The overall characteristics of flow field are analyzed and various influences of nozzle diameter on the downhole flow field of PDC bits are obtained.
分析了流场的总体特点，得出了喷嘴孔径对PDC钻头井底流场的各种影响。
Through drilling experiment in 156 adjustment Wells, the drilling behaviors, cutter wear, downhole jet flow field and drilling effect of drag bits and roller ones were comparatively analyzed.
通过156口调整井钻井试验，对比分析了刮刀钻头和牙轮钻头的钻进特性、牙齿磨损特性、井底流场特性及钻井效果。
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