Gyroscope and Endoscopic Camera for Coal Mine Gas Borehole Positioning
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Solution Overview
Problem
Coal-mine gas extraction in Chinese coal seams is inefficient due to poor gas permeability, inaccurate borehole positioning, and unstable coal seam conditions, leading to uneven gas extraction and safety hazards.
Innovation Solution
A method involving precise scanning of coal seam profiles, construction of stratum probe boreholes, and adjustment of borehole parameters using gyroscopes and endoscopic cameras to accurately position and design boreholes, ensuring precise gas extraction and avoiding extraction blanking zones.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If small-diameter boreholes are constructed to perform extraction in coal seams with poor gas permeability, then the construction is simple and a quantity of boreholes can be constructed, but the influence range is small and the drainage effect is poor
Solution Approach 1:
The gas extraction system is segmented into multiple small-diameter boreholes distributed across the coal seam area. Each borehole independently extracts gas from its local zone, and collectively they cover the entire extraction region. This segmentation allows simple construction of individual boreholes while achieving comprehensive gas extraction through numerical multiplication of borehole quantity.
2Device complexity
If boreholes are constructed based on the assumption of straight-line trajectories and stable coal seam conditions, then the design process is simplified, but the actual bottom hole point positioning is inaccurate and extraction amounts are misjudged
Solution Approach 1:
A feedback mechanism is implemented where actual borehole trajectory data and bottom hole point coordinates are measured during construction, then fed back to adjust and optimize the borehole design and positioning for subsequent boreholes. This closed-loop approach corrects deviations from assumed straight-line trajectories and adapts to actual coal seam conditions, improving positioning accuracy while maintaining manageable design complexity through iterative refinement.
3Ease of operation
If borehole construction parameters are not adjusted according to actual coal seam conditions, then the construction process is straightforward, but gas extraction blanking zones are formed and safety hazards occur
Solution Approach 1:
The borehole construction parameters (such as drilling angle, depth, and direction) are made dynamic rather than fixed. The parameters are adjusted in real-time based on actual coal seam conditions encountered during drilling, such as variations in coal hardness, seam thickness, and gas pressure. This dynamic adaptation ensures reliable gas extraction by preventing blanking zones while keeping operations straightforward through automated parameter adjustment based on pre-established design criteria.
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
This method enables accurate assessment and extraction of coal-mine gas, reducing gas content and preventing safety hazards by aligning borehole trajectories with actual coal seam conditions, ensuring effective gas control and efficient extraction.
Implementation Method 1
mounting a gyroscope and an endoscopic camera inside a drill bit of the drill
Implementation Method 2
mounting a gyroscope and an endoscopic camera inside a drill bit of the drill
Data Source
AI summary
In a method, a gyroscope and an endoscopic camera are first used to investigate coal-seam strike trend, coal-seam dip trend, and coal-seam thickness data of a to-be-extracted area. According to gas extraction standard requirements of a to-be-extracted area, boreholes are then designed and constructed, and trajectories of boreholes are tracked to obtain a correspondence relationship between designed borehole parameters and actual borehole trajectory parameters. Next, drilling parameters are adjusted according to the correspondence relationship between the designed borehole parameters and the actual borehole parameters to construct boreholes at predetermined borehole locations. Subsequently, the boreholes are connected to an extraction pipeline, and gas extraction flow rates and gas extraction amounts per meter of the boreholes are observed. Eventually, other boreholes are designed and constructed according to the adjusted borehole construction parameters and extraction data. After being constructed, the boreholes are connected to perform gas extraction.