Abstract
For the nonlinear vibration of the drill string in the drilling process, vibration characteristics analysis and experimental study of the drill string are conducted, which are to analyze the drill string dynamic characteristics with wellbore random friction force on the basis of the horizontal well. Firstly, considering the wellbore random friction force, the analysis models of the drill string vibration and the drilling efficiency of the horizontal well are established. Then, the establishment method of the random wellbore friction field is also obtained. With the combination of solution expressions of each force in the vibration equation, the discrete method of the dynamic model is established. According to the experimental test, the key input parameters are determined, and then, the example analysis of the vibration model is conducted. With the comparison of the experimental test and theoretical calculation, the influences of key parameters on the dynamic characteristics of the drill string are analyzed to verify the accuracy of the analysis model. The results can provide a new insight to the researches of the drill string dynamics, especially for the complex well, such as ultra-deep well, branch well and directional well, in which the wellbore friction has a significant influence on the result of the drill string kinetics. Moreover, the results can offer an important guidance for the design and application of new downhole tools.
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Funding was provided by Major National Science and Technology Project (Grant No. 2016ZX05038), The State Foundation for Studying Abroad (Grant No. 201608515039) and National Natural Science Foundation of China (Grant No. 51674216).
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Tian, J., Yang, Y. & Yang, L. Vibration characteristics analysis and experimental study of horizontal drill string with wellbore random friction force. Arch Appl Mech 87, 1439–1451 (2017). https://doi.org/10.1007/s00419-017-1262-9
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DOI: https://doi.org/10.1007/s00419-017-1262-9