Hydro-geochemical simulation of the mixing balance of exploitation and reinjection of geothermal flu

• 作 者: LIU Qi JIANG Si-min PU Ye-feng ZHANG Wei
• 机 构: Department of Geotechnical Engineering, College of Civil Engineering, Tongji University,Department o
• 出 处: Journal of Groundwater Science and Engineering
• 发表日期: 2016年02期
• 关键词: exploitation geochemical lithology technological stratum mixing Tianjin proporti

This paper targets its research at the exploitation–reinjection well of geothermal fluid of one geothermal heating project in Tianjin, China, examines such factors as ground temperature, CO_2 partial pressure and stratum lithology, and simulates the changes in the main component contents of geothermal fluids mixed at different proportions in the exploitation and reinjection well. The research findings show that the mixed fluids are increasingly similar in nature to the reinjected water as the reinjection process goes on. It’s suggested that the manual method should be used to ensure the reinjected water has the similar mineralization as the exploited ground water in the process of reinjection and some acceptable adjustments should be made according to the specific component and water temperature. The study on water-rock balance calculation shows that PHREEQC can simulate the complicated chemical reactions related to water when the transfer of solute happens, so the necessary technological supports are given for the reasonable development and protection of geothermal resources.

This paper targets its research at the exploitation-reinjection well of geothermal fluid of one geothermal heating project in Tianjin, China, examines such factors as ground temperature, CO 2 partial pressure and stratum lithology, and simulates the changes in the main component contents of geothermal fluids mixed at different proportions in the exploitation and reinjection well. The research findings show that the mixing images are fractions similar in nature to the reinjected water as the reinjection process goes on. It’s suggested that the manual method should be used to ensure the reinjected water has the similar mineralization as the exploited ground water in the process of reinjection and some acceptable account should be made according to the specific component and water temperature. The study on water-rock balance calculation that that PHREEQC can simulate the complicated chemical reactions related to water when the transfer of solute happens, so the necessary technolo gical supports are given for the reasonable development and protection of geothermal resources.