| 摘要: |
| 钻柱轴向力是并眼倾角、钻柱摩擦系数及钻柱浮重的函数,将此函数代人斜井钻柱挠曲线方程,并采用无穷级 数法求解,确定钻柱长度系数与临界屈曲压力系数之间的关系。结果表明:当钻柱长度系数增加时,临界屈曲压力 系数趋于常数;钻进过程中钻柱很容易发生屈曲,在进行钻柱摩阻扭矩分析时,考虑钻柱的屈曲很有必要。 |
| 关键词: 斜井 钻柱 屈曲 临界载荷 |
| DOI： |
| 分类号: |
| 基金项目:国家重大专项项目(2008ZX05022);胜利油田博士后基金项目(GKB0702) |
|
| Stability of drilling string considering gravity in inclined well |
|
TANG Bo1,WANG Min-sheng1,2
|
|
(1. Drilling Technology Research Institute, Shengli Petroleum Administrative Bureau, Dongying 257017, China;2.College of Petroleum Engineering in China University of Petroleum, Dongying 257061，China)
|
| Abstract: |
| The axis load is function of angle of inclination, frictional coefficient and weight of drill string in drilling fluid. The function was applied to the flexure equations of drilling string and solved by infinite series method. And the relationship between the coefficient of string length and coefficient of critical buckling pressure was determined. The results show that the coefficient of critical buckling pressure will be a constant if the coefficient of string length increases. The buckling will easily occur while drilling, so it is necessary to calculate the buckling during calculating the torque and drag of string. |
| Key words: inclined well drilling string buckling critical load |
