• The kelly bushing has an inside profile matching the kelly's outside profile (either square or hexagonal), but with slightly larger dimensions so that the kelly can freely move up and down inside.

    钻杆心的剖面与方钻杆外部形状(四钻杆方钻杆)完全匹配稍微要大于方钻杆补心的尺寸以便方钻杆能够上下自由运动。

    youdao

  • The kelly bushing has an inside profile matching the kelly's outside profile (either square or hexagonal), but with slightly larger dimensions so that the kelly can freely move up and down inside.

    钻杆心的剖面与方钻杆外部形状(四钻杆方钻杆)完全匹配稍微要大于方钻杆补心的尺寸以便方钻杆能够上下自由运动。

    youdao

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