牙轮钻头是钻井工程中最主要的破岩工具，其工作性能的好坏直接影响钻井质量、钻井效率和钻井成本。
The operating performance quality of the roller bit, which is the most main broken crag tool, directly influence the well drilling quality, well drilling efficiency and well drilling cost.
牙轮钻头是钻井工程中最主要的破岩工具，其工作性能的好坏直接影响钻井质量、钻井效率和钻井成本。
The operating performance quality of the roller bit, which is the most main broken crag tool, directly influence the well drilling quality, well drilling efficiency and well drilling cost.
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