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。

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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。

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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。

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