高含水油藏CO2驱油机理

doi:10.7623/syxb2016S1014

石油学报 ›› 2016, Vol. 37 ›› Issue (S1): 143-150.DOI: 10.7623/syxb2016S1014

• 油田开发 • 上一篇

高含水油藏CO₂驱油机理

周宇, 王锐, 苟斐斐, 郎东江

中国石油化工股份有限公司石油勘探开发研究院北京 100083

收稿日期:2016-02-02 修回日期:2016-09-11 出版日期:2016-10-31 发布日期:2016-11-30
通讯作者: 周宇,男,1984年3月生,2006年获中国石油大学(华东)学士学位,2011年获中国石油勘探开发研究院博士学位,现为中国石油化工股份有限公司石油勘探开发研究院油田开发研究所副主任师、高级工程师,主要从事油层物理研究工作。Email:zhouyu@live.com
作者简介:周宇,男,1984年3月生,2006年获中国石油大学(华东)学士学位,2011年获中国石油勘探开发研究院博士学位,现为中国石油化工股份有限公司石油勘探开发研究院油田开发研究所副主任师、高级工程师,主要从事油层物理研究工作。Email:zhouyu@live.com
基金资助:
中国石油化工股份有限公司科技部项目“濮城油田沙一段CO₂驱油与埋存机理及应用”资助。

CO₂ flooding mechanism in high water cut reservoirs

Zhou Yu, Wang Rui, Gou Feifei, Lang Dongjiang

Sinopec Petroleum Exploration and Production Research Institute, Beijing 100083, China

Received:2016-02-02 Revised:2016-09-11 Online:2016-10-31 Published:2016-11-30

摘要/Abstract

摘要：

CO₂驱油能够有效提高原油采收率，但在高含水油藏中，水能够溶解CO₂，并影响CO₂与原油接触，从而影响驱油效果。针对这一问题，开展了CO₂在油、水中的浓度分配实验，通过建立CO₂在油、水中扩散的数学模型，使用核磁共振研究CO₂驱替实验，探索了CO₂在高含水油藏中的溶解扩散机理以及对综合驱油效果的影响。结果表明，在高含水油藏中，CO₂在水中溶解损失的比例不高，同时CO₂能够快速渗透水膜，与被水屏蔽的剩余油接触，波及水驱未波及区域内的剩余油。由于水膜阻隔了原油与CO₂的直接接触，在CO₂驱替过程中会首先驱出水膜，使油、气直接接触，再驱出剩余油。其宏观表现为注气早期含水率较高、采油速度较低，当CO₂突破后，含水率急剧下降，采油速度升高。研究明确了高含水油藏CO₂驱油机理，解释了其见效特征，并为改善高含水油藏CO₂驱油效果提供了参考。

关键词: CO₂驱油, 高含水期, 溶解分配, CO₂扩散, 驱替实验

Abstract:

CO₂ flooding is able to effectively increase crude oil recovery rate. However, in high water cut oil reservoirs, water can dissolve CO₂ and hamper contact between CO₂ and crude oil, thereby influencing flooding effect. To address this issue, this study conducts a concentration partitioning test of CO₂ in oil and water, builds a mathematical model for diffusion of CO₂ in oil and water, and performs analyses on CO₂ flooding test by NMR, so as to the explore dissolution and diffusion mechanism of CO₂ in high water cut oil reservoir and its influences on overall flooding effect. The results indicate that in a high water cut oil reservoir, the percentage of CO₂ dissolution loss in water is not high, and CO₂ can penetrate water film quickly to contact the remaining oil shielded by water and affect the remaining oil in the area unaffected by water flooding. Since water film blocks direct contact between crude oil and CO₂, water film will be displaced first during CO₂ flooding so that oil comes in direct contact with gas, then the remaining oil will be displaced. This is macroscopically represented by high water cut and low oil recovery speed during the early gas injection, and sharply decreased water cut and increasing oil recovery speed after CO₂ broke through,. This study defines a CO₂ flooding mechanism for high water cut oil reservoirs, explains its effectiveness characteristics, and offers reference for improving the CO₂ flooding effect of high water cut oil reservoirs.

Key words: CO₂ flooding, high water cut stage, concentration distribution, CO₂ diffusion, flooding test

中图分类号:

TE357.45

周宇, 王锐, 苟斐斐, 郎东江. 高含水油藏CO₂驱油机理[J]. 石油学报, 2016, 37(S1): 143-150.

Zhou Yu, Wang Rui, Gou Feifei, Lang Dongjiang. CO₂ flooding mechanism in high water cut reservoirs[J]. Acta Petrolei Sinica, 2016, 37(S1): 143-150.

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高含水油藏CO₂驱油机理

CO₂ flooding mechanism in high water cut reservoirs

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