PSI - Issue 58

Heng Yang et al. / Procedia Structural Integrity 58 (2024) 144–149 H. Yang et al./ Structural Integrity Procedia 00 (2022) 000–000

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0.0025

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PEEQ

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Poisson's ratio of cement sheath

Elastic Modulus of Cement Sheath(GPa)

Fig. 5 Effect of elastic parameters of the cement sheath on PEEQ of the cement sheath: (a) elastic modulus of the cement sheath; (b) Poisson’s ratio of the cement sheath. 4. Conclusions By concluding the above research contents, the following conclusions can be drawn:  The creep law of salt rock obeys the power law model.  Creep of salt rock formation under uniform in-situ stress loads can cause shear failure of the cement sheath.  Reducing the elastic modulus of the cement sheath and increasing the Poisson’s ratio of the cement sheath can reduce the risk of the failure of the cement sheath integrity under the condition of the salt rock creep. Acknowledgements This study was funded by the Provincial Geological Exploration Fund of Guizhou Province (208-9912-JBN UTS0). References Bu, Y., Yang, H., Zhao, L., Guo, S., Liu, H., Ma, X. , 2022. Stress concentration of perforated cement sheath and the effect of cement sheath elastic parameters on its integrity failure during shale gas fracturing. Frontiers in Materials 9, 980920. Bu, Y., Tian, L., Guo, B., Wang, C., Sun, B., 2020. Experiment and simulation on the integrity of cement ring interface in deep water shallow formation. Journal of Petroleum Science and Engineering 190, 107127. Bu, Y., Ma, R., Guo, S., Du, J., Liu, H., Cao, X., 2020. A theoretical evaluation method for mechanical sealing integrity of cementing sheath. Applied Mathematical Modelling 84, 571-589. Chu, W., Shen J., Yang, Y., Li, Y., Gao, D., 2015. Calculation of micro-annulus size in casing-cement sheath-formation system under continuous internal casing pressure change. Petroleum Exploration and Development 42(3), 414-421. Cornet, J. S., Dabrowski, M., Schmid, D. W., 2018. Long term creep closure of salt cavities. International Journal of Rock Mechanics and Mining Sciences 103, 96-106. De Andrade, J., Sangesland, S., 2016. Cement Sheath Failure Mechanisms: Numerical Estimates to Design for Long-Term Well Integrity. Journal of Petroleum Science and Engineering 147, 682-698. Firme, P. A. L. P., Roehl, D., Romanel, C., 2019. Salt caverns history and geomechanics towards future natural gas strategic storage in Brazil. Journal of Natural Gas Science and Engineering 72, 103006. Guo, S., Bu, Y., Yang, X., Wang, C., Guo, B., Sun, B., 2020. Effect of casing internal pressure on integrity of cement ring in marine shallow formation based on XFEM. Engineering Failure Analysis 108, 104258. Guo, Y., Blanford, M., Candella, J. D., 2015. Evaluating the Risk of Casing Failure Caused by High-Density Perforation: A 3D Finite-Element Method Study of Compaction-Induced Casing Deformation in a Deepwater Reservoir, Gulf of Mexico. SPE Drilling & Completion 30(02), 141-151.