摘要
针对钻井过程中钻柱工作载荷或钻压超过某一临界值导致钻柱失稳现象,建立了钻柱非线性稳定性问题的分析模型,用数值分析的方法对整个钻柱系统的非线性屈曲过程进行了有限元仿真分析,解释了钻柱的失稳机理以及钻柱自重、钻压、转速、扭矩和井斜角等因素对钻柱屈曲的影响规律,研究了钻柱在井筒中发生屈曲时的位移、受力状况和各种工况下的失稳临界载荷。结果表明,在相同条件下钻柱螺旋屈曲临界载荷随井斜角增大而增大,呈非线性变化;临界载荷随扭矩的增大而减小,井斜角较大时临界载荷减小的幅度较小。对钻柱在井筒中的非线性屈曲行为研究和钻具组合设计的优化具有一定的参考价值。
Aiming at the instability phenomena of drill string in the process of drilling operation,the nonlinear drill string helical bucking model is set up.Also,the finite element analysis is presented with numerical method.The theory and the rule of drill string bucking influenced by dead load,rotating speed,weight on the bit and the well deviation are explained.It is shown that under the same conditions,the helical buckling load increases nonlinearly with the increase of the well deviation and decreases nonlinearly with the increase of torsion and the reduction decreases with the increase of deviation angle.From the analysis,the displacement and stress are objectively reflected when drill string buckling occurs in the well.The critical buckling load of drill string under various conditions is forecasted.For the study on nonlinear buckling of drill string,the optimization of BHA design and the reduction of drilling cost,there are both the theoretical and project practical significance.
出处
《西南石油大学学报（自然科学版）》
CAS
CSCD
北大核心
2010年第2期159-163,共5页
Journal of Southwest Petroleum University(Science & Technology Edition)
基金
国家自然科学基金(90410004)
新世纪优秀人才支持计划项目(NCET-05-0766)
关键词
钻柱
稳定性
螺旋屈曲
临界载荷
有限元
drill string
stability
helical buckling
critical load
finite element
作者简介
作者简介：朱才朝（1967-），男（汉族），湖北麻城人，教授，博士生导师，主要从事系统动力学及振动噪声预估与控制的研究。
