Geothermal Re-injection Test In Xi’an City

Currently geothermal water exploitation in Xi’an is increasing year by year, It deed to rapidly decline of geothermal water table and the drop funnel rapidly depleted. Geothermal reinjection can solve the problem of environmental pollution caused by the discharged geothermal water,Meanwhile it can add the pressure to the geothermal reservoir,protect the geothermal resources,so that geothermal water will be used sustainability. Thus,There are Economic and practical significance by Reinject the geothermal water in the Xi’ an city.This article combine the features of Xi’ an geothermal and we do the experiment in the Xi’ an XG and XC neighborhood. We find the main reason of the bad geothermal reinjection effect by reaserch of isotope tracer technique, compatibility of geothermal water, Bacterial test and encrustment of geothermal water.The results indicate that geothermal water in the Xi’ an XG’s compatibility is the best,and it is most beneficial to geothermal reinjection.But geothermal water in XC neighborhood’s compatibility is the well,So that the same horizon geothermal water’s compatibility is best,they scale less,and more conducive to geothermal reinjection.we monitoring the temperature and water quality of the two well,and find that its have little change.Meanwhile we do the trace experiment first in Xi’ an XG,Tracing agent appears about42days after we reinject the tracing agent, and it reached to the peak about52days,so we can say that geothermal reservoir is connected and the tracer in the underground movement at0.19m/h.Compared the suspended solid material particle size. Pore structure, Compatibility analysis and analysis of bacterial of the four geothermal reinjection tests.we found that the main reason of the geothermal reinjection blocktiong in Xi’an is the suspended solids, meanwhile,Chemical precipitate clogging geothermal reservoir,Because it is not compatible with the geothermal water.The bacteria and air bubbles will affect the recharge efficiency.