Calculating densities and viscosities of natural gas with a high content of C2+ to predict two-phase liquid-gas flow pattern

IF 4.2 Q2 ENERGY & FUELS Petroleum Pub Date : 2023-12-01 DOI:10.1016/j.petlm.2023.01.001

Yekaterina Moisseyeva, Alexandra Saitova, Sergey Strokin

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Abstract

The paper is devoted to the two-phase flow simulation. The gas-condensate mixture flow in a horizontal pipe under high pressure is considered. The influence of the equation of state (EOS) choice for mixture properties modelling on the flow regime calculation results is studied for gas with high content of methane homologues. An analytical overview of the methods to predict the flow pattern is provided. Based on this analysis, two techniques are selected. For these techniques, values of density and viscosity for each phase are required. Density calculation for the gas phase is performed with Van der Waals based EOS. The propriate EOS is selected based on studies of calculation errors for test mixtures. Calculation of liquid phase density is done by means of Patela-Teja and Guo-Du equations, two different models are considered for viscosity estimation. The flow patterns of gas-condensate mixture in a range of temperatures and pressures are calculated and verified via probability map. The results of study allow to recommend the Brusilovsky EOS for calculation of densities for similar gas mixtures and make more rigorous flow regime evaluation. The probability map shows that for the chosen composition and parameters of media the flow pattern is mostly transitional between segregated and annular independent from EOS.

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计算高 C2+ 含量天然气的密度和粘度，预测液气两相流动模式

本文致力于两相流模拟。考虑了高压下水平管道中的气体-冷凝物混合物流动。针对甲烷同系物含量较高的气体，研究了混合物特性建模的状态方程（EOS）选择对流态计算结果的影响。分析概述了预测流动模式的方法。在此分析基础上，选择了两种技术。这两种技术都需要各相的密度和粘度值。气相的密度计算采用基于范德华的 EOS。根据对测试混合物计算误差的研究，选择合适的 EOS。液相密度计算采用 Patela-Teja 和 Guo-Du 方程，粘度估算采用两种不同的模型。在一定的温度和压力范围内，通过概率图计算并验证了气体-冷凝物混合物的流动模式。根据研究结果，推荐使用布鲁西洛夫斯基 EOS 计算类似气体混合物的密度，并进行更严格的流态评估。概率图显示，在所选介质成分和参数条件下，流动模式大多是介于分离和环形之间的过渡模式，与 EOS 无关。

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来源期刊

Petroleum Earth and Planetary Sciences-Geology

CiteScore

9.20

自引率

0.00%

发文量

审稿时长

124 days

期刊介绍： Examples of appropriate topical areas that will be considered include the following: 1.comprehensive research on oil and gas reservoir (reservoir geology): -geological basis of oil and gas reservoirs -reservoir geochemistry -reservoir formation mechanism -reservoir identification methods and techniques 2.kinetics of oil and gas basins and analyses of potential oil and gas resources: -fine description factors of hydrocarbon accumulation -mechanism analysis on recovery and dynamic accumulation process -relationship between accumulation factors and the accumulation process -analysis of oil and gas potential resource 3.theories and methods for complex reservoir geophysical prospecting: -geophysical basis of deep geologic structures and background of hydrocarbon occurrence -geophysical prediction of deep and complex reservoirs -physical test analyses and numerical simulations of reservoir rocks -anisotropic medium seismic imaging theory and new technology for multiwave seismic exploration -o theories and methods for reservoir fluid geophysical identification and prediction 4.theories, methods, technology, and design for complex reservoir development: -reservoir percolation theory and application technology -field development theories and methods -theory and technology for enhancing recovery efficiency 5.working liquid for oil and gas wells and reservoir protection technology: -working chemicals and mechanics for oil and gas wells -reservoir protection technology 6.new techniques and technologies for oil and gas drilling and production: -under-balanced drilling/gas drilling -special-track well drilling -cementing and completion of oil and gas wells -engineering safety applications for oil and gas wells -new technology of fracture acidizing