishing a foundation for a dynamic prediction model.
Implementation Method 1
nuclear magnetic resonance and CT scanning rock multi-field coupling mechanics test systems
Implementation Method 2
nuclear magnetic resonance and CT scanning rock multi-field coupling mechanics test systems
Implementation Method 3
acoustic emission system
Implementation Method 4
digital image correlation system
Data Source
AI summary
The present disclosure relates to a method and system for predicting a disturbance response to an injection of carbon dioxide into a multi-scale rock mass. The method includes: predicting a disturbance response to an injection of supercritical carbon dioxide into a multi-scale rock matrix; predicting a disturbance response to an injection of supercritical carbon dioxide into a multi-scale rock mass structure; and predicting a disturbance response to an injection of supercritical carbon dioxide into a multi-scale rock matrix-rock mass structure system. The method in the present disclosure can accurately analyze a cross-scale spatio-temporal evolution process of the multi-scale rock mass and seepage mechanics under disturbance of the injection of supercritical carbon dioxide.