大庆石油地质与开发2025，Vol.44Issue(2)：156-166,11.DOI:10.19597/J.ISSN.1000-3754.202402032
页岩储集层渗吸驱油微观动用特征及提高采收率实验
Experiments on microscopic producing characteristics and enhanced oil recovery of imbibition displacement in shale reservoir
摘要
Abstract
To clarify the microscopic characteristics of imbibition for shale reservoirs and the law of enhanced oil re-covery(EOR),experiment of high-temperature and high-pressure online nuclear magnetic resonance(NMR)imbi-bition with different imbibition systems are performed based on NMR technique,and microscopic producing charac-teristics and imbibition displacement effect of different levels of pores are quantitatively studied.On this basis,in-novatively formed 2D NMR interpretation method determines the contribution of different oil occurrence pores to en-hanced oil recovery.The results show that imbibition recovery by low-viscosity slickwater,guar gel breaker solu-tion,CO2 imbibition liquid and surfactant-type low-viscosity slickwater are 16.14%,11.80%,21.00%and 14.68%,respectively,with CO2 imbibition liquid demonstrating optimal development effect.The entire imbibition process can be considered as an organic system,where maximizing the producing degree of medium and large pores is crucial while simultaneously ensuring the recovery degree of small pores.With increasing imbibition,the free oil producing degree of rock samples increases,T1/T2 rises,and residual oil gradually shifts to adsorbed and organic matter-dominated forms,causing reduced recoverability.Water-based imbibition media demonstrate superior pro-ducing effect for adsorbed oil in interlayered clay,while CO2 imbibition liquid can effectively penetrate organic mat-ter-hosted small pores in shale,leading to enhanced realative recovery of organic matter-hosted micropores by 11.01～23.54 percentage points.The research provides valuable insights for efficient development of shale oil.关键词
页岩油/渗吸/在线核磁共振/微观动用特征/赋存特征/提高采收率Key words
shale oil/imbibition/on-line nuclear magnetic resonance/microscopic producing characteristics/occurrence characteristics/EOR分类
天文与地球科学引用本文复制引用
陈永成,孙岿,张向宇,唐洁云,周晓峰..页岩储集层渗吸驱油微观动用特征及提高采收率实验[J].大庆石油地质与开发,2025,44(2):156-166,11.基金项目
中国石油天然气集团有限公司重大科技专项"利用大型油气藏埋存二氧化碳关键技术标准研究与应用"(2023YFF0614100) （2023YFF0614100）
辽河油田公司重大专项"页岩油大幅提高采收率技术研究"(2024QZJC-01) （2024QZJC-01）
黑龙江省自然科学基金联合引导项目"超临界CO2作用下高泥质含量页岩油储层润湿性演化及渗吸机理"(LH2021E014). （LH2021E014）
