乳液型水基微球的合成及性能评价  

Preparation and performance evaluation of multicomponent water-based supramolecular microspheres

作　　者：王浩颐 苏程 李翔 徐国瑞[1,2,3] 刘丰钢 常振[1,2,3] WANG Haoyi;SU Cheng;LI Xiang;XU Guorui;LIU Fenggang;CHANG Zhen(National Key Laboratory of Offshore Oil and Gas Exploitation,Tianjin 300459,China;Tianjin Key Laboratory of Marine Oil Hard-to-use Reserves Exploitation,Tianjin 300459,China;China Oilfield Services Limited,Tianjin 300459,China)

机构地区：[1]海洋油气高效开发全国重点实验室,天津300459 [2]天津市海洋石油难动用储量开采重点实验室,天津300459 [3]中海油田服务股份有限公司,天津300459

出　　处：《油气井测试》2024年第6期27-35,共9页Well Testing

基　　金：中国海洋石油集团有限公司科研项目“超分子微球调驱技术优化及应用”(YSB21YF004)。

摘　　要：针对低渗透油藏常规调驱剂耐温耐盐性差、注入困难的问题,以水作为溶剂,通过乳化剂、pH缓冲剂、丙烯酰胺、丙烯酸、2-丙烯酰胺-2-甲基丙磺酸和多种疏水性单体,采用乳液聚合法合成了乳液型水基超分子微球。利用红外光谱、核磁氢谱、扫描电镜、粒度分析、黏度测试以及岩心实验等多种测试手段对乳液型水基超分子微球进行了结构表征与性能测试。结果表明,单体总用量和交联剂含量决定了微球的初始粒径和黏度变化,通过优选浓度合成出的粒径约200 nm、黏度5~6 mPa·s的微球,在不同矿化度盐浓度和环境温度中表现出良好的耐温耐盐性能。岩心实验结果表明,不同浓度的超分子微球,在渗透率100~1000 mD的岩心内封堵率均高于85%,在三层非均质岩心驱油效果评价中,水驱基础上采收率增幅可高达14%以上。该实验结果对提高油田采收率具有一定的指导作用。Aiming at the problems such as poor temperature and salt resistance and difficult injection of conventional flooding agent in low-permeability reservoir,multicomponent water-based supramolecular microspheres were prepared by emulsion polymerization with water as solvent,acrylamide acrylic acid 2-acrylamide-2-methylpropanesulfonic acid as emulsifier and various hydrophobic monomers.The structure and properties of water-based supramolecular microspheres were characterized by IR,NMR,SEM,particle size,viscosity and core experiments.The research results indicate that the initial particle size and viscosity of microspheres were determined by the total amount of monomer and the content of crosslinking agent.The microspheres with particle size of about 200 nm and viscosity of about 5~6 mPa·s were prepared by optimization,and showed good temperature and salt resistance at different salinity concentrations and ambient temperatures.Core experiments show that the plugging rate of supramolecular microspheres with different concentrations is higher than 85%in cores with permeability of 100~1000 mD.In the evaluation of oil displacement effect of three-layer heterogeneous core,the recovery rate can be increased by more than 14%on the basis of water flooding.The experimental results have a certain guiding role in improving oil recovery.

关 键 词：低渗透油藏 调驱 疏水性单体 乳液聚合法 水基超分子微球 交联剂含量 性能评价 封堵效果 

分 类 号：TE358[石油与天然气工程—油气田开发工程]