PSI - Issue 36

330 Liubov Poberezhna et al. / Procedia Structural Integrity 36 (2022) 326–333 Liubov Poberezhna, Ihor Chudyk, Volodymyr Khomyn et al. / Structural Integrity Procedia 00 (2021) 000 – 000

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Cemented conductor after its descent;

5. Cemented section of the first technical casing in the conductor; 6. Cemented section of the first technical casing in the open wellbore; 7. The first technical casing; 8. Depressurization of the second technical casing on the site lined with the first technical column; 9. Cemented section of the second technical casing in the casing well by the first technical column; 10. Depressurization of the production column on the site lined with the second technical column; 11. Cemented section of the production column in the casing well by the second technical column; 12. The second technical casing; 13. Cemented section of the second technical casing in the open wellbore; 14. Cemented section of the production string in the open wellbore; 15. Operational column; 16. Productive oil and gas horizon with high formation pressure P1; 17. Perforation of the production string in the area of the productive horizon 16; 18. Depressurization of the production column in the uncoated column; 19. Possible penetration of the high-pressure fluid into layer 20 with low-pressure P2; 20. Productive layer with low-pressure P2; 21. Depressurization in the lower part of the production column, which is lined with the second technical column; 22. Depressurization of the second technical column in the open wellbore; 23. The movement of the fluid from the reservoir 20 with low-pressure P2 after it enters the stream 19 with high pressure in the surface water layers 3; 24. The movement of fluid to the water layer 3 and to the surface, including the atmosphere; 25. Depressurization of the first technical column; 26. Transfer of fluid to the water horizon 3 and into surface waters; 27. Uncontrolled release of fluid to the surface (water bodies, atmosphere).

Fig. 4. Scheme of the operational oil and gas well with possible faults of the sealing of the casing.