论文部分内容阅读
在钻柱动力学模型的基础上,运用有限元法仿真模拟钻柱的动力学特性,计算钻柱动态应力,提出了钻柱动态安全判断准则,并计算了单扶正器钻柱和多扶正器钻柱的动态安全系数。结果表明:钻柱涡动特性直接关系到钻柱的动态安全,危险截面主要分布在中和点以下的下部钻具组合部分。合理地调整转盘转速和安放扶正器,可以降低钻柱的动态应力,提高钻柱的动态安全系数。钻柱动态安全系数能够反映钻柱井下运动情况,是衡量钻柱动态安全的重要指标。
On the basis of the dynamic model of the drill string, the dynamic characteristics of the drill string are simulated by the finite element method, the dynamic stress of the drill string is calculated, the dynamic safety judgment criterion of the drill string is proposed, and the single centralizer drill string and multi-center stabilizer Drill column dynamic safety factor. The results show that the eddy characteristics of the drill string are directly related to the dynamic safety of the drill string, and the dangerous cross sections are mainly distributed in the lower part of the drill assembly below the neutralization point. Reasonable adjustment of turntable speed and placement of centralizer can reduce the dynamic stress of drill string and improve the dynamic safety factor of drill string. The dynamic safety factor of the drill string can reflect the downhole movement of the drill string and is an important index to measure the dynamic safety of the drill string.