Laboratory Test for Enhanced Oil Recovery with Gellan

S. E. Kudaibergenov, Zh. M. Adilov, N. Nuraje, A. A. Sagindykov, G. S. Tatykhanova, I. Sh. Gusenov, R. Sh. Ibragimov

Abstract


This paper contains a brief literature survey on polymer flooding to enhance the oil recovery and the experimental results devoted to study of the efficiency of natural polysaccharide – gellan as an oil displacement agent in comparison with water and poly(acrylamide) (PAA), the latter is traditionally used in oil industry. A series of core materials having terrigeneous and carbonate nature were studied. The porosity and permeability of core materials were determined. Sol-gel transition of polysaccharide – gellan was studied in the presence of NaCl, KCl, СаCl2, МgCl2, and BaCl2. It was found that the effectiveness of salts to enhance gelation of gellan changes in the following order: Ba2+ > Са2+ ≈ Мg2+ > K+ > Na+. The gel-sol transition of gellan was observed in oil field water with salinity up to 73 g/L. Influence of storage time and temperature on the viscosity of gellan was evaluated. Comparative laboratory experiments on water flooding and polymer flooding methods were carried out on sand-packed model. It was shown that both gellan and PAA show almost equal values of oil displacement coefficient which is equal to 60-65 % while injection of water gives only 30-32 %. Oil displacement process was visualized on cross sections of sand-packed model. Optimal concentration of gellan solution for oil displacement which depends on absolute permeability of rock was found.

Keywords


Gellan; poly(acrylamide); terrigenous and carbonate rocks; sand packed model; water flooding; polymer flooding; oil displacement

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