One of the traditional methods of enhanced oil recovery is the polymer solutions usage, particularly, polyacrylamide solutions. Despite the undeniable advantages of polyacrylamide, high adsorption reduces its economic efficiency. To reduce adsorption and reduce the initial concentration of polyacrylamide, the use of substances containing chromium ions, which link the macromolecules and form crosslinked polymer solutions, has been proposed. The research was conducted on the static adsorption of solutions of linear and crosslinked anionic polyacrylamides of two grades - SNF FP 307 and partially sulfonated SNF AN 125 SH using optical and spectral methods. The research of static adsorption of linear polyacrylamide solutions was carried out according to the photo colorimetric method based on API RP63. It was demonstrated that sulfonated and hydrolyzed polyacrylamide is less prone to adsorption than only hydrolyzed. The research of the adsorption of crosslinked polyacrylamide solutions by colorimetry was impossible; therefore, the evaluation of polyacrylamide solution adsorption after chromium acetate crosslinking was performed indirectly by changing the chromium concentration, which was determined by
X-ray fluorescence analysis. The dependence of the solutions transmittance at a wavelength of 490 nm on the concentration of polyacrylamide of two grades was determined in the range of 0-300 ppm on the KFK-2 colorimeter. Also, in the course of the research, the dependence of the intensity of the analytical line of Cr in the polyacrylamide solution on the chromium concentration was determined in the range of 0-27 ppm on the Thermo Scientific ARL Perform'X spectrometer with wavelength dispersion. It has been established that these dependences are linear in the concentration range covered. Thus, it has been demonstrated that the combination of optical and spectral methods allows determining the concentration change of both linear and crosslinked polyacrylamide in solutions.
1. Zakharov V.P., Ismagilov T.A., Telin A.G., Silin M.A., Neftepromyslovaya khimiya. Regulirovanie fil'tratsionnykh potokov vodoizoliruyushchimi tekhnologiyami pri razrabotke neftyanykh mestorozhdeniy (Regulation of filtration flows by waterproofing technologies in the development of oil fields), Moscow: Publ. of Gubkin University, 2011, 261 p.
2. Silin M.A., Magadova L.A., Tolstykh L.I., Davletshina L.F., Khimicheskie reagenty i tekhnologii dlya povysheniya nefteotdachi plastov (Chemicals and technologies for EOR), Moscow: Publ. of Gubkin University, 2015, 145 p.
3. Gaillard N., Thomas A., Giovannetti B. et al., Selection of customized polymers to enhance oil recovery for high temperature reservoirs, SPE 177073-MS, 2015, DOI:10.2118/177073-MS.
4. Aalaie J., Vashenghani-Ferahani E., Swelling behavior of sulfonated polyacrylamide nanocomposite hydrogels in electrolyte solutions: comparison of theoretical and experimental results, Iranian Polymer Journal, 2012, V. 21, no. 3, pp. 175–183.
5. Yan C., Guraieb P., Ghorbani N. et al., Produced water analysis by X-Ray fluorescence with and without the presence of crude oil, SPE 188225-MS, 2017, DOI: 10.2118/188225-MS/
6. Houwen O.H., Gilmour A., Sanders M.W. et al., Measurement of composition of drilling mud by X-Ray fluorescence, SPE 25704-MS, 1993, DOI:10.2118/25704-MS/
7. Krupin S.V. et al., The effect of adsorption of industrial polyacids on the permeability of porous silica media (In Russ.), Zhurnal prikladnoy khimii, 1987, V. 40, no. 9, pp. 2134–2137.
8. Holmberg K., Jönsson B. et al., Surfactants and polymers in aqueous solution, John Wiley & Sons, 2002, 562 p.
9. Pecherskiy G.G., Kuskil'dina Yu.R., Antuseva A.V., Kazak M.V., Optimization of operational characteristics of polymer-dispersed systems aimed at increasing oil production of petroleum strata (In Russ.), Polimernye materialy i tekhnologii, 2015, V. 1, no. 2, pp. 68–74.
10. Akimkhan A.M., Adsorption of polyacrylic acid and polyacrylamide on montmorillonite (In Russ.), Zhurnal fizicheskoy khimii = Russian Journal of Physical Chemistry A, 2013, V. 87, no. 11, pp. 1898–1903.
11. Smith F.W., The behavior of partially hydrolysed polyacrylamide solutions in porous media, Journal of Petroleum Technology, 1970, V. 22, pp. 148–156.