延长油田低渗透油藏提高采收率技术进展  

Technical advancements in enhanced oil recovery in low permeability reservoirs of Yanchang Oilfield

作　　者：王香增 杨红[1,3] 王伟 李剑 梁全胜 WANG Xiangzeng;YANG Hong;WANG Wei;LI Jian;LIANG Quansheng(Shaanxi Key Laboratory of CO_(2) Sequestration and Enhanced Oil Recovery,Xi’an City,Shaanxi Province,710065,China;Shaanxi Yangchang Petroleum(Group)Co.,Ltd.,Xi’an City,Shaanxi Province,710065,China;Research Institute of Shaanxi Yangchang Petroleum(Group)Co.,Ltd.,Xi’an City,Shaanxi Province,710065,China)

机构地区：[1]陕西省CO_(2)封存与提高采收率重点实验室,陕西西安710065 [2]陕西延长石油(集团)有限责任公司,陕西西安710065 [3]陕西延长石油(集团)有限责任公司研究院,陕西西安710065

出　　处：《油气地质与采收率》2022年第4期69-75,共7页Petroleum Geology and Recovery Efficiency

基　　金：国家重点研发计划项目“CO_(2)驱油技术及地质封存安全监测”(2018YFB0605500);“延长油田低渗透油藏CO_(2)混相驱关键技术研究”(2019YFE0100100-16)。

摘　　要：延长油田低渗透油藏储量大,受储层基质致密、裂缝系统复杂的影响,常规注水开发效果差,原油采收率低,油田提高采收率需求迫切。基于延长油田CO_(2)非混相驱油与封存一体化、低温油藏空气泡沫驱、生物活性复合驱和微生物驱技术及矿场实践,提出了低渗透油藏CO_(2)非混相驱“溶蚀增渗、润湿促渗”新理论,形成了以提高CO_(2)驱混相程度和CO_(2)驱立体均衡动用为主的CO_(2)非混相驱油技术,揭示了浅层低温油藏复合耗氧机制,完善了空气泡沫、生物活性复合剂和内源微生物激活剂配方体系。矿场实践表明低渗透油藏提高采收率技术在延长油田具有广阔的应用前景。Yanchang Oilfield has rich reserves of low permeability reservoirs,but the conventional waterflooding development of these reservoirs shows the poor performance and the low oil recovery due to the tight reservoir matrix and the complex fracture systems.Therefore,it is urgent to enhance oil recovery in Yanchang Oilfield.In this paper,a new theory of“corrosion increasing permeability,wetting promoting permeability”was proposed for CO_(2) immiscible flooding in low perme⁃ability reservoirs base on the technologies and the field practices of the integrated CO_(2) immiscible flooding and sequestration,the air foam flooding at low temperature,the bioactive combination flooding and the microbial flooding.A CO_(2) immiscible flooding technology was developed to mainly improve CO_(2) miscibility and enhance 3D equilibrium producing of CO_(2) flooding.Moreover,the complex oxygen consumption mechanism in shallow reservoirs with a low temperature was revealed,and the formula systems of the air foam,the bioactive agents,and the endogenous microbial activators were improved.The field practices indicated that the prospect of enhanced oil recovery technology for low permeability oil reservoirs is broad in Yanchang Oilfield.

关 键 词：低渗透 提高采收率 CO_(2)驱 空气泡沫驱 生物活性复合驱 微生物驱 延长油田 

分 类 号：TE357[石油与天然气工程—油气田开发工程]