中国炼油与石油化工 ›› 2021, Vol. 23 ›› Issue (2): 44-54.

• Scientific Research • 上一篇    下一篇

Study on Reducing Injection Pressure of Low Permeability Reservoirs Characterized by High Temperature and High Salinity

赵琳1,秦冰1,吴雄军2,王增林3,江建林1   

  1. 1. 中国石化石油化工科学研究院
    2. 中国石化石油工程技术研究院
    3. 中国石化胜利油田分公司
  • 收稿日期:2020-10-29 修回日期:2021-01-04 出版日期:2021-06-30 发布日期:2021-06-10
  • 通讯作者: 赵琳 E-mail:zhaolinshiyou@126.com
  • 基金资助:
    陆相页岩油流动机理及开采关键技术研究

Study on Reducing Injection Pressure of Low Permeability Reservoirs Characterized by High Temperature and High Salinity

Zhao Lin1,Qin Bing2,Wu Xiongjun2,Wang Zenglin2,Jiang Jianlin2   

  1. 1. Research Institute of Petroleum Processing, SINOPEC
    2.
  • Received:2020-10-29 Revised:2021-01-04 Online:2021-06-30 Published:2021-06-10
  • Contact: Zhao Lin E-mail:zhaolinshiyou@126.com

摘要: In view of the problems of high injection pressure and low water injection rate in water injection wells of low permeability reservoirs with high temperature and high salinity, two new surfactants were synthesized, including quaternary ammonium Gemini surfactant and betaine amphoteric surfactant. The composite surfactant system BYJ-1 was formed by mixing two kinds of surfactants. The minimum interfacial tension between BYJ-1 solution and the crude oil could reach 1.4×10-3mN/m. The temperature resistance was up to 140℃, and the salt resistance was up to 120g/L. For the low permeability core fully saturated with water phase, BYJ-1 could obviously reduce the starting pressure gradient of low permeability core. While for the core with residual oil, BAY-1 could obviously reduce the injection pressure and improve the oil recovery. Moreover, the field test showed that BAY-1 could obviously reduce the injection pressure of the water injection well, increase the injection volume, and increase the liquid production and oil production of the corresponding production well.

关键词: low permeability reservoir, quaternary ammonium salt, betaine surfactant, interfacial tension, reducing injection pressure, enhancing oil recovery

Abstract: In view of the problems of high injection pressure and low water injection rate in water injection wells of low permeability reservoirs with high temperature and high salinity, two new surfactants were synthesized, including quaternary ammonium Gemini surfactant and betaine amphoteric surfactant. The composite surfactant system BYJ-1 was formed by mixing two kinds of surfactants. The minimum interfacial tension between BYJ-1 solution and the crude oil could reach 1.4×10-3mN/m. The temperature resistance was up to 140℃, and the salt resistance was up to 120g/L. For the low permeability core fully saturated with water phase, BYJ-1 could obviously reduce the starting pressure gradient of low permeability core. While for the core with residual oil, BAY-1 could obviously reduce the injection pressure and improve the oil recovery. Moreover, the field test showed that BAY-1 could obviously reduce the injection pressure of the water injection well, increase the injection volume, and increase the liquid production and oil production of the corresponding production well.

Key words: low permeability reservoir, quaternary ammonium salt, betaine surfactant, interfacial tension, reducing injection pressure, enhancing oil recovery