Bottomhole Model and Rock-Breaking Features Study of New Drill Bit with Swirling-Cutting Motion

Tian Jia-Lin; Wu Chun-Ming; Yang Lin; Liu Gang; Yang Zhi; Yuan Chang-Fu; Wu Bo

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Bottomhole Model and Rock-Breaking Features Study of New Drill Bit with Swirling-Cutting Motion

机译：新型旋切钻头的井底模型及破岩特性研究

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For improving the center rock-breaking efficiency, a new drill bit called "swirling-cutting bit", which has swirling-cutting motion and tornado-like bottomhole model during the rock-breaking process, is presented. Cylindrical coordinates are used for the analysis of swirling-cutting bit motion, in which the rotation and longitudinal motion of bit body are considered as transport motion while the rotation of the cone around its axis is taken as relative motion. According to the equations of its radius vector, polar angle and vertical height, the bottomhole models are analyzed, together with the influences of the wheel angle beta, the cone offset distance s and the wheel body ratio. On the basis of the shock and shear equations of swirling-cutting bit on different gear rings, the impact force, shear force and rock-breaking volume on cutters were obtained and compared with each other. The results show that the elements of the largest ring of the tornado-like bottomhole model cross the borehole center during the rock-breaking process, which can improve the rate of penetration and provide an effective solution to the low efficiency of center rock-breaking. Meanwhile, the analysis results of key parameters of bottomhole model are useful for structural optimization of swirling-cutting bit.

机译：为了提高中心破岩效率，提出了一种新的称为“旋切钻头”的钻头，该钻头在旋石过程中具有旋切运动和龙卷风状的井底模型。圆柱坐标用于分析旋切钻头的运动，其中钻头体的旋转和纵向运动被视为输送运动，而圆锥体绕其轴线的旋转被视为相对运动。根据其半径矢量，极角和垂直高度等式，分析了井底模型，以及轮角β，锥偏距s和轮体比的影响。根据不同齿圈上旋切钻头的冲击和剪切方程，得到了刀具上的冲击力，剪切力和碎石量，并进行了比较。结果表明，龙卷风状井底模型的最大环单元在破岩过程中穿越井眼中心，可以提高穿透速度，为解决中心破岩效率低提供有效的解决方案。同时，井底模型关键参数的分析结果对旋切钻头的结构优化具有一定的参考价值。

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《Journal of the Chinese Society of Mechanical Engineers, Series C: Transactions of the Chinese Society of Mechanical Engineers》 |2016年第3期|共9页
作者
Tian Jia-Lin; Wu Chun-Ming; Yang Lin; Liu Gang; Yang Zhi; Yuan Chang-Fu; Wu Bo;
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正文语种 eng
中图分类机械、仪表工业;
关键词
swirling-cutting motion; drill bit; tornado-like; bottomhole model; parameter design; calculation method;

机译：旋切运动;钻头;龙卷风;井眼模型;参数设计;计算方法;

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机译：新型旋切钻头的井底模型及破岩特性研究
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Bottomhole Model and Rock-Breaking Features Study of New Drill Bit with Swirling-Cutting Motion

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