Deep Carbonate Geohermal Reservoir Production Enhancement Technology in North China Plain
North China area is rich in geothermal resources.The newly discovered Gaoyuzhuang geothermal reservoir in the Jixian System has even greater potential for development and utilization.However,there are issues such as high fracture in homogeneity and low productivity in Gaoyuzhuang Formation.Two typical geothermal wells in the Gaoyuzhuang Formation of the North China plain were selected for experimental study and in-situ application of two reconstruction techniques,acid and sand fracturing.The efficiency is evaluated by analyzing the pressure curves at different stages.An integrated technical approach to geothermal reservoir evaluation-plan design-effect evaluation is presented.The water output increased from 4.72 m3/h to 44.10 m3/h after acid fracturing of the Gaoyuzhuang geothermal reservoir in Xiong'an New Area,and the unit water surge increased from 0.024 m3/h·m to 0.745 m3/h·m.The sand fracturing of the Gaoyuzhuang reservoir in the Cangxian uplift has doubled the unit gushing water from 3.009 m3/h·m to 6.158 m3/h·m.Both methods show significant productivity gains.
carbonate geothermal reservoirreservoir enhancement technologyacid fracturingsand fracturinghydrothermal in North China plainhydrogeology
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