纳米驱油剂扩大水驱波及体积机理  

Mechanism of expanding swept volume by nano-sized oil-displacement agent

作　　者：雷群[1] 罗健辉[1,2] 彭宝亮 王小聪[1,2] 肖沛文 王平美 贺丽鹏 丁彬[1] 耿向飞 LEI Qun;LUO Jianhui;PENG Baoliang;WANG Xiaocong;XIAO Peiwen;WANG Pingmei;HE Lipeng;DING Bin;GENG Xiangfei(Research Institute of Petroleum Exploration&Development,PetroChina,Beijing 100083,China;Key Laboratory of Nano Chemistry(KLNC),CNPC,Beijing 100083,China)

机构地区：[1]中国石油勘探开发研究院,北京100083 [2]中国石油天然气集团有限公司纳米化学重点实验室,北京100083

出　　处：《石油勘探与开发》2019年第5期937-942,共6页Petroleum Exploration and Development

基　　金：中国石油天然气股份有限公司科学研究与技术开发项目“纳米智能驱油剂研制”课题(2018A-0907)

摘　　要：采用低场核磁共振(LF-NMR)岩心驱替实验测试iNanoW1.0纳米驱油剂扩大特低渗透岩心水驱波及体积的效果,并通过氧谱核磁共振(17O-NMR)和毛细作用分析实验分析其扩大水驱波及体积的机理。LF-NMR岩心驱替实验结果表明,iNanoW1.0纳米驱油剂能够在常规水驱的基础上增加10%~20%的波及体积,使水分子进入常规水驱不能波及的低渗小孔隙区域。17O-NMR实验和毛细作用分析证实iNanoW1.0纳米粒子能够减弱水分子间的氢键缔合作用,有效改变水分子网络结构,从而使普通水进入常规水驱不能波及的低渗小孔隙区域,增加波及体积;其减弱氢键缔合作用的能力随iNanoW1.0纳米粒子质量分数的增加而增强,且在达到0.1%后趋于稳定。The effect of expanding swept volume by iNanoW1.0 nanoparticles in ultra-low permeability core was studied by low-field nuclear magnetic resonance(LF-NMR)technology,and the mechanism of expanding swept volume was explained by oxygen spectrum nuclear magnetic resonance(17O-NMR)experiments and capillarity analysis.The results of the LF-NMR experiment show that the nano-sized oil-displacement agent iNanoW1.0 could increase the swept volume by 10%-20%on the basis of conventional water flooding,making water molecules get into the low permeable region with small pores that conventional water flooding could not reach.17O-NMR technique and capillary analysis proved that iNano W1.0 nanoparticles could weaken the association of hydrogen bonds between water molecules,effectively change the structure of water molecular clusters,and thus increasing the swept volume in the low permeable region.The ability of weakening association of hydrogen bonds between water molecules of iNanoW1.0 nanoparticles increases with its mass fraction and tends to be stable after the mass fraction of 0.1%.

关 键 词：纳米粒子 纳米驱油剂 水驱波及体积 水分子氢键缔合作用 毛细作用 

分 类 号：TE357[石油与天然气工程—油气田开发工程]