重庆科技学院学报（自然科学版）2018，Vol.20Issue(2)：39-43,5.
致密油藏自渗吸提高采收率影响因素研究
Key Impact Factors of Spontaneous Imbibition EOR in Tight Oil Reservoirs
摘要
Abstract
With regards to low recoverable reserves and rapid production declining in tight oil reservoirs,a dual porosity and dual permeability spontaneous-imbibition EOR mathematical model is developed for the oil-wet tight reservoirs to investigate the impact of fracture spacing,matrix permeability,capillary pressure,oil viscosity on increased recovery ef-ficiency. The results show that the injected surfactant can alter reservoir wettability from oil wet to medium or even water wet,then trigger spontaneous imbibition and finally favor oil movement from matrix into fracture. EOR results is positive-ly related with fracture density and capillary pressure. The specific surface area of matrix grows with increasing fracture density,which boosts strength of spontaneous imbibition and oil production rate. Capillary pressure should be retained as big as possible to ascertain EOR results,combined with wettability alternation. Spontaneous imbibition EOR method is favorable for oil-wet tight reservoirs with relatively low viscosity of oil and high permeability of matrix.关键词
致密油藏/亲油/自发渗吸/提高采收率/数值模拟Key words
tight oil/oil wet/spontaneous imbibition/EOR/numerical simulation分类
能源科技引用本文复制引用
未志杰,康晓东,刘玉洋,杨光..致密油藏自渗吸提高采收率影响因素研究[J].重庆科技学院学报（自然科学版）,2018,20(2):39-43,5.基金项目
"十三五"国家科技重大专项"海上油田化学驱油技术"(2016ZX05025-003) （2016ZX05025-003）
中海油NEXEN联合研发项目"Col-laborative Research to Develop and Test Activators to Improve Recovery in Tight Oil Assets"(2017OT-JY52) （2017OT-JY52）
