用活动金属挡板及水封井附加控制阀门封闭油罐组排水沟的方法既不可靠又会使流淌火面积扩大。
The method using movable metal baffle and control valve near water sealed well to block the drain of oil tank group is unreliable and it will widen flowing fire area.
由于不用压井就能更换阀门，还不会对油井含油地层造成破坏，从而更好地保护了油气层。
As the valve can be replaced with pressure balance and the oil layer of the oil well can not be damaged, the oil and gas layer is better protected.
由于不用压井就能更换阀门，还不会对油井含油地层造成破坏，从而更好地保护了油气层。
As the valve can be replaced with pressure balance and the oil layer of the oil well can not be damaged, the oil and gas layer is better protected.
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