摘要
中深层U形地热井供暖工艺模式逐渐成为地热界供暖新的方向。以鄂尔多斯盆地南缘黄陵地区为研究对象,系统分析了研究区中深层地质条件与热储层特征,分析得出研究区地温梯度为3.05℃/100m,属于地温异常地区;其中埋深3155m的马家沟组具有低渗透率、低孔隙度、无流体或含极少量流体等地质特征,其热储资源总量为3.72×10^(20) J,为良好的热传导型热储层和理想的干热岩类型地热资源层;通过注水换热循环试验、理论分析与同类型已建供暖项目对比研究,得出影响中深层U形地热井出口水温的因素有:入口温度、注水流量(流速)、水平段长度、井深、井眼直径(换热接触面积)、出水井的保温措施等;为有效提高换热效率,以中深层U形地热井裸眼换热工艺为依据,采用注水换热循环方法预测得出运行时水量采取100m^(3)/h,换热量可达3128.47kW,单位每延米换热量为427.21W/m。研究成果对鄂尔多斯盆地南缘黄陵地区中深层地热能开发具有重要的借鉴意义。
The medium deep U-shaped geothermal well heating process mode has been gradually become a geothermal domain new heating orientation.Taking the Huangling area in Ordos Basin south margin as a subject investigated,systematically analyzed medium deep geological condition and geothermal reservoir features,the analyzed study area geothermal gradient is 3.05℃/100m,thus belongs to geothermal abnormal place.In which,Majiagou Formation strata with buried depth 3155m have low permeability,low porosity,without or with only tiny amount of fluid etc geological features.Total geothermal resources have 3.72×10^(20) J,thus a good thermal conduction type geothermal reservoir and ideal hot dry rock type geothermal resource layer.Through water injection heat transfer cycle test,theoretical analysis and same type built heating projects contrastive study have worked out that medium deep U-shaped geothermal well outlet water temperature impacting factors have inlet temperature,water injection flow(velocity),horizontal segment length,well total depth,well diameter(heat transfer contact area)and wet well insulation measures etc.To promote heat transfer efficiency effectively,taking medium deep U-shaped geothermal well barefoot interval heat transfer technique as the basis,through water injection heat transfer cycle method predicted operational water flow is 100m^(3)/h,heat transfer capacity can be 3128.47kW as high,per linear meter heat transfer capacity 427.21W/m.The research findings have important reference significance for medium deep geothermal energy exploitation in Ordos Basin south margin Huangling area.
作者
王少锋
申小龙
赵真
刘军
罗娜宁
Wang Shaofeng;Shen Xiaolong;Zhao Zhen;Liu Jun;Luo Naning(Shaanxi Coal Geology Investigation Research Institute Co.Ltd.,Xi’an Shaanxi 710021;Ministry of Natural Resources Key Laboratory of Coal Exploration and Comprehensive Utilization,Xi’an,Shaanxi 710021)
出处
《中国煤炭地质》
2022年第6期40-45,72,共7页
Coal Geology of China
关键词
鄂尔多斯盆地南缘
中深层U形地热井
地温梯度
地热资源量
注水换热试验
Ordos Basin south margin
medium deep U-shaped geothermal well
geothermal gradient
geothermal resources
water injection heat transfer testing