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为了有效治理瓦斯,解决工作面顶板为坚硬厚砂岩,采高大于3.2 m,工作面推进速度大于5 m/d的条件下,钻井钻杆常被错断,造成地面钻井突然停气这一技术难题,进行了“让抗”Ⅵ型钻井的结构设计、理论计算和现场试验。经过丁集矿12采区的1262(1)工作面6号钻井连续252 d的现场观测,结果表明,“让抗”Ⅵ型钻井是特困地质开采条件下有效防止钻井被破坏的新技术。
In order to effectively control gas and solve the problem that the drilling face of the working face is hard and thick sandstone, the mining height is more than 3.2 m and the working face advancing speed is more than 5 m / d, the drilling drill pipe is often broken, Difficult to carry out the structural design, theoretical calculation and field test of “anti-resistance” Ⅵ drilling. The results of field observation on No.6 drilling face of 1262 (1) working face in No. 12 mining area of Dingji Mine for 252 consecutive days show that "anti - type Ⅵ drilling is a new technology that can effectively prevent drilling damage under the conditions of extremely difficult geological mining .