Analysis of coal seam gas extraction radius measurement technology
Chen Xuexi1,2, Hou Fengjun1, Zhang Pengxin1
1. Safety Engineering College, North China Institute of Science and Technology, Beijing 065201, China; 2. Key laboratory
of Coal Mine Disaster Prevention and Control of Hebei, Beijing 065201, China
Reasonable extraction radius is of great significance for pre-extraction by reasonable arrangement of extraction boreholes in mines, but at present there is no specific specification and general measurement method for determination of gas extraction radius. In this paper, the downhole direct measurement methods such as gas pressure drop method, gas content method, gas flow method and gas tracer method were compared and analyzed. The results showed that no single test method was suitable for all coal seam conditions. It was concluded that an efficient and accurate extraction radius determination method should be comprehensively combined with the occurrence of different coal seams.