我国低渗透油藏的天然弹性能量普遍较小，所以基本上都先后采取了注水保持压力的开发方式。
The original elastic energy in low permeability reservoir is generally small, so all the oil fields early or late adopt water flooding to keep the pressure of the low permeability reservoir.
对于注水开发砂岩油田，保持合理的地层压力既关系到油田开发效果，又影响到油田开发总体效益。
In a water flooded sandstone oilfield, keeping a reasonable formation pressure is important for both the development effect and the total development benefit.
注水是保持地层压力、提高原油采收率的主要措施之一。
Water injection is one of the major measures to keep formation pressure and improve oil recovery.
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