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Speculum Observation and Trajectory Measurement in Gas Extraction . . . Through peeping at the coal seam, upper adjacent layer, lower adjacent layer, and high-level gas drainage boreholes, the results show that the integrity of the boreholes in the coal seam is well There is no obvious macrocracks, but there is water accumulation
Analysis of the Risk of Water Breakout in the Bottom Plate of High . . . mining of extra-thick coal seams in the western mining area Therefore, this paper adopts the methods of theoretical calculation, micro-seismic monitoring, and borehole peeping to analyze the danger of water brea-kout on the bottom plate of 2202 comprehensive workings as the research object
Analysis on Peeping Image Enhancement of Coal Mine Borehole Based on . . . According to the characteristics of wavelet packet decomposition and reconstruction, an image enhancement method is put forward by decomposing wavelet packet and adjusting enhancement coefficient of band signal by the energy size
5 Coal Mine Borehole Stock Photos, Images Pictures - Dreamstime Download Coal Mine Borehole stock photos Free or royalty-free photos and images Use them in commercial designs under lifetime, perpetual worldwide rights Dreamstime is the world`s largest stock photography community
Slimline Borehole Logging with Acoustic Image Aided Mine Development . . . Weatherford field personnel deployed the slimline acoustic image tool to obtain the raw data The high-quality raw data was processed and generated the image log The interpretation was focused on identifying coal seams, structural analysis, fracture identification, and stress directions
The Drainage Horizon Determination of High Directional Long Borehole . . . In order to analyze the development of fracture at different heights, so as to determine the fracture zone of the overlying strata on the roof, the borehole images of the same borehole with the advance of the working face in different periods and depths are intercepted, as shown in Figures 9 and 10