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1·The failure analysis of the high speed roller bit bearing.

高速牙轮钻头轴承的失效分析。

2·In this paper, on the basis of the results obtained from the bench and field tests of the three roller bit, its improving direction is approached.

本文以三牙轮钻头的台架试验和油气田现场试验的效果为依据，探讨三牙轮钻头的改进方向。

3·A modern design method, by which computer aided optimum design is used through the whole process of roller bit design, is introduced in this article.

介绍一种牙轮钻头的现代设计方法。设计过程全部使用计算机辅助设计和优化设计。

4·Analysis of the side-wall pattern shows that the side-cutting process of the roller bit is related to not only the teeth surface design but also the rock property and the...

井壁模式分析说明，牙轮钻头的侧向切削过程不仅与齿面结构有关，而且与岩石性质、钻井参数有关。

5·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。

6·Analysis of the side-wall pattern shows that the side-cutting process of the roller bit is related to not only the teeth surface design but also the rock property and the drilling parameters.

井壁模式分析说明，牙轮钻头的侧向切削过程不仅与齿面结构有关，而且与岩石性质、钻井参数有关。

7·The rock-breaking mechanism of roller bit teeth is always a hot focus and difficulty in the fields of drilling, and it receives widely researchers attentions in the rock mechanics and the engineering.

牙轮钻头牙齿破岩机理研究一直是钻井工程的一个热点和难点，备受岩石力学与工程界的关注和重视。

8·On the system dynamics, the dynamics model for roller cone bit under the interaction of drilling string and rock was established.

从系统动力学的角度出发，建立了基于钻柱、岩石相互作用下的牙轮钻头动力学模型。

9·Using a foam roller is simple, but working some areas may take a bit of practice and some body contortion. You start by finding a relatively open area with some floor space.

使用泡沫轴很简单，但是要让它对身体一些部位的起到锻炼作用还需要一些练习和身体的柔韧性。

10·On the basis of many experiments, the mechanics model for the interaction of roller cone bit and rock was established.

在大量单元实验的基础上，建立了牙轮钻头与岩石相互作用力学模型。