Effect of Fluid Viscosity on Asphalthene Deposition Rate during Turbulent Flow in Oil Wells
Gholamreza Vakili-Nezhaad,
Nabeel Al-Rawahi,
G. Ali Mansoori,
Amin Fatemi
Issue:
Volume 1, Issue 2, July 2013
Pages:
45-49
Received:
26 June 2013
Published:
10 July 2013
Abstract: The production and transportation of petroleum fluids will be severely affected by the deposition of suspended particles (i.e. asphaltenes, diamondoids, paraffin/wax, sand, etc.) in petroleum fluid production wells and/or transfer pipelines. Viscosity variations of petroleum fluid are an important phenomenon that could have significant effect on different properties related to petroleum fluid. Therefore, it is important to understand the effect of viscosity variations of petroleum fluid onthe deposition rate of suspended particles on the walls of the flowing channel. In this study, the analytical model for the prefouling behavior of suspended particles in production lines ischallenged in terms of viscosity changes that occur during the production in oil wells/tubings fora typical fluid sample experiencing particle deposition. Calculations of particle deposition rate inoil wells/tubings considering the change in viscosity for this typical oil sample is taken into consideration. The analysis presented in this report shows that rates of particle deposition (during petroleum fluid production) on the walls of the oil well/tubing is slightly effected by the viscosity variations that occur during the production conditions and it is also shown that the assumption of constant viscosity while deriving the analytical model for the deposition rate of particles on the walls of fluid conduits is quite a reasonable and valid assumption.
Abstract: The production and transportation of petroleum fluids will be severely affected by the deposition of suspended particles (i.e. asphaltenes, diamondoids, paraffin/wax, sand, etc.) in petroleum fluid production wells and/or transfer pipelines. Viscosity variations of petroleum fluid are an important phenomenon that could have significant effect on di...
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Effects of Surfactant on Bubble Size Distribution and Gas Hold-up in a Bubble Column
Maedeh Asari,
Faramarz Hormozi
Issue:
Volume 1, Issue 2, July 2013
Pages:
50-58
Received:
30 June 2013
Published:
20 July 2013
Abstract: This study investigates the influence of two surfactants –a non-ionic (Tween20) and a zwitterionic (Cocoamidopropyl Betaine) – upon the gas-liquid hydrodynamics in a bubble column. These kinds of substances can have an important influence upon the gas-liquid hydrodynamics, specifically on the bubble size and gas hold-up. Bubble diameters were measured photographically in a bubble column, which was operating in the homogeneous regime with air and aqueous surfactant solutions. The bubble size and gas hold-up data were determined for several values of the superficial gas velocity (0.13, 0.26 and 0.5 cm/s). On the other hand, bubble diameter was determined for different values of surfactant concentration (0.02, 0.05 and 0.1 %vol). At superficial gas velocity below 0.26 cm/s, addition of surfactant in air-water has low influence on bubble size, whereas higher gas velocity addition of surfactant increases the number of bubble. In surfactant solutions (in comparison with pour water), resulted in an increase in number of bubble and a rough decrease in Sauter mean bubble diameter. Bubbles tend to become smaller with decreasing surface tension of water. Therefore, surfactant existence increases the gas hold-up. Further, gas holdup increased when gas bubbles movement increased.
Abstract: This study investigates the influence of two surfactants –a non-ionic (Tween20) and a zwitterionic (Cocoamidopropyl Betaine) – upon the gas-liquid hydrodynamics in a bubble column. These kinds of substances can have an important influence upon the gas-liquid hydrodynamics, specifically on the bubble size and gas hold-up. Bubble diameters were meas...
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