切向导入式旋流喷嘴辅助PDC钻头破岩实验

Rock-breaking experiment by tangential import swirl nozzle assisted PDC bit

 袁军 邹德永 刘笑傲

 （中国石油大学（华东）石油工程学院，山东 青岛 266580）

 (College of Petroleum Engineering, China University of Petroleum, Qingdao 266580, China)

 为了提高PDC钻头在研磨性地层中的机械钻速，延长使用寿命，采用室内实验和现场验证的研究方法，设计了一种切向导入式旋流喷嘴。文中对旋流喷嘴的关键结构参数进行了优化，与普通圆喷嘴进行了破岩效果对比，并将旋流喷嘴应用到PDC钻头上，进行了现场验证试验。相同条件下，非对称切向导入口喷嘴的破岩效果比对称切向导入口喷嘴的破岩效果好，当切向导入口数量为3个、角度为30°和圆锥收缩角度为20°时，旋流喷嘴的破岩效果最好。切向导入式旋流喷嘴产生的破碎坑冲蚀体积是普通圆射流的4.00～5.60倍。现场应用结果表明，旋流PDC钻头的机械钻速比普通PDC钻头提高了51%～67%，并且延长了钻头使用寿命。

 To improve the drill speed and prolong the service life of PDC bit in abrasive formation, through laboratory experiment and oilfield verification, a type of tangential import swirl nozzle is designed. The key structure parameters of swirl nozzle are optimized, and then the swirl nozzle is applied to PDC bit to verify the rock-breaking effect. The researches show that the rock-breaking effect of non-symmetrical tangential import entrances is better than that of symmetrical tangential import entrances. The optimal tangential import entrance number is 3, the optimal angle of tangential import entrance 30 degree, and the optimal angle of cone contraction 20 degree. The erosion volume of crushing pit produced by swirl nozzle is about 4.00￣5.60 times that of common round nozzle. Field application results show that the drill speed of swirl PDC bit is increased by 51%￣67% compared with common PDC bit, and the service life is extended.

10.6056/dkyqt201604026