Dynamic Response of Two-Degree-of-Freedom Riserless Drill String for Vortex-Induced Vibration Suppression and Enhancement  

作　　者：WANG Yu LOU Min WANG Yangyang ZHANG Chen 

机构地区：[1]School of Petroleum Engineering,China University of Petroleum(East China),Qingdao 266580,China [2]Key Laboratory of Unconventional Oil&Gas Development(China University of Petroleum(East China)),Ministry of Education,Qingdao 266580,China

出　　处：《Journal of Ocean University of China》2023年第3期612-626,共15页中国海洋大学学报（英文版）

基　　金：supported by the National Natural Science Foundation of China(No.U2006226);the National Key Research and Development Program of China(No.2016YFC0303800)。

摘　　要：The mechanical behavior,dynamic evolution,and flow-field distribution of a two-degree-of-freedom riserless drill string were simulated numerically by using FLUENT fluid simulation software with the user-defined function embedded.The rotation angular velocities before and after the critical rotation angular velocity were used as independent variables,and the reduced velocity range was 3-14.Fluid-structure coupling was realized based on the dynamic overset grid and the SST k-ωturbulence model.Results reveal that the dynamic response of the riserless drill string was considerably affected by rotation and flow velocity,which are coupled with each other.The cross-flow average dimensionless displacement increased with the rotation angular velocity,and rotation considerably enhanced the in-line maximum average dimensionless displacement.However,the cross-flow amplitude caused by vortex-induced vibration was suppressed when the rotation angular velocity reached a certain value.The in-line and cross-flow frequencies were the same,thereby causing the trajectory to deviate from the standard'figure-eight'shape and become a closed circle shape.The vortex did not fall behind the cylinder at low reduced velocity with high-rotation angular velocity,and the structure of the near-wake vortex remained U-shaped.The wake of the cylinder was deflected along the cross-flow direction,thereby leading to vibration asymmetry and resulting in increased vibration instability and disordered vibration trajectories,especially at high-rotation angular velocities.

关 键 词：riserless drill string TWO-DEGREE-OF-FREEDOM vortex-induced vibration ROTATION dynamic response 

分 类 号：P756.2[天文地球—海洋科学]