原油采收率η=∑Q’/∑Q’’，式中∑Q’──—指定时间内的总采收量；∑Q──—特定油田的可采储量。在实际条件下，原油采收率必须按照这个公式计算。但是许多从事三次采油的专家还沿用η=I·h，式中I──—线性驱替系数（根据实验研究数据确定），h──—来自注水井的波及系数。在市场经济条件下，这是不容许的。 The crude oil recovery rate η = ΣQ ’/ ΣQ’ ’, where ΣQ’──- the total amount of recovery within the specified time; ΣQ ─ ─ - recoverable reserves of specific oil fields. Under actual conditions, the recovery rate of crude oil must be calculated according to this formula. However, many of the experts engaged in tertiary oil production also use η = I · h, where I─── linear displacement coefficient (determined from the experimental data), and h───flooding factor from the injection well. In a market economy, this is not allowed.