Mechanical characterization of bottom hole assembly in air drilling engineering

Q4 Engineering

Mathematical Models in Engineering Pub Date : 2023-03-20 DOI:10.21595/mme.2023.23107

Yutian Han, Bin Tang, Taike Zhang, Jinlong Liu, Yanming Wang, Li Yang, Kang Yang

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Abstract

To study the mechanism and control of well deviation in air drilling, a mechanical model of bottom hole assembly (BHA) with double stabilizer is established by using the beam-column method. The mathematical model related to side force of BHA and deviating force of strata are derived by analyzing the characteristics of gravel strata in the practical engineering. The effects of weight on bit (WOB), expansion ratio of borehole diameter (ERBD), angle of well inclination, diameter of drill collar and strata bending moment on side force of BHA are explored. Then, the superposition of bit side force and deviating force of strata is obtained. The results display that side force of BHA is obviously influenced by ERBD, angle of well inclination, diameter of drill collar and strata bending moment; and the deviation force and azimuth force of gravel strata are significantly affected by comprehensive cutting anisotropy index, angle of well inclination and dip angle of strata. Finally, the variation tendency of inclination angle and azimuth angle in field measurement is consistent with the theoretical and numerical researches. The present work can provide theoretical guidance to control the well deviation in the practical air drilling.

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空气钻井工程中井底钻具组合的力学特性

为了研究空气钻井中井偏的机理和控制，采用梁柱法建立了双稳定器底部钻具组合的力学模型。在实际工程中，通过分析砾石地层的特点，推导了底部钻具组合侧向力和地层偏压力的数学模型。探讨了钻头重量、井径膨胀比、井斜角、钻铤直径和地层弯矩对钻具组合侧向力的影响。然后，得到了钻头侧向力与地层偏斜力的叠加。结果表明，ERBD、井斜角、钻铤直径和地层弯矩对钻具组合侧向力有明显影响；砾石地层的偏斜力和方位力受综合切削各向异性指数、井斜角度和地层倾角的影响较大。最后，野外测量中倾角和方位角的变化趋势与理论和数值研究相一致。本工作可为实际空气钻井中控制井眼偏差提供理论指导。

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