钻柱内钻井液流动对钻柱横向振动的影响

Influence of the drill fluid flow on lateral vibration of drill stem

在假设无扶正器钻柱为均质等截面弹性管,两端为铰支的条件下,研究了钻柱内钻井液流动对钻柱横向振动的影响。钻柱内的钻井液增加了钻柱横向振动的惯性质量。在一般情况下,钻井液流动对钻柱的横向振动频率影响很小,既不会诱发钻柱振动,也不会使钻柱失稳。

Assuming that a drill stem without stabilizers is a homogeneous elastic pipe with uniform section, articulated at both ends, the authors make a study of the influence of the drill fluid flow in drill stem on the lateral vibration of the drill stem. The drill fluid in the drill stem increases the inertia of lateral vibration. Under conventional conditions, the drill fluid flow exerts only very small influence onthe frequency of lateral vibration, and is impossible to cause lateral vibration and lack of stability to the drill stem.