METHOD OF DETERMINING GAS CONTENT OF COAL BEDS Russian patent published in 2016 - IPC G01N7/00 E21C41/18 

FIELD: measurement technology; gas industry.

SUBSTANCE: invention relates to methods of determining gas content of coal beds in order to determine potential of commercial coal deposits for production of methane from coal beds, as well as for calculation of expected gas abundance of mine workings of coal mines. Method of determining gas content of coal beds involves collecting samples of a coal core from a coal bed using detachable core-gas collectors, after lifting core-gas collector at wellhead, collecting gas from gas collector, core barrel with a sample of a coal core is separated from core-gas collector and sealed with plugs. Further, sample of coal core is placed in thermostat, tuned to temperature equal to temperature of formation from which samples were taken. Volume of stripped gas is determined using a measuring cylinder or measuring burette with equalising bulb, lost gas volume by constructing a desorption curve and projection of previously obtained values of desorption back to beginning of time, and determining residual gas in coal in three modes of degassing until complete extraction of gas: at 60-90 °C, at thermal evacuation with heating to 60-90 °C, after grinding a sample in a ball mill at 60-90 °C and evacuation. Overall gas content level is determined as a sum of volumes of lost, stripped and residual gas.

EFFECT: high quality and reliability of results of determination of gas content of coal beds by preventing loss of gas after re-drilling formation and lifting sample onto surface, as well as minimisation of loss of gas after lifting to surface.

1 cl, 2 dwg