Importance of conformance control in reinforcing synergy of CO_(2) EOR and sequestration  

作　　者：Yang Zhao Zhen-Hua Rui Zheng Zhang Si-Wei Chen Ren-Feng Yang Kai Du Birol Dindoruk Tao Yang Erling H.Stenby Malcolm A.Wilson 

机构地区：[1]State Key Laboratory of Petroleum Resources and Prospecting,China University of Petroleum(Beijing),Beijing 102249,China [2]College of Petroleum Engineering,China University of Petroleum(Beijing),Beijing 102249,China [3]College of Carbon Neutrality Future Technology,China University of Petroleum(Beijing),Beijing 102249,China [4]College of Petroleum,China University of Petroleum(Beijing)at Karamay,Karamay,Xinjiang 83400,China [5]CNOOC Research Institute Co.,Ltd.,Beijing 100029,China [6]University of Houston,USA [7]Equinor,Ovre Stokkavei,Stavanger,Norway [8]Technical University of Denmark,Denmark [9]University of Regina,Canada

出　　处：《Petroleum Science》2022年第6期3088-3106,共19页石油科学（英文版）

基　　金：supported by Science Foundation of China University of Petroleum,Beijing(No.2462022BJRC001,2462021YJRC012);the funding from State Key Laboratory of Petroleum Resources and Prospecting(No.PRP/indep-1-2103)

摘　　要：Injecting CO2into hydrocarbon reservoirs can enhance the recovery of hydrocarbon resources,and simultaneously,CO2can be stored in the rese rvoirs,reducing considerable amount of carbon emissions in the atmosphere.However,injected CO_(2)tends to go through fractures,high-permeability channels and streaks present in reservoirs,resulting in inefficient hydrocarbon recovery coupled with low CO_(2)storage performance.Conformance treatments with CO_(2)-resistant crosslinked polymer gels were performed in this study to mitigate the CO_(2)channeling issue and promote the synergy between enhanced oil recovery(EOR) and subsurface sequestration of CO_(2).Based on a typical low-permeability CO_(2)-flooding reservoir in China,studies were performed to investigate the EOR and CO_(2)storage performance with and without conformance treatment.The effect of permeability contrast between the channels and rese rvoir matrices,treatment size,and plugging strength on the efficiency of oil recovery and CO_(2)storage was systematically investigated.The results indicated that after conformance treatments,the CO_(2)channeling problem was mitigated during CO_(2)flooding and storage.The injected CO_(2)was more effectively utilized to recover the hydrocarbons,and entered wider spectrum of pore spaces.Consequently,more CO_(2)was trapped underground.Pronounced factors on the synergy of EOR and CO_(2)storage were figured out.Compared with the treatment size,the CO_(2)storage efficiency was more sensitive to the plugging strength of the conformance treatment materials.This observation was important for conformance treatment design in CCUS-EOR projects.According to this study,the materials should reduce the channel permeability to make the channel/matrix permeability ratio below 30.The results demonstrate the importance of conformance treatment in maximizing the performance of CCUS-EOR process to achieve both oil recovery improvement and efficient carbon storage.This study provides guidelines for successful field applications of CO_(2)transport co

关 键 词：Enhanced oil recovery(EOR) CO_(2)geological sequestration Conformance control Gel treatment CCUS Low-permeability reservoir 

分 类 号：TE357.7[石油与天然气工程—油气田开发工程]