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DOI	10.3389/feart.2023.1019328
	Modeling of two-phase flow of high temperature geothermal production wells in the Yangbajing geothermal field, Tibet
	Lei, Hongwu; Xie, Yingchun; Li, Jin; Hou, Xuewen
发表日期	2023
EISSN	2296-6463
卷号	11
英文摘要	Two-phase flow (flow of water in both liquid and gas phase, containing a non-condensable gas such as CO2) in the wellbore is one of the most important processes in the production performance and wellbore scaling evaluations of high temperature geothermal wells. This paper first describes the discharge tests in the Yangbajing geothermal field, Tibet. Next, a simple model for governing the two-phase flow in the presence of CO2 in the wellbore is constructed and a robust calculation method is presented. The model is applied to three production wells in the Yangbajing geothermal field. The results show that the velocity difference between the gas and liquid phase should be included in the model. Ignoring this difference (i.e., homogeneous model) would result in a significant deviation between measurements and calculations. A drift flux model (DFM) describes the velocity difference, where the specifics of the particular model can have significant effects on the results for the pressure and temperature profiles in the wellbore. Three commonly used DFMs are compared to estimate their performance. The calculated wellhead pressure and temperature are in the range of 2,3 bar and 125 degrees C-135 degrees C for all three wells at a production rate of about 20 kg/s. The estimated wellhead gas mass fraction is between 3% and 8%. Considering CO2 content, three different scenarios were evaluated, although the effect on the pressure and temperature profiles were limited. However, CO2 content has a much more significant effect on the flash depth, which is an important parameter for the estimation of calcite scaling.
关键词	geothermal two-phase flow carbon dioxide numerical simulation Yangbajing geothermal field
英文关键词	RESERVOIRS; CHINA; RESOURCES; FRACTION; WELLBORE; SYSTEMS
WOS研究方向	Geosciences, Multidisciplinary
WOS记录号	WOS:000951890500001
来源期刊	FRONTIERS IN EARTH SCIENCE
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/283200
作者单位	Chinese Academy of Sciences; Wuhan Institute of Rock & Soil Mechanics, CAS
推荐引用方式 GB/T 7714	Lei, Hongwu,Xie, Yingchun,Li, Jin,et al. Modeling of two-phase flow of high temperature geothermal production wells in the Yangbajing geothermal field, Tibet[J],2023,11.
APA	Lei, Hongwu,Xie, Yingchun,Li, Jin,&Hou, Xuewen.(2023).Modeling of two-phase flow of high temperature geothermal production wells in the Yangbajing geothermal field, Tibet.FRONTIERS IN EARTH SCIENCE,11.
MLA	Lei, Hongwu,et al."Modeling of two-phase flow of high temperature geothermal production wells in the Yangbajing geothermal field, Tibet".FRONTIERS IN EARTH SCIENCE 11(2023).