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根据以往水文地质鑽探的经验,每一套套管只能保护30—40米孔壁,如果一个160米深的鑽孔,全部用套管保护孔壁,至少要用8“、10”、12“、14”四种口径的套管400米,折合重量约30余吨,一个孔就需要这么多的套管。而我国水文地质勘探任务一年比一年增多,质量要求也越来越高,同时由于工农业的发展,需要勘探深层地下水的工作愈来愈多,勘探孔愈
According to the previous experience of hydrogeological drilling, each casing can only protect 30-40 meters wall, if a 160 meters deep drilling, all with a casing to protect the hole wall, at least with 8 “, 10 12 ”, 14 " four caliber casing 400 meters, equivalent to about 30 tons of weight, a hole will need so much casing. However, the task of hydrogeological exploration in our country has been increasing year by year and the quality requirements are getting higher and higher. At the same time, due to the development of industry and agriculture, more and more work is needed to explore deep groundwater.