Integrity of cement sheath is critical for safe and effective operation of heavy oil wells. The cement sheath has been generally treated as elastic solid in existing models for integrity analysis. However, it has been evidenced by some recent research findings that cement is essentially a porous solid, and thus poroelasticity effect may be remarkable. In this paper, we established a transient poro-thermomechanical coupling finite element model and investigated the pore pressure and stress evolution within the cement sheath during the heat injection process of heavy oil wells, with the emphasis on clarifying the effect of poroelasticity of cement and formation on the integrity of cement sheath. It is found that temperature rise during heat injection results in considerable pore pressure increase and thus greatly affects the stress distribution within the cement sheath. For the cement sheath between the casing and the rock formation, the pore pressure within the cement sheath decreases gradually with time due to fluid diffusion into the formation. In contrast, the high pore pressure remains almost constant within the cement sheath between two casings, resulting in tensile effective stress within the cement sheath and raise a high risk of failure, which cannot be predicted by existing elasticity model.
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References
R. Fang. Review on horizontal well development of low permeability reservoir[J]. Journal of Chifeng University in Natural Science Edition,2013,29(14):110-111.
S. Q. Liu, D. Q. Li, J. P. Yuan, et al. Casing sheath integrity of shale gas wells: A case study from the Sichuan Basin[J]. Natural Gas Industry, 2017, 37(7): 76-82.
K. Liu, D. L. Gao, J. Zeng, et al. Annulus pressure analysis of a shale gas well under varied temperature and pressures[J]. Petroleum Drilling Techniques, 2017, 45(3): 8-14.
X. P. Li, D. W. Wang, J. Lin, et al. Calculation of steam parameters in wellbore of heavy oil thermal recovery well [J]. Xinjiang oil & gas, 2011,7 (1): 68-71
L. l. Zhao, X. D. Lei, X. H. Li, et al. Discussion on casing damage repair technology of heavy oil thermal recovery wells [J]. Xinjiang oil & gas, 2010,6 (4): 71-75.
J. Y. Shen, L. Shi, Y. Li, et al. Analysis and perspective of cement sheath integrity under high differential pressure[J]. Natural Gas Industry, 2017, 37(4): 98- 108.
J. G. Deng. Simulation test of the influence of cement sheath properties on casing load[J]. Journal of the University of Petroleum (Natural Science Edition),1997(06):24-28+116.
M. Bosma, K. Ravi, W. Driel, G. J. Schreppers. Design Approach to Sealant Selection for the Life of the Well. Society of Petroleum Engineers,1999.
J. Li, M. Chen, H. Zhang, et al. Influence of cement ring shape on casing stress under different in-situ stress conditions. Natural gas industry, 2004, 24(8):50-52.
K. E. Gray, E. Podnos, E. Becker. Finite-element studies of the near-wellbore region during cementing operations: Part I [J]. SPE Drilling & completion, 2009, 24(01): 127-136.
J. F. Zhang, Y. B. Lu, S. Q. Liu, M. X, Q. Zhang, Y. Li. Adaptability between mechanical parameters and load of cement sheath[J]. Oil drilling and Production Technology,2016,38(05):594-600.
G. Raoof, A. Brent, F. Nikoo. A thermo-poroelastic analytical approach to evaluate cement sheath integrity in deep vertical wells[J]. Journal of Petroleum Science and Engineering, 2016, 147: 536-546.
D. A. Jesus, S. Sigbjørn. Cement sheath failure mechanisms: numerical estimates to design for long-term well integrity [J]. Journal of Petroleum Science and Engineering, 2016, 147: 682-698
D. M. Fourmaintraux, A. P. Bois, B. Fraboulet. Efficient wellbore cement sheath design using the SRC (System Response Curve) method[C]//SPE Europec/EAGE Annual Conference. Society of Petroleum Engineers, 2005.
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The authors wish to acknowledge the financial support from the Petrochina Xinjiang Oilfield Company (Engineering Technology Institute).
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Translated from Khimiya i Tekhnologiya Topliv i Masel, No. 5, pp. 105–112 September–October, 2022.
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Wang, Z., Wen, Y., Li, Y. et al. Effect of Poroelasticity on the Integrity of Cement Sheath in Heavy Oil Wells. Chem Technol Fuels Oils 58, 851–861 (2022). https://doi.org/10.1007/s10553-022-01460-x
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DOI: https://doi.org/10.1007/s10553-022-01460-x