海上低渗油藏CO_(2)混相驱可行性实验研究  

Experimental study on feasibility of CO_(2) miscible flooding in offshore low permeability reservoirs

作　　者：刘浩洋 赵军[1] 郑继龙[1] 吴彬彬[1] 左清泉[1] 胡雪[1] 吴清辉[1] LIU Haoyang;ZHAO Jun;ZHENG Jilong;WU Binbin;ZUO Qingquan;HU Xue;WU Qinghui(CNOOC Energy Technology&Services Limited,Tianjin 300452,China)

机构地区：[1]中海油能源发展股份有限公司,天津300452

出　　处：《非常规油气》2024年第2期74-79,共6页Unconventional Oil & Gas

基　　金：中海石油(中国)有限公司深圳分公司科技项目“陆丰13-8油田特低渗储层开发可行性评价”(CCL2022SZPS0076)。

摘　　要：海上珠江口盆地陆丰凹陷低渗、特低渗储量丰富,水驱开发难度大,注气开发需求迫切。CO_(2)驱是提高采收率的主要技术之一,但目前海上CO_(2)综合利用方面应用较少。以陆丰凹陷L油藏为例,开展了目标油藏原油注CO_(2)驱油机理实验和长岩心CO_(2)驱油效果评价实验,重点对比CO_(2)注入前后原油相态特征的变化,并对不同开发方式驱油效果进行了对比优化研究,为目标油田CO_(2)驱可行性提供依据。实验结果表明,CO_(2)可以有效提高低渗油藏的开发效果,提高采收率幅度可以在水驱的基础上提高11.75%,交替驱可以作为后期注CO_(2)防窜和进一步提高采收率的技术手段。实验研究结果对海上低渗油藏CO_(2)注气开发提供技术支持。Lufeng Sag in the offshore Pearl River Mouth Basin is rich in low-permeability and ultra-low permeability reserves.It is difficult to develop by water flooding,and the demand for gas injection development is urgent.CO_(2) flooding is one of the main technologies to enhance oil recovery.However,there is little application in the comprehensive utilization of offshore CO_(2).Taking L oil reservoir in Lufeng Sag as an example,this paper conducts the CO_(2) flooding mechanism experiment with crude oil from the target reservoir and the CO_(2) flooding effect evaluation experiment with a long core.This paper focuses on analyzing the changes in crude oil phase characteristics before and after CO_(2) injection and researching the flooding effect of different development methods to provide a basis for the feasibility of CO_(2) flooding in target oil fields.The experimental results show that CO_(2) flooding can effectively improve the development effect of low permeability reservoirs,the enhanced oil recovery could be increased by 11.75%compared with water flooding,and water alternating gas flooding can be used as a technical means for later CO_(2) flooding to prevent channeling and further enhance oil recovery.The experimental research results provide technical support for CO_(2) injection development of offshore low permeability reservoirs.

关 键 词：CO_(2) 低渗油藏 提高采收率 注采参数 水气交替 

分 类 号：TE357.45[石油与天然气工程—油气田开发工程]