Through this experimentation, it indicates that the sampling bit added pumping hole ADAPTS to drilling in most fragmentized strata.
试验表明，增加了抽吸孔后的取样钻头适合在极其破碎的地层中钻进。
2
This paper analyzes the drillability, hole-making and carry of coarse grain concerning the Nubia sandstone, and concludes that it is suitable to be the crossing strata.
在可钻性、成孔性及粗颗粒可携带性等方面对努比亚砂岩进行了分析，认为将其作为穿越地层是可行的。
3
The characters of cross-well electromagnetic field in different conditions of hole and strata were compared and analyzed.