Gravitydrive becomes effective in the late stages of production on some gas-drive oil reservoirs.
有某些气驱油藏的开采晚期，重力驱动变得有效。
2
Gravitydrive is effective in the early stages of reservoir development only when there is high relief in the reservoir rock and oil column.
重力驱动仅在储层岩石中存在高闭合度和油柱的情况下在储层开发的早期是有效的。
3
The results show that oil recovery can be enhanced effectively by gravitydrive of crestal nitrogen injection for increasing oil production and decreasing water cut.