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Investigation of increasing of the injection wells injectivity with self-diverting acid compositions in a layered heterogeneous carbonate reservoir

UDK: 622.276.432:622.245.544
DOI: 10.24887/0028-2448-2020-11-98-102
Key words: bottomhole formation zone, bottomhole treatment, acid treatments, self-diverting acid systems, injection well
Authors: K.V. Andreev (Perm National Research Polytechnic University, RF, Perm; VolgogradNIPImorneft Branch of LUKOIL-Engineering LLC in Volgograd, RF, Volgograd)

Recently, a huge part of the remaining recoverable oil reserves is concentrated in layered-heterogeneous carbonate reservoirs. For carbonate, dissected reservoirs, the problem of increasing the oil recovery coefficient by organizing a system for maintaining reservoir pressure is still relevant. Oil fields at the last stage of operation have a number of factors that reduce the effectiveness of impact on the bottom-hole zone of the productive formation. These factors include: high water content of the extracted products, low reservoir pressure, the presence of backwater flows, and the multiplicity of acid treatments. The carbonate reservoir is also complicated by multidirectional fracturing and a lower oil recovery coefficient compared to the terrigenous one in addition to all these factors. The inflow in the carbonate reservoir mainly occurs through cracks, which is why there is often an advanced flooding both due to the advance of the water-oil contact and due to water breakouts from injection wells. In both cases, acid treatments can worsen the situation, since they increase the permeability of watered channels-cracks to a greater extent due to higher filterability. Thus, as a result of repeated acid treatments of reservoirs with significant layer-by-layer heterogeneity and fracturing, the reservoir becomes even more heterogeneous in permeability. In turn, the matrix of the carbonate reservoir containing the main residual reserves under standard acid treatments is exposed to a greater extent superficially, in the best case, cavities are formed. Therefore, one of the important tasks of acidic action on the carbonate reservoir is the most complete involvement of its matrix in the drainage process. When treated with self-deflecting acid, it is possible to form wormholes in the reservoir matrix not only due to inhomogeneities of the rock, but also due to redirection of the impact vector on the rock as a result of increasing the resistance of the formed gel.

The article presents results of analysis of the efficiency of processing the bottom-hole zone of the formation to increase the intake capacity of injection wells in relation to the deposits of the Volgian stage of the Korchagin field.

References

1. Napalkov V.N., Nurgalieva N.G., Plotnikova I.N., Efficiency of application of the hydrochlorid-acid formation treatment in the cavernous-fractured reservoirs of the extra-heavy crude oils and bitumen fields (In Russ.), Georesursy, 2009, no. 3 (31), pp. 44–46.

2. Economides M.J., Nolte K.G., Reservoir stimulation, Wiley, 3rd ed. Wiley, 2002.

3. Akhmerova E.E., Shafikova E.A., Apkarimova G.I. Et al., Selection of effective acid compound for carbonate collector treatment (In Russ.),  Bashkirskiy khimicheskiy zhurnal, 2018, V. 25, no. 3, pp. 86–92.

4. Fedorenko V.Yu., Nig"matullin M.M., Petukhov A.S. et al., Acid composition for the treatment of bottomhole formation zone. Optimizing the content of iron stabilizer, for certain oils of the Volga region (In Russ.), Vestnik Kazanskogo tekhnologicheskogo universiteta, 2011, no. 13, pp. 136–140.

5. Kalfayan L., Production enhancement with acid stimulation, 2nd ed., PennWell corp., 2008.

6. Khisamutdinov N.I., Takhautdinov Sh.F., Telin A.G. et al., Problemy izvlecheniya ostatochnoy nefti fiziko-khimicheskimi metodami (Problems of residual oil recovery by physicochemical methods), Moscow: Publ. of VNIIONG, 2001, 184 p.

7. Tkachev D.V., Pecherskiy G.G., Kuskil'dina Yu.V. et al., Practical experience of controlled acid treatment of carbonate reservoirs using self-deviating acid system (In Russ.), Oborudovanie i tekhnologii dlya neftegazovogo kompleksa, 2016, no. 5, pp. 21–26.

8. Sagan D.P., Treatment of the bottomhole zone of wells using a selective diverter of acid composition – temporary selective bridging agent (In Russ.), Vestnik nauki, 2019, V. 3, no. 6 (15), pp. 425–427.

9. VDA – vyazkouprugaya samootklonyayushchayasya kislota. Dlya polnogo okhvata mnogozonnykh karbonatnykh kollektorov (VDA – Viscoelastic self diverting acid for complete coverage of multi-zone carbonate reservoirs) Schlumberger, 2003, URL: http://www.slb.ru/upload/iblock/22f/vda-brochure-rus.pdf.

10. URL: http://www.synergytechnology.ru/strim-s.php.

11. Expert Technology v ritme innovatsiy nefteservisa. Geliruyushchie agenty DIVA dlya kislotnoy obrabotki plastov (Expert Technology in the rhythm of oilfield service innovations. DIVA gelling agents for acidizing formations), URL: http://www.expert-technology.ru/service/treatments/diva.

12. URL: http://www.polyex.perm.ru/rus/sufrogel.

13. Demakhin S.A., Shipilov A.I., Mokrushin A.A. et al., Effective acid. Variety of acid systems for stimulating production in difficult conditions (In Russ.), Neftegazovaya vertikal', 2017, no. 7–8, pp. 52–53.

Recently, a huge part of the remaining recoverable oil reserves is concentrated in layered-heterogeneous carbonate reservoirs. For carbonate, dissected reservoirs, the problem of increasing the oil recovery coefficient by organizing a system for maintaining reservoir pressure is still relevant. Oil fields at the last stage of operation have a number of factors that reduce the effectiveness of impact on the bottom-hole zone of the productive formation. These factors include: high water content of the extracted products, low reservoir pressure, the presence of backwater flows, and the multiplicity of acid treatments. The carbonate reservoir is also complicated by multidirectional fracturing and a lower oil recovery coefficient compared to the terrigenous one in addition to all these factors. The inflow in the carbonate reservoir mainly occurs through cracks, which is why there is often an advanced flooding both due to the advance of the water-oil contact and due to water breakouts from injection wells. In both cases, acid treatments can worsen the situation, since they increase the permeability of watered channels-cracks to a greater extent due to higher filterability. Thus, as a result of repeated acid treatments of reservoirs with significant layer-by-layer heterogeneity and fracturing, the reservoir becomes even more heterogeneous in permeability. In turn, the matrix of the carbonate reservoir containing the main residual reserves under standard acid treatments is exposed to a greater extent superficially, in the best case, cavities are formed. Therefore, one of the important tasks of acidic action on the carbonate reservoir is the most complete involvement of its matrix in the drainage process. When treated with self-deflecting acid, it is possible to form wormholes in the reservoir matrix not only due to inhomogeneities of the rock, but also due to redirection of the impact vector on the rock as a result of increasing the resistance of the formed gel.

The article presents results of analysis of the efficiency of processing the bottom-hole zone of the formation to increase the intake capacity of injection wells in relation to the deposits of the Volgian stage of the Korchagin field.

References

1. Napalkov V.N., Nurgalieva N.G., Plotnikova I.N., Efficiency of application of the hydrochlorid-acid formation treatment in the cavernous-fractured reservoirs of the extra-heavy crude oils and bitumen fields (In Russ.), Georesursy, 2009, no. 3 (31), pp. 44–46.

2. Economides M.J., Nolte K.G., Reservoir stimulation, Wiley, 3rd ed. Wiley, 2002.

3. Akhmerova E.E., Shafikova E.A., Apkarimova G.I. Et al., Selection of effective acid compound for carbonate collector treatment (In Russ.),  Bashkirskiy khimicheskiy zhurnal, 2018, V. 25, no. 3, pp. 86–92.

4. Fedorenko V.Yu., Nig"matullin M.M., Petukhov A.S. et al., Acid composition for the treatment of bottomhole formation zone. Optimizing the content of iron stabilizer, for certain oils of the Volga region (In Russ.), Vestnik Kazanskogo tekhnologicheskogo universiteta, 2011, no. 13, pp. 136–140.

5. Kalfayan L., Production enhancement with acid stimulation, 2nd ed., PennWell corp., 2008.

6. Khisamutdinov N.I., Takhautdinov Sh.F., Telin A.G. et al., Problemy izvlecheniya ostatochnoy nefti fiziko-khimicheskimi metodami (Problems of residual oil recovery by physicochemical methods), Moscow: Publ. of VNIIONG, 2001, 184 p.

7. Tkachev D.V., Pecherskiy G.G., Kuskil'dina Yu.V. et al., Practical experience of controlled acid treatment of carbonate reservoirs using self-deviating acid system (In Russ.), Oborudovanie i tekhnologii dlya neftegazovogo kompleksa, 2016, no. 5, pp. 21–26.

8. Sagan D.P., Treatment of the bottomhole zone of wells using a selective diverter of acid composition – temporary selective bridging agent (In Russ.), Vestnik nauki, 2019, V. 3, no. 6 (15), pp. 425–427.

9. VDA – vyazkouprugaya samootklonyayushchayasya kislota. Dlya polnogo okhvata mnogozonnykh karbonatnykh kollektorov (VDA – Viscoelastic self diverting acid for complete coverage of multi-zone carbonate reservoirs) Schlumberger, 2003, URL: http://www.slb.ru/upload/iblock/22f/vda-brochure-rus.pdf.

10. URL: http://www.synergytechnology.ru/strim-s.php.

11. Expert Technology v ritme innovatsiy nefteservisa. Geliruyushchie agenty DIVA dlya kislotnoy obrabotki plastov (Expert Technology in the rhythm of oilfield service innovations. DIVA gelling agents for acidizing formations), URL: http://www.expert-technology.ru/service/treatments/diva.

12. URL: http://www.polyex.perm.ru/rus/sufrogel.

13. Demakhin S.A., Shipilov A.I., Mokrushin A.A. et al., Effective acid. Variety of acid systems for stimulating production in difficult conditions (In Russ.), Neftegazovaya vertikal', 2017, no. 7–8, pp. 52–53.



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