Due to the need to finding effective solutions to limit the production of breakthrough gas at the N oilfield in wells No. 1, 2 and 3 pilot works were carried out to test the technology of isolating the gas supply with liquid based on fuel oil F-5. The article presents the results of laboratory study of oil fractional compositions, identified before and after injection of the gas insulating reagent. Studies were performed by the simulated distillation method using a gas-liquid chromatograph Kristall 5000.2 equipped with a flame ionization detector and a capillary column MXT 2887 coated with a non-polar stationary phase, on which hydrocarbon components are separated in accordance which their boiling points. Concentration distribution of hydrocarbon fractions of the studied samples of oil and gas-insulating liquid were plotted, and the dynamics of the fuel oil escape to the surface was traced. Chromatographic method was used to determine the proportion of the gas insulating agent removed from the bottomhole zone. Accuracy of the chromatographic determinations was assessed by comparing the data with the results obtained by measuring the density of stadied samples. According to the study results the treatment by the hydrophobic composition based on fuel oil F-5 did not give positive results on the gas inflow isolation. The analysis of the composition of the liquid removed from the well during development showed the presence of a significant amount of gas insulating mixture. As part of this research, the authors proposed an informative additional method for monitoring the effectiveness of gas isolation technology using dynamics of changes in the hydrocarbon composition of well production when conducting pilot works.
References
1. Khlebnikov V.N., Mishin A.C., Antonov C.B. et al., Search for technological solutions restoration of oil wells after the breakthrough of gas for oil field development viscous oil (In Russ.), Bashkirskiy khimicheskiy zhurnal, 2013, V. 20, no. 3, pp. 95–98.
2. Deliya S.V., Golenkin M.Yu., Byakov A.P., A new approach to performance evaluation geotechnical activities taking into account the effect of reduced gas production breakthrough (In Russ.), Geologiya, geografiya i global'naya energiya, 2014, no. 3, pp. 84–87.
3. Tomskaya L.A., Krasnov I.I., Marakov D.A. et al., Isolation technologies limiting gas influx in oil production wells in Western Siberia (In Russ.), Vestnik Severo-Vostochnogo federal'nogo universiteta im. M.K. Ammosova, 2016, no. 3, pp. 50–60.
4. Vasil'ev V.P., Analiticheskaya khimiya. Fiziko-khimicheskie metody analiza (Analytical chemistry. Physico-chemical methods of analysis), Moscow: Drofa Publ., 2007, 383 p.
