Acta Phys. -Chim. Sin. ›› 2010, Vol. 26 ›› Issue (11): 2982-2988.doi: 10.3866/PKU.WHXB20101105

• COLLOID AND INTERFACE CHEMISTRY • Previous Articles     Next Articles

Effect of Hydrophobically Modified Polyacrylamide on Interfacial Dilational Rheological Properties of Crude Oil Components

ZONG Hua1, WANG Lei2, FANG Hong-Bo1, MAO Lei-Ting1, WANG Yu-Hui1, ZHANG Lu3, ZHAO Sui3, YU Jia-Yong3   

  1. 1. Shengli Engineering and Consulting Co., Ltd., Shengli Oilfield Company of SINOPEC, Dongying 257000, Shandong Province, P. R. China;
    2. Department of Materials Physics and Chemistry, School of Materials Science and Engineering, University of Science and Technology Beijing, Beijing 100083, P. R. China;
    3. Technical Institute of Physics and Chemistry, Chinese Academy of Sciences, Beijing 100190, P. R. China
  • Received:2010-06-27 Revised:2010-08-16 Published:2010-10-29
  • Contact: ZHANG Lu E-mail:luyiqiao@hotmail.com
  • Supported by:

    The project was supported by the Important National Science&Technology Specific Projects, China (2008ZX05011) and National High Technology Research and Development Programof China (863) (2008AA092801).

Abstract:

The effect of hydrophobically modified polyacrylamide (HMPAM) on the dilational rheological properties of interfacial films containing acidic components or asphaltenes in petroleum crude oil was investigated by drop shape analysis method. The influence of surface-active component concentration on the dilational rheological behavior was investigated. Experimental results show that the dilational modulus is approximately 100 mN·m-1 for a 1750 mg·L-1 HMPAMsolution. This is due to the formation of an interfacial structure by a hydrophobic interaction among HMPAM molecules. As the interfacial film ages, the acidic component molecules adsorb onto the interface and form mixed complexes with the hydrophobic parts of the HMPAMmolecules. These interactions reduce the dilational modulus by a fast exchange process and the elasticity of the structure improves because of an enhanced hydrophobic interaction among the HMPAMmolecules. For asphaltenes, the nature of the interfacial film is controlled by both the structure of HMPAMand the interfacial complex formed by pure asphaltene molecules because of their relatively larger molecular sizes as well as their strong intermolecular interactions, which leads to a slight decrease in the dilational modulus compared with the pure HMPAMsystem.

 

Key words: Hydrophobically modified polyacrylamide, Crude oil, Acidic component, Asphaltene, Interfacial dilational rheology

MSC2000: 

  • O647