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Journal of Applied Sciences
Year: 2014  |  Volume: 14  |  Issue: 23  |  Page No.: 3339 - 3343

Solubility of Foam Surfactants in High Divalent Ions at High Temperature

Muhammad Khan Memon, Muhannad Talib Shuker and Khaled Abdalla Elraies    

Abstract: In Water Alternating Gas (WAG) injection processes, injected gas suffers from poor sweep efficiency due to low gas density, low gas viscosity leading to gravity segregation, override and viscous fingering. The oil recovery during the process remains low due to the problems of gravity segregation and viscous fingering. Foam surfactant is used to reduce gas mobility by increasing its apparent viscosity and improve volumetric sweep efficiency but the foam efficiency decreases in the presence of crude oil, divalent ions and high reservoir temperature. The main objective of this study is the screening of foam forming surfactants for CO2 mobility control during water alternating gas injection process in the presence of maximum divalent ions at high temperature. Alpha Olefin Sulfonate (AOS) was selected as main surfactant. Solubility test of AOS with different brine was performed at 120°C. AOS was stable in the total brine salinity of 78568 ppm with 3265 ppm of calcium ions and 1434 ppm of magnesium ions. To maximize the range of divalent ions, Lauramidopropylamide Oxide (LMDO) was blended with AOS. The solution was stable in the presence of total salinity 78358 ppm with 4082 ppm of calcium ions and 1793 ppm of magnesium ions at 120°C. The aqueous stability over a range of divalent ions and temperature was improved by blend of surfactants and this will help for generating stable foam for CO2 mobility control.

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