The Dynamic Process of CO<sub>2</sub> Leakage Along Wellbores Under Different Sequestration Conditions
Abandoned production and monitoring wells in depleted oil and gas fields can readily serve as primary leakage pathways for stored CO<sub>2</sub>. The temperature, pressure conditions around the wellbore bottom, and CO<sub>2</sub> concentration influence the phase behavior of...
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2025-03-01
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| author | Baolei Zhu Tianfu Xu Xi Zhang Chenglong Zhang Guanhong Feng |
| author_facet | Baolei Zhu Tianfu Xu Xi Zhang Chenglong Zhang Guanhong Feng |
| author_sort | Baolei Zhu |
| collection | DOAJ |
| description | Abandoned production and monitoring wells in depleted oil and gas fields can readily serve as primary leakage pathways for stored CO<sub>2</sub>. The temperature, pressure conditions around the wellbore bottom, and CO<sub>2</sub> concentration influence the phase behavior of CO<sub>2</sub> during leakage. This study establishes a 3D wellbore–reservoir coupled model using CO<sub>2</sub> injection data from 1 December 2009, in the DAS area, eastern Cranfield oilfield, Mississippi, USA, to analyze the dynamic evolution of CO<sub>2</sub> leakage along wellbores. Simulations are conducted using the collaboration of ECO2M and ECO2N v2.0 modules. The study examines leakage regimes under varying distances from the injection well and different reservoir temperatures. The results indicate that CO<sub>2</sub> phase changes occur primarily in wells near the injection point or under high-pressure and high CO<sub>2</sub> saturation conditions, usually with a short leakage period due to ice formation at the wellhead. In areas with low CO<sub>2</sub> saturation, prolonged leakage periods lead to significant pressure drops at the bottom, as well as the temperature as a result of the Joule–Thomson effect. Lower reservoir temperatures facilitate smoother and more gradual leakage. These findings provide a theoretical foundation for ensuring the safe implementation of CCUS projects and offer insights into the mechanical explanation of CO<sub>2</sub> geyser phenomena. |
| format | Article |
| id | doaj-art-818f7a1d8aaa4481b4ba527ab97d4f55 |
| institution | DOAJ |
| issn | 1996-1073 |
| language | English |
| publishDate | 2025-03-01 |
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| series | Energies |
| spelling | doaj-art-818f7a1d8aaa4481b4ba527ab97d4f552025-08-20T02:59:14ZengMDPI AGEnergies1996-10732025-03-01185123710.3390/en18051237The Dynamic Process of CO<sub>2</sub> Leakage Along Wellbores Under Different Sequestration ConditionsBaolei Zhu0Tianfu Xu1Xi Zhang2Chenglong Zhang3Guanhong Feng4Key Laboratory of Groundwater Resources and Environment, Ministry of Education, Jilin University, Changchun 130021, ChinaKey Laboratory of Groundwater Resources and Environment, Ministry of Education, Jilin University, Changchun 130021, ChinaSchool of Water Conservancy and Civil Engineering, Northeast Agricultural University, Harbin 150030, ChinaCenter for Hydrogeology and Environmental Geology Survey, China Geological Survey (CHEGS), Tianjin 300309, ChinaKey Laboratory of Groundwater Resources and Environment, Ministry of Education, Jilin University, Changchun 130021, ChinaAbandoned production and monitoring wells in depleted oil and gas fields can readily serve as primary leakage pathways for stored CO<sub>2</sub>. The temperature, pressure conditions around the wellbore bottom, and CO<sub>2</sub> concentration influence the phase behavior of CO<sub>2</sub> during leakage. This study establishes a 3D wellbore–reservoir coupled model using CO<sub>2</sub> injection data from 1 December 2009, in the DAS area, eastern Cranfield oilfield, Mississippi, USA, to analyze the dynamic evolution of CO<sub>2</sub> leakage along wellbores. Simulations are conducted using the collaboration of ECO2M and ECO2N v2.0 modules. The study examines leakage regimes under varying distances from the injection well and different reservoir temperatures. The results indicate that CO<sub>2</sub> phase changes occur primarily in wells near the injection point or under high-pressure and high CO<sub>2</sub> saturation conditions, usually with a short leakage period due to ice formation at the wellhead. In areas with low CO<sub>2</sub> saturation, prolonged leakage periods lead to significant pressure drops at the bottom, as well as the temperature as a result of the Joule–Thomson effect. Lower reservoir temperatures facilitate smoother and more gradual leakage. These findings provide a theoretical foundation for ensuring the safe implementation of CCUS projects and offer insights into the mechanical explanation of CO<sub>2</sub> geyser phenomena.https://www.mdpi.com/1996-1073/18/5/1237CO<sub>2</sub> leakageCranfieldmonitoring wellsphase change |
| spellingShingle | Baolei Zhu Tianfu Xu Xi Zhang Chenglong Zhang Guanhong Feng The Dynamic Process of CO<sub>2</sub> Leakage Along Wellbores Under Different Sequestration Conditions Energies CO<sub>2</sub> leakage Cranfield monitoring wells phase change |
| title | The Dynamic Process of CO<sub>2</sub> Leakage Along Wellbores Under Different Sequestration Conditions |
| title_full | The Dynamic Process of CO<sub>2</sub> Leakage Along Wellbores Under Different Sequestration Conditions |
| title_fullStr | The Dynamic Process of CO<sub>2</sub> Leakage Along Wellbores Under Different Sequestration Conditions |
| title_full_unstemmed | The Dynamic Process of CO<sub>2</sub> Leakage Along Wellbores Under Different Sequestration Conditions |
| title_short | The Dynamic Process of CO<sub>2</sub> Leakage Along Wellbores Under Different Sequestration Conditions |
| title_sort | dynamic process of co sub 2 sub leakage along wellbores under different sequestration conditions |
| topic | CO<sub>2</sub> leakage Cranfield monitoring wells phase change |
| url | https://www.mdpi.com/1996-1073/18/5/1237 |
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