新型切削齿及高密度保径布齿提高钻头在硬研磨性地层中的使用寿命。
New type PDC cutters and heavyset gage design promote longer bit life in hard and abrasive formations.
在垂直布齿保径段及冠部曲线不能用方程表示时，均能实现连续的布齿。
This means can realize continuous cutter distribution design at the vertical gauge-protection segment or when we don't know curve's equation.
通过改变喷嘴入口压力、钻头保径宽度、喷嘴直径等影响因素，来研究井底流场的变化。
By changing the nozzle inlet pressure, drill gage width, nozzle diameter factors, to study the changes in these flow fields.
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