The impact of water injection simulation on CO<sub>2</sub> storage capacity in offshore saline aquifers

YANG Pu; FANG Xiaoyu; WANG Ziwen; HUANG Shirui; LYU Yanxin; YANG Bo

doi:10.16028/j.1009-2722.2024.237

2025 Vol. 41, No. 3

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Article navigation > Marine Geology Frontiers > 2025 > 41(3): 99-106

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YANG Pu, FANG Xiaoyu, WANG Ziwen, HUANG Shirui, LYU Yanxin, YANG Bo. The impact of water injection simulation on CO2 storage capacity in offshore saline aquifers[J]. Marine Geology Frontiers, 2025, 41(3): 99-106. doi: 10.16028/j.1009-2722.2024.237

Citation:

YANG Pu, FANG Xiaoyu, WANG Ziwen, HUANG Shirui, LYU Yanxin, YANG Bo. The impact of water injection simulation on CO₂ storage capacity in offshore saline aquifers[J]. Marine Geology Frontiers, 2025, 41(3): 99-106. doi: 10.16028/j.1009-2722.2024.237

The impact of water injection simulation on CO₂ storage capacity in offshore saline aquifers

1.
Southern Marine Science and Engineering Guangdong Laboratory (Zhanjiang), Zhanjiang 524057, China
2.
Qingdao Key Laboratory of Offshore CO₂ Geological Storage, Qingdao 266237, China
3.
Qingdao Engineering Research Center of Offshore CO₂ Geological Storage, Qingdao 266237, China
4.
Shandong Engineering Research Center of Offshore CO₂ Geological Storage, Qingdao 266237, China
5.
Marine Geological Institute of Hainan Province, Hainan Geological Bureau, Haikou 570000, China
6.
College of Mechatronic Engineering, Southwest Petroleum University, Chengdu 610500, China

More Information

Corresponding author: FANG Xiaoyu, fangxy@zjblab.com

Received Date: 11 October 2024

Publish Date: 28 March 2025

Abstract

Abstract

Continuous or alternating water injection into saline aquifers can accelerate CO₂ dissolution and increase the safety of CO₂ storage. However, the hydrodynamic effect may interfere with the development of CO₂ plumes, affecting indirectly the actual storage capacity of the aquifer, to which available engineering solution remain very limited. We studied the potential water injection strategies and the influence of key operational parameters on the storage safety and capacity during CO₂ injection using a single well in an open saline aquifer. Results show that continuous water injection above the gas injection layer after a certain period could enhance significantly the storage intensity and increase the capacity. The early the water injection starts, the better the results. The storage capacity increases with the increase in water injection rate during gas injection. The temporal effect of water injection post gas injection on storage capacity needs to be evaluated case by case. Under a given total water injection volume, high-rate water injection during gas injection is more effective to enhance the storage capacity than low-rate and prolonged water injection. Reducing the spatial interval between the water injection layer and gas injection layer could enhance the actual storage capacity. Meanwhile, water injection could effectively reduce the CO₂ saturation near the injection well, and mitigate the risk of wellbore leakage.
- CO₂ geological storage /
- water injection /
- storage capacity /
- storage safety /
- operational parameters

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References

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