西气东输管道通过长江工程地质勘察水上钻探工艺合理性分析

On the Rationality of Drilling Process on Water in Engineering Geologic Investigation for the Pipeline Transport Gas from West to East through Yangtze River

长江水深流急 ,流态紊乱 ,给其水上钻探造成极大困难。在大型铁壳运输船上铺设枕木与木板构成侧跨钻探平台 ,抛锚泊位后多方位固定 ;利用厚壁套管隔离江水 ,并在一定水深所对应的套管部位逆水流斜拉钢丝绳 ;钻进不同的地层采用各异的钻具、泥浆和钻进方法等等。这些措施有机地结合在一起 ,能够克服各种复杂的影响因素 ,使钻探作业得以顺利进行。

The yangtze river is deep with turbulent flow which makes the drilling on water very difficult.With the combination of various equipments,tools and drilling techniques to overcome all the complicate influential factors the drilling is conducted smoothly.