Simulation and experimental research on flow field andtemperature field of diamond impregnated drill bit
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摘要: 为提高金刚石钻头的钻进效率,采用数值模拟与试验的方法研究孕镶金刚石钻头孔底流场与温度场,以合理设计钻头结构,保证钻进过程中钻头具有良好的冷却和排屑能力,避免钻头底唇面温度上升过高造成其非正常磨损。结果表明:流场产生的横向压力对转向面水口壁的压力破坏作用较大;钻头与岩石接触面温度变化与水口数目有关,水口过多会导致单个水口的钻井液流量减少,降低水口处的热传导效率,冷却效果不足,从而造成钻头磨损。Abstract: In order to improve the drilling efficiency of diamond drill bits, the bit structure is reasonably designed to ensure that the bit has a good cooling and chip removal ability during the drilling process, so as to avoid abnormal wear caused by excessive rise of the temperature at the bottom lip of the bit. Numerical simulation and experimental research are used to study the distribution of flow field and temperature field at the bottom of the impregnated diamond drill bit. The results show that the lateral pressure generated by the flow field has a great effect on the pressure destruction of the nozzle wall. According to numerical simulation and drilling tests, the temperature of the contact surface between the drill and the rock is related to the number of nozzles but excessive nozzles will decrease the flow rate of drilling fluid in a single nozzle and thus decrease the heat transfer efficiency at the nozzle. Therefore, the cooling effect is reduced and the drill bit wears fast.
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Key words:
- numerical simulation /
- impregnated diamond bit /
- flow field /
- temperature field /
- bit design
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