新型凹状曲面金刚石复合片切削具的参数计算和分析

Parameter calculation and analysis of a novel concave surface PDC cutter

摘要:

PDC钻头在石油天然气钻井和地质勘探钻进中得到了广泛的应用，但是，钻井中钻具的振动及其引起的PDC非正常磨损，影响了这种先进方法的技术经济效果。国内外钻探工作者提出使用楔形和圆柱形切削具，对于防止振动及其非正常磨损、提高钻探技术经济指标起了一定的作用，但未根本解决。俄罗斯专家提出使用凹状曲面PDC切削具，经过理论计算和分析对比，对其进行了计算机模拟，给出了有关参数（凹状曲面圆锥顶角，安装前角），对于解决PDC振动问题有一定参考价值，值得引起我们的注意。

Abstract:

PDC bits are widely used in oil and gas drilling， and geological exploration drilling. However， vibrations and abnormal wear of the bits resulting from them compromise the technical and economic effectiveness of the advanced drilling method. The wedge and conic form PDC cutters proposed by both Chinese and foreign specialists have been somehow effective in preventing the vibrations and abnormal wear of drill bits， and increasing the technical and economic indexes； but they can not eliminate the problem completely. Russian scientists have proposed a new type concave PDC cutter， performed computer simulation， and presented related parameters （concave cone angle and rake angle） through theoretical calculation and analytical comparison. The concave PDC cutter can provide some reference for solving the vibrations of PDC bits； thus， it is noteworthy for us to pay attention to.