利用化学助剂强化CO_(2)埋存实验设计  

Experimental design for enhancing CO_(2) storage using chemical additives

作　　者：王文东[1] 王程伟 任慈 孙庆豪 苏玉亮[1] 李蕾[1] WANG Wendong;WANG Chengwei;REN Ci;SUN Qinghao;SU Yuliang;LI Lei(Key Laboratory of Unconventional Oil&Gas Development,Ministry of Education,School of Petroleum Engineering,China University of Petroleum(East China),Qingdao 266580,China;Shanghai Branch of CNOOC(China)Co.,Ltd.,Shanghai 200030,China)

机构地区：[1]中国石油大学(华东)石油工程学院非常规油气开发教育部重点实验室,山东青岛266580 [2]中海石油(中国)有限公司上海分公司,上海200030

出　　处：《实验技术与管理》2024年第1期130-135,共6页Experimental Technology and Management

基　　金：山东省研究生教育质量提升计划项目(SDYKC21026);山东省本科教学改革项目(Z2021015,M2022284);山东省研究生教学改革项目(SDYJG21017);中国石油大学(华东)教学改革重点项目(CZ2022004)。

摘　　要：结合储层CO_(2)埋存技术,自主搭建了地层温度压力条件下CO_(2)埋存实验装置,开展了多介质辅助CO_(2)埋存实验研究。研究结果表明,乙醇-KOH体系能够有效进行CO_(2)矿化埋存,其中96%乙醇+3 g KOH 500 mL溶液捕集CO_(2)能力最强,是最佳的CO_(2)矿化埋存溶液配比。经CO_(2)矿化埋存后,低渗透岩心孔隙度平均降低7.07%,孔隙度变化率与孔隙度呈正相关关系,渗透率平均降低16.01%。因此,96%乙醇+3 g KOH能够加速CO_(2)在储层中的CO_(2)沉淀过程,缩短CO_(2)在储层中的矿化埋存时间。该研究可重复性、准确性和可扩展性较强,能够激发学生自主设计实验的积极性及创新意识,培养学生的独立思考能力,有利于学生将理论知识与实际工程问题相结合,实现科研能力与创新能力的相互促进。[Objective]Carbon dioxide(CO_(2))displacement and storage are the most viable technologies for achieving carbon neutralization and enhancing low-permeability reservoir recovery.The current research focused on the evaluation of CO_(2) storage capacity and mechanism under different geological conditions but ignored the problem of CO_(2) storage time being too long.When CO_(2) was injected into the stratum for geological burial,it mainly existed in the form of geological structure burial in the initial stage of injection(within several decades),and the safety was relatively low.In the middle stage of injection(within 100 years),it changed from geological structure burial to bound storage and gradually to dissolved storage,and the safety was relatively good at this time.In the later stage of injection(thousands of years),the storage forms were mainly dissolved storage and mineralized storage,and the safety was the highest.Therefore,through laboratory experiments,studying how to improve CO_(2) mineralization and storage speed and shorten the CO_(2) storage time using chemical agents is of great significance.[Methods]Based on the actual CO_(2) storage technology in reservoirs,a CO_(2) storage experimental device under formation temperature and pressure conditions was independently built,and multimedia-assisted CO_(2) storage experimental research was conducted.The precipitation of potassium carbonate through the utilization of the ethanol+KOH solution system enabled CO_(2) capture and carbonization.The reaction process in the solution system was affected by the ethanol concentration,resulting in different CO_(2) carbonization amounts with the change in the ethanol concentration.Simultaneously,the precipitation-generated potassium-based acid salt could undergo a reaction with water to facilitate ethanol regeneration.This paper utilized experimental methods to investigate the CO_(2) capture efficiency of the ethanol+KOH system,real-time monitoring of ethanol content in the solution,and identification of the optimal ethan

关 键 词：低渗透油藏 乙醇+KOH+CO_(2) CO_(2)埋存 矿化埋存 创新性实验 

分 类 号：TE327[石油与天然气工程—油气田开发工程]