聚合物-弱凝胶调驱核磁共振可视化实验  

Visualization experiments on polymer-weak gel profile control and displacement by NMR technique

作　　者：狄勤丰[1,2] 张景楠[1,2] 华帅[1,2] 陈会娟[1,2] 顾春元[1,2] DI Qinfeng ZHANG Jingnan HUA Shuai CHEN Huijuan GU Chunyuan(Shanghai Institute of Applied Mathematics and Mechanics, Shanghai University, Shanghai 200072, China Shanghai Key Laboratory of Mechanics in Energy Engineering, Shanghai 200072, China)

机构地区：[1]上海大学上海市应用数学和力学研究所,上海200072 [2]上海市力学在能源工程中的应用重点实验室,上海200072

出　　处：《石油勘探与开发》2017年第2期270-274,共5页Petroleum Exploration and Development

基　　金：国家自然科学基金(50874071;51274136);上海市重点学科建设项目(S30106);国家高技术研究发展计划(863)项目(2008AA06Z201);上海市教育委员会高峰学科建设项目

摘　　要：将核磁共振可视化技术和岩心驱替实验相结合,观察了弱凝胶在岩心中的分布特征和运移规律,对不同聚合物-弱凝胶组合方式下的驱油特征进行可视化实验研究。将聚合物和弱凝胶进行组合,设计了3种组合方式:水驱+聚合物驱(方式1),水驱+聚合物驱+弱凝胶驱(方式2),水驱+弱凝胶驱+聚合物驱(方式3)。对不同组合方式在驱替过程中的压力变化、T_2谱特征、核磁共振图像、驱油效率进行了研究。研究表明,核磁共振图像可直观表征弱凝胶在岩心中的形态分布及运移特征,也可反映出残余油的分布特征;T_2谱特征表明聚合物和弱凝胶均具有调剖和驱油作用,组合方式2的调剖效果最明显;3种组合方式中,组合方式2的驱油效率最大,为78.84%,比初次水驱提高了18.33%。The distribution characteristics and migration pattern of weak gel in the core were observed by combining nuclear magnetic resonance（NMR） imaging technology with the core displacement experiment, and the oil displacement features of different polymer-weak gel combinations were examined with visualization experiments. Three combination patterns of polymer and weak gel were designed： waterflooding＋ polymer flooding（pattern 1）, waterflooding ＋ polymer flooding ＋ weak gel flooding（pattern 2）, and waterflooding ＋ weak gel flooding ＋ polymer flooding（pattern 3）. The pressure variations, T_2 spectra, nuclear magnetic resonance images, oil displacement efficiencies under the different patterns were analyzed. The results show that the nuclear magnetic images can not only provide the direct information of weak gel distribution and migration characteristics inside the core, but also reflect the distribution characteristics of remaining oil; the T_2 spectrum characteristics indicate that both polymer and weak gel have the function of profile control and oil displacement, and the pattern 2 has the best profile control effect; of the three patterns, pattern 2 has the highest oil displacement efficiency of 78.84%, which is 18.33% higher than the displacement efficiency of water flooding in the initial stage.

关 键 词：弱凝胶 聚合物 核磁共振 可视化驱替实验 驱油效率 

分 类 号：TE357.46[石油与天然气工程—油气田开发工程]