摘要
岩心钻探中,在砾石(漂砾)等破碎地层采用常规三翼扩孔钻头扩孔时,常出现憋车和卡钻现象,且扩孔效率低。为此,设计了具有导向和保径功能的扩孔钻头。新设计的扩孔钻头在宁夏灵武一个综合地质孔进行了应用,扩孔效果良好,平均扩孔效率3.5 m/h,形成的新孔眼与原孔眼同轴度高,孔径规则,下套管顺利,对第四系破碎地层进行了有效分隔,保障了后续取心钻进和物探测井的顺利进行。
During core drilling,blockage and sticking often occurs when conventional three-wing reaming bits are used for reaming in broken strata such as gravel(boulder),which results in low reaming efficiency.For this purpose,a reaming bit with guiding and gauge protection functions was designed,and was applied in a comprehensive geological hole in Lingwu,Ningxia,with good reaming effect,and the average reaming footage up to 3.5m/h.The reamed hole was highly coaxial with the original hole,and had a regular gauge,leading to smooth casing running.The Quaternary broken formation was effectively separated to ensure smooth performance of subsequent core drilling and geophysical logging.
作者
何玉云
王发民
HE Yuyun;WANG Famin(Ningxia Nuclear Industry Geological Exploration Institute,Yinchuan Ningxia 750021,China)
出处
《探矿工程（岩土钻掘工程）》
2019年第11期50-53,共4页
Exploration Engineering:Rock & Soil Drilling and Tunneling
基金
宁夏回族自治区第八批地勘基金项目“灵武幅、磁窑堡幅1∶5万综合地质调查项目”(编号:2017NCZ001803W)
关键词
岩心钻探
破碎砾石层
钻头保径
导向扩孔
扩孔钻头
core drilling
broken gravel bed
gauge-protected bit
guiding reaming
reaming bit
