The on-site tests of 5 wells showed that the stiffness of lower drill pipe assembly was increased to controldeviation in the straight hole.
经现场5口井试验表明，不弯曲钻铤能够起到增大下部钻具组合刚度，控制直井段井斜的作用；
2
In this paper, the concept of preview course lateral deviation was given and a corresponding driver control model was set up.
文章给出了横向预瞄偏差的概念，提出了一种基于横向预瞄偏差的驾驶员前视轨迹控制模型。
3
This paper introduces successful construction method and control measure currently used for holedrill, borehole deviation, protection tube, and embedment and installation of bimetal mark.