To extend the service life of drill bits through reducing various drilling vibrations, this paper presents a fundamental analysis of the root cause of failure for polycrystalline diamond compact (PDC) bits during the drill-based process of vortex generation. In this work we develop a new type of PDC drill bit, namely the annular-grooved PDC bit, which can form one or more annular convex rock ridges at the bottom of the hole, having a raised ring that can limit transverse vibration. Our experimental results confirm that the accelerations of the annular-grooved PDC bit in axial, tangential, and radial directions are smaller than that of a conventional PDC bit. More specifically, acceleration declines by 33.5%, 21.6%, and 25.9% in tangential, axial, and radial direction, respectively. Our experimental investigation also shows that, as the weight on bit and the rotation speed increase, bit vibration intensifies, and the impact load on bit increases which can worsen bit stability. However, as the height and the width of the rock ridge increase, the drilling vibrations in three directions can decline. Therefore, the developed annular-grooved PDC bit can reduce bit vibration and improve bit’s drilling stability.

为了通过减少各种钻探振动来延长钻头的使用寿命，本文对在基于钻头的旋涡产生过程中多晶金刚石复合片（PDC）钻头失效的根本原因进行了基本分析。在这项工作中，我们开发了一种新型的PDC钻头，即环形凹槽的PDC钻头，它可以在孔的底部形成一个或多个环形凸岩脊，并具有可以限制横向振动的凸起环。我们的实验结果证实，环形凹槽PDC钻头在轴向，切向和径向方向上的加速度小于常规PDC钻头的加速度。更具体地说，加速度沿切线，轴向和径向方向分别下降了33.5％，21.6％和25.9％。我们的实验研究还表明，随着钻头重量和旋转速度的增加，钻头振动加剧，并且钻头上的冲击载荷增加，这会恶化钻头的稳定性。但是，随着岩脊的高度和宽度的增加，三个方向上的钻探振动会降低。因此，开发出的环形槽PDC钻头可以减少钻头振动，提高钻头的钻进稳定性。