The basic difference of outside-vent coring tool from conventional one is that it has a special outside-vent joint installed between safety joint and swivel assembly.
外返孔取心工具与常规取心工具在结构上的根本差异是在安全接头与旋转总成之间设置了一个特殊的外返孔接头。
The wash pipe packing of drilling swivel showed wear-and-tear continually in drilling process due to its structural design. The packing assembly was often torn by high pressure mud.
钻井水龙头由于结构设计的原因，冲管盘根在钻井过程中不断磨损，特别是在高压泥浆的作用下，盘根密封常常被破坏。
Swivel packing seal assembly is the key of the swivel, whose function directly influences its service life, further more, and affects the drilling speed.
盘根密封是(水)龙头的关键环节，其性能直接影响(水)龙头的寿命和钻井速度。
Swivel packing seal assembly is the key of the swivel, whose function directly influences its service life, further more, and affects the drilling speed.
盘根密封是(水)龙头的关键环节，其性能直接影响(水)龙头的寿命和钻井速度。
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