Table of Contents
Journal of Soft Matter
Volume 2014, Article ID 145352, 7 pages
http://dx.doi.org/10.1155/2014/145352
Research Article

Effect of Gas Permeability and Solubility on Foam

1Department of Geoscience and Engineering, Delft University of Technology, Stevinweg 1, 2628 CN Delft, The Netherlands
2Shell Global Solutions International, Kessler Park 1, 2288 GS Rijswijk, The Netherlands
3Schlumberger Well Services Cementing Norway, Norway

Received 26 August 2014; Revised 10 November 2014; Accepted 10 November 2014; Published 30 November 2014

Academic Editor: Eri Yoshida

Copyright © 2014 Rouhollah Farajzadeh et al. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

Abstract

We perform a study on the influence of gas permeability and solubility on the drainage and stability of foam stabilized with an anionic surfactant. Our study compares the foam stability for four pure gases and two gas mixtures while previous works only compared two pure gases. Drainage and foam-volume-decay rates are calculated from the experimental data and analysed. We find good agreement with existing theory as the foam stability is strongly influenced by the properties of the gas phase, in particular its solubility in the aqueous phase (measured by Henry’s solubility constant, ) and permeability (measured by foam-film permeability coefficient, ). The foam volume decreases considerably with increasing . Moreover, we observe that foams are more stable when a less soluble gas is added to a more soluble gas. Our analysis confirms theories linking drainage, stability, and coarsening rate. Finally, we introduce a new formulation for the foaming index that considers gas solubility and permeability.