Clogging mechanism in the process of reinjection of used geothermal water: A simulation research on Xianyang No.2 reinjection well in a super-deep and porous geothermal reservoir

MA Zhi-yuan; XU Yong; ZHAI Mei-jing; WU Min

Volume 5 Issue 4

Dec. 2017

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Article Navigation > Journal of Groundwater Science and Engineering > 2017 > 5(4): 311-325

MA Zhi-yuan, XU Yong, ZHAI Mei-jing, et al. 2017: Clogging mechanism in the process of reinjection of used geothermal water: A simulation research on Xianyang No.2 reinjection well in a super-deep and porous geothermal reservoir. Journal of Groundwater Science and Engineering, 5(4): 311-325.

Citation:

MA Zhi-yuan, XU Yong, ZHAI Mei-jing, et al. 2017: Clogging mechanism in the process of reinjection of used geothermal water: A simulation research on Xianyang No.2 reinjection well in a super-deep and porous geothermal reservoir. Journal of Groundwater Science and Engineering, 5(4): 311-325.

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Clogging mechanism in the process of reinjection of used geothermal water: A simulation research on Xianyang No.2 reinjection well in a super-deep and porous geothermal reservoir

1School of Environmental Science and Engineering, Chang’an University, Xi’an 710054, China.2Key Laboratory of Subsurface Hydrology and Ecological Effects in Arid Region of the Ministry of Education, Chang’an University, Xi’an 710054, China.

Publish Date: 2017-12-28

Abstract

Abstract

In the process of geothermal exploitation and utilization, the reinjection amount of used geothermal water in super-deep and porous reservoir is small and significantly decreases over time. This has been a worldwide problem, which greatly restricts the exploitation and utilization of geothermal resources. Based on a large amount of experiments and researches, the reinjection research on the tail water of Xianyang No. 2 well, which is carried out by combining the application of hydrogeochemical simulation, clogging mechanism research and the reinjection experiment, has achieved breakthrough results. The clogging mechanism and indoor simulation experiment results show: Factors affecting the tail water reinjection of Xianyang No. 2 well mainly include chemical clogging, suspended solids clogging, gas clogging, microbial clogging and composite clogging, yet the effect of particle migration on clogging has not been found; in the process of reinjection, chemical clogging was mainly caused by carbonates (mainly calcite), silicates (mainly chalcedony), and a small amount of iron minerals, and the clogging aggravated when the temperature rose; suspended solids clogging also aggravated when the temperature rose, which showed that particles formed by chemical reaction had a certain proportion in suspended solids.
- Xianyang,
- Super-deep and porous geothermal reservoir,
- Reinjection,
- Clogging mechanism

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References(12)

References

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