Experimental Study of Downhole Shock Absorber Based on the Similarity Theory

ZHANG Hongning, GUANG Zhichuan, WANG Heng, XU Yuqiang


Based on similarity theory, the similarity criterion of simulation test was derived and the experimental apparatus was established in accordance with the similarity criterion. The similarity criterion deduced by the dimensional theory has a much wider applicability than which deduced by differential physical equations. The experiment device of bottom hole assembly included absorber was designed in proportion of 1 to 10 according to the actual bottom hole assembly. Through the experiment device, the vibration of the drill string with absorber could be obviously observed. Moreover, analysis of the absorber performance experiments under the conditions of different WOB, speed, installation location and elastic stiffness could be carried out.
Key words: Drill string vibration; Similarity criterion; Simulation; Experiment


Drill string vibration; Similarity criterion; Simulation; Experiment

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DOI: http://dx.doi.org/10.3968/6626


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