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

作　　者：陈永成[1] 孙岿 张向宇[1] 唐洁云 周晓峰 CHEN Yongcheng;SUN Kui;ZHANG Xiangyu;TANG Jieyun;ZHOU Xiaofeng(E&D Research Institute of PetroChina Liaohe Oilfield Company,Panjin 124010,China;Develoment Division of PetroChina Liaohe Oilfield Company,Panjin 124010,China;State Key Laboratory of Continental Shale Oil,Daqing 163712,China;Unconventional Oil and Gas Research Institute,Northeast Petroleum University,Daqing 163318,China)

机构地区：[1]中国石油辽河油田公司勘探开发研究院,辽宁盘锦124010 [2]中国石油辽河油田公司开发事业部,辽宁盘锦124010 [3]多资源协同陆相页岩油绿色开采全国重点实验室,黑龙江大庆163712 [4]东北石油大学非常规油气研究院,黑龙江大庆163318

出　　处：《大庆石油地质与开发》2025年第2期156-166,共11页Petroleum Geology & Oilfield Development in Daqing

基　　金：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);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);黑龙江省自然科学基金联合引导项目“超临界CO_(2)作用下高泥质含量页岩油储层润湿性演化及渗吸机理”(LH2021E014)。

摘　　要：为了明确渗吸对于页岩储层的微观动用特征及提高原油采收率作用规律,基于核磁共振技术开展了不同渗吸体系下的高温高压在线核磁共振渗吸实验,定量研究了不同级别孔隙的微观动用特征及渗吸驱油效果。在此基础上,创新形成了二维核磁共振解释方法,明确了不同原油赋存孔隙对提高采收率的贡献。结果表明:低黏滑溜水、胍尔胶破胶液、CO_(2)渗吸液及表活剂型低黏滑溜水体系的渗吸采收率分别为16.14%、11.80%、21.00%和14.68%,CO_(2)渗吸液的开发效果最佳。整个渗吸过程可视为一个有机系统,在确保小孔隙采出程度的同时,最大限度地提高中大孔隙动用程度至关重要;随着渗吸量的增加,岩样的游离油动用程度增大,T1/T2上升,残余油逐渐以吸附态和有机质为主,可采性变差;水基渗吸介质对于黏土层间吸附油的动用效果更好,而CO_(2)渗吸液可深入页岩有机质小孔隙中充分发挥渗吸置换作用,有机质微孔原油的相对采收率可提高11.01~23.54百分点。研究成果可为页岩油的高效开发提供借鉴。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,CO_(2) imbibition liquid and surfactant-type low-viscosity slickwater are 16.14%,11.80%,21.00%and 14.68%,respectively,with CO_(2)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 CO_(2) 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 

分 类 号：P618.13[天文地球—矿床学] TE357[天文地球—地质学]