a hydraulic self-sealed swabbing wellhead assembly with anticollision crown
液力自封防碰抽汲井口装置
electric control system of wellhead assembly based on expert pid control system
基于专家PID控制器的节流压井管汇电气控制系统
the base of the injector head is secured to the wellhead pressure-control equipment by the stripper assembly mounting system.
注入头的底部由环状橡胶芯子固定系统固定于井口压力控制设备。
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