摘要
SAGD开发油砂过程中,储层内存在的高含水层极大影响了正常的蒸汽腔扩展特征和开发动态。采用三维物理模拟实验,开展了高含水层油砂SAGD的汽腔扩展动态及开发特征研究。首先基于Forchheimer定律约束,提出了相似理论设计中三维模型渗透率的校正方法,进而通过相似模型设计,开展了均质及高含水层油砂SAGD的三维物理模拟实验,对比分析了高含水层油砂SAGD的汽腔扩展模式,表征了高含水层对油砂SAGD生产动态的影响。其次,基于该物理模型参数,建立了实验室尺度的数值模拟模型,通过数值反演,分析了高含水层厚度及含水饱和度的影响。最后,提出了优质储层体积比和汽腔横向扩展比两个评价指标。在此基础上,评价分析了高含水层对SAGD开发的负面效应,建立了高含水层油砂SAGD开发的界限图版。结果显示,高含水层的存在会导致SAGD汽腔前缘的温度突降,汽腔体积缩小。相比均质油砂储层,高含水层油砂SAGD的汽腔发育包括上升期、水体影响期、二次上升期、横向扩展期及衰竭期5个阶段。高含水层厚度和含水饱和度对油砂SAGD的开发动态具有一定负面影响,所建立的SAGD界限图版可用于有效评价高含水层对油砂SAGD开发效果的影响。
During the development of oilsands by steam assisted gravity drainage(SAGD)process,the high water-bearing layers in reservoirs have a great influence on the normal steam chamber expansion characteristics and recovery performance.A study of the steam chamber expansion behavior and development characteristics of oilsands reservoirs with high water-bearing layer via SAGD process was carried out using three-dimensional physical simulation experiments.Firstly,based on the constraint of Forchheimer’s law,this paper proposes a correction method for the permeability of the 3D model in the similar theoretical design,and then performs the 3D physical simulation experiments of SAGD on oilsands in homogeneous and high water-bearing oilsands reservoirs by means of similar model design,compares and analyzes the patterns of steam chamber expansion during the SAGD development of oilsands in high water-bearing reservoirs and characterizes the influence of high water-bearing layer on the recovery performance in oilsands SAGD process.Secondly,based on the parameters of this physical model,this paper establishes a laboratory-scale numerical simulation model,and the effects of the thickness and water saturation of the high water-bearing layer are analyzed by numerical inversion.Finally,the paper puts forwards two evaluation indexes,i.e.,high-quality reservoir volume ratio and steam chamber lateral expansion ratio.On this basis,the negative influence of high water-bearing layer on SAGD performance have been evaluated and analyzed,and a limitation chart for SAGD development of high water-bearing oilsands reservoirs has been established.The results show that the existence of high water-bearing layer leads to a sudden drop in temperature and a decrease in steam chamber volume at the front edge of SAGD steam chamber.Compared with homogeneous oilsands reservoirs,the expansion of steam chamber in high water-bearing oil-sands reservoirs includes five stages:rising period,influence period of water zone,secondary rising period,lateral expans
作者
东晓虎
王剑
刘慧卿
田冀
张琪琛
郑强
卢川
Dong Xiaohu;Wang Jian;Liu Huiqing;Tian Ji;Zhang Qichen;Zheng Qiang;Lu Chuan(State Key Laboratory of Petroleum Resources and Prospecting,China University of Petroleum,Beijing 102249,China;CNOOC Research Institute Co.,Ltd.,Beijing 100028,China)
出处
《石油学报》
EI
CAS
CSCD
北大核心
2022年第5期658-667,718,共11页
Acta Petrolei Sinica
基金
国家科技重大专项(2016ZX05031-003-004)
国家自然科学基金项目(No.U20B6003,No.52004303)资助。
关键词
油砂
蒸汽辅助重力泄油
相似比例模型
蒸汽腔
高含水层
oilsands
steam-assisted gravity drainage
scaled model
steam chamber
high water-bearing layer
