摘要
采用粗径岩心管、水泥封闭等方法在新生界松散层中人为叉孔有时效果不太明显。而碗状钻头人为叉孔成功率高,施工工艺简单,节省了时间,降低了成本。本文结合实例简介了碗状钻头的适用范围。
The effect is not apparently when using methods of large-diameter barrels,cementation and so forth during branching drilling in Cenozoic loose beds.Whereas when using bowl shaped bit,the success ratio of branching is high, process simplified,time saved and cost reduced.The paper introduces the range of applicability of bowl shaped bits with examples.
出处
《中国煤田地质》
2004年第2期55-56,共2页
Coal Geology of China
关键词
碗状钻头
松散地层
叉孔
应用
bowl shaped bit
loose bed
branch hole
application
