Shazhko Y. Parameters substantiation in method of methane content estimation in the coal beds in bottomhole

In the thesis theoretically investigated a process of methane desorption from coal to a closed volume, which takes into account the diffusion and filtration flows of gas from the pores and cracks. The thesis justifies the physical model of the coal substance, which includes closed pores and cracks, connected with open pores (filtration volume). Pressure of the gas, which accumulates over the outflowing from filtration and diffusion volumes of broken away from a massif coal particles, situated in accumulating container, is directly proportional to the pressure of the gas contained in the unharmed coal seam, porosity, volume fraction of the coal, and the square root from the parameter, which takes into account the ratio of the fractions selection time before the container sealing and the time of desorption process measurement, and inversely proportional to the volume of the container. On the basis of the estimated regularities, the parameters of the method for the coalbed methane content evaluation in the bottomhole have been developed. Desorption characteristics of coal seams was composed consisting of two parts - the dependence of intensity of methane desorption from the equilibrium gas pressure value in coal saturation by methane; and the dependence of methane quantity in coal from its saturation pressure. A pilot sample of measurer for the pressure and the amount of methane in the coalbed - desorbometer DS-03 has been developed. The method for determining the pressure and the amount of methane in the coalbed directly in mines has been developed.