低渗透裂缝性油藏CO_(2)驱气窜形成机理及防治技术研究  

Study on formation mechanism and prevention technology of gas channeling by CO_(2) flooding in low permeability fractured reservoirs

作　　者：王石头[1,3] 马国伟 郎庆利 杨棠英[1,3] WANG Shitou;MA Guowei;LANG Qingli;YANG Tangying(Oil and Gas Technology Research Institute,Changqing Oilfield Company,CNPC,Xi’an 710018,China;No.3 Oil Production Plant,Changqing Oilfield Company,CNPC,Yinchuan 750000,China;National Engineering Laboratory of Low Permeablity Oil and Gas Field Exploratory and Development,Xi’an 710018,China)

机构地区：[1]中国石油长庆油田分公司油气工艺研究院,陕西西安710018 [2]中国石油长庆油田分公司第三采油厂,宁夏银川750000 [3]低渗透油气田勘探开发国家工程实验室,陕西西安710018

出　　处：《能源化工》2022年第3期29-34,共6页Energy Chemical Industry

基　　金：中国石油天然气股份有限公司科学研究与技术开发项目“长庆油田低渗透油藏CO_(2)驱油与埋存关键技术研究与应用”(2014E-36)、“二氧化碳规模化捕集、驱油与埋存全产业链关键技术研究及示范”(2021ZZ01)。

摘　　要：为进一步提高油藏采收率,开展了CO_(2)驱先导试验,试验结果表明:整体增油降水效果明显,但部分井见气,气窜现象严重,降低了CO_(2)驱增油效果。为了防治气窜,提高低渗裂缝性油藏CO_(2)驱波及效率,采用纳米凝胶颗粒进行调驱。采用数值模拟方法结合生产动态分析识别储层优势渗流通道,并通过室内试验确定了调驱剂注入后走向及位置、调驱剂质量分数对调驱效果的影响,研究结果表明:采用耐酸耐盐堵剂纳米凝胶颗粒的封堵效果较好,该结果对低渗裂缝性油藏注气驱方案设计具有指导意义。In order to further improve the oil recovery of the reservoirs,the CO_(2) flooding pilot test is carried out.The test results show that the overall effect of increasing oil and reducing water is obvious,but gas breakthrough is serious in some wells,which reduces the effect of CO_(2) flooding.In order to prevent gas channeling and improve the sweep efficiency of CO_(2) flooding in low permeability fractured reservoirs,nano gel particles are used for profile control and flooding.The numerical simulation method combined with the production performance analysis is used to identify the preferential percolation paths of the reservoirs.The influence of the injection direction and location of the profile control agent after injection and the mass fraction of the profile control agent is determined through the laboratory test.The research results show that the blocking effect of acid and salt resistant plugging agent nano gel particles is better,which have guiding significance for the design of gas injection and flooding scheme in low permeability fractured reservoirs.

关 键 词：低渗透油藏 优势渗流通道 CO_(2)驱 渗透率时变 

分 类 号：TE357.4[石油与天然气工程—油气田开发工程]