基于核磁共振实验的纳米驱油剂驱油效果——以大庆外围油田特低渗致密储层为例  

Displacement effect by nano oil displacement agent based on NMR experiment:Taking ultra-low permeability tight reservoirs of Daqing peripheral oilfields as examples

作　　者：董献宇 祖琳[4] 杨正明[2,3] 李海波[3] 郑宪宝[4] 骆雨田 赵新礼[1,2,3] DONG Xianyu;ZU Lin;YANG Zhengming;LI Haibo;ZHENG Xianbao;LUO Yutian;ZHAO Xinli(College of Engineering Science,University of Chinese Academy of Sciences,Beijing 101400,China;Institute of Percolation and Fluid Mechanics,Chinese Academy of Sciences,Langfang 065007,China;PetroChina Research Institute of Petroleum Exploration and Development,Beijing 100083,China;Exploration and Development Research Institute of Daqing Oilfield Co Ltd,Daqing 163712,China)

机构地区：[1]中国科学院大学工程科学学院,北京101400 [2]中国科学院渗流流体力学研究所,河北廊坊065007 [3]中国石油勘探开发研究院,北京100083 [4]中国石油大庆油田有限责任公司勘探开发研究院,黑龙江大庆163712

出　　处：《大庆石油地质与开发》2022年第4期107-115,共9页Petroleum Geology & Oilfield Development in Daqing

基　　金：国家科技重大专项“超低渗油藏物理模拟方法与渗流机理”(2017ZX05013-001)。

摘　　要：特低渗透油藏具有渗透率低、毛细管阻力大等特点,常规注水开发较为困难,采出程度较低,开发过程中剩余油仍大量存在。作为一种较新的驱油手段,纳米驱油剂驱油机理尚未明确,与特低渗致密岩心结合的驱油效果研究较少。为了进一步提高采收率,需探索纳米驱油剂等新的注入介质,揭示其驱油机理。以大庆外围油田特低渗透储层岩心为研究对象,将核磁共振技术与水驱油物模实验、渗吸实验相结合,对储层水驱油与纳米驱油剂驱油后微观剩余油分布特征进行研究,从而为储层开发方式选择提供依据。结果表明:纳米驱油剂的驱油效果和渗吸效果都比水驱要好,纳米驱油剂更适合渗透率为0.4×10~1×10μm的储层;纳米驱油剂能改善储层的润湿性,提高原油的采出程度;纳米驱油剂的驱替效果随着渗吸时间延长效果会更好。在现场使用纳米驱油剂时要注意减缓注入速度与延长驱替时间,以获得更好的效果。Ultra-low permeability oil reservoirs are characterized by low permeability,high capillary resistance and so on,bringing much challenge to conventional water flooding with lower recovery degree and still a large amount of remaining oil in the development process. At present,as a newer method of oil displacement,the mechanism of nano oil displacement agent is not clear,and oil displacement effect combined with ultra-low permeability tight core is rarely studied. In order to further enhance oil recovery,it is necessary to explore new injection media such as nano oil displacement agent and reveal their displacement mechanisms. Taking the cores of ultra-low permeability reservoirs in Daqing peripheral oilfields as research object,combining NMR technology with waterflooding physical simulation experiment and imbibition experiment,the distribution characteristics of microscopic remaining oil after water and nano displacement agent are studied so as to provide evidence for reservoir development methods. The research shows that displacement effects of nano oil displacement agent and imbibition are better than those of water flooding,nano oil displacement agent is more suitable for reservoirs with the permeability of 0.4×10-3~1×10-3μm2.Nano oil displacement agent can improve wettability of reservoirs and increase recovery degree. Displacement effects of nano oil displacement agent will be better with prolonged imbibition time. When nano oil displacement agent is used in the field,attentions should be paid to slowing down injection rate and prolonging displacement time to obtain better effects.

关 键 词：特低渗透 纳米驱油剂 水驱油 核磁共振 剩余油分布 

分 类 号：TE357.46[石油与天然气工程—油气田开发工程]