For the operating conditions of the Romashkinskoye field, a comprehensive technology of simultaneous water and gas (SWAG) injection with the extraction of associated gas from the annular spaces of producing wells was proposed. Fresh and salty highly mineralized water was used when pumping water-gas mixtures (WGM) by the pump-ejector system. Experiments on WGM injection started using fresh water from the reservoir pressure maintenance (RPM) system and associated petroleum gas (APG) from producing wells. The pump-ejector system operated stably, without supply disruptions, and provided a WGM injection pressure of at least 20 MPa. But in the case of APG injection with fresh water, the injection pressure of the mixture steadily increased over time and reached limiting values for the ground equipment of the RPM system and injection wells, then it was necessary to turn off the pump-ejector system. When using salt water, the injection pressure of the mixture first increased, then, having passed through a maximum (10,7-10,8 MPa), 40 hours after the start of the pump-ejector system it was about 9 MPa. Field tests confirmed the operability and stable operation of the pump-ejector system at WGM injection pressures of up to 20 MPa and a decrease in the annular pressure from 3 MPa to atmospheric, revealed the problem of hydrate formation when using fresh water with Devonian associated petroleum gas, and enabled to establish that the use of salty highly mineralized water completely solves the problem of hydrate formation and a decrease in the injectivity of injection wells during SWAG treatment of the formation.
References
1. Suleymanov B.A., Teoriya i praktika uvelicheniya nefteotdachi plastov (Theory and practice of enhanced oil recovery), Moscow –Izhevsk: Publ. of Institut komp’yuternykh issledovaniy, 2022, 288 p.
2. Akhmadeyshin I.A., On the technological schemes wag with simultaneous injection gas and water (In Russ.), Neftyanoe khozyaystvo = Oil Industry, 2014, no. 6,
pp. 104–105.
3. Drozdov A.N., Utilization of associated petroleum gas with using of existing field infrastructure (In Russ.), Neftyanoe khozyaystvo = Oil Industry, 2014, no. 4,
pp. 74-77.
4. Apasov G.T., Mukhametshin V.G., Apasov T.G., Sakhipov D.M., Justification of water-gas impact technology using wellhead ejectors at the Samotlor field (In Russ.), Nauka i TEK, 2011, no. 7, pp. 47–50.
5. Nurgaliev A.A., Khabibullin L.T., Solution to the problem of utilization of associated gas from producing oil wells (In Russ.), Fundamental’nye i prikladnye voprosy gornykh nauk, 2014, V. 1, no. 1, pp. 249–257.
6. Agrawal G., Verma V., Gupta S. et al., Novel approach for evaluation of simultaneous water and gas injection pilot project in a Western offshore field, India,
SPE-178122, 2015, DOI: http://doi.org/10.2118/178122-MS
7. Abutalipov U.M., Kitabov A.N., Esipov P.K., Ivanov A.V., Analysis of design and technological parameters of gas-water ejector for associated gas utilization (In Russ.), Ekspozitsiya Neft’ Gaz, 2017, no. 4(57), pp. 54–58.
8. Shevchenko A.K., Chizhov S.I., Tarasov A.V., Preliminary results of fine-dispersed water-gas mixture injection into the reservoir at a late stage of Kotovskoye field development (In Russ.), Neftyanoe khozyaystvo = Oil Industry, 2011, no. 10, pp. 100-102.
9. Drozdov A.N., Drozdov N.A., Bunkin N.F., Kozlov V.A., Study of suppression of gas bubbles coalescence in the liquid for use in technologies of oil production and associated gas utilization, SPE-187741, 2017, DOI: http://doi.org/10.2118/187741-MS
10. Drozdov A.N., Gorelkina E.I., Operating parameters of the pump-ejector system under SWAG injection at the Samodurovskoye field (In Russ.), SOCAR Proceedings, 2022, no. S2, pp. 009–018, DOI: http://doi.org/10.5510/OGP2022SI200734
11. Knyazeva N.A., Beregovoy A.N., Khisametdinov M.R. et al., Preparation for the introduction of SWAG at the fields of PJSC “Tatneft” (In Russ.), SOCAR Proceedings, 2022, no. S2, pp. 19–27, DOI: http://doi.org/10.5510/OGP2022SI200737
12. Drozdov A.N., Gorelkina E.I., Kalinnikov V.N., Pasyuta A.A., An integrated approach to improving the efficiency of pumping oil production at high linear and annular pressures (In Russ.), Burenie i neft’, 2023, no. 2, pp. 48–52.
13. Drozdov A.N., Verbitskiy V.S., Shishulin V.A. et al., Study of the influence of foaming surfactants on the operation of a multistage centrifugal pump when pumping water-gas mixtures created by an ejector (In Russ.), SOCAR Proceedings, 2022, no. S2, pp. 037–044, DOI: http://doi.org/10.5510/OGP2022SI200744
14. Trebin G.F., Charygin N.V., Obukhova T.M., Nefti mestorozhdeniy Sovetskogo Soyuza (Oil from the fields of the Soviet Union), Moscow: Nedra Publ., 1980, 583 p.
15. Kaptelinin N.D., Malyshev A.G., Malysheva G.N., Phase relationships of gas-water hydrate mixtures when pumping them into injection wells (In Russ.), Neftyanoe khozyaystvo = Oil Industry, 1978, no. 5, pp. 44–47.
16. Stanevich V.D., Evaluation of the possibility of hydrate formation in the injected water-gas mixture at the field of the Republic of Tatarstan (In Russ.), Nauchnyy aspekt, 2023, V. 26, no. 5, pp. 3333–3338.
17. Makogon Yu.F., Gidraty prirodnykh gazov (Natural gas hydrates), Moscow: Nedra Publ., 1974, 208 p.
18. Troynikova A.A., Istomin V.A., Semenov A.P. et al., Outlooks for application of electrolytes as inhibitors of hydrating (In Russ.), Vesti gazovoy nauki, 2022, no. 3 (52), pp. 90–100.
