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。
How to control the normal stress between sealing faces is a critical factor while using metal face seals for rolling cutter rock bits.
在牙轮钻头中成功应用单金属浮动金属密封结构的关键在于控制密封端面之间的接触压力。
Blade tools: eyebolt, turning tool, Allen key, screw tap, milling cutter, drill bits, etc.
刀刃工具类：埃令螺丝(吊环)、圆车刀、六角匙、丝攻、铣刀、钻咀等。
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