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(一)事故简介峰峰某勘探区3721岩芯孔竣孔封闭时,用冲孔器冲洗井壁后,正欲灌注砂浆,孔内突然大量湧水,水头喷出井口一米多高。不仅砂浆无法灌注,就是直径35毫米的钢球放在孔内钻杆顶部亦被冲起,在井口接146毫米套管,水位上升至14米方才稳定。这种湧水究竟来自那些地层?根据钻孔记录和湧水有强烈臭味等特征分析,判断为孔底大青灰岩湧出的(在钻进过程中无湧水现象,故考
(A) an accident briefing Fengfeng a prospecting area 3721 core hole when the hole is closed, flushing the borehole with a punching device, is about to pour mortar, hole a sudden a large influx of water head out of the wellhead a meter high. Not only mortar can not be perfusion, is the diameter of 35 mm steel balls on the top of the hole in the drill pipe has also been washed in the wellhead connected to 146 mm casing, the water level rose to 14 meters was stable. According to the records of boreholes and the strong odor of gushing water, it is judged that there is no gushing of large green limestone at the bottom of the hole