高温地热生产井碳酸钙结垢定量评价：两相流动——以西藏羊八井为例

雷宏武; 白冰; 崔银祥; 谢迎春; 李进; 侯学文

doi:10.3799/dqkx.2022.164

Volume 48 Issue 3

Mar. 2023

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Lei Hongwu, Bai Bing, Cui Yinxiang, Xie Yingchun, Li Jin, Hou Xuewen, 2023. Quantitative Assessment of Calcite Scaling of a High Temperature Geothermal Production Well: Two-Phase Flow—Application to the Yangbajing Geothermal Fields, Tibet. Earth Science, 48(3): 923-934. doi: 10.3799/dqkx.2022.164

Citation:

Lei Hongwu, Bai Bing, Cui Yinxiang, Xie Yingchun, Li Jin, Hou Xuewen, 2023. Quantitative Assessment of Calcite Scaling of a High Temperature Geothermal Production Well: Two-Phase Flow—Application to the Yangbajing Geothermal Fields, Tibet. Earth Science, 48(3): 923-934. doi: 10.3799/dqkx.2022.164

Citation:

Lei Hongwu, Bai Bing, Cui Yinxiang, Xie Yingchun, Li Jin, Hou Xuewen, 2023. Quantitative Assessment of Calcite Scaling of a High Temperature Geothermal Production Well: Two-Phase Flow—Application to the Yangbajing Geothermal Fields, Tibet. Earth Science, 48(3): 923-934. doi: 10.3799/dqkx.2022.164

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Quantitative Assessment of Calcite Scaling of a High Temperature Geothermal Production Well: Two-Phase Flow—Application to the Yangbajing Geothermal Fields, Tibet

doi: 10.3799/dqkx.2022.164

Lei Hongwu^{1
,
,},
Bai Bing¹,
Cui Yinxiang¹,
Xie Yingchun^{2
,
,
,},
Li Jin³,
Hou Xuewen³

1.
State Key Laboratory of Geomechanics and Geotechnical Engineering, Institute of Rock and Soil Mechanics, Chinese Academy of Sciences, Wuhan 430071, China
2.
CNNP Kunhua Energy Development Co. Ltd., Hangzhou 310000, China
3.
No.280 Research Institute of Nuclear Industry, Guanghan 618300, China

Received Date: 2022-04-05
Available Online: 2023-03-27
Publish Date: 2023-03-25

Abstract

Abstract

The quantitative evaluation of calcite scaling in high temperature geothermal production wells involves complex physical and chemical processes, in which the two-phase flow in the wellbore is the basis for the evaluation. Based on mass, energy and momentum conservations, this paper firstly constructs a model for governing the two-phase steady flow with phase transition in the presence of CO₂ in the wellbore. A robust calculation method is presented and the calculation is validated. Then the temperature and pressure measurements in a typical geothermal well were carried out during discharge tests including static and dynamic test in the Yangbajing geothermal field, Tibet. Combined with the discharge test, the model is successfully used to evaluate the two-phase flow process in a high temperature production well. The results show that the velocity difference between the gas and liquid phase has a decisive impact on the profiles of temperature and pressure in the wellbore. If the velocity difference is not considered in the model, the calculations will deviate far from the measurements. At the production rate of 19.10 kg/s, the calculated wellhead temperature and pressure are about 128 ℃ and 2.6 bar, respectively. The wellhead gas mass fraction is between 6% and 7%, and the corresponding gas phase saturation is about 0.84. The CO₂ mass fractions in both gas and liquid phases change sharply about 20-30 m up from the flash point, indicating that serious calcite scaling will occur in this well section.
- geothermal energy,
- two-phase flow,
- CO₂,
- numerical simulation,
- Yangbajing,
- hydrogeology

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References(35)

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Quantitative Assessment of Calcite Scaling of a High Temperature Geothermal Production Well: Two-Phase Flow—Application to the Yangbajing Geothermal Fields, Tibet

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