水平井筒变质量环空流压降分析模型

在常规管道环空流流型压降分析的基础上 ,考虑管壁存在入流或出流对于环空流流型压降的影响 ,对气、液两相分别应用质量守恒方程和动量守恒方程 ,得到水平井筒气液两相变质量流动环空流流型的压降计算方法 .计算结果表明 :水平井筒气液两相变质量流动环空流流型的压降大于常规水平管道的压降 ;入流量越大 ,压降越大 ;管径越大 ,压降越小 ;要计算整个水平段压力分布 ,还需要结合井筒的流型判别以及其它流型的压降计算方法

Analytic Model of the Pressure Drop of the Variable-mass Gas-liquid Annular Flow in the Wellbore of a Horizontal Hole

when there is the inlet flow through perforation channels, the flow in a horizontal borehole is variable mass flow. when fluid layer or film flows on the wall of a pipeline and gas flows on the fluid layer or film at the centre of the pipeline, the gas liquid two phase flow is called as gas liquid annular flow. The formula of calculating the pressure drop of the variable mass gas liquid annular flow in a horizontal pipeline was derived based on the analysis of the gas liquid two phase flow in a horizontal pipeline. It is shown that the pressure drop of the variable mass gas liquid annular flow is greater than that of the general gas liquid flow;the greater the flow rate of the inlet flow, the greater the pressure drop; the greater the diameter of the pipeline, the less the pressure drop.Because it is impossible that the variable mass gas liquid flow in a horizontal borehole is annular flow in whole horizontal interval, to determine the pressure distribution in whole horizontal interval must combine with the judgement of flow pattern and calculating formulas of the pressure drop of other flow patterns.