Propagation Characteristics of Fractures Induced by Supercritical Carbon Dioxide Jet in Hard and Soft Layered Rocks
The initiation and propagation behavior of fractures induced by supercritical carbon dioxide (SC-CO<sub>2</sub>) jet fracturing is significant to evaluate stimulated reservoir volume (SRV). However, the propagation characteristics of fractures induced by SC-CO<sub>2</sub> jet...
| Main Authors: | , , |
|---|---|
| Format: | Article |
| Language: | English |
| Published: |
MDPI AG
2022-09-01
|
| Series: | Applied Sciences |
| Subjects: | |
| Online Access: | https://www.mdpi.com/2076-3417/12/18/9013 |
| _version_ | 1797491550062641152 |
|---|---|
| author | Feng Liu Yi Hu Jiawei Liu |
| author_facet | Feng Liu Yi Hu Jiawei Liu |
| author_sort | Feng Liu |
| collection | DOAJ |
| description | The initiation and propagation behavior of fractures induced by supercritical carbon dioxide (SC-CO<sub>2</sub>) jet fracturing is significant to evaluate stimulated reservoir volume (SRV). However, the propagation characteristics of fractures induced by SC-CO<sub>2</sub> jet in layered rocks with layers having different mechanical properties have not yet been studied. In this study, four groups of artificial sandstones were used to conduct SC-CO<sub>2</sub> jet fracturing experiments and investigate the fracture initiation and propagation behavior in hard and soft layered rocks. A strain collection device was employed to monitor the strain changes of the specimens during the experiments, and after the experiments, a three-dimensional scanner was used to obtain the morphologies of the main fractures. Experimental results showed that the SC-CO<sub>2</sub> jet fracturing can be divided into the pressurization of the perforation pressure stage and fracture propagation stage, and the fractures initiation and propagation is intermittent. Three types of main fractures have been found—longitudinal fracture, transverse fracture and oblique fracture—and the formation mechanism of the main fractures has been elaborated. The rock strength can affect the number and complexity of fractures created and the fracturing rate, and the Young’s modulus of rock has an effect on fracture propagation length. The fractures mainly develop near the perforation and are difficult to propagate to another layer with different mechanical properties. The result in our study is conducive to the application of SC-CO<sub>2</sub> jet fracturing technology in the field. |
| first_indexed | 2024-03-10T00:50:54Z |
| format | Article |
| id | doaj.art-602fed111302427083ce33065c335130 |
| institution | Directory Open Access Journal |
| issn | 2076-3417 |
| language | English |
| last_indexed | 2024-03-10T00:50:54Z |
| publishDate | 2022-09-01 |
| publisher | MDPI AG |
| record_format | Article |
| series | Applied Sciences |
| spelling | doaj.art-602fed111302427083ce33065c3351302023-11-23T14:51:48ZengMDPI AGApplied Sciences2076-34172022-09-011218901310.3390/app12189013Propagation Characteristics of Fractures Induced by Supercritical Carbon Dioxide Jet in Hard and Soft Layered RocksFeng Liu0Yi Hu1Jiawei Liu2Hubei Key Laboratory of Waterjet Theory and New Technology, Wuhan University, Wuhan 430072, ChinaHubei Key Laboratory of Waterjet Theory and New Technology, Wuhan University, Wuhan 430072, ChinaCNPC Jianghan Machinery Research Institute Co., LTD., Wuhan 430024, ChinaThe initiation and propagation behavior of fractures induced by supercritical carbon dioxide (SC-CO<sub>2</sub>) jet fracturing is significant to evaluate stimulated reservoir volume (SRV). However, the propagation characteristics of fractures induced by SC-CO<sub>2</sub> jet in layered rocks with layers having different mechanical properties have not yet been studied. In this study, four groups of artificial sandstones were used to conduct SC-CO<sub>2</sub> jet fracturing experiments and investigate the fracture initiation and propagation behavior in hard and soft layered rocks. A strain collection device was employed to monitor the strain changes of the specimens during the experiments, and after the experiments, a three-dimensional scanner was used to obtain the morphologies of the main fractures. Experimental results showed that the SC-CO<sub>2</sub> jet fracturing can be divided into the pressurization of the perforation pressure stage and fracture propagation stage, and the fractures initiation and propagation is intermittent. Three types of main fractures have been found—longitudinal fracture, transverse fracture and oblique fracture—and the formation mechanism of the main fractures has been elaborated. The rock strength can affect the number and complexity of fractures created and the fracturing rate, and the Young’s modulus of rock has an effect on fracture propagation length. The fractures mainly develop near the perforation and are difficult to propagate to another layer with different mechanical properties. The result in our study is conducive to the application of SC-CO<sub>2</sub> jet fracturing technology in the field.https://www.mdpi.com/2076-3417/12/18/9013fracture propagationSC-CO<sub>2</sub> jet fracturinghard and soft layered rockstrain monitoringthree-dimensional scanning |
| spellingShingle | Feng Liu Yi Hu Jiawei Liu Propagation Characteristics of Fractures Induced by Supercritical Carbon Dioxide Jet in Hard and Soft Layered Rocks Applied Sciences fracture propagation SC-CO<sub>2</sub> jet fracturing hard and soft layered rock strain monitoring three-dimensional scanning |
| title | Propagation Characteristics of Fractures Induced by Supercritical Carbon Dioxide Jet in Hard and Soft Layered Rocks |
| title_full | Propagation Characteristics of Fractures Induced by Supercritical Carbon Dioxide Jet in Hard and Soft Layered Rocks |
| title_fullStr | Propagation Characteristics of Fractures Induced by Supercritical Carbon Dioxide Jet in Hard and Soft Layered Rocks |
| title_full_unstemmed | Propagation Characteristics of Fractures Induced by Supercritical Carbon Dioxide Jet in Hard and Soft Layered Rocks |
| title_short | Propagation Characteristics of Fractures Induced by Supercritical Carbon Dioxide Jet in Hard and Soft Layered Rocks |
| title_sort | propagation characteristics of fractures induced by supercritical carbon dioxide jet in hard and soft layered rocks |
| topic | fracture propagation SC-CO<sub>2</sub> jet fracturing hard and soft layered rock strain monitoring three-dimensional scanning |
| url | https://www.mdpi.com/2076-3417/12/18/9013 |
| work_keys_str_mv | AT fengliu propagationcharacteristicsoffracturesinducedbysupercriticalcarbondioxidejetinhardandsoftlayeredrocks AT yihu propagationcharacteristicsoffracturesinducedbysupercriticalcarbondioxidejetinhardandsoftlayeredrocks AT jiaweiliu propagationcharacteristicsoffracturesinducedbysupercriticalcarbondioxidejetinhardandsoftlayeredrocks |