The effect of surfactant and compositions of oil with different viscosity on stability of air-foam and CO2-foam
Volume Title: 1
Authors
1Department of Petroleum Engineering, Faculty of Chemical Engineering, Tarbiat Modares University, Tehran, Iran
2گروه مهندسی نفت، دانشکده مهندسی شیمی، دانشگاه تربیت مدرس، تهران، ایران
Abstract
Gas injection has widely used in oil industry for EOR. However, it has some problems such as uptake and fingering due to low density of gas. Foam increase apparent viscosity of gas which reduce gas relative permeability and finally improves this method. Combination of water and gas does not have enough stability. So, use of surfactant is common to increase the foam stability.
In this project, stability of foam generated by Cetyltrimethylammonium bromide (CTAB) is studied. Then, foam stability in presence of normal heptane and toluene, has been investigated. In addition, CO2 and air were used for foam generation. For studying of foam stability, after the foam has been generated in bulk by static ‘mixing’ method, the foam column decay was monitored to measure half time.
The results show the CTAB surfactant increase foam stability and has acceptable foamability. Air-foam has more stability compared with CO2-foam. Regarding the effect of normal heptane and toluene, the presence of these components reduces foam stability that this reduction be greater if saturation of this components increased. It is also observed if viscosity of a component be greater than the other, foam stability improved.
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