Effects of phase-transition heat on fracture temperature in self-propping phase-transition fracturing technology
The thermal flux curve of phase-transition fluid (PF) was tested using differential scanning calorimetry, based on which a reaction kinetics model was established to reflect the relationship between phase transition conversion rate, temperature and time. A temperature field model for fractures and r...
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| Format: | Article |
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KeAi Communications Co., Ltd.
2024-12-01
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| Series: | Petroleum Exploration and Development |
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| Online Access: | http://www.sciencedirect.com/science/article/pii/S1876380425605623 |
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| author | Nanlin ZHANG Fushen LIU Liangliang JIANG Zhifeng LUO Yiwen JU Pingli LIU Liqiang ZHAO Yuxin PEI |
| author_facet | Nanlin ZHANG Fushen LIU Liangliang JIANG Zhifeng LUO Yiwen JU Pingli LIU Liqiang ZHAO Yuxin PEI |
| author_sort | Nanlin ZHANG |
| collection | DOAJ |
| description | The thermal flux curve of phase-transition fluid (PF) was tested using differential scanning calorimetry, based on which a reaction kinetics model was established to reflect the relationship between phase transition conversion rate, temperature and time. A temperature field model for fractures and rock matrix considering phase transition heat was then constructed, and its reliability was verified using previously established temperature field models. Additionally, the new model was used to study the effects of different injection parameters and phase-transition fracturing performance parameters on the temperature variations in fractures and matrix. The study indicates that, at different positions and times, the cooling effect of the injected cold fluid and the exothermic effect during the phase transition alternately dominate the temperature within the fracture. At the initial stage of fracturing fluid injection, the temperature within the fracture is high, and the phase transition rate is rapid, resulting in a significant impact of exothermic phase transition on the reservoir rock temperature. In the later stage of injection, the fracture temperature decreases, the phase transition exothermic rate slows, and the cooling effect of the fracturing fluid on the reservoir rock intensifies. Phase transition heat significantly affects the temperature of the fracture. Compared to cases where phase transition heat is not considered, when it is taken into account, the temperature within the fracture increases to varying degrees at the end of fluid injection. As the phase transition heat increases from 20 J/g to 60 J/g, the maximum temperature rise in the fracture increases from 2.1 °C to 6.2 °C. The phase transition heat and PF volume fraction are positively correlated with fracture temperature changes, while specific heat capacity is negatively correlated with temperature changes. With increasing injection time, the temperature and phase transition rate at the fracture opening gradually decrease, and the location of the maximum phase transition rate and temperature difference gradually shifts from the fracture opening to about 10 m from the opening. |
| format | Article |
| id | doaj-art-3504caa4dd3847b49efd652b0cf12ce1 |
| institution | DOAJ |
| issn | 1876-3804 |
| language | English |
| publishDate | 2024-12-01 |
| publisher | KeAi Communications Co., Ltd. |
| record_format | Article |
| series | Petroleum Exploration and Development |
| spelling | doaj-art-3504caa4dd3847b49efd652b0cf12ce12025-08-20T02:40:13ZengKeAi Communications Co., Ltd.Petroleum Exploration and Development1876-38042024-12-015161587159710.1016/S1876-3804(25)60562-3Effects of phase-transition heat on fracture temperature in self-propping phase-transition fracturing technologyNanlin ZHANG0Fushen LIU1Liangliang JIANG2Zhifeng LUO3Yiwen JU4Pingli LIU5Liqiang ZHAO6Yuxin PEI7Research Center of Coastal and Urban Geotechnical Engineering, Zhejiang University, Hangzhou 310058, China; National Key Laboratory of Oil and Gas Reservoir Geology and Exploitation, Southwest Petroleum University, Chengdu 610500, ChinaResearch Center of Coastal and Urban Geotechnical Engineering, Zhejiang University, Hangzhou 310058, China; Corresponding author.Department of Chemical and Petroleum Engineering, University of Calgary, Calgary T2N1N4, CanadaNational Key Laboratory of Oil and Gas Reservoir Geology and Exploitation, Southwest Petroleum University, Chengdu 610500, ChinaKey Laboratory of Computational Geodynamics, College of Earth and Planetary Sciences, University of Chinese Academy of Sciences, Beijing 100049, ChinaNational Key Laboratory of Oil and Gas Reservoir Geology and Exploitation, Southwest Petroleum University, Chengdu 610500, ChinaNational Key Laboratory of Oil and Gas Reservoir Geology and Exploitation, Southwest Petroleum University, Chengdu 610500, ChinaSchool of Petroleum and Natural Gas Engineering, Changzhou University, Changzhou 213164, ChinaThe thermal flux curve of phase-transition fluid (PF) was tested using differential scanning calorimetry, based on which a reaction kinetics model was established to reflect the relationship between phase transition conversion rate, temperature and time. A temperature field model for fractures and rock matrix considering phase transition heat was then constructed, and its reliability was verified using previously established temperature field models. Additionally, the new model was used to study the effects of different injection parameters and phase-transition fracturing performance parameters on the temperature variations in fractures and matrix. The study indicates that, at different positions and times, the cooling effect of the injected cold fluid and the exothermic effect during the phase transition alternately dominate the temperature within the fracture. At the initial stage of fracturing fluid injection, the temperature within the fracture is high, and the phase transition rate is rapid, resulting in a significant impact of exothermic phase transition on the reservoir rock temperature. In the later stage of injection, the fracture temperature decreases, the phase transition exothermic rate slows, and the cooling effect of the fracturing fluid on the reservoir rock intensifies. Phase transition heat significantly affects the temperature of the fracture. Compared to cases where phase transition heat is not considered, when it is taken into account, the temperature within the fracture increases to varying degrees at the end of fluid injection. As the phase transition heat increases from 20 J/g to 60 J/g, the maximum temperature rise in the fracture increases from 2.1 °C to 6.2 °C. The phase transition heat and PF volume fraction are positively correlated with fracture temperature changes, while specific heat capacity is negatively correlated with temperature changes. With increasing injection time, the temperature and phase transition rate at the fracture opening gradually decrease, and the location of the maximum phase transition rate and temperature difference gradually shifts from the fracture opening to about 10 m from the opening.http://www.sciencedirect.com/science/article/pii/S1876380425605623self-propping phase-transition fracturingin-situ self-generated proppantreaction kineticsphase-transition heatphase transition ratefracture temperature |
| spellingShingle | Nanlin ZHANG Fushen LIU Liangliang JIANG Zhifeng LUO Yiwen JU Pingli LIU Liqiang ZHAO Yuxin PEI Effects of phase-transition heat on fracture temperature in self-propping phase-transition fracturing technology Petroleum Exploration and Development self-propping phase-transition fracturing in-situ self-generated proppant reaction kinetics phase-transition heat phase transition rate fracture temperature |
| title | Effects of phase-transition heat on fracture temperature in self-propping phase-transition fracturing technology |
| title_full | Effects of phase-transition heat on fracture temperature in self-propping phase-transition fracturing technology |
| title_fullStr | Effects of phase-transition heat on fracture temperature in self-propping phase-transition fracturing technology |
| title_full_unstemmed | Effects of phase-transition heat on fracture temperature in self-propping phase-transition fracturing technology |
| title_short | Effects of phase-transition heat on fracture temperature in self-propping phase-transition fracturing technology |
| title_sort | effects of phase transition heat on fracture temperature in self propping phase transition fracturing technology |
| topic | self-propping phase-transition fracturing in-situ self-generated proppant reaction kinetics phase-transition heat phase transition rate fracture temperature |
| url | http://www.sciencedirect.com/science/article/pii/S1876380425605623 |
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