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。