基于核磁共振技术的黏弹性颗粒驱油剂流动特征  

Flow Characteristics of Viscoelastic Particle Flooding Agent Based on Nuclear Magnetic Resonance Technology

作　　者：孙焕泉 徐龙[2] 王卫东[2] 曹绪龙 姜祖明 祝仰文 李亚军[2] 宫厚健[2] 董明哲[2] SUN Huan-quan;XU Long;WANG Wei-dong;CAO Xu-long;JIANG Zu-ming;ZHU Yang-wen;LI Ya-jun;GONG Hou-jian;DONG Ming-zhe(Exploration and Development Research Institute of Shengli Oilfield,China Petroleum&Chemical Corporation,Dongying 257015,China;School Petroleum Engineering,China University of Petroleum(East China),Qingdao 266580,China)

机构地区：[1]中国石油化工集团胜利油田勘探开发研究院,东营257015 [2]中国石油大学(华东)石油工程学院,青岛266580

出　　处：《科学技术与工程》2021年第2期546-550,共5页Science Technology and Engineering

基　　金：国家科技重大专项(2016ZX05011-003);中国石化非均相复合驱提高采收率示范工程项目课题(P19007-2);中国石化优秀青年创新基金(P19006)。

摘　　要：首次通过核磁共振技术和岩心驱替实验相结合的方法,对黏弹性颗粒(B-PPG)驱油剂在岩心中的流动特征进行深入研究。驱替结果表明:B-PPG在岩心孔隙介质中以重复堵塞-变形-通过的方式运移。核磁共振横向弛豫时间(T2)图谱明确了B-PPG在孔隙介质中的调剖作用,即B-PPG首先运移进入大孔隙,然后对其进行封堵,促使液流转向较小孔隙。核磁共振图像直观揭示了B-PPG驱油剂在岩心孔隙中的流动分布状态,B-PPG驱油剂驱替前缘均匀推进,能够进入水驱波及不到的区域,具有显著的调整微观非均质性、增大波及系数的能力。渗透率、B-PPG浓度及注入速率对B-PPG驱油剂的流动特征具有显著影响。增大渗透率能够提高B-PPG在孔隙介质中注入性;增大浓度或降低注入速率有利于B-PPG堵塞大孔隙,液流转向较小孔隙,提高波及系数。The flow characteristics of viscoelastic particle(B-PPG)oil displacing agent in the core were firstly in depth studied by a combination of nuclear magnetic resonance technology and core displacement experiments.The displacement results show that B-PPG migrates in the porous medium by repeated blocking-deformation-passing.The nuclear magnetic resonance transverse relaxation time(T2)spectrum clearly clarifies the profile-controlling effect of B-PPG in the pore medium,that is,B-PPG first enters the large pores,then blocks them,and promotes the fluid flow to the smaller pores.The nuclear magnetic resonance image visually reveals the flow distribution of B-PPG oil displacing agent in the core pores.The B-PPG oil displacing agent advances uniformly in the displacement front,can enter the area which cannot be reached by water flooding,and has the ability to significantly adjust the micro heterogeneity and increase the spread coefficient.Permeability,B-PPG concentration and injection rate have significant effects on the flow characteristics of B-PPG oil displacement agents.Increasing the permeability can improve the injectability of B-PPG in the porous medium.Increasing the concentration or decreasing the injection rate helps B-PPG to block large pores and the fluid flow turns to smaller pores,which improves the spread coefficient.

关 键 词：核磁共振 黏弹性颗粒 T2图谱 运移方式 流动特征 

分 类 号：TE357[石油与天然气工程—油气田开发工程]