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在萨尔煤田,进行了直径200mm,长300m 的大直径钻孔抽放瓦斯的专门试验,用以考察能否在抽瓦斯效果上有所改善。如果使用的效果较好,则用以补足或代替常规钻孔抽瓦斯。
In the Saar coalfield, a special test was conducted on large-diameter borehole drainage gas with a diameter of 200 mm and a length of 300 m to check whether the gas drainage can be improved. If the effect is better, it is used to make up for or replace conventional drilling gas drainage.