Friction between the drill string and the well wall is one of the key factors restricting the rate of penetration (ROP) in the process of sliding drilling in a horizontal well. The problem is effectively solved by applying the vibrating drag-reduction technology. In this paper, the authors propose a new type of mechanical rotary percussion tool driven by the positive displacement motor (PDM) and simulate the drag reduction effect of the tool in a horizontal well. The results show that the drag reduction effect depends on how the weight on the bit (WOB) is transmitted to the bit. When the excitation frequency is high, it causes severe fluctuation of the WOB. To maximize the overall WOB, the excitation frequency needs to be optimized. The WOB fluctuation contains not only the excitation frequency but also the double-excitation frequency and triple-excitation frequency. The research results can provide theoretical guidance for the application of the rotary percussion tool in horizontal wells.
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Acknowledgments
The authors would like to acknowledge the academic and technical support of the China University of Petroleum (East China). This paper is supported by the Major Science and Technology Project of CNPC “Research on efficient exploration and development theory and key technologies of deep oil and gas in the Tarim Basin” (No. ZD2019-183-005).
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Translated from Khimiya i Tekhnologiya Topliv i Masel, No. 6, pp. 120–126, November-December, 2021.
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Guan, Z., Liang, D., Xu, Y. et al. Influence of Mechanical Rotary Percussion Tool on Friction Drag in Horizontal Wells. Chem Technol Fuels Oils 57, 1035–1043 (2022). https://doi.org/10.1007/s10553-022-01341-3
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DOI: https://doi.org/10.1007/s10553-022-01341-3