延长油矿管理局在蟠龙、子长等主生产区经常遇到严重漏失井，直接影响了钻井速度。
In Yanchang oilfield, serious lost circulation often occur during drilling in Panlong and Zichang areas, directly affect drilling rate.
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。
Swivel packing seal assembly is the key of the swivel, whose function directly influences its service life, further more, and affects the drilling speed.
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