水平井多点注汽管柱中流体流动压力计算与分析

Analysis and Calculation of Flow Pressure in Multipoint Steam Injection String of Horizontal Well

水平井多点注汽管柱是热采水平井高效注汽常用井下装置,如何合理设计孔阀分布,保证管柱轴向上各孔出气量均匀,仍没有很好的解决。根据管道内流体流动的动量、能量及质量平衡关系,建立了水平井多点注汽管柱内流体流动压力分布方程,在此基础上,提出了多点注汽管柱的设计方法。具体实例计算结果表明,该设计方法可以保证管柱轴向上多个孔阀出气量均匀,满足水平井段均匀注汽的工艺要求。

The multipoint steam injection string of a horizontal well is a commonly used downhole device for high efficiency steam injection of thermal recovery horizontal well.A reasonable layout of the valves to ensure an even steam output of each point is still not well designed.At present,ageneral design method which is urgently needed isn't applied.According to the balance relationship of the momentum,the energy and the mass of the fluid flowing in the string,the pressure distribution equation of the fluid flowing in the multipoint steam injection string is built.On the basis of this equation,the design calculation method of the multipoint steam injection string is proposed.A specific example is given in the paper.Study shows that with the equation built in this paper,the string can be designed with each axial valve having the same output,so that it can meet technical demand of an even steam injection of the horizontal well.