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以多相流理论为基础，结合我国油田的具体情况，介绍了一种计算抽油井井底流压的方法。该方法分３段分别考虑抽油井从井底经环空到井口的压力分布情况：从动液面到井口段按纯气控计算；从泵入口到动液面的环空含气油柱段采用零静液流理论计算；从井底到泵入口段采用Ｈａｇｅｄｏｒｎ－Ｂｒｏｗｎ的方法计算。此外，考虑到国内油田对抽油井的产气量往往不测或测不准的实际。情况，以地层油气比为基础，计算泵入口处的自由气量，按油套管截面自由分离和气锚分离计算出环空气流量。实测资料验证结果表明，该方法的计算精度高于目前普遍采用的Ｓ曲线法。
Based on the theory of multiphase flow, combined with the specific conditions of oilfields in our country, a method for calculating the bottom hole flow pressure in pumping wells is introduced. The method divides into three sections respectively to consider the pressure distribution of the pumping well from the bottom of the well to the well head through the annular space: the purely gas-controlled calculation from the driven liquid surface to the wellhead section; the annular gas-containing oil column section from the pump inlet to the moving liquid surface Zero-flow theory is used to calculate; from the bottom to the pump inlet section using Hagedorn-Brown method. In addition, taking into account the domestic oil field gas pumping wells are often unpredictable or measured the actual measured. Based on the formation oil-gas ratio, the free-air volume at the pump inlet was calculated and the annular air flow was calculated according to the free separation of the oil casing section and the gas-anchor separation. The test results show that the accuracy of this method is higher than the S-curve method commonly used today.