双水平井蒸汽辅助重力泄油恒温电预热数学模型与指标预测  

A mathematical model and relevant index prediction for constant-temperature electric heating of dual-horizontal-well SAGD start-up

作　　者：柳潇雄 蒋有伟[1,2] 吴永彬[1,2] 王家禄[2] LIU Xiaoxiong;JIANG Youwei;WU Yongbin;WANG Jialu(State Key Laboratory of Enhanced Oil Recovery,Beijing 100083,China;Research Institute of Petroleum Exploration&Development,PetroChina,Beijing 100083,China)

机构地区：[1]提高石油采收率国家重点实验室,北京100083 [2]中国石油勘探开发研究院,北京100083

出　　处：《石油勘探与开发》2018年第5期839-846,共8页Petroleum Exploration and Development

基　　金：中国石油勘探开发研究院超前研究项目"稠油高能电磁/电阻加热开采技术研究"(2015YJ-07)

摘　　要：建立了恒温控制模式下双水平井蒸汽辅助重力泄油(SAGD)油层电预热数学模型,并采用拉普拉斯变换和Stehfest数值反演对模型进行求解,同时选取双水平井SAGD开发区块典型井组,运用数值模拟方法验证了模型的准确性与可靠性。基于叠加原理,求解了地层中多井工作时的地温分布与能耗参数,建立了电加热相对于蒸汽加热的累计节能、节水和节省燃料当量的计算方法。通过对影响预热效果的主要参数进行敏感性分析,证实预热效果对加热温度最为敏感,呈非线性负相关特征;预热效果与孔隙度正线性相关,与井筒半径、含油饱和度负线性相关。采用新模型可实现地温分布、能耗参数、节能节水、节省燃料等关键指标的预测,同时结合油层预热达标温度,可以预测恒温模式预热所需的时间和能耗。Through Laplace transform and Stehfest numerical inversion,this research established a mathematical model for constant temperature electric heating of dual-horizontal-well steam-assisted gravity drainage(SAGD)start-up.To verify the model,a finite element simulation based on a typical SAGD block was completed,which proved the excellent agreement between the model solution and simulation results.Moreover,by means of superposition principle,underground temperature distribution and energy-related parameters during the multiwell operation were obtained,as well as a computational method targeted at quantifying the conserved energy,water and fuel of electric heating against steam heating.A parametric sensitivity analysis of electric heating was undertaken,which proved that the start-up effect is most sensitive to heating temperature,featuring a nonlinear negative correlation.Additionally,start-up effect is positively linear-correlative to porosity,and negatively linear-correlative to wellbore radius and oil saturation.The proposed model can be employed to predict key indexes such as underground temperature distribution,energy-consumption parameters,and accumulated conserved amounts of energy,water and fuel versus steam heating.Under a specified terminal temperature,temporal and energy quantities required by the start-up can also be determined.

关 键 词：双水平井 蒸汽辅助重力泄油 恒温电加热 地温分布 能耗 节能 节水 节省燃料 

分 类 号：TE341[石油与天然气工程—油气田开发工程]