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Pilot tests of diverter technology at Kharyaginskoye field

UDK: 622.276.6
DOI: 10.24887/0028-2448-2018-9-52-57
Key words: enhanced oil recovery (EOR), Kharyaginskoye field, diverter technology, pilot tests, carbonate reservoir, karst, fractured reservoir
Authors: Yu.M. Trushin (Zarubezneft - Production Kharyaga LLC, RF, Moscow), A.S. Aleshchenko (Zarubezneft - Production Kharyaga LLC, RF, Moscow), K.A. Danilin (Zarubezneft - Production Kharyaga LLC, RF, Moscow), M.S. Arsamakov (Zarubezneft - Production Kharyaga LLC, RF, Moscow), V.L. Terentyev (VNIIneft JSC, RF, Moscow), A.G. Kolyagin (VNIIneft JSC, RF, Moscow), P.K. Fedorov (VNIIneft JSC, RF, Moscow), R.A. Rizvanov (VNIIneft JSC, RF, Moscow), I.V. Shuverov (VNIIneft JSC, RF, Moscow)

Paper presents the case study of diverter injection at Kharyaginskoye field. Main development target is Devonian carbonate reservoir. In horizontal plane, the reservoir is divided into two zones: barrier reef and lagoon area. Zones differ by permeability distribution and fluids flow behavior. Core analysis is shown the presents of second porosity system, however, the hydrodynamic survey doesn’t indicate double porosity system in the reservoir. The reservoir is saturated by the light oil (1.15 mPaв‹…s). Formation water salinity is relatively high (170000 ppm). The waterflood process is implementing. The production watercut is about 60%. Reservoir temperature is 61 °C, it makes possible to inject a variety of diverters. As screening result cross-linked acrylamide polymer with addition of chromium acetate (cross-linking agent) was selected as the most efficient injection agent (diverter). Injection was performed in 5 injector wells; the production rates of 16 producers were monitored. The incremental recovery after 7 months after diverter injection is about 20000 tons and still increasing.

References

1. Abdalla R., Gomes J., Al Kobaisi M., Mahmoud G., Assesment of the areal and vertical sweep efficiency in cyclic carbonate reservoirs of the Middle East, SPE 184008-MS, 2017.

2. Al-Hattali R., Al-Sulaimanu H., Al-Wahaibi Y., Al-Bahry S. et al., Improving sweep efficiency in fractured carbonate reservoirs by microbial biomass, SPE 154679-MS, 2012.

3. Lalehrokh F., Bryant S.L., Huh Ch., Application of pH-triggered polymers in fractured reservoirs to increase sweep efficiency, SPE 113800, 2008.

4. Zakharov V.P., Ismagilov T.A., Antonov A.M. et al., Waterproofing of cracks from the side of injection wells in carbonate reservoirs (In Russ.), Neftyanoe khozyaystvo = Oil Industry, 2010, no. 12, pp. 102–105.

5. https://корона-тэк.рф/katalog/povyishenie-nefteotdachi-plastov/ustanovki-kudr/kudr-1

6. Zhdanov S.A., Gorubnov A.T. et al., Metodicheskoe rukovodstvo po otsenke tekhnologicheskoy effektivnosti primeneniya metodov uvelicheniya nefteotdachi (Methodological guidance on the assessment of technological effectiveness of enhanced oil recovery methods), Moscow: Publ. of RMNTK Nefteotdacha, 1996, 87 p.

7. Metodika otsenki tekhnologicheskoy effektivnosti metodov povysheniya nefteotdachi plastov (Technique for assessing the technological effectiveness of enhanced oil recovery methods), Moscow: Publ. of Ministry of Energy of Russia, 2003.

Paper presents the case study of diverter injection at Kharyaginskoye field. Main development target is Devonian carbonate reservoir. In horizontal plane, the reservoir is divided into two zones: barrier reef and lagoon area. Zones differ by permeability distribution and fluids flow behavior. Core analysis is shown the presents of second porosity system, however, the hydrodynamic survey doesn’t indicate double porosity system in the reservoir. The reservoir is saturated by the light oil (1.15 mPaв‹…s). Formation water salinity is relatively high (170000 ppm). The waterflood process is implementing. The production watercut is about 60%. Reservoir temperature is 61 °C, it makes possible to inject a variety of diverters. As screening result cross-linked acrylamide polymer with addition of chromium acetate (cross-linking agent) was selected as the most efficient injection agent (diverter). Injection was performed in 5 injector wells; the production rates of 16 producers were monitored. The incremental recovery after 7 months after diverter injection is about 20000 tons and still increasing.

References

1. Abdalla R., Gomes J., Al Kobaisi M., Mahmoud G., Assesment of the areal and vertical sweep efficiency in cyclic carbonate reservoirs of the Middle East, SPE 184008-MS, 2017.

2. Al-Hattali R., Al-Sulaimanu H., Al-Wahaibi Y., Al-Bahry S. et al., Improving sweep efficiency in fractured carbonate reservoirs by microbial biomass, SPE 154679-MS, 2012.

3. Lalehrokh F., Bryant S.L., Huh Ch., Application of pH-triggered polymers in fractured reservoirs to increase sweep efficiency, SPE 113800, 2008.

4. Zakharov V.P., Ismagilov T.A., Antonov A.M. et al., Waterproofing of cracks from the side of injection wells in carbonate reservoirs (In Russ.), Neftyanoe khozyaystvo = Oil Industry, 2010, no. 12, pp. 102–105.

5. https://корона-тэк.рф/katalog/povyishenie-nefteotdachi-plastov/ustanovki-kudr/kudr-1

6. Zhdanov S.A., Gorubnov A.T. et al., Metodicheskoe rukovodstvo po otsenke tekhnologicheskoy effektivnosti primeneniya metodov uvelicheniya nefteotdachi (Methodological guidance on the assessment of technological effectiveness of enhanced oil recovery methods), Moscow: Publ. of RMNTK Nefteotdacha, 1996, 87 p.

7. Metodika otsenki tekhnologicheskoy effektivnosti metodov povysheniya nefteotdachi plastov (Technique for assessing the technological effectiveness of enhanced oil recovery methods), Moscow: Publ. of Ministry of Energy of Russia, 2003.



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