Study of Critical Speed for a Flexible Drill String System Based on Fluid-Structure Interaction
The TDS changed the drive mode and established a simple, flexiblemulti-body drill string system. The system consists of a derrick, a hoisting system, TDS, and a drill string system, and is inserted into a long, narrow borehole. The drill string then interacts with mud, the borehole wall, and the bottom hole, which generates resonance and increases the risk of drilling accidents. Natural frequency, which is related to the structure of the drill string, determines critical speed. In a vertical well, the transverse, torsional, and longitudinal fluidstructure interaction vibrations of the flexible_multi-body drill string system within 1,700 m was analysed using the ANSYS. The natural frequency and the associated critical speed for different bottomhole assemblies (BHAs) were obtained. Results show that reasonably selecting the TDS rotation speed and optimizing BHA offer practical engineering applications for increasing drilling speed, reducing drilling accidents, and improving economic returns.
Flexible drill string Interaction Resonance Frequency Critical speed TDS
Gui Jie Yu Lei Fu You Cai Yin
China University of Petroleum (East China), Qingdao 266555, China
国际会议
上海
英文
545-552
2011-10-21（万方平台首次上网日期，不代表论文的发表时间）