Numerical Investigation on Wellbore Temperature Prediction during the CO 2 Fracturing in Horizontal Wells

Xinrun Lyu, Shicheng Zhang, Yueying He, Zihan Zhuo, Chong Zhang and Zhan Meng
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Xinrun Lyu: State Key Laboratory of Petroleum Resources and Engineering, China University of Petroleum, Beijing 102249, China
Shicheng Zhang: State Key Laboratory of Petroleum Resources and Engineering, China University of Petroleum, Beijing 102249, China
Yueying He: National Computer Network Emergency Response Technical Team/Coordination Center of China, Beijing 100029, China
Zihan Zhuo: National Computer Network Emergency Response Technical Team/Coordination Center of China, Beijing 100029, China
Chong Zhang: National Computer Network Emergency Response Technical Team/Coordination Center of China, Beijing 100029, China
Zhan Meng: State Key Laboratory of Oil and Gas Reservoir Geology and Exploitation, Southwest Petroleum University, Chengdu 610500, China

Sustainability, 2021, vol. 13, issue 10, 1-33

Abstract: A novel model is established to predict the temperature field in the horizontal wellbore during CO 2 fracturing. The pressure work and viscous dissipation are considered, and the transient energy, mass and momentum equations as well as the CO 2 physical properties are solved fully coupled. The model passes the convergence test and is verified through a comparison using the COMSOL software. Then, a sensitivity analysis is performed to study the effects of the treating parameters. Results illustrate that the relationship between the injection rate and the stable bottom-hole temperature (hereinafter referred to as BHT) is non-monotonic, which is different from the hydraulic fracturing. The existence of the horizontal section will increase the BHT at 2 m 3 /min condition but reduce the BHT at 10 m 3 /min condition. The problem of high wellbore friction can be alleviated through tube size enhancement, and the ultimate injection rate allowed increased from 2.7 m 3 /min to 29.6 m 3 /min when the tube diameter increased from 50.3 mm to 100.3 mm. Additionally, the open-hole completion method of the horizontal section can increase the BHT to 2.7 °C but reduce the near formation temperature to 24.5 °C compared with the casing completion method.

Keywords: CO 2; non-isothermal flow; fracturing; horizontal wellbore; heat transfer; numerical model (search for similar items in EconPapers)
JEL-codes: O13 Q Q0 Q2 Q3 Q5 Q56 (search for similar items in EconPapers)
Date: 2021
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