Journal of Southwest Petroleum University(Science & Technology Edition) ›› 2022, Vol. 44 ›› Issue (2): 148-158.DOI: 10.11885/j.issn.1674-5086.2020.01.05.01

• PETROLEUM MACHINERY AND OILFIELD CHEMISTRY • Previous Articles     Next Articles

Bi-nonlinear Fluid-induced Vibration Model of Tubing String in High-yield Gas Well

LI Zhong1, WANG Guorong2, FANG Dake1, WEI Anchao1, LIU Jun2   

  1. 1. Zhanjiang Branch, CNOOC China Ltd., Zhanjiang, Guangdong 524057, China;
    2. School of Mechatronic Engineering, Southwest Petroleum University, Chengdu, Sichuan 610500, China
  • Received:2020-01-05 Published:2022-04-22

Abstract: In view of the damage caused by fluid induced tubing string vibration in high-yield gas wells, the micro element method, energy method and Hamilton variational principle are used to establish the longitudinal and transversal coupling nonlinear fluid-induced vibration (FIV) model of tubing string. Based on the contact collision theory of elastic-plastic body, the nonlinear contact-collision model of tubing string is established and introduced into the fluid induced vibration model to obtain the bi-nonlinear model of tubing string in high-yield gas wells. The bi-nonlinear FIV model of tubing string is solved with the finite element method and Newmark—$\beta$ method. Compared with the experimental data in literatures and the calculation results of single nonlinear model only considering contact impact, the correctness and superiority of the FIV model of tubing string are verified. According to the parameters of a high-yield gas well in the field, a simulation test of fluid induced vibration of the gas well tubing string is carried out by using the similar principle. The vibration response data of the tubing string is measured and compared with the calculation results of the theoretical model, which again verifies the correctness of the bi-nonlinear FIV model of the tubing string. The nonlinear FIV model established in this paper can provide an effective analysis tool for the safety design of tubing string in high-yield gas well.

Key words: Hamilton variational principle, fluid-induced vibration, bi-nonlinear, contact-collision model, simulation test

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