The efficiency of oil recovery with water flooding process is poor in low-permeability oil reservoirs.
低渗透油藏注水开发效果差、采收率低，而采用气驱技术是动用此类难采储量的有效方法之一。
Reverse recovery can provide shorter recovery time and higher efficiency.
逆向恢复具有更短的恢复时间和更高的效率。
Heat recovery system with revolving air preheater can keep the heat efficiency above 86%.
采用回转式空气预热器的热回收系统，可以使加热炉热效率保持在86%以上。
Pumping recovery well has a low efficiency in system generally at present.
抽油机井目前普遍存在系统效率偏低的问题。
Pumping recovery well has a low efficiency in system generally at present.
抽油机井目前普遍存在系统效率偏低的问题。
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