Application of time-domain gating technique in water content measurement of gas–liquid two-phase flow

2021 ◽  
Vol 92 (9) ◽  
pp. 094702
Author(s):  
Yihang Tu ◽  
Lin Qin ◽  
En Li ◽  
Huimin Ma ◽  
Yunpeng Zhang ◽  
...  
Keyword(s):  
Water Content ◽  
Time Domain ◽  
Two Phase Flow ◽  
Phase Flow ◽  
Two Phase ◽  
Content Measurement

Effect of Common Impurities on the Phase Behavior of Carbon-Dioxide-Rich Systems: Minimizing the Risk of Hydrate Formation and Two-Phase Flow

SPE Journal ◽  
2011 ◽  
Vol 16 (04) ◽  
pp. 921-930 ◽  
Author(s):  
Antonin Chapoy ◽  
Rod Burgass ◽  
Bahman Tohidi ◽  
J. Michael Austell ◽  
Charles Eickhoff
Keyword(s):  
Experimental Data ◽  
Carbon Dioxide ◽  
Phase Behavior ◽  
Water Content ◽  
Thermodynamic Model ◽  
Two Phase Flow ◽  
Hydrate Formation ◽  
Experimental Methodology ◽  
Phase Flow ◽  
Two Phase

Summary Carbon dioxide (CO2) produced by carbon-capture processes is generally not pure and can contain impurities such as N2, H2, CO, H2 S, and water. The presence of these impurities could lead to challenging flow-assurance issues. The presence of water may result in ice or gas-hydrate formation and cause blockage. Reducing the water content is commonly required to reduce the potential for corrosion, but, for an offshore pipeline system, it is also used as a means of preventing gas-hydrate problems; however, there is little information on the dehydration requirements. Furthermore, the gaseous CO2-rich stream is generally compressed to be transported as liquid or dense-phase in order to avoid two-phase flow and increase in the density of the system. The presence of impurities will also change the system's bubblepoint pressure, hence affecting the compression requirement. The aim of this study is to evaluate the risk of hydrate formation in a CO2-rich stream and to study the phase behavior of CO2 in the presence of common impurities. An experimental methodology was developed for measuring water content in a CO2-rich phase in equilibrium with hydrates. The water content in equilibrium with hydrates at simulated pipeline conditions (e.g., 4°C and up to 190 bar) as well as after simulated choke conditions (e.g., at -2°C and approximately 50 bar) was measured for pure CO2 and a mixture of 2 mol% H2 and 98 mol% CO2. Bubblepoint measurements were also taken for this binary mixture for temperatures ranging from -20 to 25°C. A thermodynamic approach was employed to model the phase equilibria. The experimental data available in the literature on gas solubility in water in binary systems were used in tuning the binary interaction parameters (BIPs). The thermodynamic model was used to predict the phase behavior and the hydrate-dissociation conditions of various CO2-rich streams in the presence of free water and various levels of dehydration (250 and 500 ppm). The results are in good agreement with the available experimental data. The developed experimental methodology and thermodynamic model could provide the necessary data in determining the required dehydration level for CO2-rich systems, as well as minimum pipeline pressure required to avoid two-phase flow, hydrates, and water condensation.

scholarly journals Pattern transitions of oil-water two-phase flow with low water content in rectangular horizontal pipes probed by terahertz spectrum

2015 ◽  
Vol 23 (24) ◽  
pp. A1693 ◽  
Author(s):  
Xin Feng ◽  
Shi-Xiang Wu ◽  
Kun Zhao ◽  
Wei Wang ◽  
Hong-Lei Zhan ◽  
...  
Keyword(s):  
Water Content ◽  
Two Phase Flow ◽  
Phase Flow ◽  
Two Phase ◽  
Horizontal Pipes ◽  
Terahertz Spectrum ◽  
Oil Water

Reliable Evaluation of Oil–Water Two-Phase Flow Using a Method Based on Terahertz Time-Domain Spectroscopy

2017 ◽  
Vol 31 (3) ◽  
pp. 2765-2770 ◽  
Author(s):  
Yan Song ◽  
Xinyang Miao ◽  
Kun Zhao ◽  
Honglei Zhan ◽  
Chen Jiang ◽  
...  
Keyword(s):  
Time Domain ◽  
Two Phase Flow ◽  
Phase Flow ◽  
Terahertz Time Domain Spectroscopy ◽  
Two Phase ◽  
Time Domain Spectroscopy ◽  
Oil Water
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