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根据水文地质人员提供的抽水试验工程设计，我队于1985年底在福建省平潭县竹屿标准砂矿区施工了大口径钻孔进行抽水试验，由于钻孔结构设计不合理，发生了套管事故，处理时间长达40天（不开夜班），造成了不应有的损失。原设计抽水试验钻孔结构如附图，左图为抽下层水的钻孔结构，右图为抽上层水的钻孔结构。采用冲击钻进法成井，以200kg吊锤冲击φ273mm套管，用带有阀门钻头的取样简捞取砂心，打穿上层砂进入海泥层（隔水层）后留下φ273mm套管11.4m护壁，以下改φ219mm钻进至孔深24m终孔，留下φ219mm套管
According to the pumping test engineering provided by hydrogeologists, our team conducted large-diameter borehole pumping tests at the standard bamboo mining area of Pingtan County, Pingtan County, Fujian Province at the end of 1985. Due to the unreasonable design of the borehole structure, a casing accident , Processing time up to 40 days (not open night shift), resulting in unnecessary losses. The original design of pumping test drilling structure shown in the drawings, the left picture shows the pumping structure of sub-subterranean water, the right picture shows the drilling structure pumping pumping water. Using the percussion drilling method into the well, with 200kg hanging hammer impact φ273mm casing, with a sampling bit with a valve drill to take the sand heart, punch through the sand into the sea mud layer (aquitard) leaving φ273mm casing 11.4m retaining wall , The following change φ219mm drilling hole depth 24m final hole, leaving φ219mm casing