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Shock and Vibration
Volume 2017, Article ID 4894032, 10 pages
Research Article

Study on Dynamic Response of Downhole Tools under Perforation Impact Load

1School of Mechatronic Engineering, Southwest Petroleum University, Chengdu, Sichuan 610500, China
2Xihua University, Chengdu, Sichuan 610039, China
3CNOOC Research Institute, Beijing 100028, China

Correspondence should be addressed to Liu Qingyou; moc.nuyila@66yquil

Received 22 March 2017; Revised 22 June 2017; Accepted 12 July 2017; Published 24 August 2017

Academic Editor: Miguel Neves

Copyright © 2017 Liu Jun et al. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.


A model of a multibody system is established to investigate the dynamic response of an oil tube-shock absorber-perforating gun system in downhole perforation-test joint operation. In the model, the oil tube and perforating gun are modeled as elastic rods and the shock absorber is modeled as single particle system with damping and a spring. Two force continuity conditions are used to simulate the interactions among the three components. The perforation impact load is determined by an experiment of underwater explosion of perforating bullets. Using the model, the effects of charge quantity of perforating bullet, the number of shock absorbers, and the length of oil tube on the dynamic response of oil tube and packer are investigated. On this basis, a basic principle of the combination design of shock absorber and oil tube is proposed to improve the mechanical state of downhole tools. The study results can provide theoretical support for the design of downhole perforation-test joint operation.