Numerical Simulation of Gas Hydrate Production Using the Cyclic Depressurization Method in the Ulleung Basin of the Korea East Sea
The depressurization method is known as the most productive and effective method for successful methane recovery from hydrate deposits. However, this method can cause considerable subsidence because of the increased effective stress. Maintenance of geomechanical stability is necessary for sustainabl...
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MDPI AG
2021-10-01
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| Online Access: | https://www.mdpi.com/2076-3417/11/20/9748 |
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| author | Taehun Lee Joo Yong Lee Taewoong Ahn Han Am Son |
| author_facet | Taehun Lee Joo Yong Lee Taewoong Ahn Han Am Son |
| author_sort | Taehun Lee |
| collection | DOAJ |
| description | The depressurization method is known as the most productive and effective method for successful methane recovery from hydrate deposits. However, this method can cause considerable subsidence because of the increased effective stress. Maintenance of geomechanical stability is necessary for sustainable production of gas from gas hydrate deposits. In this study, the cyclic depressurization method, which uses changing the bottomhole pressure and production time during primary and secondary depressurization stage, was utilized in order to increase stability in the Ulleung Basin of the Korea East Sea. Various case studies were conducted with alternating bottomhole pressure and production time of the primary and secondary depressurization stages over 400 days. Geomechanical stability was significantly enhanced, while cumulative gas production was relatively less reduced or nearly maintained. Specially, the cumulative gas production of the 6 MPa case was more than three times higher than that of the 9 MPa case, while vertical displacement was similar between them. Therefore, it was found that the cyclic depressurization method should be applied for the sake of geomechanical stability. |
| first_indexed | 2024-03-10T06:44:32Z |
| format | Article |
| id | doaj.art-a228e1865f0a4b12b664c6ebf2abeefe |
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| issn | 2076-3417 |
| language | English |
| last_indexed | 2024-03-10T06:44:32Z |
| publishDate | 2021-10-01 |
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| spelling | doaj.art-a228e1865f0a4b12b664c6ebf2abeefe2023-11-22T17:23:46ZengMDPI AGApplied Sciences2076-34172021-10-011120974810.3390/app11209748Numerical Simulation of Gas Hydrate Production Using the Cyclic Depressurization Method in the Ulleung Basin of the Korea East SeaTaehun Lee0Joo Yong Lee1Taewoong Ahn2Han Am Son3Petroleum and Marine Research Division, Korea Institute of Geosciences and Minerals, Daejeon 34132, KoreaPetroleum and Marine Research Division, Korea Institute of Geosciences and Minerals, Daejeon 34132, KoreaPetroleum and Marine Research Division, Korea Institute of Geosciences and Minerals, Daejeon 34132, KoreaDepartment of Energy Resources Engineering, Pukyong National University, Busan 48547, KoreaThe depressurization method is known as the most productive and effective method for successful methane recovery from hydrate deposits. However, this method can cause considerable subsidence because of the increased effective stress. Maintenance of geomechanical stability is necessary for sustainable production of gas from gas hydrate deposits. In this study, the cyclic depressurization method, which uses changing the bottomhole pressure and production time during primary and secondary depressurization stage, was utilized in order to increase stability in the Ulleung Basin of the Korea East Sea. Various case studies were conducted with alternating bottomhole pressure and production time of the primary and secondary depressurization stages over 400 days. Geomechanical stability was significantly enhanced, while cumulative gas production was relatively less reduced or nearly maintained. Specially, the cumulative gas production of the 6 MPa case was more than three times higher than that of the 9 MPa case, while vertical displacement was similar between them. Therefore, it was found that the cyclic depressurization method should be applied for the sake of geomechanical stability.https://www.mdpi.com/2076-3417/11/20/9748cyclic depressurization methodgeomechanical simulationsubsidencegas hydrateUlleung Basin |
| spellingShingle | Taehun Lee Joo Yong Lee Taewoong Ahn Han Am Son Numerical Simulation of Gas Hydrate Production Using the Cyclic Depressurization Method in the Ulleung Basin of the Korea East Sea Applied Sciences cyclic depressurization method geomechanical simulation subsidence gas hydrate Ulleung Basin |
| title | Numerical Simulation of Gas Hydrate Production Using the Cyclic Depressurization Method in the Ulleung Basin of the Korea East Sea |
| title_full | Numerical Simulation of Gas Hydrate Production Using the Cyclic Depressurization Method in the Ulleung Basin of the Korea East Sea |
| title_fullStr | Numerical Simulation of Gas Hydrate Production Using the Cyclic Depressurization Method in the Ulleung Basin of the Korea East Sea |
| title_full_unstemmed | Numerical Simulation of Gas Hydrate Production Using the Cyclic Depressurization Method in the Ulleung Basin of the Korea East Sea |
| title_short | Numerical Simulation of Gas Hydrate Production Using the Cyclic Depressurization Method in the Ulleung Basin of the Korea East Sea |
| title_sort | numerical simulation of gas hydrate production using the cyclic depressurization method in the ulleung basin of the korea east sea |
| topic | cyclic depressurization method geomechanical simulation subsidence gas hydrate Ulleung Basin |
| url | https://www.mdpi.com/2076-3417/11/20/9748 |
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