Studying Properties of Polymer Solutions and Efficiency of Crude Oil Displacement in Specific Conditions of Deposits in Southwestern Yakutia

DOI : http://dx.doi.org/10.13005/bbra/1476

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This paper studies features of rheological behavior and the level of oil displacement for solutions with various concentrations of carboxymethylcellulose (CMC) and polyethylene glycol (PEG) in the conditions of collectors with low reservoir temperatures and high mineralization of reservoir water. The purpose of this study is the searching for and adaptation of existing technological methods for displacement in conditions of oil extraction in deposits of the Republic of Sakha (Yakutia). Physicochemical oil-displacing properties of CMC and PEG polymers were studied at the laboratory, which showed that tested displacement solutions based on Na-CMC 5.7 g/l of PEG and 30 g/l have high values of Oil Recovery Factor (ORF) and can be recommended for practical use. However, in order to substantiate the use of the polymer flooding method, the expected technological effect manifested in additional delivery of oil and increased ORF is not enough. Therefore, we calculated the cost-effectiveness on the basis of comparing incurred cost of the basic variant and development using water-soluble polymers. Calculations showed that the use of PEG would be unprofitable, since costs of the activity and crude oil production exceeds the revenue from selling the produced oil. Thus, in order to improve the flooding method in deposits of the southwestern Yakutia, it is recommended, according to comprehensive research, to use carboxymethylcellulose solution at a concentration of 5 g/l as the base displacing agent.

Carboxymethyl cellulose (CMC); Polyethylene glycol (PEG); Oil recovery; Specific layer conditions