rigid wall
... rigid temperature control 温度严格控制器 rigid wall 刚性井壁 rigid water film 刚性水膜 ...
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由于其刚性比钻铤少，和井壁接触面积小，也不容易形成压差卡钻。
Because its rigidity are less than the drill collar, less contact area with wall of a well, is also not easy to form differential pressure sticking.
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