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Study of heavy oil production ceasing options using laboratory research and mathematical modeling

UDK: 622.337.2
DOI: 10.24887/0028-2448-2019-7-32-35
Key words: extra-heavy oil, reservoir flow modeling, steam-assisted gravity drainage (SAGD) method, late stage of development, hot water injection
Authors: A.T. Zaripov (TatNIPIneft, RF, Bugulma), D.K. Shaikhutdinov (TatNIPIneft, RF, Bugulma), Ya.V. Zakharov (TatNIPIneft, RF, Bugulma), A.A. Bisenova (TatNIPIneft, RF, Bugulma), M.M. Remeev (TatNIPIneft, RF, Bugulma), I.A. Islamov (TatNIPIneft, RF, Bugulma)

Many of the currently producing extra-heavy oil fields have entered the closing stage of development, so the correct ceasing of production is a matter of acute importance. This is particularly true for shallow heavy oil reservoirs developed by steam-assisted gravity drainage (SAGD) method involving continuous injection of large volumes of steam into a subsurface formation. The problem is that once the steam injection stops, the injected steam cools and condenses decreasing dramatically in volume and bringing about a sharp decrease of formation pressure. Considering that most of heavy oil reservoirs occur at shallow depths this may be detrimental to environment and can even alter the soil surface.

Various options to cease heavy oil production by example of a heavy oil reservoir in the Sheshminskian formation in Tatarstan developed by the SAGD method were analyzed. The laboratory experiment was modeled on a digital core, and a digital core twin was created to be used in the live reservoir model. Different production ceasing options were considered. A base case provided for steam injection till complete depletion of the reservoir, i.e. development going on in the normal course. Also, options providing for stop of steam injection in different years since start of development were considered and key performance parameters (steam-oil ratio (SOR), cumulative oil production, steam injection) were analyzed.

The paper presents recommendations on criteria for application of production ceasing strategies (stop of steam injection) to cut down steam generation costs, decrease SOR, and minimize oil losses.

References

1. Zaripov A.T., Beregovoy A.N., Shaykhutdinov D.K., Khafizov R.I., Zakharov Ya.V., Bisenova A.A., Improving the efficiency of steam-assisted heavy oil production using gel-forming systems (In Russ.), Tekhnologii nefti i gaza, 2018, no. 1, pp. 35–38.

2. Bisenova A.A., Shaykhutdinov D.K., Otsenka effektivnosti kompleksnoy tekhnologii primeneniya parogravitatsionnogo drenirovaniya i zakachki goryachey vody na zalezhakh sverkhvyazkoy nefti (Assessment of the effectiveness of the integrated technology for the use of steam and gravity drainage and hot water injection in super-viscous oil deposits), Proceedings of Youth Scientific and Practical Conference of TatNIPIneft, Bugul'ma: Publ. of TatNIPIneft', 2018, URL: http://tatnipi.ru/upload/sms/2018/geol/005.pdf.

3. Zaripov A.T., Shaykhutdinov D.K., Analiz posledstviy i riskov ostanovki zakachki para na pozdney stadii razrabotki zalezhey sverkhvyazkoy nefti (Analysis of the consequences and risks of stopping steam injection at a late stage of development of extra-viscous oil deposits), Proceedings of TatNIPIneft' / PAO “Tatneft'”, 2018, V. 86, pp. 85–89.

4. Zaripov A.T., Shaykhutdinov D.K., Analysis of SAGD-wells shutdown effects (In Russ.), Neftyanoe khozyaystvo = Oil Industry, 2016, no. 7, pp. 36–39.

5. Patent no. 2611789. MPK E 21 B 43/24, S 09 K 8/592, Method of development of field of high viscous and ultra high viscous oil by thermal methods at late stage of development, Inventors: Zaripov A.T., Amerkhanov M.I., Shesternin V.V.

Many of the currently producing extra-heavy oil fields have entered the closing stage of development, so the correct ceasing of production is a matter of acute importance. This is particularly true for shallow heavy oil reservoirs developed by steam-assisted gravity drainage (SAGD) method involving continuous injection of large volumes of steam into a subsurface formation. The problem is that once the steam injection stops, the injected steam cools and condenses decreasing dramatically in volume and bringing about a sharp decrease of formation pressure. Considering that most of heavy oil reservoirs occur at shallow depths this may be detrimental to environment and can even alter the soil surface.

Various options to cease heavy oil production by example of a heavy oil reservoir in the Sheshminskian formation in Tatarstan developed by the SAGD method were analyzed. The laboratory experiment was modeled on a digital core, and a digital core twin was created to be used in the live reservoir model. Different production ceasing options were considered. A base case provided for steam injection till complete depletion of the reservoir, i.e. development going on in the normal course. Also, options providing for stop of steam injection in different years since start of development were considered and key performance parameters (steam-oil ratio (SOR), cumulative oil production, steam injection) were analyzed.

The paper presents recommendations on criteria for application of production ceasing strategies (stop of steam injection) to cut down steam generation costs, decrease SOR, and minimize oil losses.

References

1. Zaripov A.T., Beregovoy A.N., Shaykhutdinov D.K., Khafizov R.I., Zakharov Ya.V., Bisenova A.A., Improving the efficiency of steam-assisted heavy oil production using gel-forming systems (In Russ.), Tekhnologii nefti i gaza, 2018, no. 1, pp. 35–38.

2. Bisenova A.A., Shaykhutdinov D.K., Otsenka effektivnosti kompleksnoy tekhnologii primeneniya parogravitatsionnogo drenirovaniya i zakachki goryachey vody na zalezhakh sverkhvyazkoy nefti (Assessment of the effectiveness of the integrated technology for the use of steam and gravity drainage and hot water injection in super-viscous oil deposits), Proceedings of Youth Scientific and Practical Conference of TatNIPIneft, Bugul'ma: Publ. of TatNIPIneft', 2018, URL: http://tatnipi.ru/upload/sms/2018/geol/005.pdf.

3. Zaripov A.T., Shaykhutdinov D.K., Analiz posledstviy i riskov ostanovki zakachki para na pozdney stadii razrabotki zalezhey sverkhvyazkoy nefti (Analysis of the consequences and risks of stopping steam injection at a late stage of development of extra-viscous oil deposits), Proceedings of TatNIPIneft' / PAO “Tatneft'”, 2018, V. 86, pp. 85–89.

4. Zaripov A.T., Shaykhutdinov D.K., Analysis of SAGD-wells shutdown effects (In Russ.), Neftyanoe khozyaystvo = Oil Industry, 2016, no. 7, pp. 36–39.

5. Patent no. 2611789. MPK E 21 B 43/24, S 09 K 8/592, Method of development of field of high viscous and ultra high viscous oil by thermal methods at late stage of development, Inventors: Zaripov A.T., Amerkhanov M.I., Shesternin V.V.


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