地热井口数据反演及高效利用  

INVERSION OF GEOTHERMAL WELLHEAD DATA AND EFFICIENT USE

作　　者：曹植纲 郑德温[2] 刘建武[1] 何力[1] 卢德唐[1] Cao Zhigang;Zheng Dewen;Liu Jianwu;He Li;Lu Detang(Oil and Gas Research Center of University of Science and Technology of China,Hefei 230022,China;Research Institute of Petroleum Exploration and Development,Beijing 100083,China)

机构地区：[1]中国科学技术大学石油天然气研究中心,合肥230022 [2]中国石油勘探开发研究院,北京100083

出　　处：《太阳能学报》2020年第8期7-14,共8页Acta Energiae Solaris Sinica

基　　金：中石油-中科院重大战略合作项目(2015A-4812);国家科技重大专项(2017ZX05009005-002)。

摘　　要：建立地热井地层及井筒热-流耦合方程,采用2阶中心有限差分进行求解,得到井底及井口之间压力及温度对应关系。针对地热井流量变化特征,利用井口折算到井底压力,提出分段线性积分反演方法,利用该方法获得地层流动参数。对井口温度采用温度历史拟合方法,反演从产层到地面段地热储层的平均热扩散系数。利用所提出的压力及温度反演方法,对某地热井进行分析,获得地层渗流及热力学参数,同时预测热量的变化及相关参数对井口温度影响,可为地热高效开发提供科学指导。In this paper,thermal-flow coupling equations of wellbore and reservoir of geothermal well are established.The equations are solved by the second-order central finite difference method.The relationships between bottom hole pressures/temperatures and wellhead pressures/temperatures are obtained.Considering the flow-rate changes of geothermal wells,an inversion method based on piecewise linear integration function is proposed to obtain the reservoir flow parameters by using bottom hole pressure converted from wellhead data.The temperature historical matching method is used to invert the average thermal diffusivity of the geothermal reservoir from production zone to ground.By using the pressure-temperature inversion method proposed in this paper,the data from a geothermal well are analyzed to obtain the seepage and thermodynamic parameters of the reservoir.In addition,the prediction of heat losses is made and the influence of relevant parameters on the wellhead temperature is studied to provide scientific guidance for the efficient geothermal development.

关 键 词：地热井 热流耦合 热量损失 压力分析 分段线性积分函数 

分 类 号：TK529[动力工程及工程热物理—热能工程]