中国炼油与石油化工 ›› 2022, Vol. 24 ›› Issue (1): 11-18.

• Scientific Research • 上一篇    下一篇

Study on viscosity reducing and oil displacement agent for water-flooding heavy oil reservoir

秦冰,赵琳,江建林   

  1. 中国石化石油化工科学研究院
  • 收稿日期:2021-08-14 修回日期:2022-01-10 出版日期:2022-03-30 发布日期:2022-03-30
  • 通讯作者: 赵琳 E-mail:zhaolin.ripp@sinopec.com
  • 基金资助:
    驱油用稠油降粘剂研发

Study on viscosity reducing and oil displacement agent for water-flooding heavy oil reservoir

  1. 1.
    2. Research Institute of Petroleum Processing, SINOPEC
  • Received:2021-08-14 Revised:2022-01-10 Online:2022-03-30 Published:2022-03-30

摘要: In the process of water-flooding development of heavy oil reservoir, due to the high viscosity and oil-water mobility ratio of heavy oil, there are some problems such as poor fluidity, high residual oil saturation and low recovery efficiency, which seriously restrict the efficient development of heavy oil. The molecular structure characteristics of asphaltene and resin in heavy oil were analyzed. Based on the three most concerned properties of chemical agents, including emulsification performance, interface performance and oil washing performance, three chemical oil displacement agents for heavy oil reservoirs were developed, and the structure of the chemical agents were characterized by high resolution mass spectrometry. The performance evaluation of chemical agent and core displacement experiment show that there is no obvious correlation between the properties of chemical agents, including interfacial tension, emulsifying ability and oil washing ability. For heavy oil reservoirs, the emulsification and viscosity reduction performance of chemical agents was more important than oil washing capacity, and oil washing capacity was more important than interface performance. Viscosity reduction performance was the key parameter of oil displacement agent suitable for heavy oil reservoir. The composite binary system of viscosity reducer and polymer had better oil recovery than using viscosity reducer alone.

Abstract: In the process of water-flooding development of heavy oil reservoir, due to the high viscosity and oil-water mobility ratio of heavy oil, there are some problems such as poor fluidity, high residual oil saturation and low recovery efficiency, which seriously restrict the efficient development of heavy oil. The molecular structure characteristics of asphaltene and resin in heavy oil were analyzed. Based on the three most concerned properties of chemical agents, including emulsification performance, interface performance and oil washing performance, three chemical oil displacement agents for heavy oil reservoirs were developed, and the structure of the chemical agents were characterized by high resolution mass spectrometry. The performance evaluation of chemical agent and core displacement experiment show that there is no obvious correlation between the properties of chemical agents, including interfacial tension, emulsifying ability and oil washing ability. For heavy oil reservoirs, the emulsification and viscosity reduction performance of chemical agents was more important than oil washing capacity, and oil washing capacity was more important than interface performance. Viscosity reduction performance was the key parameter of oil displacement agent suitable for heavy oil reservoir. The composite binary system of viscosity reducer and polymer had better oil recovery than using viscosity reducer alone.