Insights into CO2 Foaming Behavior of Ethoxylated Amines

Switchable ethoxylated amine surfactants are readily soluble in CO2 and high-saline brines. The objective of the current work is to maximize foamability stability foam at 150 °F (65 °C) through adjustments surfactant concentration, pH, brine salinity. From results, authors recommend potential applications Ethomeen C12 (EC12) for oil/gas industry. Foam tests helped determine optimum parameters 77 (25 °C). surface tension EC12 as a function concentration was evaluated using drop-shape analyzer. Maximum observed solution comprising 1.5 wt% EC12, 25 NaCl, pH 6.5 interactions with salts allowed closer packing molecules lamellae strengthening foam. At 2.5, absence salt led poor stability. However, same presence sodium chloride, stable longer periods time due influence. gradients had direct relationship There strong resistance degradation when multivalent ions were present surfactant.