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为防止井眼偏斜，降低直井的纠斜率，提高钻井速度和井身质量． 设计了一种新型偏心防斜钻具组合， 建立了钻具模型，利用有限元法对模型进行了求解，并与标准钻具进行了对比． 利用偏心钻具在旋转过程中的离心力和偏心短钻铤的偏重带的支撑作用，减小了钻头轴线倾角，从而减少了井斜． 通过三种钻具的对比分析，说明偏心钻具具有较好的防斜效果． 现场应用表明：采用偏心钻具，纠斜率由８ ．９ ％ 降至２ ．８ ％ ，平均机械钻速由２６ ．３０ ｍｈ 提高到３４ ．９６ ｍｈ ．
In order to prevent borehole deviation, reduce the correction rate of vertical wells, improve drilling speed and well quality. A new type of eccentric anti-skew drilling tool combination was designed. A drilling tool model was established. The finite element method was used to solve the model and compared with the standard drilling tool. Utilizing the centrifugal force of the eccentric drill during the rotation and the supporting function of the eccentric belt of the eccentric short drill collar, the inclination of the bit axis is reduced, thereby reducing the inclination of the well. Through the comparative analysis of the three kinds of drilling tools, it shows that eccentric drilling tools have better anti-skew effect. Field applications show that: the use of eccentric drilling, correction rate of 8 from the slope. 9% to 2. 8%, the average penetration rate from 26. 30 mh increased to 34. 96 mh.