研究结果表明，气顶油藏顶部注氮气重力驱可以有效地提高采收率，达到降水增油的效果；
The results show that oil recovery can be enhanced effectively by gravity drive of crestal nitrogen injection for increasing oil production and decreasing water cut.
严禁在其所连接的气缸水平放置时或者顶部倒置时，使用注气器。
Never use the insufflator if it is connected to a cylinder placed horizontally or one which has its top pointing downwards.
严禁在其所连接的气缸水平放置时或者顶部倒置时，使用注气器。
Never use the insufflator if it is connected to a cylinder placed horizontally or one which has its top pointing downwards.
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