摘要
为明确姬塬油田超低渗油藏CO_(2)驱替及碳埋存机制,通过开展长岩心实验,对比分析气水不同组合驱替方式对提高采收率和CO_(2)埋存效果的影响。实验结果表明:水驱后CO_(2)与水交替驱采收率最高,其次为CO_(2)与水交替驱,而连续CO_(2)驱采收率最低,CO_(2)突破是影响采收率的关键因素,交替注入可以抑制气窜;油藏中CO_(2)埋存位置以大孔隙为主,气水交替驱比纯气驱更有利于小孔隙中CO_(2)埋存,埋存率从高到低依次为连续CO_(2)驱、CO_(2)与水交替驱、水驱后CO_(2)与水交替驱及水驱后CO_(2)驱。
In order to determine CO_(2) flooding and storage mechanisms in the ultra-low permeability reservoir in Jiyuan oilfield,long core ex-periments were performed to understand the performance of enhanced oil recovery(EOR)and CO_(2) storage under different flooding tech-niques.The results show that the CO_(2)-water alternating injection after water flooding yields the highest recovery factor,followed by CO_(2)-wa-ter alternating flooding,while continuous CO_(2) injection exhibits the lowest recovery factor.CO_(2) breakthrough is a crucial factor influencing recovery factor,and alternating injection can suppress gas channeling.CO_(2) is dominantly stored in the large pores of the reservoir,and the CO_(2)-water alternating flooding is more conducive to CO_(2) storage in the small pores than pure CO_(2) flooding.Continuous CO_(2) injection,CO_(2)-water alternating flooding,CO_(2)-water alternating injection after water flooding,and CO_(2) injection after water flooding exhibit a descending order in CO_(2) storage efficiency.
作者
陈小东
王进
宋鹏
刘建
杨卫国
张宝娟
CHEN Xiaodong;WANG Jin;SONG Peng;LIU Jian;YANG Weiguo;ZHANG Baojuan(Research Institute of Exploration and Development,Changqing Oilfield Company,PetroChina,Xi’an,Shaanxi 710018,China)
出处
《新疆石油地质》
CAS
CSCD
北大核心
2023年第5期592-597,共6页
Xinjiang Petroleum Geology
基金
国家科技重大专项(2017ZX05013004)。
