It is one of the effective methods for energy and resources comprehensive utilization to have gas drained to the ground by using gas-discharging hole in China.

• 利用瓦斯抽排孔把井下瓦斯预抽后排到地面,是我国目前煤矿预防瓦斯事故和进行综合利用能源的有效方法之一。