Lead and backup tong-men should not stand between the two pipe tongs while the driller is making up or breaking out pipe or collars.
当司钻正在上卸钻杆和钻铤时，内外钳工不要站在两个大钳之间。
Theoretical analyses and practice show that it is not need to set expansion joints when the out pipe meets the radial compensation requirement and the support meets the requirement.
理论分析和实际应用表明，在引出管满足径向补偿要求和支架做法满足要求的条件下，可以不设立管伸缩节。
Theoretical analyses and practice show that it is not need to set expansion joints when the out pipe meets the radial compensation requirement and the support meets the requirement.
理论分析和实际应用表明，在引出管满足径向补偿要求和支架做法满足要求的条件下，可以不设立管伸缩节。
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