Numerical Simulation of the Fracture Propagation Mechanism during Supercritical Carbon Dioxide Fracturing in Shale Reservoirs
AbstractTo investigate the fracture propagation mechanism during supercritical CO2 fracturing in shale reservoirs, a numerical model was proposed based on the displacement discontinuity method. The Peng–Robinson equation was introduced to determine the variations in CO2 properties du...
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| Language: | English |
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GeoScienceWorld
2022-11-01
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| Series: | Lithosphere |
| Online Access: | https://pubs.geoscienceworld.org/lithosphere/article/2022/1/3328162/618851/Numerical-Simulation-of-the-Fracture-Propagation |
| _version_ | 1797820223631392768 |
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| author | Fengxia Li Tong Zhou Haibo Wang Jianming He Aiping Shi |
| author_facet | Fengxia Li Tong Zhou Haibo Wang Jianming He Aiping Shi |
| author_sort | Fengxia Li |
| collection | DOAJ |
| description |
AbstractTo investigate the fracture propagation mechanism during supercritical CO2 fracturing in shale reservoirs, a numerical model was proposed based on the displacement discontinuity method. The Peng–Robinson equation was introduced to determine the variations in CO2 properties during the fracturing process. Considering natural fracture distribution in shale reservoirs, the fracture propagation mechanisms during supercritical CO2 fracturing in shale reservoirs under different horizontal stress differences and matrix permeabilities were analyzed. The influence of the proportion of CO2 preenergizing on fracture morphology was discussed. The results obtained via numerical simulation show that supercritical CO2 is beneficial to create a more complex fracture network by activating natural fractures under the same horizontal stress difference. CO2 easily penetrates into the matrix near the fracture surfaces, increasing reservoir energy. However, when the permeability of shale reservoirs exceeds 0.04×10−3 μm2, substantial filtration of CO2 into the reservoir matrix occurs near the well bore, limiting the activation of natural fractures around the fracture tip. A higher proportion of CO2 preenergizing during fracturing is conducive to improve the fracture complexity while reducing the fracture aperture. |
| first_indexed | 2024-03-13T09:35:16Z |
| format | Article |
| id | doaj.art-383dd68be8524467b04baf1e83b174a6 |
| institution | Directory Open Access Journal |
| issn | 1941-8264 1947-4253 |
| language | English |
| last_indexed | 2024-03-13T09:35:16Z |
| publishDate | 2022-11-01 |
| publisher | GeoScienceWorld |
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| series | Lithosphere |
| spelling | doaj.art-383dd68be8524467b04baf1e83b174a62023-05-25T14:35:08ZengGeoScienceWorldLithosphere1941-82641947-42532022-11-012022110.2113/2022/3328162Numerical Simulation of the Fracture Propagation Mechanism during Supercritical Carbon Dioxide Fracturing in Shale ReservoirsFengxia Li0Tong Zhou1http://orcid.org/0000-0002-3917-4476Haibo Wang2Jianming He3Aiping Shi41 State Key Laboratory of Shale Oil and Gas Enrichment Mechanisms and Effective Development Beijing 100083 China1 State Key Laboratory of Shale Oil and Gas Enrichment Mechanisms and Effective Development Beijing 100083 China1 State Key Laboratory of Shale Oil and Gas Enrichment Mechanisms and Effective Development Beijing 100083 China4 Institute of Geology and Geophysics Chinese Academy of Sciences Beijing 100191 China english.igg.cas.cn1 State Key Laboratory of Shale Oil and Gas Enrichment Mechanisms and Effective Development Beijing 100083 China AbstractTo investigate the fracture propagation mechanism during supercritical CO2 fracturing in shale reservoirs, a numerical model was proposed based on the displacement discontinuity method. The Peng–Robinson equation was introduced to determine the variations in CO2 properties during the fracturing process. Considering natural fracture distribution in shale reservoirs, the fracture propagation mechanisms during supercritical CO2 fracturing in shale reservoirs under different horizontal stress differences and matrix permeabilities were analyzed. The influence of the proportion of CO2 preenergizing on fracture morphology was discussed. The results obtained via numerical simulation show that supercritical CO2 is beneficial to create a more complex fracture network by activating natural fractures under the same horizontal stress difference. CO2 easily penetrates into the matrix near the fracture surfaces, increasing reservoir energy. However, when the permeability of shale reservoirs exceeds 0.04×10−3 μm2, substantial filtration of CO2 into the reservoir matrix occurs near the well bore, limiting the activation of natural fractures around the fracture tip. A higher proportion of CO2 preenergizing during fracturing is conducive to improve the fracture complexity while reducing the fracture aperture.https://pubs.geoscienceworld.org/lithosphere/article/2022/1/3328162/618851/Numerical-Simulation-of-the-Fracture-Propagation |
| spellingShingle | Fengxia Li Tong Zhou Haibo Wang Jianming He Aiping Shi Numerical Simulation of the Fracture Propagation Mechanism during Supercritical Carbon Dioxide Fracturing in Shale Reservoirs Lithosphere |
| title | Numerical Simulation of the Fracture Propagation Mechanism during Supercritical Carbon Dioxide Fracturing in Shale Reservoirs |
| title_full | Numerical Simulation of the Fracture Propagation Mechanism during Supercritical Carbon Dioxide Fracturing in Shale Reservoirs |
| title_fullStr | Numerical Simulation of the Fracture Propagation Mechanism during Supercritical Carbon Dioxide Fracturing in Shale Reservoirs |
| title_full_unstemmed | Numerical Simulation of the Fracture Propagation Mechanism during Supercritical Carbon Dioxide Fracturing in Shale Reservoirs |
| title_short | Numerical Simulation of the Fracture Propagation Mechanism during Supercritical Carbon Dioxide Fracturing in Shale Reservoirs |
| title_sort | numerical simulation of the fracture propagation mechanism during supercritical carbon dioxide fracturing in shale reservoirs |
| url | https://pubs.geoscienceworld.org/lithosphere/article/2022/1/3328162/618851/Numerical-Simulation-of-the-Fracture-Propagation |
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