CO_(2)-EOR过程中油藏储层构造封存能力的模拟  

Simulation of reservoir structural storage capacity in CO_(2)-EOR process

作　　者：王璐[1] 刘森 姬泽敏[1] 廉黎明[1] 田茂章[1] 宋文枫 岳孝昆 房红旭 鲁效庆 WANG Lu;LIU Sen;JI Zemin;LIAN Liming;TIAN Maozhang;SONG Wenfeng;YUE Xiaokun;FANG Hongxu;LU Xiaoqing(Research Institute of Petroleum Exploration&Development,PetroChina,Beijing 100083,China;School of Materials Science and Engineering,China University of Petroleum(East China),Shandong Qingdao 266580,China)

机构地区：[1]中国石油勘探开发研究院,北京100083 [2]中国石油大学(华东)材料科学与工程学院,山东青岛266580

出　　处：《非常规油气》2024年第2期99-107,共9页Unconventional Oil & Gas

基　　金：中国石油直属院所基础研究和战略储备技术研究基金项目“储层结构及多介质相互作用对CO_(2)埋存的影响规律研究”(2019D-500805(JT));提高石油采收率国家重点实验室开放课题“微纳尺度油藏中气体驱替原油增采的微观机制研究”(2022-KFKT-28);中国石油天然气股份有限公司重大科技专项“CCUS驱油地质体精细描述及油藏工程关键技术研究”(2021ZZ01-05)。

摘　　要：为应对日益严峻的能源危机和温室效应,CO_(2)提高采收率技术脱颖而出,因此CO_(2)提高采收率后的地质封存安全性和相应的封存能力评估引起了广泛关注。借助数值模拟方法,基于吉林油田某区块油藏的实际储层条件,构建了注入CO_(2)含量为10%~90%的9个模型,分别探究了含水饱和度为30%,50%和90%以及储层压力为10 MPa,20 MPa和30 MPa时油藏各相组分的分布规律;基于前人对封存CO_(2)安全储存状态划分的研究,最终明确了CO_(2)的安全封存量。结果表明:1)当含水饱和度(30%)和压力(10 MPa)一定时,增加CO_(2)含量(10%~90%)可大幅提高CO_(2)的有效封存体积分数(26%~93%);2)压力的提升(10~30 MPa)促进了CO_(2)在油相中的溶解,从而略微降低了储层的封存能力(18%~7%);3)含水饱和度对储层封存CO_(2)的能力的影响微乎其微。该研究旨在阐明不同条件下CO_(2)的构造埋存量,为相关研究提供借鉴。To cope with the increasingly severe energy crisis and greenhouse effect,CO_(2)-enhanced oil recovery(CO_(2)-EOR)technology stands out,and the safety of the geological storage and corresponding storage capacity evaluation after enhanced oil recovery with CO_(2)have attracted widespread attention.Herein,nine models with the injection of CO_(2)content ranging from 10%to 90%were constructed based on the reservoir conditions in Jilin oilfield through numerical simulation.The distribution rules of various phase components in the reservoir were investigated under conditions of water saturation of 30%,50%,and 90%and reservoir pressures of 10 MPa,20 MPa,and 30 MPa.The safe storage capacity of CO_(2)was finally clarified based on the previous work on the division of the safe storage state of buried CO_(2).The results showed that:1)When water saturation(30%)and pressure(10 MPa)are constant,the increase of CO_(2)content(10%~90%)can significantly improve the effective storage volume fraction of CO_(2)(26%~93%);2)The rise of pressure(10~30 MPa)promotes the dissolution of CO_(2)in the oil phase,which slightly reduces the storage capacity of the reservoir(18%~7%);3)The impact of water saturation on the storage capacity of CO_(2)in the reservoir is negligible.This study aims to clarify the CO_(2)geological storage capacity under different conditions,which can provide a reference for related research.

关 键 词：CO_(2)封存 封存能力评估 含水饱和度 储层压力 CO_(2)含量 数值模拟 

分 类 号：P618.13[天文地球—矿床学] TE54[天文地球—地质学]