The collar has a TAB with a button hole.
那个衣领有一个小垂片，片上有一个钮扣孔。
The downhole stabilizer location adjuster, fixed between the bit and the drill collar, is a special tool for continual deviation control of a slant hole.
井下稳定器安放位置调节器是斜井旋转钻井时实施井斜连续控制的专用工具，安装在钻头与钻铤之间。
The downhole stabilizer location adjuster, fixed between the bit and the drill collar, is a special tool for continual deviation control of a slant hole.
井下稳定器安放位置调节器是斜井旋转钻井时实施井斜连续控制的专用工具，安装在钻头与钻铤之间。
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