【摘要】 试验采用8(1/2)in和12(1/4)in两种PDC钻头,对嘉陵江石灰岩和香溪砂岩两种典型岩样进行钻进,在不同钻头转速和钻压下,测得了扭矩和机械钻速。分析试验结果得出,对于表面刮削破碎和体积破碎两种岩石破碎状态,钻压对扭矩的影响不一样。当钻压没有达到体积破碎钻压时,钻压对扭矩的影响较小;当钻压超过体积破碎钻压时,钻压对扭矩的影响非常明显。钻头转速对钻头扭矩几乎无影响。更多还原

【Abstract】 8 1/2" and 12 1/2" PDC bits are used to drill typical rock samples of Jialingjiang limestone and Xiangxi sandstone in experiments. Torque and penetration rate are taken under different bit speeds and weight on bit. The result of experiment shows that the effect of weight on bit on the torque is different for two different conditions of surface scraping rock break and volume break. When weight on bit is not reached at volume break pressure, the effect of weight on bit on the torque is less; when it is over the volume break pressure, the effect is obvious. Bit speed is almost no influence on the torque.更多还原