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The laboratory studying self-diverting acid systems for acidic treatments of wells with stratified irregularity in carbonate reservoirs

UDK: 622.276.432:622.245.544
DOI: 10.24887/0028-2448-2020-11-94-97
Key words: bottomhole formation zone, bottomhole treatment, acid treatments, stratified irregularity, self-diverting acid systems, flow-diverters, invert emulsions, viscoelastic surfactants
Authors: A.S. Kazantsev (Perm National Research Polytechnic University, RF, Perm; VolgogradNIPImorneft Branch of LUKOIL-Engineering LLC in Volgograd, RF, Volgograd)

The huge part of remaining recoverable reserves of oil in Perm region is concentrated in complex structured stratified carbonate reservoirs. Thus, the task of improving the efficiency of oil field development and providing good control and adjustability of the field development process in the condition of intermittent  production is complicated with the increase of watercut while the recovery of reserves. That is why the approaches to bottomhole treatment and candidate wells selection are complicated. The importance of accurate fluid placement during acid treatment is increased. The bottomhole treatment often needs flow-diverters for successful acidizing.

The approaches and main results of laboratory testing of self-diverting acid systems and flow-diverters for complex acid treatments in stratified irregular reservoirs are given in the article. There is shown that self-diverting acid systems based on viscoelastic surfactants demonstrate an effect of flow diversion while the low value of permeability contrast. Decreasing of acid content in self-diverting acid system increases the effect of flow diversion due to increasing of viscosity of the acid while spending of acid. Flow-diverters based of invert emulsions have the high initial viscosity that’s why such kind of systems demonstrate the strong effect of flow diversion in case of higher irregularity and permeability contrast. Recommendations of using different flow-diverting systems for objects with different properties of reservoir based on laboratory tests are formulated. Regarded technologies are widely used in Perm region.

References

1. RakhmanovR.M ., Ismagilov F.Z., Fakhrutdinov G.N. et al., Razvitie tekhnologicheskikh aspektov ispol'zovaniya kislotnykh stimuliruyushchikh kompozitsiy «KSK-Tatneft'» i pervye rezul'taty ikh promyshlennogo vnedreniya (Development of technological aspects of the use of acid stimulating compositions "KSK-Tatneft" and the first results of their industrial implementation), Collection of scientific papers TatNIPIneft, Moscow: Neftyanoe khozyaystvo Publ., 2011, pp. 221–231.

2. Efimov O.D., Rakhmatullina Yu.Sh., Valiev M.F. et al., Application the self-diverting acid to increasing the production wells (on example Orenburg OGCF) (In Russ.), Ekspozitsiya Neft' Gaz, 2015, no. 7(46), pp. 48–50.

3. 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.

4. 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.

5. Glushchenko V.N., Obratnye emul'sii i suspenzii v neftegazovoy promyshlennosti (Inverse emulsions and suspensions in the oil and gas industry), Moscow: Interkontakt - Nauka Publ., 2008, 725 p.

6. Orlov G.A., Kendis M.Sh., Glushchenko V.N., Primenenie obratnykh emul’siy v neftedobyche (Application of inverse emulsions in oil production), Moscow: Nedra Publ., 1991, 225 p.

7. Makeev G.A., Sannikov V.A., Study of water-insulating properties of materials for carbonate reservoirs (In Russ.), Neftyanoe khozyaystvo = Oil Industry, 1987, no. 7, pp. 46–49.

8. Orlov G.A., Musabirov M.Kh., Suleymanov Ya.I., Issledovanie reologicheskikh i fil'tratsionnykh svoystv obratnykh emul'siy dlya sovershenstvovaniya napravlennogo khimicheskogo vozdeystviya na sloisto-neodnorodnyy plast (Investigation of the rheological and filtration properties of inverse emulsions to improve the directed chemical action on a layered heterogeneous formation) Collection of scientific papers TatNIPIneft, Bugul'ma: Publ. of TatNIPIneft', 1989, pp. 51–61.

9. Kotenev Yu.A., Khlebnikov V.N., Andreev V.E., Study of hydrophobic emulsions. Communication II. Hydrophobic water-oil emulsion based on natural emulsifier (In Russ.), Bashkirskiy khimicheskiy zhurnal, 2004, V. 11, no. 3, pp. 42–47.

10. Glushchenko V.N., Ptashko O.A., Kharisov R.Ya., Denisova A.V., Kislotnye obrabotki. Sostavy, mekhanizmy reaktsii. Dizayn (Acid treatments. Compositions, reaction mechanisms. Design), Ufa: Gilem Publ., 2010, 392 p.

11. Andreev V.E., Kotenev Yu.A., Nugaybekov A.G. et al.,  Povyshenie effektivnosti vyrabotki trudnoizvlekaemykh zapasov nefti karbonatnykh kollektorov (Improving the efficiency of developing hard-to-recover oil reserves of carbonate reservoirs), Ufa: Publ. of USPTU, 1997, 137 p.

12. Nasr-El-Din H.A., Taylor K.C., Al-Hajji H.H., Propagation of cross-linkers used in in-situ gelled acids in carbonate reservoirs, SPE-75257-MS, 2002, https://doi.org/10.2118/75257-MS

13. Taylor K.C., Nasr-EI-Din H.A., Laboratory evaluation of in-situ gelled acids for carbonate reservoirs, SPE-71694-MS, 2003, https://doi.org/10.2118/71694-MS

14. Nasr-El-Din H.A., Chesson J.B., Cawiezel K.E. et al., Lessons learned and guidelines for matrix acidizing with viscoelastic surfactant diversion in carbonate formations, SPE-102468-MS, 2006, https://doi.org/10.2118/102468-MS

15. Shipilov A.I., Krutikhin E.V., Kudrevatykh N.V. et al., New acid compositions for selective treatment of carbonate reservoir (In Russ.), Neftyanoe khozyaystvo = Oil Industry, 2012, no. 2, pp. 80–83.

16. Pestrikov A.V., Politov M.E., A viscoelastic surfactant based in-situ self-diverting acid systems: experiment and model (In Russ.), Neftegazovoe delo, 2013, no. 4, pp. 529–562.

17. Cherepanov S.S., Baldina T.R., Raspopov A.V. et al., Results of industrial replication of acid treatment technologies by using deflection systems at the deposits of LLC "LUKOIL-PERM" (In Russ.), Geologiya, geofizika i razrabotka neftyanykh i gazovykh mestorozhdeniy, 2019, no. 6 (330), pp. 19–28.

The huge part of remaining recoverable reserves of oil in Perm region is concentrated in complex structured stratified carbonate reservoirs. Thus, the task of improving the efficiency of oil field development and providing good control and adjustability of the field development process in the condition of intermittent  production is complicated with the increase of watercut while the recovery of reserves. That is why the approaches to bottomhole treatment and candidate wells selection are complicated. The importance of accurate fluid placement during acid treatment is increased. The bottomhole treatment often needs flow-diverters for successful acidizing.

The approaches and main results of laboratory testing of self-diverting acid systems and flow-diverters for complex acid treatments in stratified irregular reservoirs are given in the article. There is shown that self-diverting acid systems based on viscoelastic surfactants demonstrate an effect of flow diversion while the low value of permeability contrast. Decreasing of acid content in self-diverting acid system increases the effect of flow diversion due to increasing of viscosity of the acid while spending of acid. Flow-diverters based of invert emulsions have the high initial viscosity that’s why such kind of systems demonstrate the strong effect of flow diversion in case of higher irregularity and permeability contrast. Recommendations of using different flow-diverting systems for objects with different properties of reservoir based on laboratory tests are formulated. Regarded technologies are widely used in Perm region.

References

1. RakhmanovR.M ., Ismagilov F.Z., Fakhrutdinov G.N. et al., Razvitie tekhnologicheskikh aspektov ispol'zovaniya kislotnykh stimuliruyushchikh kompozitsiy «KSK-Tatneft'» i pervye rezul'taty ikh promyshlennogo vnedreniya (Development of technological aspects of the use of acid stimulating compositions "KSK-Tatneft" and the first results of their industrial implementation), Collection of scientific papers TatNIPIneft, Moscow: Neftyanoe khozyaystvo Publ., 2011, pp. 221–231.

2. Efimov O.D., Rakhmatullina Yu.Sh., Valiev M.F. et al., Application the self-diverting acid to increasing the production wells (on example Orenburg OGCF) (In Russ.), Ekspozitsiya Neft' Gaz, 2015, no. 7(46), pp. 48–50.

3. 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.

4. 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.

5. Glushchenko V.N., Obratnye emul'sii i suspenzii v neftegazovoy promyshlennosti (Inverse emulsions and suspensions in the oil and gas industry), Moscow: Interkontakt - Nauka Publ., 2008, 725 p.

6. Orlov G.A., Kendis M.Sh., Glushchenko V.N., Primenenie obratnykh emul’siy v neftedobyche (Application of inverse emulsions in oil production), Moscow: Nedra Publ., 1991, 225 p.

7. Makeev G.A., Sannikov V.A., Study of water-insulating properties of materials for carbonate reservoirs (In Russ.), Neftyanoe khozyaystvo = Oil Industry, 1987, no. 7, pp. 46–49.

8. Orlov G.A., Musabirov M.Kh., Suleymanov Ya.I., Issledovanie reologicheskikh i fil'tratsionnykh svoystv obratnykh emul'siy dlya sovershenstvovaniya napravlennogo khimicheskogo vozdeystviya na sloisto-neodnorodnyy plast (Investigation of the rheological and filtration properties of inverse emulsions to improve the directed chemical action on a layered heterogeneous formation) Collection of scientific papers TatNIPIneft, Bugul'ma: Publ. of TatNIPIneft', 1989, pp. 51–61.

9. Kotenev Yu.A., Khlebnikov V.N., Andreev V.E., Study of hydrophobic emulsions. Communication II. Hydrophobic water-oil emulsion based on natural emulsifier (In Russ.), Bashkirskiy khimicheskiy zhurnal, 2004, V. 11, no. 3, pp. 42–47.

10. Glushchenko V.N., Ptashko O.A., Kharisov R.Ya., Denisova A.V., Kislotnye obrabotki. Sostavy, mekhanizmy reaktsii. Dizayn (Acid treatments. Compositions, reaction mechanisms. Design), Ufa: Gilem Publ., 2010, 392 p.

11. Andreev V.E., Kotenev Yu.A., Nugaybekov A.G. et al.,  Povyshenie effektivnosti vyrabotki trudnoizvlekaemykh zapasov nefti karbonatnykh kollektorov (Improving the efficiency of developing hard-to-recover oil reserves of carbonate reservoirs), Ufa: Publ. of USPTU, 1997, 137 p.

12. Nasr-El-Din H.A., Taylor K.C., Al-Hajji H.H., Propagation of cross-linkers used in in-situ gelled acids in carbonate reservoirs, SPE-75257-MS, 2002, https://doi.org/10.2118/75257-MS

13. Taylor K.C., Nasr-EI-Din H.A., Laboratory evaluation of in-situ gelled acids for carbonate reservoirs, SPE-71694-MS, 2003, https://doi.org/10.2118/71694-MS

14. Nasr-El-Din H.A., Chesson J.B., Cawiezel K.E. et al., Lessons learned and guidelines for matrix acidizing with viscoelastic surfactant diversion in carbonate formations, SPE-102468-MS, 2006, https://doi.org/10.2118/102468-MS

15. Shipilov A.I., Krutikhin E.V., Kudrevatykh N.V. et al., New acid compositions for selective treatment of carbonate reservoir (In Russ.), Neftyanoe khozyaystvo = Oil Industry, 2012, no. 2, pp. 80–83.

16. Pestrikov A.V., Politov M.E., A viscoelastic surfactant based in-situ self-diverting acid systems: experiment and model (In Russ.), Neftegazovoe delo, 2013, no. 4, pp. 529–562.

17. Cherepanov S.S., Baldina T.R., Raspopov A.V. et al., Results of industrial replication of acid treatment technologies by using deflection systems at the deposits of LLC "LUKOIL-PERM" (In Russ.), Geologiya, geofizika i razrabotka neftyanykh i gazovykh mestorozhdeniy, 2019, no. 6 (330), pp. 19–28.



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