top hole 顶部井眼 ; 出钢口 ; [冶] 顶孔
top hole pressure 出口压力
top hole drilling 上部井段钻进
fusee top hole 发条轮上孔
Top Hole in one 一杆进洞
first-rate gilt-edged top-hole tops 最上等的
hole top 井口
top locklift hole 上锁销孔
Industrial Application of Dual-Gradient Drilling System for South China SeaThe paper suggests dual gradient top hole drilling (DGTHD) technology for the South China Sea based on casing drilling, which can shorten well construction time, and controlled shallow hazards.
该系统具有套管钻井和双梯度上部井眼钻井的优点,可以减少作业时间,有效控制深水浅层灾害。
参考来源 - 新型深水双梯度钻井系统原理、方法及应用研究·2,447,543篇论文数据，部分数据来源于NoteExpress
INTERJ/ADJ excellent; splendid 卓越的; 极好的
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