Today, the rod pumping is the predominance mechanical recovery mode in world petroleum production.

抽油机井举升方式是目前油田应用最广泛的机械采油方式.

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Some mechanical recovery wells in Chengdao Oilfield produce oil in tubing -- casing annular space.

胜利 埕 岛油田部分机械采油井存在油套环空出油现象.

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