基于可视化试验的普通稠油油藏N_(2)降黏泡沫驱油特征  

Characteristics of N_(2)viscous-reducing foam flooding in ordinary heavy oil reservoirs based on visualization experiments

作　　者：张梦园 李宾飞 曾祥晖[3] 付显威 辛岩[1,2] 李兆敏 ZHANG Mengyuan;LI Binfei;ZENG Xianghui;FU Xianwei;XIN Yan;LI Zhaomin(State Key Laboratory of Deep Oil and Gas,China University of Petroleum(East China),Qingdao 266580,China;School of Petroleum Engineering,China University of Petroleum(East China),Qingdao 266580,China;South China Sea East Petroleum Research Institute,Shenzhen Branch,CNOOC(China)Company Limited,Shenzhen 518000,China;Petroleum Development Center,SINOPEC Shengli Oilfield Company,Dongying 257060,China)

机构地区：[1]深层油气全国重点实验室(中国石油大学(华东)),山东青岛266580 [2]中国石油大学(华东)石油工程学院,山东青岛266580 [3]中海石油(中国)有限公司深圳分公司南海东部石油研究院,广东深圳518000 [4]中国石油化工股份有限公司胜利油田分公司石油开发中心,山东东营257060

出　　处：《中国石油大学学报(自然科学版)》2025年第2期175-182,共8页Journal of China University of Petroleum(Edition of Natural Science)

基　　金：国家自然科学基金项目(51574264)。

摘　　要：N_(2)降黏泡沫驱是普通稠油油藏开发中后期提高采收率的可靠手段,但围绕其驱油特征和影响规律的可视化试验研究有限。采用微观刻蚀模型和二维可视化平板模型分别开展可视化试验,探究N_(2)降黏泡沫微观驱油特征和原油动用机制,分析气液比和注入方式的影响。结果表明:N_(2)降黏泡沫驱显著改善N_(2)驱后期气窜现象,有效增加气体驻留时间,扩大波及并提高驱油效率;N_(2)降黏泡沫通过乳化分散、降黏和剥离作用提高洗油效率,通过与乳状油滴联合调堵作用扩大波及系数;气液比为3∶1时,波及系数和驱油效率最高;气液同注时,N_(2)降黏泡沫预生成且可在地层中大量稳定存在,利于发挥乳化降黏和封堵调驱的优势,波及系数和驱油效率明显高于气体前置、气体后置和气液交替的注入方式。N_(2)viscous-reducing foam flooding is a proven technique for enhancing oil recovery during mid to late stages of development in ordinary heavy oil reservoirs,but there are few studies on its oil displacement mechanisms using pore-scale visualization experiments.In this study,visualization experiments were carried out using microscopic etching model and 2D visualization plate model respectively.The microscopic oil displacement characteristics and oil mobilization mechanisms in N_(2)viscous-reducing foam flooding were investigated,and the impacts of gas-liquid ratio and injection method were examined.The results indicate that N_(2)viscous-reducing foam flooding can significantly reduce gas channeling during the late stage of N_(2)flooding,effectively increase gas residence time,expand sweep area and improve oil displacement efficiency.N_(2)viscous-reducing foam can improve oil displacement efficiency mainly by emulsifying dispersion,reducing viscosity and stripping,and expanding sweep coefficient by combining with emulsion oil droplets for plugging.The sweep coefficient and oil displacement efficiency tend to the highest when the gas-liquid ratio is set at 3∶1.When gas and liquid are co-injected,N_(2)viscous-reducing foam can be pre-formed in wellbore and is stable in the rock formation,which is conducive to emulsified viscosity reducing and plugging.The sweep coefficient and oil displacement efficiency of the gas-liquid co-injection method are significantly higher than those of gas injection alone and alternative gas-liquid injection methods.

关 键 词：普通稠油 N_(2)降黏泡沫驱 可视化试验 原油动用机制 波及系数 驱油效率 

分 类 号：TE357.4[石油与天然气工程—油气田开发工程]