Process engineering solutions to improve heavy oil development at Tatneft assets

UDK: 622.337.2
DOI: 10.24887/0028-2448-2020-1-60-65
Key words: steam-assisted gravity drainage (SAGD), heavy oil reservoirs, transition zone, hydrocarbon solvents, acid compositions, thermo-gelling compositions
Authors: M.I. Amerkhanov (Tatnet PJSC, RF, Almetyevsk), A.T. Zaripov (TatNIPIneft, RF, Bugulma), A.N. Beregovoi (TatNIPIneft, RF, Bugulma), N.A. Knyazeva (TatNIPIneft, RF, Bugulma), E.P. Vasilyev (TatNIPIneft, RF, Bugulma)

Currently, pilot project on heavy oil production by SAGD technology is being implemented in Tatarstan fields. An essential factor complicating heavy oil production is presence of oil-water transition zones penetrated by production wells. Other adverse factors include presence of gas and water zones, lack of distinct reservoir continuity, mudded interlayers, high variability of OWC depth over short intervals in new fields and uplifts. All these factors result in either man-induced or natural migration of underlying mineral waters into the overlying fresh water aquifers. At the same time, a number of issues should be addressed prior to production operations, including selection of optimal composition based on rock mineralogy in the interwell space, and calculation of the required injected amount and concentration of chemicals, which will depend on reservoir rocks (clay and carbonate content). On the one hand, the amount of the injected composition should be sufficient for efficient treatment of the interwell space; on the other hand, it is necessary to prevent channeling between parallel horizontal wells (injector and producer), which will eventually result in steam breakthrough. It is critical to solve the problem of minimizing the adverse impact on the tubing string and the screen pipe by selecting an optimal composition and stimulation option. Some engineering aspects must also be addressed concerning treating either the entire horizontal wellbore or the selected borehole sections. This will require application of emulsion compositions.

To date, due to concerted efforts of engineers from scientific and production units of Tatneft PJSC, a suite of technology has been developed to significantly mitigate the negative effect of the above-mentioned factors when producing heavy oil by SAGD method.

References

1. Takhautdinov Sh., Ibragimov N., Khisamov R. et al., Modern SAGD technology - From modeling to field monitoring, Proceedings of World Heavy Oil Congress, 5-7 March 2014, New Orleans, Louisiana, USA, 257 p.

2. Shaykhutdinov D.K., Zaripov A.T., Khafizov R.I., Beregovoy A.N., Povyshenie effektivnosti razrabotki zalezhey SVN s primeneniem geleobrazuyushchikh kompozitsiy na gorizontal'nykh skvazhinakh (Increasing the efficiency of the development of high viscous oil deposits using gel-forming compositions on horizontal wells), Collected papers “Gorizontal'nye skvazhiny i GRP v povyshenii effektivnosti razrabotki neftyanykh mestorozhdeniy” (Horizontal wells and fracturing in increasing the efficiency of development of oil fields), Proceedings of International Scientific and Practical Conference devoted to the founder of horizontal drilling – Grigoryan A.M., Kazan', 6-7 September 2017, Kazan': Slovo Publ., 2017, pp. 280–282.

3. Patent no. 2483092 RF, MPK C 09 K 8/42, Composition of polysaccharide gel for killing of high-temperature wells, Inventors: Ibatullin R.R., Amerkhanov M.I., Rakhimova Sh.G., Beregovoy A.N., Zolotukhina V.S., Ibragimov N.G., Fadeev V.G.

4. Patent no. 2522369 RF, MPK E 21 B 43/24, Method for development of high-viscosity oil and/or bitumen deposits with oil-water zones, Inventors: Amerkhanov M.I., Shesternin V.V., Beregovoy A.N., Vasil'ev E.P.

5. Amerkhanov M.I., Zaripov A.T., Beregovoy Ant.N. et al., Innovative solution for enhanced of oil recovery at shallow deposits of heavy oil (In Russ.), Neftyanoe khozyaystvo = Oil Industry, 2018, no. 7, pp. 24–27.

6. Beregovoy Ant.N., Knyazeva N.A., Vasil'ev E.P. et al., Povyshenie effektivnosti razrabotki zalezhey sverkhvyazkoy nefti s uplotnennymi i zaglinizirovannymi kollektorami (Improving the efficiency of the development of extra-viscous oil deposits with seal and mudded-off collectors), Proceedings of TatNIPIneft' / Tatneft PJSC, Moscow: Neftyanoe khozyaystvo Publ., 2019, V. 87, pp. 137–144.

7. Ibatullin R.R., Tekhnologicheskie protsessy razrabotki neftyanykh mestorozhdeniy (Technological processes of development of oil deposits), Moscow: Publ. of VNIIOENG, 2011, 304 p.

8. McLeod H.O., Coulter A.W., The use of alcohol in gas well stimulation, SPE-1663-MS, 1966, https://doi.org/10.2118/1663-MS.

9. Patent no. 2686768 RF, MPK E21B 43/27, E21B 43/24, E21B 7/04, E21B 49/00, C09K 8/72, Method for development of super-viscous oil and/or bitumen deposit in compacted and clogged reservoirs (versions), Inventors: Amerkhanov M.I., Beregovoy A.N., Vasil'ev E.P., Knyazeva N.A., Razumov A.R.

10. Amerkhanov M.I., Beregovoy Ant.N., Vasil'ev E.P. et al., Primenenie rastvoriteley dlya povysheniya effektivnosti razrabotki zalezhey sverkhvyazkoy nefti s ispol'zovaniem parogravitatsionnogo drenirovaniya (The use of solvents to increase the efficiency of the development of deposits of super-viscous oil using steam and gravity drainage), Proceedings of TatNIPIneft' / PAO “Tatneft'”, 2018, V. 86, pp. 105–111.

11. Beregovoy Ant.N., Knyazeva N.A., Rakhimova Sh.G. et al., Fizicheskoe modelirovanie razlichnykh variantov zakachki rastvoritelya dlya povysheniya dobychi sverkhvyazkoy nefti (Physical modeling of various solvent injection options to increase the production of super-viscous oil), Proceedings of TatNIPIneft' / PAO “Tatneft'”, 2018, V. 86, pp. 179–183.

12. Akhmetzyanov F.M., Zaripov A.T., Beregovoy Ant.N. et al., Povyshenie effektivnosti razrabotki zalezhey sverkhvyazkoy nefti s primeneniem metoda parogravitatsionnogo drenirovaniya za schet vnedreniya usovershenstvovannoy tekhnologii zakachki uglevodorodnogo rastvoritelya (Improving the efficiency of the development of super-viscous oil deposits using the method of steam gravity drainage due to the introduction of an improved technology for the injection of hydrocarbon solvent), Proceedings of TatNIPIneft' / Tatneft PJSC, Moscow: Neftyanoe khozyaystvo Publ., 2019, V. 87, pp. 153–157.

Currently, pilot project on heavy oil production by SAGD technology is being implemented in Tatarstan fields. An essential factor complicating heavy oil production is presence of oil-water transition zones penetrated by production wells. Other adverse factors include presence of gas and water zones, lack of distinct reservoir continuity, mudded interlayers, high variability of OWC depth over short intervals in new fields and uplifts. All these factors result in either man-induced or natural migration of underlying mineral waters into the overlying fresh water aquifers. At the same time, a number of issues should be addressed prior to production operations, including selection of optimal composition based on rock mineralogy in the interwell space, and calculation of the required injected amount and concentration of chemicals, which will depend on reservoir rocks (clay and carbonate content). On the one hand, the amount of the injected composition should be sufficient for efficient treatment of the interwell space; on the other hand, it is necessary to prevent channeling between parallel horizontal wells (injector and producer), which will eventually result in steam breakthrough. It is critical to solve the problem of minimizing the adverse impact on the tubing string and the screen pipe by selecting an optimal composition and stimulation option. Some engineering aspects must also be addressed concerning treating either the entire horizontal wellbore or the selected borehole sections. This will require application of emulsion compositions.

To date, due to concerted efforts of engineers from scientific and production units of Tatneft PJSC, a suite of technology has been developed to significantly mitigate the negative effect of the above-mentioned factors when producing heavy oil by SAGD method.

References

1. Takhautdinov Sh., Ibragimov N., Khisamov R. et al., Modern SAGD technology - From modeling to field monitoring, Proceedings of World Heavy Oil Congress, 5-7 March 2014, New Orleans, Louisiana, USA, 257 p.

2. Shaykhutdinov D.K., Zaripov A.T., Khafizov R.I., Beregovoy A.N., Povyshenie effektivnosti razrabotki zalezhey SVN s primeneniem geleobrazuyushchikh kompozitsiy na gorizontal'nykh skvazhinakh (Increasing the efficiency of the development of high viscous oil deposits using gel-forming compositions on horizontal wells), Collected papers “Gorizontal'nye skvazhiny i GRP v povyshenii effektivnosti razrabotki neftyanykh mestorozhdeniy” (Horizontal wells and fracturing in increasing the efficiency of development of oil fields), Proceedings of International Scientific and Practical Conference devoted to the founder of horizontal drilling – Grigoryan A.M., Kazan', 6-7 September 2017, Kazan': Slovo Publ., 2017, pp. 280–282.

3. Patent no. 2483092 RF, MPK C 09 K 8/42, Composition of polysaccharide gel for killing of high-temperature wells, Inventors: Ibatullin R.R., Amerkhanov M.I., Rakhimova Sh.G., Beregovoy A.N., Zolotukhina V.S., Ibragimov N.G., Fadeev V.G.

4. Patent no. 2522369 RF, MPK E 21 B 43/24, Method for development of high-viscosity oil and/or bitumen deposits with oil-water zones, Inventors: Amerkhanov M.I., Shesternin V.V., Beregovoy A.N., Vasil'ev E.P.

5. Amerkhanov M.I., Zaripov A.T., Beregovoy Ant.N. et al., Innovative solution for enhanced of oil recovery at shallow deposits of heavy oil (In Russ.), Neftyanoe khozyaystvo = Oil Industry, 2018, no. 7, pp. 24–27.

6. Beregovoy Ant.N., Knyazeva N.A., Vasil'ev E.P. et al., Povyshenie effektivnosti razrabotki zalezhey sverkhvyazkoy nefti s uplotnennymi i zaglinizirovannymi kollektorami (Improving the efficiency of the development of extra-viscous oil deposits with seal and mudded-off collectors), Proceedings of TatNIPIneft' / Tatneft PJSC, Moscow: Neftyanoe khozyaystvo Publ., 2019, V. 87, pp. 137–144.

7. Ibatullin R.R., Tekhnologicheskie protsessy razrabotki neftyanykh mestorozhdeniy (Technological processes of development of oil deposits), Moscow: Publ. of VNIIOENG, 2011, 304 p.

8. McLeod H.O., Coulter A.W., The use of alcohol in gas well stimulation, SPE-1663-MS, 1966, https://doi.org/10.2118/1663-MS.

9. Patent no. 2686768 RF, MPK E21B 43/27, E21B 43/24, E21B 7/04, E21B 49/00, C09K 8/72, Method for development of super-viscous oil and/or bitumen deposit in compacted and clogged reservoirs (versions), Inventors: Amerkhanov M.I., Beregovoy A.N., Vasil'ev E.P., Knyazeva N.A., Razumov A.R.

10. Amerkhanov M.I., Beregovoy Ant.N., Vasil'ev E.P. et al., Primenenie rastvoriteley dlya povysheniya effektivnosti razrabotki zalezhey sverkhvyazkoy nefti s ispol'zovaniem parogravitatsionnogo drenirovaniya (The use of solvents to increase the efficiency of the development of deposits of super-viscous oil using steam and gravity drainage), Proceedings of TatNIPIneft' / PAO “Tatneft'”, 2018, V. 86, pp. 105–111.

11. Beregovoy Ant.N., Knyazeva N.A., Rakhimova Sh.G. et al., Fizicheskoe modelirovanie razlichnykh variantov zakachki rastvoritelya dlya povysheniya dobychi sverkhvyazkoy nefti (Physical modeling of various solvent injection options to increase the production of super-viscous oil), Proceedings of TatNIPIneft' / PAO “Tatneft'”, 2018, V. 86, pp. 179–183.

12. Akhmetzyanov F.M., Zaripov A.T., Beregovoy Ant.N. et al., Povyshenie effektivnosti razrabotki zalezhey sverkhvyazkoy nefti s primeneniem metoda parogravitatsionnogo drenirovaniya za schet vnedreniya usovershenstvovannoy tekhnologii zakachki uglevodorodnogo rastvoritelya (Improving the efficiency of the development of super-viscous oil deposits using the method of steam gravity drainage due to the introduction of an improved technology for the injection of hydrocarbon solvent), Proceedings of TatNIPIneft' / Tatneft PJSC, Moscow: Neftyanoe khozyaystvo Publ., 2019, V. 87, pp. 153–157.


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