用多相管流理论计算抽油井井底流压

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分布情况：从动流面到井口段按纯气柱计算；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。

Predicting Flowing Bottom-hole Pressure in Pumping Wells with Vertical Multiphase Flow Theory

On the basis of new research results in vertical multiphase flow and taking into account our oilfield conditions,a method for predicting flowing bottom-hole pressure in pumping wells is presented.In the method, fluid flowing is divided into three segements from bottom-hole to surface.The pressure drop in the segement from bottom-hole to pump intake may be predicted by the pressure gradient prediction model in vertical multiphase flow of Hagedorn and Brown, one from pump intake to fluid level predicted with zero-net liquid flow theory,and one from fluid level to surface considered as a gas column. Seeing that the gas production of pumping wells is not measured in our oilfield,the annulus gas flow rate based on the reservoir gas oil ratio may be calculated taking into consideration that the casing-tubing area is separated freely and by a gas anchor.It is shown that results better than S curve method used commonly may be obtained by using this method.