X区块低渗油藏CO_(2)混相驱影响因素分析  

Influencing Factors of CO_(2) Miscible Flooding in Low Permeability Reservoirs in Block X

作　　者：郭红强 杜敏 夏晨丹 黄宝杰 王嘉歌 GUO Hong-qiang;DU Min;XIA Chen-dan;Huang Bao-jie;WANG Jia-ge(Exploration and Development Technology Research Center,Shaanxi Yanchang Oilfield Co.,Ltd.,Yan’an 716000,Shaanxi,China)

机构地区：[1]陕西延长油田股份有限公司勘探开发技术研究中心,陕西延安716000

出　　处：《承德石油高等专科学校学报》2024年第4期39-44,共6页Journal of Chengde Petroleum College

基　　金：延长油田股份有限公司自主科技项目(提高采收率技术研究与试验):ycsy2022xjs-C-03。

摘　　要：为研究X区块低渗油藏注CO_(2)混相驱的影响因素,通过开展室内实验分析注入气CO_(2)与地层流体的最小混相压力,分析接触时间、渗透率、非均质性、杂质气体对CO_(2)混相驱油的影响,为X区块低渗油藏注CO_(2)提供理论依据。实验主要得到以下结论:通过细管实验测定得到该区块的最小混相压力为17 MPa。接触时间、渗透率和杂质气体会影响CO_(2)混相驱的效果,CO_(2)与地层流体的接触时间越长,CO_(2)与地层原油的混相效果越好。低渗油藏中CO_(2)混相驱的效果优于中高渗油藏。非均质性对混相的影响较小。CO_(2)混相压力随N_(2)及CH_(4)的摩尔分数的增大而升高,随C_(2)及C_(4)摩尔分数的增加而降低,注入气CO_(2)的纯度应该在95%以上,以上分析为目标区块后续注CO_(2)混相驱油提供了理论依据。In order to study the influencing factors of CO_(2) miscible flooding in low-permeability res-ervoirs in Block X,this paper conducts laboratory experiments to analyze the minimum miscible pressure of injected gas CO_(2) and formation fluid,and analyzes the contact time,permeability,heter-ogeneity,and impurity gas on CO_(2).The influence of miscible flooding provides a theoretical basis for CO_(2) injection in low-permeability reservoirs in Block X.The main conclusion of the experiment are as follows:the minimum miscible pressure of this block is 17 MPa determined by the thin tube ex-periment.The contact time,permeability and impurity gas will affect the effect of CO_(2) miscible flooding.The longer the contact time of CO_(2) and formation fluid is,the better the miscibility effect of CO_(2) and formation crude oil becomes.The effect of CO_(2) miscible flooding in low permeability reser-voirs is better than that in medium and high permeability reservoirs.Heterogeneity has less effect on miscibility.The CO_(2) miscible pressure increases with the increase of the mole fraction of N2 and CH_(4),and decreases with the increase of the mole fraction of C2 and C4.The purity of the injected gas CO_(2) should be above 95%.The above analysis provides a theoretical basis for subsequent CO_(2) injection miscible flooding in the target block.

关 键 词：CO_(2) 混相驱 影响因素 最小混相压力 

分 类 号：TE357[石油与天然气工程—油气田开发工程]