Research and analysis of rock breaking mechanical model of single-roller PDC compound bit

Chunyan Kong, Mingkun Yang, Yangyang Jin, Yang Li, Zhang Junfu
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Abstract

In order to improve wear resistance and rock breaking efficiency of single-roller bit, a new type of bit, single-roller PDC compound bit is designed. The mechanical model of interaction between PDC teeth and rock of single-roller PDC compound bit is established, and the theoretical calculation formula of resultant force and torque generated by interaction between PDC teeth and rock on cone and bit is obtained. The rock-breaking experiment on the single-roller PDC compound bit are carried out. The results show that with the increase of front inclination angle, the axial force and radial force of PDC teeth decrease greatly at first and then tend to be stable, while the tangential force of PDC teeth decreases at first and then increases slightly; the axial force, radial force and tangential force all increase with the increase of the cutting depth; the maximum values of the three forces all appear at the position of the combined effect of the maximum cutting depth and the minimum front inclination angle. The maximum value of moment [Formula: see text] and [Formula: see text] both appear at the minimum value of h C and δ, while the maximum value of moment [Formula: see text] appears at the minimum value of δ. In order to reduce the acting moment generated by PDC cutter on the roller, the PDC cutter at different position heights can be designed with different front inclination angles. The rock breaking experiment results show that compared with the common single-roller bit, the single-roller PDC compound bit has higher rock breaking efficiency and better development prospect. When drilling in hard limestone, the single-roller PDC compound bit is more energy-efficient under higher WOB.
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单辊 PDC 复合钻头破岩力学模型研究与分析
为了提高单滚轮钻头的耐磨性和破岩效率,设计了一种新型钻头--单滚轮 PDC 复合钻头。建立了单滚柱 PDC 复合钻头 PDC 齿与岩石相互作用的力学模型,得到了 PDC 齿与岩石相互作用在锥体和钻头上产生的结果力和扭矩的理论计算公式。对单辊 PDC 复合钻头进行了破岩实验。结果表明,随着前倾角的增大,PDC 齿的轴向力和径向力先大幅减小后趋于稳定,而 PDC 齿的切向力则先减小后略有增大;轴向力、径向力和切向力均随着切削深度的增大而增大;三力的最大值均出现在最大切削深度和最小前倾角共同作用的位置。为了减小 PDC 刀盘对滚筒产生的作用力矩,可以在不同位置高度的 PDC 刀盘上设计不同的前倾角。破岩实验结果表明,与普通单滚轮钻头相比,单滚轮 PDC 复合钻头具有更高的破岩效率和更好的发展前景。在坚硬的石灰岩中钻进时,单滚轮 PDC 复合钻头在更高的 WOB 下更节能。
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来源期刊
CiteScore
3.80
自引率
10.00%
发文量
625
审稿时长
4.3 months
期刊介绍: The Journal of Mechanical Engineering Science advances the understanding of both the fundamentals of engineering science and its application to the solution of challenges and problems in engineering.
期刊最新文献
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