基于井筒—油藏耦合模拟的SAGD开发规律分析  

Analysis of SAGD Development Law Based on Wellbore-reservoir Coupling Simulation

作　　者：张洪 Zhang Hong(Karamay Chengtou Oil Placer Exploration Co.,Ltd.,Karamay Xinjiang 834000)

机构地区：[1]克拉玛依市城投油砂矿勘探有限责任公司,新疆克拉玛依834000

出　　处：《中外能源》2022年第5期66-70,共5页Sino-Global Energy

摘　　要：SAGD开发中井筒及油藏耦合关系较为复杂,常规热采源汇井模型无法模拟SAGD水平井井筒内的流体流动,影响SAGD开发生产规律认识。因此,结合水平井井筒模拟方法,综合考虑井筒管流、井壁入流、油藏渗流等因素的相互影响,采用CMG软件建立水平井井筒变质量管流流动模型与均质油藏渗流耦合模型。数值模拟计算10年生产结果与开发区同类油藏实际开发动态参数对比显示,所建模型参数合理,可用来分析开发规律。在此基础上,深入认识SAGD开发过程中的温度场、压力场、注采剖面变化、生产动态变化特征,并开展了单管注汽、双管注汽、有无尾管的不同井筒结构下的SAGD开发效果对比。研究表明:受水平段压差分布影响,SAGD初期蒸汽腔主要在跟端发育,其他位置上升较慢,多点注汽可有效改善趾端蒸汽腔发育程度,使井筒沿程注采更均匀;水平段下入尾管可以有效改善井筒跟端蒸汽腔发育均匀程度,提高趾端蒸汽腔波及体积;对于均质油藏,三点注汽和两点注汽开发效果差别不大。The coupling relationship between wellbore and reservoir in SAGD development is complex. The conventional thermal recovery source sink well model cannot simulate the fluid flow in the wellbore of SAGD horizontal well,which affects the understanding of the development and production law of SAGD.Therefore,combined with the horizontal well wellbore simulation method and comprehensively considering the interaction of wellbore pipe flow,wellbore inflow and reservoir flow,a coupling model of variable mass pipe flow for horizontal well wellbore and homogeneous reservoir flow is established by CMG software.The comparison be-tween the 10-year production results of numerical simulation and the actual dynamic development parameters of similar reservoirs in the development area shows that the parameters of the model are reasonable and can be used to analyze the development pattern.On this basis,the characteristics of temperature field,pressure field,injection production profile change and production performance change in the process of SAGD develop-ment are deeply understood,and the development effects of SAGD under different wellbore structures of single pipe steam injection,double pipe steam injection and tailpipe or no tailpipes are compared.The research shows that affected by the pressure difference distribution in the horizontal section,the steam cavity is mainly developed at the heel end at the initial stage of SAGD,and it rises slowly at other positions.Multi-point steam injection can effectively improve the development degree of steam cavity at the toe end and make the injection and production more uniform along the wellbore;tailpipe run into horizontal section can effectively improve the development uniformity of the steam cavity at the heel end of the wellbore and improve the swept volume of the steam cavity at the toe end;for the homogeneous reservoirs,there are few differences between the development results of three-point steam injection and two-point steam injection.

关 键 词：水平段压差 双水平井SAGD 井筒管流 井筒—油藏耦合 多点注汽 尾管 

分 类 号：TE345[石油与天然气工程—油气田开发工程]