Abstract
This study investigates the stability of foam in drilling fluid, focusing on the impact of surfactant (sodium dodecyl sulfate) and hydroxyethyl cellulose polymer. The research analyzes various influential factors and examines three rock types (carbonate, limestone, and sandstone) commonly encountered in drilling operations. Additionally, the study explores the behavior of drilling cuttings from light, medium, and heavy reservoir oil types (Bangestan, Asmari, and Soroush) found in Iranian oil fields. The influence of salinity, specifically divalent (calcium) and monovalent salts (sodium), on foam performance is also investigated.Experimental findings reveal that higher concentrations of critical micelle concentration do not significantly affect foam stability, but are used in preparing the foaming solution. Furthermore, different polymer concentrations (ranging from 0% to 0.5%) enhance foam stability, except at a concentration of 0.5% where foam formation is impeded. Interestingly, the transfer of more stable foam and a greater volume of cuttings to the surface is facilitated in sandstone layers. The presence of heavy oil significantly impacts the rate of cuttings transfer compared to lighter oils.
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