Micro-bubble surfactant multi-layer (MBSML) drilling fluids are included in the drilling operation of low pressure reservoirs. These fluids contain tiny dispersed micro-bubbles coated with two surfactant layers. For the stability evaluation of these fluids in operational conditions, surfactant type, concentration, pressure and temperature effects on the size of micro-bubble fluid, should be scrutinized. For investigating these variables, a diffusion model for solute transport in micro-bubble fluids was proposed with the mass transfer concept. The model included mass transfer resistance of fluid phases and interfaces. It was observed that the bubble sizes decrease as a result of adding surfactant to the fluid. However, there were pressure, temperature and surfactant concentration thresholds for the bubble stability.

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Ali Alizadeh, received the MSc and BSc degrees in reservoir engineering from Sharif University of Technology, and Ph.D. degree in the Amirkabir University of Technology.Ehsan Khamehchi received his BSc, MSc and Ph.D. all from Amirkabir University of Technology, in Mining, Petroleum Reservoir and Chemical & Reservoir Engineering.