3D Analog Simulation for Gas-Liquid Countercurrent in Abandoned Mine Goaf
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Solution Overview
Problem
The complexity of geological structures and mining conditions in abandoned mines makes it challenging to simulate and study the long-term migration and occurrence of gas and water, particularly the evolution of gas enrichment, using existing single plane or traditional analog simulation systems designed for anhydrous and gas-free environments.
Innovation Solution
A three-dimensional analog simulation test system is developed, incorporating a reaction frame, a three-dimensional simulation chamber, a gas supply system, an automatic water pressure control system, and a hydraulic loading system to simulate the gas-liquid countercurrent in abandoned mine goafs, creating a more realistic environment for studying gas and water migration.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If traditional analog simulation systems are used for anhydrous and gas-free environments, then the system structure is simple, but it cannot simulate the complex gas-liquid countercurrent flow in abandoned mines
Solution Approach 1:
The patent transitions from traditional single-plane analog simulation to a three-dimensional simulation chamber that vertically reproduces the caving zone, fractured zone, and curve subsidence zone. This dimensional expansion enables simultaneous simulation of gas-liquid countercurrent flow in multiple spatial dimensions, resolving the contradiction between simulation capability and system complexity.
Solution Approach 2:
The simulation chamber is divided into distinct vertical zones (caving zone, fractured zone, curve subsidence zone) and horizontal zones (coal seam support zone, separation zone, re-compaction zone). This segmentation allows independent control and observation of gas-liquid flow in different geological environments, enhancing adaptability while managing system complexity through modular design.
2Adaptability or versatility
If single plane analog simulation system is used, then the device complexity is low, but it cannot meet the experimental requirements of gas-liquid two-phase countercurrent
Solution Approach 1:
The system employs a three-dimensional simulation chamber with vertical stratification into caving zone, fractured zone, and curve subsidence zone, enabling realistic gas-liquid countercurrent flow simulation that cannot be achieved in single-plane configurations.
Solution Approach 2:
The patent introduces specialized equipment including gas supply systems with controlled injection points, water supply systems with pressure control, and transparent observation windows. These intermediary elements facilitate gas-liquid two-phase flow while maintaining system manageability and enhancing simulation fidelity.
3Ease of manufacture
If ground drilling is used for gas extraction from abandoned mines, then the extraction method is simple, but it cannot effectively address gas-water-rock complex environment
Solution Approach 1:
The patent creates a scaled-down three-dimensional analog model that replicates the complex gas-water-rock environment of abandoned mines. This copy allows systematic study of gas-liquid migration patterns and extraction effectiveness under controlled conditions, providing reliable data that cannot be obtained through simple ground drilling alone.
Solution Approach 2:
The simulation system enables preliminary investigation of gas extraction strategies by modeling different scenarios (varying water levels, gas pressures, rock structures) before actual field operations. This preliminary action optimizes extraction methods and predicts their effectiveness in real abandoned mine conditions.
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 allows for stable and reliable simulation of gas and water pressure, visualization of the seepage process, and identification of main seepage channels, providing insights into gas and groundwater occurrence and stability, which can reduce extraction costs and improve economic benefits for gas extraction enterprises.
Implementation Method 1
The gas supply pipe is uniformly provided with a plurality of first nozzles facing the goaf
Implementation Method 2
a plurality of second nozzles facing the goaf are evenly arranged on the water supply pipe
Implementation Method 3
there is accumulated water in the goaf, which is mainly formed by water in the upper aquifer continuously penetrating into the goaf through the fractured zone
Implementation Method 4
The reaction frame includes a beam, a base and a column connecting the beam and the base
Implementation Method 5
The hydraulic loading system includes a bearing plate, a loading pressure head, a hydraulic pump, a hydraulically loading control cabinet
Implementation Method 6
The automatic water pressure control system includes a buffer tank, a pressure sensor, a nitrogen cylinder, a water supply tank, a water pressure test pump
Data Source
AI summary
A three-dimensional analog simulation test system for gas-liquid countercurrent in an abandoned mine goaf includes a three-dimensional analog simulation device configured to simulate an analog environment of gas-liquid countercurrent in an abandoned mine goaf, a gas supply system, an automatic water pressure control system and a hydraulic loading system. The three-dimensional analog simulation device includes a reaction frame and a three-dimensional analog simulation chamber. The reaction frame includes a beam, a base and a column for connecting the beam and the base. The three-dimensional analog simulation chamber is arranged inside the reaction frame. The test system can be used to simulate the gas-liquid countercurrent in an abandoned mine goaf so as to study the evolution of water accumulation and gas enrichment in long-term abandonment of closed mines and the migration evolution rules of gas-liquid two-phase in abandoned mines with high gas density.