不同参数下特低渗透油藏CO2驱油效果实验研究  

Experimental Study on Effects of CO2 Flooding in Ultra-low Permeability Reservoir under Different Parameters

作　　者：高明星 倪军 王仙仙 马彬 王红娟 GAO Mingxing;NI Jun;WANG Xianxian;MA Bin;WANG Hongjuan(Research Institute,Shaanxi Yanchang Petroleum(Group)Co.,Ltd.,Xi'an,Shaanxi 710065,China)

机构地区：[1]陕西延长石油(集团)有限责任公司研究院,陕西西安710065

出　　处：《西安石油大学学报（自然科学版）》2020年第3期60-65,共6页Journal of Xi’an Shiyou University（Natural Science Edition）

基　　金：国家重点研发计划“CO2驱油技术及地质封存安全监测”(2018YFB0605500)。

摘　　要：为了确定储层物性、注入方式、注采参数等开发参数对特低渗透油藏CO2驱油效果的影响规律,开展了不同渗透率、不同注气压差、水/CO2气体交替注入方式以及油藏非均质性条件下的CO2驱替实验。实验结果表明,CO2驱最终采收率随着岩心渗透率、注气压差的增大而增大,水/CO2气体交替注入方式较CO2连续注入的最终采收率要高出近10%,而储层的非均质性越强则越不利于特低渗透油藏的CO2驱,裂缝性油藏更易于发生气窜导致最终采收率极低。In order to determine the influence laws of development parameters such as reservoir physical property,injection mode and injection and production parameters on CO2 flooding effect in ultra-low permeability reservoirs,the CO2 displacement experiments under different reservoir permeability,injection pressure difference,water/CO2displacement mode and reservoir heterogeneity were carried out.The results show that the ultimate recovery factor increases with the increase of core permeability and injection pressure difference,and the ultimate recovery factor of water/CO2 alternating injection mode is nearly 10%higher than that of CO2 continuous injection mode.The stronger the reservoir heterogeneity,the more unfavorable the development of ultra-low permeability reservoirs.Fractured reservoirs are more prone to gas channeling leading to the ultimate recovery factor very low.

关 键 词：特低渗透油藏 CO2驱油 水气交替注入 注入压力 储层非均质性 

分 类 号：TE357.45[石油与天然气工程—油气田开发工程]