摘要
作者在假设无扶正器的钻柱为均质等截面弹性管、两端为铰支座的条件下,研究了钻井液流动对钻柱横向振动和稳定性的影响,导出了振动的频率方程和失稳的临界方程。钻井液在钻柱内流动将增加钻柱横向振动惯性质量、侧向惯性作用力和诱导钻柱振动。当钻柱的轴向力一定时,钻井液流速增大,钻柱横向振动频率降低。流速大于钻柱振动基频为零的流速时,钻柱将发生失稳现象。
Assuming that the drill stem is a homogeneous elastic pipe with constant section, articulated at both ends and without stabilizers, the author studies the effects of the flowage of drill fluid on the lateral vibration and stability of the drill stem, and derives the vibration frequency equation and the critical equation of destabilization. The flow of drill fluid in the drill stem will increase the inertia of the stem's lateral vibration and the lateral inertial force to the stem and thus induce the vibration of the stem. By constant axial force on the stem, the lateral vibration frequency of the stem decreases with the increase of the fluid flow rate. When the flow rate of the fluid is higher than that where by the fundamental frequency of the stem is zero, the stem will be lacking of stability
出处
《石油机械》
北大核心
1990年第1期31-36,7-8,共6页
China Petroleum Machinery
