Treatment of produced water for steam generation in Tatneft PJSC heavy oil fields

UDK: 628.16.067.1
DOI: 10.24887/0028-2448-2021-7-53-55
Key words: heavy oil, ultrafiltration, reverse osmosis, produced water, oil concentration, treatment of effluents, feed water for steam generation
Authors: F.R. Gubaidulin (TatNIPIneft, RF, Bugulma), L.V. Kudryashova (TatNIPIneft, RF, Bugulma), N.N. Gafarov (TatNIPIneft, RF, Bugulma), A.S. Nurutdinov (TatNIPIneft, RF, Bugulma), R.S Magsumova (TatNIPIneft, RF, Bugulma)

Steam injection has become a common method of extracting heavy crude oil. To mitigate environmental impact associated with disposal of large volumes of produced water in the heavy oil fields and to decrease the need in fresh water from surface sources, the Company has been using the produced water for steam generation. Currently, Tatneft PJSC operates two water treatment units, the Kamenka unit with the capacity 350 m3/h and the Karmalka unit with the capacity 700 m3/h to produce demineralized water to be used as feed water for steam generation. Membrane methods of water treatment and demineralization have been realized in the above-mentioned water treatment units. The flow scheme includes the following process units and operations: sorption-filtration unit (preliminary cleaning to remove residual oil); ultrafiltration membrane unit (removal of oil); activated carbon sorption filters (further removal of dissolved oil and organic matter); reverse osmosis membranes – two stages (demineralization of water); anionic filters (removal of hydrosulfides); hydrogen peroxide dosing unit (complete removal of sulfide ions). TatNIPIneft R&D Institute has performed extensive studies to develop an efficient technology of preliminary cleaning of produced water in the sorption-filtration unit; also, TatNIPIneft research engineers have carried out studies on hydrogen peroxide dosing into demineralized water to neutralize residual sulfide ions, and have designed an automatic hydrogen peroxide dosing unit. The performed pilot tests allowed to select the most efficient agents for chemical washing of the reverse osmosis membranes. Successful operation of the first-in-Russia water treatment units based on the membrane methods has demonstrated that water meets the requirement to feed water for water-tube units for steam generation.

References

1. Buslaev E.S., Kudryashova L.V., Magsumova R.S., Ratsional'noe ispol'zovanie vodnykh resursov pri razrabotke mestorozhdeniy sverkhvyazkoy nefti (Rational use of water resources in the development of super-viscous oil deposits), Proceedings of Scientific and Technical Conference dedicated to the 60th anniversary of TatNIPIneft, 13-14 April 2016, Naberezhnye Chelny: Publ. of Ekspozitsiya Neft’ Gaz, 2016, pp. 438–439.

2. Heins W.F., McNeill R., Vertical-tube evaporator system provides SAGD-quality feed water, World Oil, 2007, V. 228, no. 10, pp. 135–144.

3. Heins W.F., Technical advancements in SAGD evaporative produced water treatment, Journal of Canadian Petroleum Technology, 2009, V. 48, no. 11, pp. 27–32.

4. Minnich K., Neu D., Evaporator choice critical for effective steam production in SAGD operations, Oil & Gas Product News, 2008, V. 12, no. 3, pp. 22–23.

5. Buslaev E.S., Loyko A.V., Itskov S.V., Sakhabutdinov R.Z., Abramov M.A., Issledovanie svoystv poputno dobyvaemoy vody na mestorozhdeniyakh sverkhvyazkoy nefti i razrabotka tekhnologii ee podgotovki dlya povtornogo ispol'zovaniya (Investigation of the properties of associated water in super-viscous oil fields and development of technology for its preparation for reuse), Proceedings of TatNIPIneft' / PAO “Tatneft'”, 2016, V. 84, pp. 247–254.

6. Voikina G.R., Stratilatova I.V., Magsumova R.S., Nurutdinov A.S., Khabibullin I.Ya., Osobennosti fiziko-khimicheskikh svoistv poputno dobyvaemykh vod mestorozhdeniy sverkhvyazkoi nefti PAO Tatneft (Characteristics of physicochemical properties of associated water in heavy oil fields of PJSC TATNEFT), Proceedings of TatNIPIneft' / PAO “Tatneft'”, 2017, V. 85, pp. 392–395.

7. Garifullin R.M., Anufriev A.A., Sakhabutdinov R.Z., Shatalov A.N., Antonova N.V., Akhmadullin R.R., Issledovaniya metodov ochistki poputno dobyvaemoi vody Ashalchinskogo mestorozhdeniya ot serovodoroda (Research into methods for hydrogen sulfide removal from produced water in the Ashalchinskoye field), Proceedings of TatNIPIneft' / PAO “Tatneft'”, 2011, V. 79, pp. 295–302.

8. Patent RU 2 704 664 C1, System for arrangement of heavy oil and natural bitumen deposit, Inventors: Kudryashova L.V., Gubaydulin F.R., Sakhabutdinov R.Z., Nurutdinov A.S., Arsent'ev A.A., Buslaev E.S.

9. Patent RU 2 720 719 C1, System for arrangement of heavy oil and natural bitumen deposit, Inventors: Gubaydulin F.R., Kudryashova L.V., Antonov O.Yu., Nurutdinov A.S., Arsent'ev A.A.

Steam injection has become a common method of extracting heavy crude oil. To mitigate environmental impact associated with disposal of large volumes of produced water in the heavy oil fields and to decrease the need in fresh water from surface sources, the Company has been using the produced water for steam generation. Currently, Tatneft PJSC operates two water treatment units, the Kamenka unit with the capacity 350 m3/h and the Karmalka unit with the capacity 700 m3/h to produce demineralized water to be used as feed water for steam generation. Membrane methods of water treatment and demineralization have been realized in the above-mentioned water treatment units. The flow scheme includes the following process units and operations: sorption-filtration unit (preliminary cleaning to remove residual oil); ultrafiltration membrane unit (removal of oil); activated carbon sorption filters (further removal of dissolved oil and organic matter); reverse osmosis membranes – two stages (demineralization of water); anionic filters (removal of hydrosulfides); hydrogen peroxide dosing unit (complete removal of sulfide ions). TatNIPIneft R&D Institute has performed extensive studies to develop an efficient technology of preliminary cleaning of produced water in the sorption-filtration unit; also, TatNIPIneft research engineers have carried out studies on hydrogen peroxide dosing into demineralized water to neutralize residual sulfide ions, and have designed an automatic hydrogen peroxide dosing unit. The performed pilot tests allowed to select the most efficient agents for chemical washing of the reverse osmosis membranes. Successful operation of the first-in-Russia water treatment units based on the membrane methods has demonstrated that water meets the requirement to feed water for water-tube units for steam generation.

References

1. Buslaev E.S., Kudryashova L.V., Magsumova R.S., Ratsional'noe ispol'zovanie vodnykh resursov pri razrabotke mestorozhdeniy sverkhvyazkoy nefti (Rational use of water resources in the development of super-viscous oil deposits), Proceedings of Scientific and Technical Conference dedicated to the 60th anniversary of TatNIPIneft, 13-14 April 2016, Naberezhnye Chelny: Publ. of Ekspozitsiya Neft’ Gaz, 2016, pp. 438–439.

2. Heins W.F., McNeill R., Vertical-tube evaporator system provides SAGD-quality feed water, World Oil, 2007, V. 228, no. 10, pp. 135–144.

3. Heins W.F., Technical advancements in SAGD evaporative produced water treatment, Journal of Canadian Petroleum Technology, 2009, V. 48, no. 11, pp. 27–32.

4. Minnich K., Neu D., Evaporator choice critical for effective steam production in SAGD operations, Oil & Gas Product News, 2008, V. 12, no. 3, pp. 22–23.

5. Buslaev E.S., Loyko A.V., Itskov S.V., Sakhabutdinov R.Z., Abramov M.A., Issledovanie svoystv poputno dobyvaemoy vody na mestorozhdeniyakh sverkhvyazkoy nefti i razrabotka tekhnologii ee podgotovki dlya povtornogo ispol'zovaniya (Investigation of the properties of associated water in super-viscous oil fields and development of technology for its preparation for reuse), Proceedings of TatNIPIneft' / PAO “Tatneft'”, 2016, V. 84, pp. 247–254.

6. Voikina G.R., Stratilatova I.V., Magsumova R.S., Nurutdinov A.S., Khabibullin I.Ya., Osobennosti fiziko-khimicheskikh svoistv poputno dobyvaemykh vod mestorozhdeniy sverkhvyazkoi nefti PAO Tatneft (Characteristics of physicochemical properties of associated water in heavy oil fields of PJSC TATNEFT), Proceedings of TatNIPIneft' / PAO “Tatneft'”, 2017, V. 85, pp. 392–395.

7. Garifullin R.M., Anufriev A.A., Sakhabutdinov R.Z., Shatalov A.N., Antonova N.V., Akhmadullin R.R., Issledovaniya metodov ochistki poputno dobyvaemoi vody Ashalchinskogo mestorozhdeniya ot serovodoroda (Research into methods for hydrogen sulfide removal from produced water in the Ashalchinskoye field), Proceedings of TatNIPIneft' / PAO “Tatneft'”, 2011, V. 79, pp. 295–302.

8. Patent RU 2 704 664 C1, System for arrangement of heavy oil and natural bitumen deposit, Inventors: Kudryashova L.V., Gubaydulin F.R., Sakhabutdinov R.Z., Nurutdinov A.S., Arsent'ev A.A., Buslaev E.S.

9. Patent RU 2 720 719 C1, System for arrangement of heavy oil and natural bitumen deposit, Inventors: Gubaydulin F.R., Kudryashova L.V., Antonov O.Yu., Nurutdinov A.S., Arsent'ev A.A.


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