Influence of reservoir heterogeneity on immiscible water-alternating-CO_(2)flooding:A case study  

作　　者：Peifeng Jia Chuanzhi Cui Zhongwei Wu Dawei Yan 

机构地区：[1]National Key Laboratory of Deep Oil and Gas,China University of Petroleum(East China),Qingdao,Shandong,266580,China [2]Key Laboratory of Unconventional Oil&Gas Development(China University of Petroleum(East China)),Ministry of Education,Qingdao,Shandong,266580,China [3]Petroleum Engineering Institute of Shengli Oilfield Company,Dongying,Shandong,257015,China [4]School of Petroleum Engineering,Yangtze University,Wuhan,Hubei,430100,China [5]Hubei Key Laboratory of Drilling and Production Engineering for Oil and Gas,Yangtze University,Wuhan,Hubei,430100,China [6]China United Coalbed Methane Corporation Ltd.Taiyuan,Shanxi,030000,China

出　　处：《Energy Geoscience》2024年第3期77-84,共8页能源地球科学（英文）

基　　金：funded by the National Natural Science Foundation of China(No.51974343);the Open Fund of Hubei Key Laboratory of Drilling and Production Engineering for Oil and Gas(Yangtze University)(No.YQZC202307);the Qingdao Postdoctoral Applied Research Project(No.qdyy20200084);the China Postdoctoral Science Foundation(No.2021M703588);a project of Science&Technology R&D Department of SINOPEC entitled Key Technology for Optimization Design of 3D Development of Shale oil in Dongying Sag(No.P23026).

摘　　要：Currently,limited studies of immiscible water-alternating-CO_(2)(imWACO_(2))flooding focus on the impact of reservoir heterogeneity on reservoir development outcomes.Given this,using the heterogeneous reservoirs in the Gao 89-1 block as a case study,this study conducted slab core flooding experiments and numerical simulations to assess the impact of reservoir heterogeneity on imWACO_(2)flooding efficiency.It can be concluded that imWACO_(2)flooding can enhance the sweep volume and oil recovery compared to continuous CO_(2)flooding.As the permeability difference increases,the difference in the swept volume between zones/layers with relatively high and low permeability increases.To optimize the exploitation of reservoirs in the Gao 89-1 block,the optimal timing and CO_(2)injection rate for imWACO_(2)flooding are determined at water cut of 40%and 10000 m^(3)/d,respectively.A short injection-production semi-period,combined with multiple cycles of water and CO_(2)injection alternations,is beneficial for enhanced oil recovery from imWACO_(2)flooding.

关 键 词：Immiscible water-alternating-CO_(2)flooding Gao 89-1 block Slab experiment Numerical simulation Reservoir heterogeneity 

分 类 号：TE357[石油与天然气工程—油气田开发工程]