摘要
微球初始粒径小、注入压力低、可深部运移而被各大油田广泛应用。为解决强非均质性油藏中,微球与地层孔隙匹配性差,封堵性和耐冲刷性弱等缺点,提出了将微球与聚合物凝胶复合的调驱体系。优选的复合体系配方为3000mg·L^-1疏水缔合聚合物AP-P4+100mg·L^-1乙酸铬+2000mg·L^-1微球。室内实验结果表明,复合体系在60℃温度和9047.65mg·L^-1矿化度的油藏条件下8h成胶,强度为D级;复合体系封堵性良好,突破压力可达3.70MPa,在级差10.60的双并联岩心中,注入的复合体系可封堵高渗透层,能改善非均质岩心的吸水剖面,可提高原油采收率31.19%。
Microsphere has been widely used in oil fields because of their small initial particle size,low injection pressure and deep migration.In order to solve the shortcomings of microsphere in strongly heterogeneous reservoirs,such as poor matching between microspheres and formation pores,weak plugging and flushing resistance,etc.,a profile-control and flooding system combining microsphere with polymer gel is proposed.The optimal compound system formulation is 3000mg·L^-1 hydrophobic associating polymer AP-P4+100mg·L^-1 chromium acetate+2000mg·L^-1 microsphere.The results of laboratory experiments show that under the conditions of 60℃and 9047.65mg·L^-1 salinity,the gelation time of the composite system is 8 hours,and the maximum gelation strength is grade D.The composite system has good plugging performance,and the breakthrough pressure can reach 3.70MPa.In the double-parallel core with a grade difference of 10.60,the injected composite system can plug the high permeability layer,improve the water absorption profile of the heterogeneous core,and increase the oil recovery rate by 31.19%.
作者
黎慧
鞠野
代磊阳
王楠
刘丰钢
刘光普
俞爽
LI Hui;JU Ye;DAI Lei-yang;WANG Nan;LIU Feng-gang;LIU Guang-pu;YU Shuang(Tianjin Branch of CNOOC(China)Limited,Tianjin 300457,China;China Oilfield Services Limited,Tianjin 300457,China;Fourth Institute of Henan Resources and Environment Survey,Zhengzhou 450000,China)
出处
《化学工程师》
CAS
2020年第11期67-71,共5页
Chemical Engineer
基金
四川省科技计划资助(No.2019YFG0148)。
关键词
微球
凝胶
协同增效
封堵性
调剖和驱油
提高采收率
microsphere
gel
synergistic collaboration
plugging property
profile control and oil displacement
enhanced oil recovery
