注采比是指油田注入剂（水，气）地下体积与采出液量（油，气，水）的地下体积之比。用它衡量注采平衡情况。
利用自喷转抽提液方法，放大生产压差，降低注采比。
The production pressure differential can be increased and the injection-production ratio can be reduced by transferring from flowing to pumping.
在理想情况下注采比的变化趋势是随注水时间的延续趋近1。
In the ideal condition, injection to production ratio turns out to become 1 as the time of waterflood lasts.
给出了考虑注采比和启动压力梯度的平均地层压力和边界压力的确定方法。
The method is presented to determine formation average pressure and boundary pressure with threshold pressure gradient and injection-production ratio.
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