Abstract: Against problems existing in gas content measurement process are analyzed, and developed a reverse circulation fixed-point fast sampling device, the device includes sampling drill, double casing pipe and double channel soda bibcock, coal sample collection device, etc. Device adopts end are connected to the sampling drill rod end at the other end connected to the double casing pipe, through the coal produced by the rotation of drill rig drive double-wall drill pipe sampling, use of compressed air at the end of drilling formation pressure wind vortex, will blow out coal sample into the double-wall drill pipe inner tube into the sampling device. Meanwhile CHP50M coal seam gas content detector was used to collect the coal sample were measured, through the study of the optimization of coal bed gas content measurement of the field application results show that the sampling time is less than 3 min, sampling depth is more than 100 m, immediately after the success of the sample after 3~5 min to get coal bed gas content as a result.

Key words: Gas content, Rapid determination, Method optimization, Supporting devices, Field application