入伍仪式
发表于 2025-3-28 17:14:05
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Flounder
发表于 2025-3-28 22:42:55
Deflection Tools and Techniques,m its intended course owing to a combination of formation effects and the behaviour of the bottom hole assembly. This is a well-known problem in drilling straight holes and can now be controlled by better knowledge of directional behaviour and the use of deflection tools.
圣歌
发表于 2025-3-29 02:01:10
Directional Well Planning,jectory of the borehole. Some of these may be difficult to estimate (for example, the amount of bit walk that may occur in certain formations). The experience gained from drilling previous directional wells in the same area is therefore very useful and should be incorporated at the planning stage of
扩张
发表于 2025-3-29 06:35:25
Positive Displacement Motors,hole motors have been proposed. Drill string rotation can be eliminated by having a motor placed downhole to drive the bit by hydraulic or electrical power. The turbodrill, first patented in 1873, provided a means of driving the bit by harnessing the power of the drilling fluid, but the complexity o