我队施工地区地层,上部为壶天灰岩,中部为梓门桥灰岩,中、下部为测水煤组,底部是石凳子灰岩。上、中部溶洞、裂隙发育,所有钻孔都漏失。施工中采用泡沫泥浆,虽然无法堵住溶洞、裂隙等严重漏失通道,但是由于泥浆比重小,可以有效地防止中小型漏失,保证正常钻进。 In the construction area of ​​our team, the upper part is Hu Tian limestone, the middle part is Zimenqiao limestone, the middle and lower part are water-logging coal sets, and the bottom is stone stool limestone. Upper and middle caves, fissures development, all drilling are lost. The construction of foam slurry, although unable to block the caverns, fissures and other serious loss of access, but due to the small proportion of mud, can effectively prevent small and medium-sized loss, to ensure normal drilling.