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On necessity of targeted approach to selection of chemical systems for bottomhole zone treatment of Tulskian-Bobrikovskian reservoirs

UDK: 622.276.63
DOI: 10.24887/0028-2448-2018-7-20-23
Key words: mud acid treatment, alkali, acid, sandstone reservoir, surfactants, Tulskian-Bobrikovskian sediments
Authors: N.G. Ibragimov (Tatneft PJSC, RF, Almetyevsk), M.Kh. Musabirov (TatNIPIneft, RF, Bugulma), A.Yu. Dmitrieva (TatNIPIneft, RF, Bugulma), I.M. Nasibullin (RtsiChimTech Regional Engineering Center), M.T. Khannanov (Tatneft PJSC, RF, Almetyevsk)

Mud acid treatment is a conventional chemical enhanced oil recovery method commonly used in sandstone reservoirs. The paper presents results of analysis of field data, review of domestic and foreign literature, and patent research on chemistry and technologies of bottomhole zone mud acid treatments in sandstone reservoirs. It was found out that application of hydrofluoric acid for treatment of sandstones containing clayey and carbonate rocks initiates adverse physical and chemical processes in situ resulting in formation of reservoir-damaging compounds in the near-wellbore zone. Besides, HF acid is characterized by increased toxicity and corrosivity. The solution of the problem is seen in improvement of efficiency of mud acid treatments through improved design of HF acid-free chemical compositions and advanced injection technologies.

The first stage of the project involved lithological analysis to understand and to describe the mineral composition of the Tulskian-Bobrikovskian core samples. More than 50 core samples (sandstones, siltstones, mudstones) from the Ersubaikinskoye, Arkhangelskoye, Vostochno-Ekaterinovskoye, Tyugeevskoye, Shegurchinskoye have been analyzed, including radiographic and micrographic studies of thin sections. The second stage involved morphological and genetic analysis of clayey minerals to understand the possible effect on the reservoir properties following mud acid treatments. Studies using X-raying, optical and scanning electron microscopes provided quality visualization of pore space, as well as main quantitative core parameters for future model studies and chemical treatment control: volume of pore space, total volume of a core sample, pore space volume to total core sample volume ratio, number of pores in the core sample. The first results of physical modeling studies demonstrated the necessity and the importance of targeted stimulation of various lithological types of reservoirs, even of the same formation.


Based on the results of
the studies, two base chemical compositions have been formulated: inhibited
synthetic hydrochloric acid + complexon based on phosphonic acid + surfactants
for treatmentВ  of the Tulskian reservoirs
represented by siltstones with clayey-carbonate cement, and alkali + complexon
based on derivatives of tetraacetic acid + surfactants for treatmentВ  of the Bobrikovskian reservoirs made of silty
sandstones. These systems are recommended for pilot testing in producing wells
of the Oil and Gas Production Department Yamashneft (test site of the Visean
Tulskian-Bobrikovskian productive formations

References

1. Patent no. 2308475 RF, MPK S 09 K 8/74, Composition for acid treatment of critical zone of formation (Variants), Inventor: Musabirov M.Kh.

2. Glushchenko V.N., Silin M.A., Neftepromyslovaya khimiya (Oilfield chemistry), Part 4. Kislotnaya obrabotka skvazhin (Acid treatment of wells): edited by Mishchenko I.T., Moscow: Interkontakt Nauka Publ., 2010, 703 s.

3. Musabirov M.Kh., Sokhranenie i uvelichenie produktivnosti neftyanykh plastov (Preserving and increasing the productivity of oil reservoirs), Kazan': FEN Publ., 2007, 424 p.

4. Magadova L.A. et al., Generation of sedimentation in the interaction with acid compositions of a terrigene reservoir (In Russ.), Neftepromyslovoe delo, 2015, no. 9, pp. 31-36.

5. Patent no. 2182963 RF, MPK E 21 V 43/27, Acid composition for treating terrigenous reservoirs, Inventors: Akhmetshin I.D., Kol'chugin I.S., Limanovskiy V.M., Litvinov M.V., Lyshko O.G., Osenov N.L., Osipov E.V., Samorodskaya N.E., Filipov V.T.

6. Patent no. 2433260 RF, MPK E 21 V 43/27, S 09 K 8/74, Method of sour well intervention in terriogenous reservoir, Inventors:В  Grebennikov V.T., Kachalov O.B., Potekhin V.A., Kornilova E.S.

7. Patent no. 2244816 RF, MPK E 21 V 43/27, Acid composition for treating terrigenous oil reservoirs and a method for acid treatment of bottom area of formation, Inventors:В  Magadov R.S, Magadova L.A., Nikolaeva N.M., Pakhomov M.D., Gubanov V.B., Magadov V.R., Chekalina Gul'chekhra, Silin M.A., Gaevoy E.G., Rud' M.I., Zaytsev K.I.

8. Kryanev D.Yu. et al., Razrabotka kislotnykh kompozitsiy dlya intensifikatsii dobychi nefti iz terrigennykh kollektorov primenitel'no k usloviyam mestorozhdeniy Zapadnoy Sibiri (Development of acid compositions for the intensification of oil production from terrigenous reservoirs in relation to the conditions of the fields of Western Siberia), Collected papers “Problemy razrabotki mestorozhdeniy s trudnoizvlekaemymi zapasami nefti” (Problems of developing deposits with hard-to-recover oil reserves), Proceedings of VNIIneft' OAO, Moscow,В  2006, V. 134, pp. 6-14.

9. Nasibulin I.M., Misolina N.A., Baymashev B.A., Uchet vliyaniya glinistoy sostavlyayushchey na rezul'tativnost' primeneniya metodov intensifikatsii v terrigennykh kollektorakh (Taking into account the influence of the clay component on the effectiveness of the application of intensification methods in terrigenous reservoirs), Collected papers “Vysokovyazkie nefti i prirodnye bitumy: problemy i povyshenie effektivnosti razvedki i razrabotki mestorozhdeniy” (High viscosity oil and natural bitumen: problems and increasing the efficiency of exploration and development of deposits), Proceedings of Scientific and Practical Conference, dedicated to the memory of Diyashev R.N., Kazan' 5-7 September 2012, Kazan': Fen Publ., 2012, pp. 279-281.

10. Davletov Z.R., Razrabotka i issledovanie ftorsoderzhashchikh kislotnykh sostavov, ne vyzyvayushchikh obrazovaniya osadkov v terrigennom plaste (Development and investigation of fluorine-containing acidic compositions that do not cause precipitation in the terrigenous layer): thesis of candidate of technical science, Moscow: 2016.

11. Silin M.A. et al., Kislotnye obrabotki plastov i metodiki ispytaniya kislotnykh sostavov (Acid formation treatment and methods for acid compositions testing), Moscow: Publ. of Gubkin Russin State University of Oil and Gas, 2011, 120 p.

12. Ibragimov G.Z., Sorokin V.A., Khisamutdinov N.I., Khimicheskie reagent dlya dobychi nefti (Chemical reagents for oil extraction), Moscow: Nedra Publ., 1986, 240 p.


Mud acid treatment is a conventional chemical enhanced oil recovery method commonly used in sandstone reservoirs. The paper presents results of analysis of field data, review of domestic and foreign literature, and patent research on chemistry and technologies of bottomhole zone mud acid treatments in sandstone reservoirs. It was found out that application of hydrofluoric acid for treatment of sandstones containing clayey and carbonate rocks initiates adverse physical and chemical processes in situ resulting in formation of reservoir-damaging compounds in the near-wellbore zone. Besides, HF acid is characterized by increased toxicity and corrosivity. The solution of the problem is seen in improvement of efficiency of mud acid treatments through improved design of HF acid-free chemical compositions and advanced injection technologies.

The first stage of the project involved lithological analysis to understand and to describe the mineral composition of the Tulskian-Bobrikovskian core samples. More than 50 core samples (sandstones, siltstones, mudstones) from the Ersubaikinskoye, Arkhangelskoye, Vostochno-Ekaterinovskoye, Tyugeevskoye, Shegurchinskoye have been analyzed, including radiographic and micrographic studies of thin sections. The second stage involved morphological and genetic analysis of clayey minerals to understand the possible effect on the reservoir properties following mud acid treatments. Studies using X-raying, optical and scanning electron microscopes provided quality visualization of pore space, as well as main quantitative core parameters for future model studies and chemical treatment control: volume of pore space, total volume of a core sample, pore space volume to total core sample volume ratio, number of pores in the core sample. The first results of physical modeling studies demonstrated the necessity and the importance of targeted stimulation of various lithological types of reservoirs, even of the same formation.


Based on the results of
the studies, two base chemical compositions have been formulated: inhibited
synthetic hydrochloric acid + complexon based on phosphonic acid + surfactants
for treatmentВ  of the Tulskian reservoirs
represented by siltstones with clayey-carbonate cement, and alkali + complexon
based on derivatives of tetraacetic acid + surfactants for treatmentВ  of the Bobrikovskian reservoirs made of silty
sandstones. These systems are recommended for pilot testing in producing wells
of the Oil and Gas Production Department Yamashneft (test site of the Visean
Tulskian-Bobrikovskian productive formations

References

1. Patent no. 2308475 RF, MPK S 09 K 8/74, Composition for acid treatment of critical zone of formation (Variants), Inventor: Musabirov M.Kh.

2. Glushchenko V.N., Silin M.A., Neftepromyslovaya khimiya (Oilfield chemistry), Part 4. Kislotnaya obrabotka skvazhin (Acid treatment of wells): edited by Mishchenko I.T., Moscow: Interkontakt Nauka Publ., 2010, 703 s.

3. Musabirov M.Kh., Sokhranenie i uvelichenie produktivnosti neftyanykh plastov (Preserving and increasing the productivity of oil reservoirs), Kazan': FEN Publ., 2007, 424 p.

4. Magadova L.A. et al., Generation of sedimentation in the interaction with acid compositions of a terrigene reservoir (In Russ.), Neftepromyslovoe delo, 2015, no. 9, pp. 31-36.

5. Patent no. 2182963 RF, MPK E 21 V 43/27, Acid composition for treating terrigenous reservoirs, Inventors: Akhmetshin I.D., Kol'chugin I.S., Limanovskiy V.M., Litvinov M.V., Lyshko O.G., Osenov N.L., Osipov E.V., Samorodskaya N.E., Filipov V.T.

6. Patent no. 2433260 RF, MPK E 21 V 43/27, S 09 K 8/74, Method of sour well intervention in terriogenous reservoir, Inventors:В  Grebennikov V.T., Kachalov O.B., Potekhin V.A., Kornilova E.S.

7. Patent no. 2244816 RF, MPK E 21 V 43/27, Acid composition for treating terrigenous oil reservoirs and a method for acid treatment of bottom area of formation, Inventors:В  Magadov R.S, Magadova L.A., Nikolaeva N.M., Pakhomov M.D., Gubanov V.B., Magadov V.R., Chekalina Gul'chekhra, Silin M.A., Gaevoy E.G., Rud' M.I., Zaytsev K.I.

8. Kryanev D.Yu. et al., Razrabotka kislotnykh kompozitsiy dlya intensifikatsii dobychi nefti iz terrigennykh kollektorov primenitel'no k usloviyam mestorozhdeniy Zapadnoy Sibiri (Development of acid compositions for the intensification of oil production from terrigenous reservoirs in relation to the conditions of the fields of Western Siberia), Collected papers “Problemy razrabotki mestorozhdeniy s trudnoizvlekaemymi zapasami nefti” (Problems of developing deposits with hard-to-recover oil reserves), Proceedings of VNIIneft' OAO, Moscow,В  2006, V. 134, pp. 6-14.

9. Nasibulin I.M., Misolina N.A., Baymashev B.A., Uchet vliyaniya glinistoy sostavlyayushchey na rezul'tativnost' primeneniya metodov intensifikatsii v terrigennykh kollektorakh (Taking into account the influence of the clay component on the effectiveness of the application of intensification methods in terrigenous reservoirs), Collected papers “Vysokovyazkie nefti i prirodnye bitumy: problemy i povyshenie effektivnosti razvedki i razrabotki mestorozhdeniy” (High viscosity oil and natural bitumen: problems and increasing the efficiency of exploration and development of deposits), Proceedings of Scientific and Practical Conference, dedicated to the memory of Diyashev R.N., Kazan' 5-7 September 2012, Kazan': Fen Publ., 2012, pp. 279-281.

10. Davletov Z.R., Razrabotka i issledovanie ftorsoderzhashchikh kislotnykh sostavov, ne vyzyvayushchikh obrazovaniya osadkov v terrigennom plaste (Development and investigation of fluorine-containing acidic compositions that do not cause precipitation in the terrigenous layer): thesis of candidate of technical science, Moscow: 2016.

11. Silin M.A. et al., Kislotnye obrabotki plastov i metodiki ispytaniya kislotnykh sostavov (Acid formation treatment and methods for acid compositions testing), Moscow: Publ. of Gubkin Russin State University of Oil and Gas, 2011, 120 p.

12. Ibragimov G.Z., Sorokin V.A., Khisamutdinov N.I., Khimicheskie reagent dlya dobychi nefti (Chemical reagents for oil extraction), Moscow: Nedra Publ., 1986, 240 p.



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