Demulsification of W/O emulsion at petroleum field and reservoir conditions using some demulsifiers based on polyethylene and propylene oxides

A.M. Alsabagh, M.E. Hassan, S.E.M. Desouky, N.M. Nasser, E.A. Elsharaky, M.M. Abdelhamid
2016 Egyptian Journal of Petroleum  
In this work, polymer molecules of alkene oxides diesters with varying HLB values and molecular weights () were synthesized, elsewhere (Alsabagh et al., 2016) . The demulsification efficiency was evaluated at field and reservoir conditions. At field conditions (60°C and 1 atm) the data revealed that the maximum demulsification efficiency was obtained by ED 3 and PD 3 at 60°C, 600 ppm after 55 and 40 min, respectively. At reservoir conditions (85°C and 5000 psi), the PD 3 and ED 3 showed also
more » ... ED 3 showed also the maximum demulsification efficiency was 76% and 70%, respectively, in spite of the 2% from the blank emulsion (12% BS&W) separated after 7 days. The interfacial tension (IFT) at the crude oil/water interface was measured for PD 3 and ED 3 . From the results, it was found that the values of IFT were 0.7 and 0.8 mN m À1 respectively. The rheological behavior of the same demulsifiers was investigated. The results showed that the demulsifiers PD 3 and ED 3 enhance the dynamic viscosities (3.9 and 3.8 mPa s, respectively) and the (s B ) yield values were 0.77 and 1.23 Pa s, respectively at temperature 85°C, whereas, they were 3.95 mPa s and 1.5 Pa s for the blank emulsion sample.
doi:10.1016/j.ejpe.2016.05.008 fatcat:voknoj7tsvajto6nrxuewxav3a