This study shows that for improving development effect in the cyclic flooding, order of roles played by various forces are: capillary force, elastic force, while gravity plays no part in it basically.
研究表明，在周期注水改善开发效果中，各种力所起的作用大小不同，毛管力的作用是主要的，弹性力的作用是次要的，重力基本不起作用。
At last it bring forward some new ideas for improving the development effect of thick oil reservoir.
为改善厚油层开发效果提出了一些新的思路。
But the researches based on the mechanism of advanced water injection improving the effect of exploration and the development technique policy of advanced water injection are few.
但对超前注水改善开发效果机理以及超前注水开发技术政策的研究较少。
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