PSI - Issue 58

ScienceDirect Structural Integrity Procedia 00 (2023) 000–000 Structural Integrity Procedia 00 (2023) 000–000 Available online at www.sciencedirect.com Available online at www.sciencedirect.com ScienceDirect Available online at www.sciencedirect.com ScienceDirect

www.elsevier.com/locate/procedia www.elsevier.com/locate/procedia

Procedia Structural Integrity 58 (2024) 144–149

© 2024 The Authors. Published by Elsevier B.V. This is an open access article under the CC BY-NC-ND license (https://creativecommons.org/licenses/by-nc-nd/4.0) Peer-review under responsibility of the ICSID 2023 Organizers Abstract Salt rock has a good sealing ability for oil and gas, but the creep of salt rock may cause wellbore integrity failure, and even cause safety accidents and economic losses in serious cases. Based on the creep law of salt rock obtained from the creep experiment of salt rock, the finite element model of casing-cement sheath-formation combination in salt rock formation is established. The effect of formation creep on the integrity of cement sheath under different uniform in-situ stress conditions is studied. The results show that the creep of salt rock will cause the shear failure of the cement sheath; reducing the elastic modulus of the cement sheath and increasing the Poisson's ratio of cement sheath will reduce the risk of shear failure of the cement sheath. © 2024 The Authors. Published by ELSEVIER B.V. This is an open access article under the CC BY-NC-ND license (https://creativecommons.org/licenses/by-nc-nd/4.0) Peer-review under responsibility of the ICSID 2023 Organizers Keywords: Creep of the salt rock formation; finite element method; failure of cement sheath integrity; in-situ stress 1. Introduction The porosity and permeability of salt rock are extremely low, which has an excellent sealing ability for oil and natural gas. Salt rocks are common in gas storage on depleted oil and gas reservoirs and salt cavern gas storage (Cornet 7th International Conference on Structural Integrity and Durability (ICSID 2023) Effects of creep of the salt rock formation on the failure of cement sheath integrity Heng Yang a,b , Yuhuan Bu a,b *, ShaoRui Jing a,b , Lingyun Zhao c,d , Shenglai Guo a,b , Huajie Liu a,b a Key Laboratory of Unconventional Oil & Gas Development, China University of Petroleum (East China), Qingdao 266580, P. R. China b School of Petroleum Engineering, China University of Petroleum (East China), Qingdao 266580, P. R. China c Key Laboratory of Unconventional Natural Gas Evaluation and Development in Complex Tectonic Areas, Ministry of Natural Resources, Guiyang 550081, P. R. China d Guizhou Engineering Research Institute of Oil&Gas Exploration and Development, Guiyang 550081, P. R. China Abstract Salt rock has a good sealing ability for oil and gas, but the creep of salt rock may cause wellbore integrity failure, and even cause safety accidents and economic losses in serious cases. Based on the creep law of salt rock obtained from the creep experiment of salt rock, the finite element model of casing-cement sheath-formation combination in salt rock formation is established. The effect of formation creep on the integrity of cement sheath under different uniform in-situ stress conditions is studied. The results show that the creep of salt rock will cause the shear failure of the cement sheath; reducing the elastic modulus of the cement sheath and increasing the Poisson's ratio of cement sheath will reduce the risk of shear failure of the cement sheath. © 2024 The Authors. Published by ELSEVIER B.V. This is an open access article under the CC BY-NC-ND license (https://creativecommons.org/licenses/by-nc-nd/4.0) Peer-review under responsibility of the ICSID 2023 Organizers Keywords: Creep of the salt rock formation; finite element method; failure of cement sheath integrity; in-situ stress 1. Introduction The porosity and permeability of salt rock are extremely low, which has an excellent sealing ability for oil and natural gas. Salt rocks are common in gas storage on depleted oil and gas reservoirs and salt cavern gas storage (Cornet 7th International Conference on Structural Integrity and Durability (ICSID 2023) Effects of creep of the salt rock formation on the failure of cement sheath integrity Heng Yang a,b , Yuhuan Bu a,b *, ShaoRui Jing a,b , Lingyun Zhao c,d , Shenglai Guo a,b , Huajie Liu a,b a Key Laboratory of Unconventional Oil & Gas Development, China University of Petroleum (East China), Qingdao 266580, P. R. China b School of Petroleum Engineering, China University of Petroleum (East China), Qingdao 266580, P. R. China c Key Laboratory of Unconventional Natural Gas Evaluation and Development in Complex Tectonic Areas, Ministry of Natural Resources, Guiyang 550081, P. R. China d Guizhou Engineering Research Institute of Oil&Gas Exploration and Development, Guiyang 550081, P. R. China

* Corresponding author. Tel.: 13884951607. E-mail address: buyuhuan@163.com * Corresponding author. Tel.: 13884951607. E-mail address: buyuhuan@163.com

2452-3216 © 2024 The Authors. Published by ELSEVIER B.V. This is an open access article under the CC BY-NC-ND license (https://creativecommons.org/licenses/by-nc-nd/4.0) Peer-review under responsibility of the scientific committee of the ICSID 2023 Organizers 2452-3216 © 2024 The Authors. Published by ELSEVIER B.V. This is an open access article under the CC BY-NC-ND license (https://creativecommons.org/licenses/by-nc-nd/4.0) Peer-review under responsibility of the scientific committee of the ICSID 2023 Organizers

2452-3216 © 2024 The Authors. Published by ELSEVIER B.V. This is an open access article under the CC BY-NC-ND license (https://creativecommons.org/licenses/by-nc-nd/4.0) Peer-review under responsibility of the ICSID 2023 Organizers 10.1016/j.prostr.2024.05.023