首页|A creep model for ultra-deep salt rock considering thermal-mechanical damage under triaxial stress conditions

A creep model for ultra-deep salt rock considering thermal-mechanical damage under triaxial stress conditions

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To investigate the specific creep behavior of ultra-deep buried salt during oil and gas exploitation,a set of triaxial creep experiments was conducted at elevated temperatures with constant axial pressure and unloading confining pressure conditions.Experimental results show that the salt sample deforms more significantly with the increase of applied temperature and deviatoric loading.The accelerated creep phase is not occurring until the applied temperature reaches 130 ℃,and higher temperature is beneficial to the occurrence of accelerated creep.To describe the specific creep behavior,a novel three-dimensional(3D)creep constitutive model is developed that incorporates the thermal and mechanical variables into mechanical elements.Subsequently,the standard particle swarm optimization(SPSO)method is adopted to fit the experimental data,and the sensibility of key model parameters is analyzed to further illustrate the model function.As a result,the model can accurately predict the creep behavior of salt under the coupled thermo-mechanical effect in deep-buried condition.Based on the research results,the creep mechanical behavior of wellbore shrinkage is predicted in deep drilling projects crossing salt layer,which has practical implications for deep rock mechanics problems.

Creep experimentsCreep modelThermal and mechanical damageFractional derivative

Chao Liang、Jianfeng Liu、Jianxiong Yang、Huining Xu、Zhaowei Chen、Lina Ran

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College of Water Resource and Hydropower,Sichuan University,Chengdu,610065,China

CNPC Key Laboratory of Oil and Gas Underground Storage Engineering,Langfang,065007,China

CNPC Engineering Technology R&D Company Limited,Beijing,102206,China

Scientific and technological research projects in Sichuan provinceScientific and technological research projects in Sichuan provinceNational Scientific Science Foundation of China

2022YFSY00072021YFH0010U20A20266

2024

10.1016/j.jrmge.2023.06.009

岩石力学与岩土工程学报(英文版)
中国科学院武汉岩土力学所中国岩石力学与工程学会武汉大学

岩石力学与岩土工程学报(英文版)

CSTPCD
影响因子：0.404
ISSN：1674-7755
年,卷(期)：2024.16(2)
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