A creep model for ultra-deep salt rock considering thermal-mechanical damage under triaxial stress conditions
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 de...
| Main Authors: | , , , , , |
|---|---|
| Format: | Article |
| Language: | English |
| Published: |
Elsevier
2024-02-01
|
| Series: | Journal of Rock Mechanics and Geotechnical Engineering |
| Subjects: | |
| Online Access: | http://www.sciencedirect.com/science/article/pii/S1674775523001956 |
| _version_ | 1827356704961986560 |
|---|---|
| author | Chao Liang Jianfeng Liu Jianxiong Yang Huining Xu Zhaowei Chen Lina Ran |
| author_facet | Chao Liang Jianfeng Liu Jianxiong Yang Huining Xu Zhaowei Chen Lina Ran |
| author_sort | Chao Liang |
| collection | DOAJ |
| description | 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 °C, 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. |
| first_indexed | 2024-03-08T05:13:48Z |
| format | Article |
| id | doaj.art-143227afbdce44e2889be069ab73d755 |
| institution | Directory Open Access Journal |
| issn | 1674-7755 |
| language | English |
| last_indexed | 2024-03-08T05:13:48Z |
| publishDate | 2024-02-01 |
| publisher | Elsevier |
| record_format | Article |
| series | Journal of Rock Mechanics and Geotechnical Engineering |
| spelling | doaj.art-143227afbdce44e2889be069ab73d7552024-02-07T04:44:18ZengElsevierJournal of Rock Mechanics and Geotechnical Engineering1674-77552024-02-01162588596A creep model for ultra-deep salt rock considering thermal-mechanical damage under triaxial stress conditionsChao Liang0Jianfeng Liu1Jianxiong Yang2Huining Xu3Zhaowei Chen4Lina Ran5College of Water Resource and Hydropower, Sichuan University, Chengdu, 610065, ChinaCollege of Water Resource and Hydropower, Sichuan University, Chengdu, 610065, China; CNPC Key Laboratory of Oil and Gas Underground Storage Engineering, Langfang, 065007, China; Corresponding author. College of Water Resource and Hydropower, Sichuan University. Chengdu, 610065, China.College of Water Resource and Hydropower, Sichuan University, Chengdu, 610065, ChinaCollege of Water Resource and Hydropower, Sichuan University, Chengdu, 610065, ChinaCNPC Engineering Technology R&D Company Limited, Beijing, 102206, ChinaCollege of Water Resource and Hydropower, Sichuan University, Chengdu, 610065, China; CNPC Key Laboratory of Oil and Gas Underground Storage Engineering, Langfang, 065007, ChinaTo 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 °C, 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.http://www.sciencedirect.com/science/article/pii/S1674775523001956Creep experimentsCreep modelThermal and mechanical damageFractional derivative |
| spellingShingle | Chao Liang Jianfeng Liu Jianxiong Yang Huining Xu Zhaowei Chen Lina Ran A creep model for ultra-deep salt rock considering thermal-mechanical damage under triaxial stress conditions Journal of Rock Mechanics and Geotechnical Engineering Creep experiments Creep model Thermal and mechanical damage Fractional derivative |
| title | A creep model for ultra-deep salt rock considering thermal-mechanical damage under triaxial stress conditions |
| title_full | A creep model for ultra-deep salt rock considering thermal-mechanical damage under triaxial stress conditions |
| title_fullStr | A creep model for ultra-deep salt rock considering thermal-mechanical damage under triaxial stress conditions |
| title_full_unstemmed | A creep model for ultra-deep salt rock considering thermal-mechanical damage under triaxial stress conditions |
| title_short | A creep model for ultra-deep salt rock considering thermal-mechanical damage under triaxial stress conditions |
| title_sort | creep model for ultra deep salt rock considering thermal mechanical damage under triaxial stress conditions |
| topic | Creep experiments Creep model Thermal and mechanical damage Fractional derivative |
| url | http://www.sciencedirect.com/science/article/pii/S1674775523001956 |
| work_keys_str_mv | AT chaoliang acreepmodelforultradeepsaltrockconsideringthermalmechanicaldamageundertriaxialstressconditions AT jianfengliu acreepmodelforultradeepsaltrockconsideringthermalmechanicaldamageundertriaxialstressconditions AT jianxiongyang acreepmodelforultradeepsaltrockconsideringthermalmechanicaldamageundertriaxialstressconditions AT huiningxu acreepmodelforultradeepsaltrockconsideringthermalmechanicaldamageundertriaxialstressconditions AT zhaoweichen acreepmodelforultradeepsaltrockconsideringthermalmechanicaldamageundertriaxialstressconditions AT linaran acreepmodelforultradeepsaltrockconsideringthermalmechanicaldamageundertriaxialstressconditions AT chaoliang creepmodelforultradeepsaltrockconsideringthermalmechanicaldamageundertriaxialstressconditions AT jianfengliu creepmodelforultradeepsaltrockconsideringthermalmechanicaldamageundertriaxialstressconditions AT jianxiongyang creepmodelforultradeepsaltrockconsideringthermalmechanicaldamageundertriaxialstressconditions AT huiningxu creepmodelforultradeepsaltrockconsideringthermalmechanicaldamageundertriaxialstressconditions AT zhaoweichen creepmodelforultradeepsaltrockconsideringthermalmechanicaldamageundertriaxialstressconditions AT linaran creepmodelforultradeepsaltrockconsideringthermalmechanicaldamageundertriaxialstressconditions |