directional well drilling

• 定向井钻井

directional well drilling的用法和样例：

例句

1. Turbodrills is very important downhole drilling tools in petroleum drilling engineering,especially in deep well and deflected well.
   涡轮钻具是石油钻井工程中的一种重要井下动力钻具，在深井和定向井钻井中有着广泛的应用。