【摘要】 下部钻具组合的型式是影响井眼轨迹的重要因素之一。本文应用有限单元法,对下部钻具组合进行二维及三维静力分析,编制了相应的计算机程序。对下部钻县组合的工作特性进行了全面的分析。计算出了两种规格(12 1/4″井眼中的8″钻铤及8 1/2″井眼中的6 1/4″钻铤)、三种(一个、两个及三个扶正器)钻具组合的各种特性曲线,并从中优选出一些性能较好的钻具组合。文中还推荐出两种规格各九种型式性能较好的钻具组合,供定向钻井部门参考使用。更多还原

【Abstract】 The type of bottom-hole assemblies(BHA) is one of the most important factors which affect the bit’s tendency in directional drilling. In this paper, two and three dimensional static analysis of BHA was carried out by using the finite element method and the corresponding computer program has been compiled. The characteristics of BHA were analyzed. Various characteristic curves for two different collar sizes (8" collar within a 121/4" well or 61/4" collar within a 81/2" well) and three different kinds of BHA(BHA with single, double and three stabilizers) were obtained. From these curves, several BHA with excellent characteristics were selected. Nine different types of BHA for 61/4"-collar and 8"-collar were also recommended for directional drilling.更多还原