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Testing of produced water advanced treatment technologies in heavy oil fields

UDK: 628.16.067.1
DOI: 10.24887/0028-2448-2018-7-42-44
Key words: produced water, filtration, filtration rate, ultrafiltration, oil content, recovery, fluidizing
Authors: A.S. Nurutdinov (TatNIPIneft, RF, Bugulma), L.V. Kudryashova (TatNIPIneft, RF, Bugulma), F.R. Gubaidullin (TatNIPIneft, RF, Bugulma), R.Z. Sakhabutdinov (TatNIPIneft, RF, Bugulma), E.S. Buslaev (NTC Tatneft OOO, RF, Bugulma)

Today, all heavy oil production projects involve produced water recycling and reuse for steam generation. The primary and the most important stage of water treatment up to the boiler feed water standards is removal of the residual oil, which is performed in several steps.

This paper presents the results of field tests of two technologies aimed at residual oil removal from water, namely, filtering through the bulk material based on aluminosilicate rocks and ultrafiltration through tubular ceramic membrane. These tests defined the achievable water quality and the most efficient process parameters. Post-filtration residual oil-in-water content has been maximum 0.3 and 1.0 mg/dm3 for the bulk material and the ceramic membranes, respectively. Steady operation of the filtering materials has been observed during the tests without changes in the filtration rate or differential pressure increase within three days. The filtering material recovery by generating a steady fluidized bed with water back flow results in complete removal of the trapped contaminants. The wash water volume was equal to 1.0-1.5% of the treated water. The initial filtering parameters of the ceramic membrane have been restored by its flushing with alkaline and nitric solutions. The service cycle is inversely related to the transmembrane pressure and varies from 4 to 14 days.


The treated water can be used for process needs; for example, it can be further desalted and softened to produce boiler feed water.В  В В 

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, pp438-439.

2. 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.

3. Patent no. 2503806 RF, MPK E 21 V 43/20, F 17 D 1/16,В  System for heavy oil and natural bitumen deposit arrangement (Versions), Inventors: Sakhabutdinov R.Z., Fadeev V.G., Akhmadullin R.R., Gubaydulin F.R., Sudykin S.N., Kudryashova L.V., Shakirova L.N., Sudykin A.N.В 


Today, all heavy oil production projects involve produced water recycling and reuse for steam generation. The primary and the most important stage of water treatment up to the boiler feed water standards is removal of the residual oil, which is performed in several steps.

This paper presents the results of field tests of two technologies aimed at residual oil removal from water, namely, filtering through the bulk material based on aluminosilicate rocks and ultrafiltration through tubular ceramic membrane. These tests defined the achievable water quality and the most efficient process parameters. Post-filtration residual oil-in-water content has been maximum 0.3 and 1.0 mg/dm3 for the bulk material and the ceramic membranes, respectively. Steady operation of the filtering materials has been observed during the tests without changes in the filtration rate or differential pressure increase within three days. The filtering material recovery by generating a steady fluidized bed with water back flow results in complete removal of the trapped contaminants. The wash water volume was equal to 1.0-1.5% of the treated water. The initial filtering parameters of the ceramic membrane have been restored by its flushing with alkaline and nitric solutions. The service cycle is inversely related to the transmembrane pressure and varies from 4 to 14 days.


The treated water can be used for process needs; for example, it can be further desalted and softened to produce boiler feed water.В  В В 

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, pp438-439.

2. 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.

3. Patent no. 2503806 RF, MPK E 21 V 43/20, F 17 D 1/16,В  System for heavy oil and natural bitumen deposit arrangement (Versions), Inventors: Sakhabutdinov R.Z., Fadeev V.G., Akhmadullin R.R., Gubaydulin F.R., Sudykin S.N., Kudryashova L.V., Shakirova L.N., Sudykin A.N.В 



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