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预测下部钻具组合 ( BHA)的造斜能力对准确控制井眼轨迹十分重要。在现有 BHA造斜能力预测方法的基础上 ,探讨了一种更能为现场广泛应用的新型预测方法。通过确定一个区块不同地层中的稳斜钻具组合 ,可以求得该地层中特定条件下的平衡侧向力。以此为基础 ,可以确定给定 BHA的造斜能力。结果表明 ,这种方法既考虑了井眼轨迹、施工参数的影响 ,也能很好的考虑地层参数的影响。文中利用长庆油田某区块上的资料 ,给出了这种方法的计算实例。
It is important to predict the beveling capability of the BHA for accurate control of the wellbore trajectory. On the basis of the existing methods for predicting the incline ability of BHA, a new prediction method that is more widely used in the field is discussed. By determining the stability of a set of strata in different strata of a block, a balanced lateral force can be found under certain conditions in the formation. Based on this, the buildability of a given BHA can be determined. The results show that this method not only considers the influence of borehole trajectory and construction parameters, but also considers well the influence of formation parameters. In this paper, a block of Changqing Oilfield data on this calculation method is given.