Abstract

The paper discusses an urgent issue of developing an integrated experimental technique for scale inhibitor selection in terms of targeted selection of chemicals and taking into account composition and properties of fluids produced. The authors suggested a technique for determining a set of performance indicators that characterize the influence of a scale inhibitor on adjacent processes. To define an integrated criterion of scale inhibitor effectiveness it is necessary to assess scale inhibitors in terms of their impact on water-and-oil emulsion stability, pH index change of separated water and light absorption coefficient of oil.

Scale inhibitors being used in sub-surface and injection systems of PJSC TATNEFT have undergone laboratory testing to evaluate their effectiveness, and confirmed that the effect of the chemicals on the formation of emulsions and their stability depends on the watercut value. The authors have established the watercut ranges where this impact is the most significant. The watercut interval when the emulsion stability is increasing depends on the type of a scale inhibitor used. It has been found that, when using different scale inhibitors, water-oil emulsions’ ability to disperse grows and improves the emulsion resistance to break down. The paper shows that the scale inhibitor type and watercut value might increase the emulsion stability. There were inhibitor groups distinguished having both positive and negative impact on the formation of an emulsion. It has been observed that the integrated experimental technique in selecting an optimal scale inhibitor makes it possible to perform an integrated assessment of chemical agents considering their inhibitory potential and risk assessment done with the aim of obtaining a long-term systemic effect for extracting crude oil from residual reserves at the late stage of their development.

Key words:

scale inhibitor, watercut, emulsion, stability, pH index, kinetic stability, methodology

References

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Authors

I.A. Guskova, Doctor of Technical Sciences, Professor of the Department "Development and operation of oil and gas fields", Almetyevsk State Oil Institute
2, Lenin st., Almetyevsk, 423450, Russian Federation
E-mail: guskovaagni1@rambler.ru

D.R. Khayarova, Ph.D., associate professor of the department "Development and operation of oil and gas fields", Almetyevsk State Oil Institute, Almetyevsk
2, Lenin st., Almetyevsk, 423450, Russian Federation
E-mail: GilDinara14@mail.ru

R.R. Zakirov, graduate student of the department "Development and operation of oil and gas fields", Almetyevsk State Oil Institute
2, Lenin st., Almetyevsk, 423450, Russian Federation
E-mail: zakirov-rinat-94@yandex.ru

For citation:

I.A. Guskova, D.R. Khayarova, R.R. Zakirov Kompleksnaja jeksperimental'naja metodika vybora ingibitora soleotlozhenij [Integrated experimental technique to select a scale inhibitor]. Neftyanaya Provintsiya, No. 4(28), Part 2, 2021. pp. 393-405. DOI https://doi.org/10.25689/NP.2021.3.393-405 (in Russian)