SCI和EI收录∣中国化工学会会刊

中国化学工程学报 ›› 2020, Vol. 28 ›› Issue (11): 2938-2945.DOI: 10.1016/j.cjche.2020.07.026

• Energy, Resources and Environmental Technology • 上一篇    下一篇

Activating solution gas drive as an extra oil production mechanism after carbonated water injection

Mahmood Shakiba1,2, Shahab Ayatollahi3, Masoud Riazi1   

  1. 1 Enhanced Oil Recovery (EOR) Research Centre, IOR/EOR Research Institute, Shiraz University, Shiraz, Iran;
    2 Department of Petroleum Engineering, Amirkabir University of Technology, Tehran, Iran;
    3 School of Chemical and Petroleum Engineering, Sharif University of Technology, Tehran, Iran
  • 收稿日期:2020-06-05 修回日期:2020-07-18 出版日期:2020-11-28 发布日期:2020-12-31
  • 通讯作者: Masoud Riazi

Activating solution gas drive as an extra oil production mechanism after carbonated water injection

Mahmood Shakiba1,2, Shahab Ayatollahi3, Masoud Riazi1   

  1. 1 Enhanced Oil Recovery (EOR) Research Centre, IOR/EOR Research Institute, Shiraz University, Shiraz, Iran;
    2 Department of Petroleum Engineering, Amirkabir University of Technology, Tehran, Iran;
    3 School of Chemical and Petroleum Engineering, Sharif University of Technology, Tehran, Iran
  • Received:2020-06-05 Revised:2020-07-18 Online:2020-11-28 Published:2020-12-31
  • Contact: Masoud Riazi

摘要: Enhanced oil recovery (EOR) methods are mostly based on different phenomena taking place at the interfaces between fluid-fluid and rock-fluid phases. Over the last decade, carbonated water injection (CWI) has been considered as one of the multi-objective EOR techniques to store CO2 in the hydrocarbon bearing formations as well as improving oil recovery efficiency. During CWI process, as the reservoir pressure declines, the dissolved CO2 in the oil phase evolves and gas nucleation phenomenon would occur. As a result, it can lead to oil saturation restoration and subsequently, oil displacement due to the hysteresis effect. At this condition, CO2 would act as insitu dissolved gas into the oil phase, and play the role of an artificial solution gas drive (SGD).
In this study, the effect of SGD as an extra oil recovery mechanism after secondary and tertiary CWI (SCWI-TCWI) modes has been experimentally investigated in carbonate rocks using coreflood tests. The depressurization tests resulted in more than 25% and 18% of original oil in place (OOIP) because of the SGD after SCWI and TCWI tests, respectively. From the ultimate enhanced oil recovery point of view, the efficiency of SGD was observed to be more than one-third of that of CWI itself. Furthermore, the pressure drop data revealed that the system pressure depends more on the oil production pattern than water production.

关键词: Solution gas drive, Gas nucleation, Carbonated water, Enhanced oil recovery, CO2 capture

Abstract: Enhanced oil recovery (EOR) methods are mostly based on different phenomena taking place at the interfaces between fluid-fluid and rock-fluid phases. Over the last decade, carbonated water injection (CWI) has been considered as one of the multi-objective EOR techniques to store CO2 in the hydrocarbon bearing formations as well as improving oil recovery efficiency. During CWI process, as the reservoir pressure declines, the dissolved CO2 in the oil phase evolves and gas nucleation phenomenon would occur. As a result, it can lead to oil saturation restoration and subsequently, oil displacement due to the hysteresis effect. At this condition, CO2 would act as insitu dissolved gas into the oil phase, and play the role of an artificial solution gas drive (SGD).
In this study, the effect of SGD as an extra oil recovery mechanism after secondary and tertiary CWI (SCWI-TCWI) modes has been experimentally investigated in carbonate rocks using coreflood tests. The depressurization tests resulted in more than 25% and 18% of original oil in place (OOIP) because of the SGD after SCWI and TCWI tests, respectively. From the ultimate enhanced oil recovery point of view, the efficiency of SGD was observed to be more than one-third of that of CWI itself. Furthermore, the pressure drop data revealed that the system pressure depends more on the oil production pattern than water production.

Key words: Solution gas drive, Gas nucleation, Carbonated water, Enhanced oil recovery, CO2 capture