巨厚砂砾层裸孔钻进施工技术

Construction Technologies Employed for Open Hole Drilling in Super-thick Gravel Layer

摘要:

在江苏沿海地区进行城市地质及水文地质等区域性地质调查，主要的野外工作手段就是全孔取心岩心钻探，但江苏沿海地区沉积层厚度300～500 m不等，最深处800 m之多。在如此之深的巨厚沉积层中钻探取心、且取心率要求之高在江苏乃至全国没有先例。结合某钻孔的施工实例，从钻探设备的选择、施工工艺的确定、泥浆控制技术等方面入手，全面总结了江苏沿海地区巨厚砂砾层全孔取心施工技术，对类似钻探项目的实施具有很好的借鉴作用。

Abstract:

In the regional geological survey of urban geology and hydrogeology in coastal area of Jiangsu Province, full coring drilling is the main field work means. The sedimentary layers thickness are of 300～500m inequality, the deepest place is up to more than 800m. There is no precedent of coring in such thick sedimentary layer with such requirement in Jiangsu Province even in China. According to a drilling construction case, this paper summarizes the full coring drilling construction technology in very thick gravel layer of Jiangsu coastal area starting with drilling equipments selection, construction technologies determination and mud control technology, which could be referred in similar drilling projects in the future.