摘要
钻柱在导向孔内的非线性屈曲关系着定向穿越整个工程的成败。基于三维曲井钻柱非线性屈曲平衡方程,考虑孔壁径向约束与摩擦,建立了定向穿越钻柱-孔壁系统仿真分析模型。在将该模型的仿真结果与Tulsa大学相关实验结论进行对比验证的基础上,以渭河定向穿越工程导向孔钻进为例,对整个钻柱系统的非线性屈曲行为进行了仿真分析。结果表明,无论正弦屈曲或螺旋屈曲,扭矩负载对其影响很小;两者的产生过程差异较大,如当钻柱应力水平保持在疲劳强度以下时,则仅会出现正弦屈曲;相对于水平段和斜直段,弯曲段钻柱的非线性屈曲更严重。该结论为定向穿越导向孔钻进施工参数的优选提供指导。
It is closely related to researching the nonlinear buckling behaviors of drill-string during the pilot hole drilling whether the horizontal directional drilling can be succeed. Based on the equilibrium equation of drill-string dynamics in 3-D curve well, and considering the radial constraints of borehole and the friction, the finite element model of drillstring-borehole system in horizontal directional drilling was built. Based on the comparison between the results from the new model and the tests from the Tulsa University, taking the pilot hole stage of Weihe horizontal directional drilling as an example, the nonlinear buckling behavior of the whole drillstring system was researched. The results show that the effect of torque on drillstring buckling is very small no matter sinusoidal buckling or helical buckling, and there is a great difference between the generations of sinusoidal buckling and helical buckling, when drillstring stress keeps a low level under fatigue strength, the drill string only displays as the sinusoidal buckling. In addition, comparison to the horizontal and deviated borehole sections, the buckling state at the curve section of the whole borehole is more serious. The conclusions provide guidance for the construction parameters optimization in guide hole drilling.
出处
《系统仿真学报》
CAS
CSCD
北大核心
2013年第4期821-825,共5页
Journal of System Simulation
基金
国家自然科学基金项目(51222406)
四川省科技创新团队项目(12TD007)
关键词
定向穿越
屈曲
三维曲井
钻柱
临界轴向力
horizontal directional drilling
buckling
3-D curve well
drill-string
critical axial force
