Model for calculating the temperature and pressure within the fracture during supercritical carbon dioxide fracturing |
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| Affiliation: | 1. State Key Laboratory of Oil and Gas Reservoir Geology and Exploitation, Southwest Petroleum University, Chengdu 610500, China;2. School of Computer Science, Southwest Petroleum University, Chengdu 610500, China;3. The Second Exploitation Factory of PetroChina HuaBei Oilfield Company, Bazhaou 065700, China;4. CNOOC Ener Tech-drilling & Production Co. Ltd, Tianjin 300452, China;1. State Key Laboratory of Coal Resources and Safe Mining, China University of Mining & Technology, Xuzhou, Jiangsu, 221116, China;2. School of Mines, China University of Mining & Technology, Xuzhou, Jiangsu, 221116, China;1. State Key Laboratory of Coal Resources and Safe Mining, China University of Mining and Technology, Beijing, 100083, China;2. School of Mechanical & Civil Engineering, China University of Mining and Technology, Beijing, 100083, China;3. State Key Laboratory for Geomechanics and Deep Underground Engineering, China University of Mining and Technology, Xuzhou, 221116, China;1. Department of Earth and Space Sciences, Southern University of Science and Technology, Shenzhen, 518055, Guangdong, China;2. China University of Petroleum (Beijing), Beijing, 102249, China;3. Xi''an Shiyou University, Xi''an, 710065, Shanxi, China;1. State Key Laboratory of Oil and Gas Reservoir Geology and Exploitation, Southwest Petroleum University, Xindu Avenue 8, Chengdu 610500, China;2. Down-Hole Operating Company, Chuanqing Drilling and Exploration Engineering Co., Ltd., Chengdu 610051, China |
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| Abstract: | Supercritical carbon dioxide fracturing not only enhances fossil hydrogen production better than hydraulic fracturing, but also alleviates water consumption and storages some carbon dioxide in reservoirs. In this study, a numerical simulation model for calculating the temperature and pressure within a fracture during supercritical carbon dioxide fracturing was established based on rock mechanics, fluid mechanics, thermodynamics, and heat transfer. Moreover, the effects of impact of in-situ stress of reservoir, reservoir temperature, carbon dioxide temperature at the bottom of the well and injection rate on temperature and pressure in the fracture are analyzed based on this new model. The results show that the temperature and pressure of carbon dioxide in the fracture are constantly changing during the fracturing, due to the propagation of the fracture, which makes the temperature and pressure in the fracture unable to reach a steady state. The effect of supercritical carbon dioxide fracturing in reservoirs with higher temperature and lower in-situ stress is better, and higher injection temperatures and smaller injection rates should be chosen in order for carbon dioxide to quickly reach the supercritical state. |
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| Keywords: | Supercritical carbon dioxide Temperature Pressure Mechanics Fossil hydrogen |
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