Coal Seam Gas Displacement Using Micro-Nano Bubble Surfactant Injection
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Solution Overview
Problem
Existing hydraulic measures for coal seam gas extraction face challenges such as low extraction efficiency, poor applicability, high gas desorption and emission, and high dust concentrations, leading to safety accidents and harsh working environments.
Innovation Solution
A method utilizing micro-nano bubbles and surfactants for coal seam gas seepage displacement, seepage water locking, and dust reduction, involving liquid injection boreholes, boundary control boreholes, and a micro-nano bubble generator to enhance permeability and wetting properties, thereby improving gas extraction and dust control.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If traditional hydraulic measures (high-pressure water injection) are used for gas extraction, then gas discharge capability is improved, but coal seam permeability improvement is limited and safety accidents increase
Solution Approach 1:
The patent changes the physical-chemical parameters of the injection fluid by adding surfactants and micro-nano bubbles to ordinary water. The surfactant modifies surface tension and wetting properties, while micro-nano bubbles create cavitation and enhance permeability, transforming the fluid from simple water to a complex active medium that safely and effectively extracts gas without causing water inrush or roof collapse
Solution Approach 2:
The patent creates a composite injection fluid combining water, surfactant, and micro-nano bubbles. This composite medium synergistically enhances gas extraction capability while maintaining safety: the surfactant improves wetting and reduces surface tension, micro-nano bubbles create pressure waves and cavitation to open pores, and together they achieve effective gas discharge without the safety hazards of traditional high-pressure water injection
2Productivity
If traditional hydraulic measures are used, then gas extraction is attempted, but extraction efficiency remains low and applicability is poor
Solution Approach 1:
The patent adjusts the chemical and physical parameters of the injection fluid to match different coal seam conditions. By varying surfactant concentration, micro-nano bubble size and concentration, and injection pressure, the system can adapt to different coal types, permeability levels, and gas content, achieving effective extraction across diverse geological conditions without requiring separate methods for each scenario
Solution Approach 2:
The surfactant acts as an intermediary substance that mediates between the injection system and the coal seam pore structure. It reduces surface tension to enable penetration into fine pores, improves wetting to ensure uniform distribution, and facilitates gas release through its chemical interaction with the coal matrix, thereby enhancing both extraction efficiency and adaptability to complex seams
3Productivity
If high-pressure hydraulic measures are applied, then gas discharge is enhanced, but dust concentration increases and working environment deteriorates
Solution Approach 1:
The patent converts the harmful effect of water injection into beneficial dust suppression by adding surfactants that promote water spreading and adhesion. The modified fluid forms a fine mist or film on dust particles, binding them together and preventing resuspension. The micro-nano bubbles enhance this effect through cavitation-induced spray patterns, transforming the water injection process from a potential dust-generating hazard into an effective dust suppression mechanism that improves working 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
Enhances gas extraction efficiency, reduces gas desorption and emission intensity, and decreases dust concentrations, ensuring safer and more efficient coal mining operations.
Implementation Method 1
adding surfactants and water into a preparation container to obtain a surfactant aqueous solution
Implementation Method 2
enhance permeability and wetting properties
Implementation Method 3
enhance permeability
Implementation Method 4
converting the gas into micro-nano bubbles through a micro-nano bubble nozzle
Implementation Method 5
using a pressure pump and a pumping system, injecting the micro-nano bubble surface active liquid coupling medium into the coal seam
Implementation Method 6
realize the desorption speed suppression and emission intensity reduction of the coal seam gas
Implementation Method 7
moistening the coal seam to achieve the reversal of coal seam wetting and increasing the water content
Data Source
AI summary
The present invention provides a method for coal seam gas seepage displacement, seepage water locking and dust reduction. During the injection period, a pressure pump and pumping system are used to control the pressure and pumping flow rate, and a micro-nano bubble surface active liquid coupling medium is used for seepage displacement of coal seam gas, ensuring efficient discharge or extraction of coal seam gas. After the injection is completed, the micro-nano bubbles surface-active liquid coupling medium is stored in the coal seam, and the coal seam is subjected to seepage water locking and dust reduction. Through the seepage displacement, the seepage velocity of coal seam gas is increased. Through the seepage water locks, the desorption rate of coal seam gas is suppressed. Through the dust reduction, the wetting reversal of coal seams can be achieved, and the moisture content is increased, thereby reducing the generation of dust.