Experimental Study on the Effect of Supercritical CO2 on Mechanical Properties and Fracture Characteristics of Longmaxi Shale
Conventional hydraulic fracturing techniques typically consume large amounts of water when producing shale gas. Fracking fluids may cause environmental pollution. In contrast, supercritical carbon dioxide (scCO2) (above 31.8°C, 7.29 MPa) can displace CH4 in shale reservoirs. Achieve CO2 sequestratio...
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| Format: | Article |
| Language: | English |
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Wiley
2023-01-01
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| Series: | Advances in Materials Science and Engineering |
| Online Access: | http://dx.doi.org/10.1155/2023/4596586 |
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| author | Ran Zhang Hao Yan Lin Yang Kun Liao Lei Tao |
| author_facet | Ran Zhang Hao Yan Lin Yang Kun Liao Lei Tao |
| author_sort | Ran Zhang |
| collection | DOAJ |
| description | Conventional hydraulic fracturing techniques typically consume large amounts of water when producing shale gas. Fracking fluids may cause environmental pollution. In contrast, supercritical carbon dioxide (scCO2) (above 31.8°C, 7.29 MPa) can displace CH4 in shale reservoirs. Achieve CO2 sequestration while increasing the shale gas production. We studied the mechanical properties and fracture characteristics of a shale under the action of scCO2, nitrogen, helium, and water by comparing the triaxial compression tests of shale samples with seven coring angles. The results show that: (1) scCO2 effectively reduced compressive strength of the shale and weakened the anisotropy of shale; (2) scCO2 caused the content of dolomite, calcite, and illite to decrease by 4.7%∼13.5%, respectively; (3) scCO2 produced micropores and microfractures 10 times larger than the original size in the microstructure. These microstructures can help improve the seepage and gathering of shale gas, leading to enhanced shale gas recovery and CO2 storage. |
| format | Article |
| id | doaj-art-fa692bceb52045bbb68eb9fe37efaa36 |
| institution | Kabale University |
| issn | 1687-8442 |
| language | English |
| publishDate | 2023-01-01 |
| publisher | Wiley |
| record_format | Article |
| series | Advances in Materials Science and Engineering |
| spelling | doaj-art-fa692bceb52045bbb68eb9fe37efaa362025-02-03T06:04:46ZengWileyAdvances in Materials Science and Engineering1687-84422023-01-01202310.1155/2023/4596586Experimental Study on the Effect of Supercritical CO2 on Mechanical Properties and Fracture Characteristics of Longmaxi ShaleRan Zhang0Hao Yan1Lin Yang2Kun Liao3Lei Tao4School of Mechanical EngineeringSchool of Mechanical EngineeringTight Oil and Gas Exploration and Development Project Department of PetroChina Southwest Oil and Gasfield CompanySchool of Mechanical EngineeringChengdu University of TechnologyConventional hydraulic fracturing techniques typically consume large amounts of water when producing shale gas. Fracking fluids may cause environmental pollution. In contrast, supercritical carbon dioxide (scCO2) (above 31.8°C, 7.29 MPa) can displace CH4 in shale reservoirs. Achieve CO2 sequestration while increasing the shale gas production. We studied the mechanical properties and fracture characteristics of a shale under the action of scCO2, nitrogen, helium, and water by comparing the triaxial compression tests of shale samples with seven coring angles. The results show that: (1) scCO2 effectively reduced compressive strength of the shale and weakened the anisotropy of shale; (2) scCO2 caused the content of dolomite, calcite, and illite to decrease by 4.7%∼13.5%, respectively; (3) scCO2 produced micropores and microfractures 10 times larger than the original size in the microstructure. These microstructures can help improve the seepage and gathering of shale gas, leading to enhanced shale gas recovery and CO2 storage.http://dx.doi.org/10.1155/2023/4596586 |
| spellingShingle | Ran Zhang Hao Yan Lin Yang Kun Liao Lei Tao Experimental Study on the Effect of Supercritical CO2 on Mechanical Properties and Fracture Characteristics of Longmaxi Shale Advances in Materials Science and Engineering |
| title | Experimental Study on the Effect of Supercritical CO2 on Mechanical Properties and Fracture Characteristics of Longmaxi Shale |
| title_full | Experimental Study on the Effect of Supercritical CO2 on Mechanical Properties and Fracture Characteristics of Longmaxi Shale |
| title_fullStr | Experimental Study on the Effect of Supercritical CO2 on Mechanical Properties and Fracture Characteristics of Longmaxi Shale |
| title_full_unstemmed | Experimental Study on the Effect of Supercritical CO2 on Mechanical Properties and Fracture Characteristics of Longmaxi Shale |
| title_short | Experimental Study on the Effect of Supercritical CO2 on Mechanical Properties and Fracture Characteristics of Longmaxi Shale |
| title_sort | experimental study on the effect of supercritical co2 on mechanical properties and fracture characteristics of longmaxi shale |
| url | http://dx.doi.org/10.1155/2023/4596586 |
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