ИСТИНА

Obtaining more data on coalbeds in advance will presumably enhance the whole coal production process. Therefore, there is a need to employ a method of mechanical logging, which is able to provide data on coalbeds, including such parameters as coal seems thickness, depth of a coal seam’s roof, and coal ash content. Since drilling and blasting operations are inevitably used to burst overburden rocks, it would be much more efficient to employ them in extensive and accelerated data extraction. In some cases, the distance between wells reaches up to three meters. If there were a way to obtain well log data from all these wells, it would give an even greater amount of data on coalbeds. Mechanical logging facilitates the extraction of the following data during the drilling process: drilling speed, rotation speed of a drill bit, borehole bottom pressure. Due to certain differences between the mechanical properties of coal and overburden, the drilling process parameters considerably differ. Based on these data, it is possible to predict coal seams parameters and coal ash content, as it is done if using natural radioactivity logging and density-gamma logging. Thus, non-core drilling using mechanical logging appears to be a promising method in opencast coalmining.