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复杂地层的护孔一直是我局施工矿区钻探工作中存在的主要技术问题之一,从五十年代起使用一般粘土造浆,后来加以煤碱剂、香叶子粉进行处理,虽然
The protection of complicated formations has always been one of the major technical problems in the drilling work of our Bureau’s mining area. Since the 1950s, clay was used for general clay preparation and later treated with coal-based agents and fragrant leaf powder. Although