Measurement of trapped gas saturation in carbonate rock: comparing 2-phase and 3-phase data to support CCS and CO2 EOR projects
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| Sprache: | Englisch |
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2023
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| author | Masalmeh, Shehadeh Farzaneh, Amir Sohrabi, Mehran Al-Mesmari, Ali Al-Hammadi, Mohammad |
| author_facet | Masalmeh, Shehadeh Farzaneh, Amir Sohrabi, Mehran Al-Mesmari, Ali Al-Hammadi, Mohammad |
| contents | <p>This paper presents a comprehensive experimental study of trapped gas saturation (Sgt) using carbonate rocks, a crucial parameter for CO2 storage (CCS) and gas-based Enhanced Oil Recovery (gEOR) processes. The study aimed to measure Sgt under different injection strategies, rock types, wettability, and injection sequences using limestone reservoir cores taken from two different reservoirs (B and G) and one saline aquifer. The experiments were conducted under both 2-phase and 3-phase flow conditions, using CO2 as injection gases and water and oil as displacing fluids. The 3-phase experiments revealed that Sgt is strongly dependent on the order of fluid injection sequence, with a higher Sgt observed during WAG experiments starting with water injection (WAG_W) compared to those starting with gas injection (WAG_G). Furthermore, a significant difference in trapped gas saturation was observed between the cores from reservoir G and reservoir B, with higher Sgt observed for reservoir G despite having higher permeability. The study also found that trapped gas saturation increases as the initial water saturation increases in samples sinitialised at mobile water saturation to mimic the transition zone. Interestingly, trapped gas saturation measured in WAG_G experiments starting at mobile water saturation was higher than that measured in WAG_G experiments starting at connate water, despite the initial gas saturation being much higher in the latter. Moreover, trapped gas by saline brine was measured on core samples from reservoir G and saline aquifer to study the impact of different rock types. The results on core G showed that Sgt is much higher in 2-phase compared to 3-phase experiments. The 2-phase experiments showed that trapped CO2 by water is higher than trapped CO2 by oil. This study presents a comprehensive dataset that is vital for validating gas injection and storage models in commercial simulators. The results demonstrate that Sgt obtained in 2-phase flow experiments is not applicable to 3-phase flow conditions, and capillary trapped gas in CCS projects is much higher than trapped gas in CO2 EOR projects. The results also show that trapped gas saturation during WAG cannot be modelled using a simple trapping function that only correlates trapped gas with initial gas saturation</p> |
| format | Recurso digital |
| id | zenodo_https___doi_org_10_5281_zenodo_16196031 |
| institution | Zenodo |
| language | eng |
| publishDate | 2023 |
| publisher | Zenodo |
| record_format | zenodo |
| spellingShingle | Measurement of trapped gas saturation in carbonate rock: comparing 2-phase and 3-phase data to support CCS and CO2 EOR projects Masalmeh, Shehadeh Farzaneh, Amir Sohrabi, Mehran Al-Mesmari, Ali Al-Hammadi, Mohammad 2023 SCA Oral SCAL for Carbon Storage and Utilization <p>This paper presents a comprehensive experimental study of trapped gas saturation (Sgt) using carbonate rocks, a crucial parameter for CO2 storage (CCS) and gas-based Enhanced Oil Recovery (gEOR) processes. The study aimed to measure Sgt under different injection strategies, rock types, wettability, and injection sequences using limestone reservoir cores taken from two different reservoirs (B and G) and one saline aquifer. The experiments were conducted under both 2-phase and 3-phase flow conditions, using CO2 as injection gases and water and oil as displacing fluids. The 3-phase experiments revealed that Sgt is strongly dependent on the order of fluid injection sequence, with a higher Sgt observed during WAG experiments starting with water injection (WAG_W) compared to those starting with gas injection (WAG_G). Furthermore, a significant difference in trapped gas saturation was observed between the cores from reservoir G and reservoir B, with higher Sgt observed for reservoir G despite having higher permeability. The study also found that trapped gas saturation increases as the initial water saturation increases in samples sinitialised at mobile water saturation to mimic the transition zone. Interestingly, trapped gas saturation measured in WAG_G experiments starting at mobile water saturation was higher than that measured in WAG_G experiments starting at connate water, despite the initial gas saturation being much higher in the latter. Moreover, trapped gas by saline brine was measured on core samples from reservoir G and saline aquifer to study the impact of different rock types. The results on core G showed that Sgt is much higher in 2-phase compared to 3-phase experiments. The 2-phase experiments showed that trapped CO2 by water is higher than trapped CO2 by oil. This study presents a comprehensive dataset that is vital for validating gas injection and storage models in commercial simulators. The results demonstrate that Sgt obtained in 2-phase flow experiments is not applicable to 3-phase flow conditions, and capillary trapped gas in CCS projects is much higher than trapped gas in CO2 EOR projects. The results also show that trapped gas saturation during WAG cannot be modelled using a simple trapping function that only correlates trapped gas with initial gas saturation</p> |
| title | Measurement of trapped gas saturation in carbonate rock: comparing 2-phase and 3-phase data to support CCS and CO2 EOR projects |
| topic | 2023 SCA Oral SCAL for Carbon Storage and Utilization |
| url | https://doi.org/10.5281/zenodo.16196031 |