First wholly-analytical gas volume fraction model for virtual multiphase flow metering petroleum industry applications

Q2 Social Sciences
A. Nagoo
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引用次数: 0

Abstract

In this seminal contribution, the world’s first wholly-analytical gas volume fraction multiphase flow model is formulated and demonstrated in virtual flow meter and production allocation field applications for its differentiated ability to achieve improved reliability of phase flow rate calculations given pressure and temperature measurements at two different locations along multiphase production systems. The presented simple gas volume fraction equation is explicit in form and is validated against both lab data and oilfield flowline data. A crucial requirement for differential pressure flow meters for multiphase production systems, particularly wet gas systems in annular and annular-mist flows, is the calculation of the averaged gas volume fraction. Additional calculations include multidirectional entrainment calculations, which strongly affect the simultaneous entrainment of liquids in the gas phase and the gas in the liquid phases. Historically, prior published gas volume fraction two-phase flow models had closure relations and artificial adjustment (fitting) factors linked to controlled lab-scale conditions involving immiscible fluids that bear no resemblance to the complex petroleum mixtures undergoing phase change in uncontrolled long wellbore and flowline environments. Thus, ambiguous extrapolations were necessary leading to increased uncertainties. Using an asymptotic approximation analysis approach, an analytical gas volume fraction equation is derived that overcomes this empirical-based restriction. In terms of comprehensive validation, the presented analytical gas volume fraction equation is demonstrated first for its ability to reliably reproduce over 2600 two-phase annular and annular-mist flow experimental datasets inclusive of circular and non-circular conduits. Secondly, readily available published experimental data of both constant-diameter as well as variable-diameter sub-critical to critical choke two-phase flows are used for model validation in scenarios involving different flow obstructions. Lastly, an offshore subsea flowline dataset is used to demonstrate the improved reliability of the new equation at field-scale operational conditions.
第一个用于虚拟多相流计量的全解析气体体积分数模型——石油工业应用
在这一开创性的贡献中,建立了世界上第一个全分析气体体积分数多相流模型,并在虚拟流量计和生产分配领域应用中进行了演示,因为它在多相生产系统的两个不同位置进行压力和温度测量的情况下,具有提高相流量计算可靠性的区分能力。所提出的简单气体体积分数方程形式明确,并通过实验室数据和油田采气管线数据进行了验证。多相生产系统,特别是环形和环形雾流中的湿气系统的差压流量计的关键要求是计算平均气体体积分数。附加计算包括多向夹带计算,其强烈影响气相中液体和液相中气体的同时夹带。从历史上看,先前发表的气体体积分数两相流模型具有闭合关系和人工调整(拟合)因素,这些因素与涉及不混溶流体的受控实验室规模条件有关,这些不混溶液体与在不受控制的长井筒和采出管线环境中发生相变的复杂石油混合物没有相似之处。因此,不明确的推断是必要的,导致不确定性增加。使用渐近近似分析方法,导出了一个分析气体体积分数方程,该方程克服了基于经验的限制。在综合验证方面,首次证明了所提出的分析气体体积分数方程能够可靠地再现2600多个两相环形和环形雾流实验数据集,包括圆形和非圆形管道。其次,在涉及不同流动障碍的情况下,使用现成的已发表的恒定直径和可变直径亚临界至临界扼流器两相流的实验数据进行模型验证。最后,使用海上海底采气管线数据集来证明新方程在现场规模操作条件下的可靠性提高。
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来源期刊
International Journal of Energy Production and Management
International Journal of Energy Production and Management Social Sciences-Sociology and Political Science
CiteScore
2.20
自引率
0.00%
发文量
24
审稿时长
26 weeks
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