Effect of annulus drilling fluid on lateral vibration of drillstring

Journal of Vibroengineering

Lixin Li¹  Rui-He Wang²  Chunxu Yang²  Qilong Xue³  Laiju Han⁴ 

[1] Chinese Academy of Geological Sciences, Beijing, P. R. China;Petroleum Engineering College of China University of Petroleum, Qingdao, P. R. China;School of Engineering and Technology, China University of Geosciences, Beijing, P. R. China;Shengli Petroleum Engineering Co. Ltd, Drilling Technology Research Institute, Dongying, P. R. China;

关键词: annular drilling fluid;    lateral vibration;    drillstring;    added mass coefficient;    cfd;   

DOI  :  10.21595/jve.2019.20473

来源: DOAJ

【 摘 要 】

Annular drilling fluid between the drillstring and borehole wall has a great influence on lateral vibration of drillstring and the influence involves the added mass. Assuming the drilling fluid is incompressible, we derive the added mass coefficient that annular drilling fluid influences on lateral vibration of drillstring in the case of axial flow of drilling fluid. When the axial flow of drilling fluid is considered, the added mass coefficient is difficult to solve. We apply CFD method and dynamic mesh technique to establish the calculation model for the flow in the annulus caused by the vibration of drillstring in the annulus. The pressure distribution and velocity distribution of annular drilling fluid are obtained. The added mass force of the drilling fluid acting on the drillstring along the direction of the drillstring is obtained from the pressure distribution, and the added mass coefficient of the lateral vibration of the drillstring is obtained. This paper provides the basis to solve the added mass coefficient of the lateral vibration of drillstring considering axial flow of drilling fluid.

【 授权许可】

Unknown