西南石油大学学报(自然科学版)

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Advances of Researches on Improving the Stability of CO2 Foams by Nanoparticles

Li Zhaomin, Wang Peng, Li Songyan, Sun Qian, Li Yang   

  1. School of Petroleum Engineering,China University of Petroleum,Qingdao,Shandong 266555,China
  • Online:2014-08-01 Published:2014-08-01

Abstract:

The surfactant-stabilized CO2 foams can effectively control the mobility of CO2,strengthening the flooding advantages of CO2. However,the surfactant has a large retention loss in reservoir rock and does not have a good stability under high-temperature and high-salinity reservoir conditions. Nanoparticles can be used as stabilizer to improve the foam stability. The advantages of nanoparticles in stabilizing CO2 foams were analyzed. The stabilization mechanisms of CO2 foams by nanoparticles were summarized from the aspects of particle-interface interaction and partial-particle interaction,including detachment energy theory,maximum capillary theory and the network structure theory. Effect of different factors,including the hydrophobicity,nanoparticle size,nanoparticle concentration,salinity,temperature and pressure,on the generation and stability of CO2 foams were investigated. The potential application of nanoparticle-stabilized CO2 foams for mobility control and oil displacement was analyzed. Several problems in current study and direction of further studies on nanoparticle-stabilized CO2 foams were proposed.

Key words: nanoparticle, CO2 foams, mechanisms of stabilization, affecting factors, potential application