水平井注蒸汽非稳态传热与流动分析  

Process analysis of unsteady heat transfer and fluid flow during steam injection via horizontal wells

作　　者：郭春生[1,2] 徐明海 薛世峰 曲芳仪[2] 

机构地区：[1]中国石油大学储运与建筑工程学院,山东青岛266580 [2]山东大学(威海)机电与信息工程学院,山东威海264209

出　　处：《中国石油大学学报（自然科学版）》2016年第4期116-120,共5页Journal of China University of Petroleum(Edition of Natural Science)

基　　金：国家自然科学基金项目(51305238);山东省自然科学基金项目(ZR2015PE016)

摘　　要：水平井注汽采油在稠油开采过程中得到广泛的应用,建立热采注汽过程中水平井井筒-储层耦合的非稳态传热与渗流模型,利用数值方法研究注蒸汽阶段的油、水、汽在井筒和油藏中三相非稳态流动与传热规律,分析井筒内积存原油对蒸汽推进的影响;同时计算分析湿蒸汽参数沿水平井段变化特点。研究结果表明:新建模型揭示了井筒内蒸汽前沿推进机制;在注汽速度8 t/h、注汽干度0.7时,注汽5 d后井筒内积存原油被驱替;受井筒内蒸汽流量变化和井筒与油藏热交换影响,湿蒸汽比焓(或干度)从水平井跟端到趾端下降较快;随着注汽速度和注汽干度的增大水平井吸汽段长度增加。Steam injection via horizontal wells has been widely used for heavy oil recovery. In this study,numerical simulationmodels of heat transfer and fluid flow in wellbore in coupling with reseryoir flows during the process of steam injection ina horizontal well were established,in which the unsteady flow and heat transfer of multi-phase（i. e. steam,water and oil） inreservoir and wellbore were considered. The influence of oil accumulation in wellbore on the migration and diffusion processof steam and water was analyzed, and the variations of the flow and thermal parameters of wet steam along the horizontal wellwere calculated. The simulation results of a case study indicate that the proposed horizontal well steam injection model caneffectively simulate the moving steam front in the wellbore, and the accumulated oil stockpile can be flooded out from thewellbore after 5 days of steam injection with injection rate of 8 t/h and steam dryness of 7 0 % . During the injection process,the enthalpy of the injected wet steam decreases rapidly from the heel to the toe of the horizontal well. Increasing steam injectionrate and its dryness can increase the heat transfer to the oil formation along the horizontal well.

关 键 词：稠油 水平井 注蒸汽 数值模拟 积存原油 

分 类 号：TE345[石油与天然气工程—油气田开发工程]