聚晶金刚石复合片钻头喷嘴倾角组合的流场特性

为了解决番禺地区珠江组快速钻进中出现的PDC钻头泥包问题，在实体PDC钻头计算模型基础上，运用数值模拟方法，采用标准 两方程模型对主喷嘴和辅助喷嘴不同喷射倾角组合进行井底流场特性研究，最优化喷嘴角度组合。结果表明：主刀翼1号喷嘴喷射倾角20°、3号喷嘴喷射倾角15°能使井底流场分布最优；远离主刀翼的4号和5号喷嘴喷射倾角变化对井底流场影响较大，适当增加这两个喷嘴喷射倾角有利于井底岩屑快速排出；2号喷嘴喷射倾角在限定范围内变化，对井底流场影响有限。最后，1-5号喷嘴喷射倾角分别按照20°、25°、15°、25°和25°组合布置，应用于个性化215.9mm五刀翼PDC钻头设计中，在实钻中取得了良好的进尺和机械钻速，成功解决钻头泥包。

Study on flow field characteristics of PDC bit nozzle inclination angle combination

In order to solve the balling problem of PDC bit in rapid drilling in Zhujiang formation in Pan Yu. Based on the PDC bit model, the nozzle angle combination is further optimized by numerical simulation method. The bottom hole flow field characteristics of the main nozzle and auxiliary nozzle are analyzed by using the standard two-equation model under different injection inclination combination. The results show that the model used in this study the inclination of No 1 and 3 nozzles is 20° and 15° respectively, which can optimize the distribution of downhole flow field. The change of injection inclination angle of No 1 4 and 5, which is far away from the main blade has a great influence on the bottom hole flow field. In addition, the No 1 nozzle inclination within limits, which has a limited impact on the bottom hole flow field. It is applied in the design of personalized 215.9mm five-blade PDC bit. The high footage and ROP are obtained, the problem of bit balling is solved in drilling.