The answer: wells that drill vertically down to the shale bed, then make a gradual 90-degree horizontal turn through the shale deposit.
目前，科学家提出了解决方案——先垂直钻探至页岩床位置，然后以90度水平地钻探页岩沉积层。
2
This paper discusses the prediction of the drill stem torque and bit forward direction in an offshore horizontal well by nonlinear FEM.
探讨了非线性有限元在预测水平井钻进中的钻柱扭矩及钻头前进方向的应用。
3
The drilling frame is the main load-carrying part in horizontal directional drill, its strength and stiffness have great effect on the performance of the drill.