Study on Field-scale of CO2 Geological Storage Combined with Saline Water Recovery: A Case Study of East Junggar Basin of Xinjiang

CO2 geological storage (CGS) proved to be an enormously significant mid-to-long-term solution for mitigating and even nullifying the net greenhouse gas emissions, and CO2-enhanced water recovery (CO2-EWR) technology may improve the efficiency of CO2 injection and saline water production with potential economic value as a means of storing CO2 and supplying cooling water to power plants. The strata with dip-angle are common in nature, because of the effects of geological structure and diagenesis. It is of great significance to study the influence of the dip-angle on the efficiency and safety of CO2-EWR. Based upon the typical formation parameters of the China Geological Survey CO2-EWR test site in the eastern Junggar Basin, a series of three-dimensional (3D) injection-extraction models with fully coupled wellbores and reservoirs were established to evaluate the effect of dip-angle on the enhanced efficiency of CO2 storage and saline production, considering geochemical reactions. Numerical simulation results show that the dip-angle has a regular influence on the formation pressure field, the CO2 transport distance in the reservoir and the CO2 sealing capacity, and the influence of dip-angle strata on the total storage amount of CO2 changed in a non-monotone mode compared with the CO2 geological storage in horizontal strata at the same injection condition. The effect of water chemical characteristics on the migration of CO2 in different phases and the transformations of major sequestered carbon minerals were determined from the resulting mechanism. Because non-horizontal strata are predominant in deep saline aquifers in nature, regardless of the influence of formation dip, CO2 leakage risks in geological storage will be greatly underestimated, and the stratum dip angle must be considered in research related to CO2 geological storage. Overall, the results of analysis provide a guide and reference for the CO2-EWR site selection.

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Short-term safety risk assessment of CO2 geological storage projects in deep saline aquifers using the Shenhua CCS Demonstration Project as a case study

Environmental Earth Sciences ◽

10.1007/s12665-014-3928-8 ◽

2014 ◽

Vol 73 (11) ◽

pp. 7571-7586 ◽

Cited By ~ 17

Author(s):

Yujie Diao ◽

Senqi Zhang ◽

Yongsheng Wang ◽

Xufeng Li ◽

Hong Cao

Keyword(s):

Risk Assessment ◽

Demonstration Project ◽

Saline Aquifers ◽

Geological Storage ◽

Co2 Geological Storage ◽

Short Term ◽

Safety Risk ◽

Deep Saline Aquifers

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Use of a CO2 Geological Storage System to Develop Geothermal Resources: A Case Study of a Sandstone Reservoir in the Songliao Basin of Northeast China

Springer Series in Geomechanics and Geoengineering - Clean Energy Systems in the Subsurface: Production, Storage and Conversion ◽

10.1007/978-3-642-37849-2_8 ◽

2013 ◽

pp. 89-103

Author(s):

Yan Shi ◽

Fugang Wang ◽

Yanlin Yang ◽

Hongwu Lei ◽

Jin Na ◽

...

Keyword(s):

Northeast China ◽

Storage System ◽

Songliao Basin ◽

Geological Storage ◽

Co2 Geological Storage ◽

Geothermal Resources ◽

Sandstone Reservoir

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A Study on the CO2-Enhanced Water Recovery Efficiency and Reservoir Pressure Control Strategies

Geofluids ◽

10.1155/2019/6053756 ◽

2019 ◽

Vol 2019 ◽

pp. 1-17 ◽

Cited By ~ 2

Author(s):

Zhijie Yang ◽

Tianfu Xu ◽

Fugang Wang ◽

Yujie Diao ◽

Xufeng Li ◽

...

Keyword(s):

Saline Water ◽

Control Strategies ◽

Production Capacity ◽

Junggar Basin ◽

Pressure Control ◽

Reservoir Pressure ◽

Water Recovery ◽

Water Production ◽

Well Spacing ◽

Production Wells

CO2 geological storage (CGS) proved to be an effective way to mitigate greenhouse gas emissions, and CO2-enhanced water recovery (CO2-EWR) technology may improve the efficiency of CO2 injection and saline water production with potential economic value as a means of storing CO2 and supplying cooling water to power plants. Moreover, the continuous injection of CO2 may cause a sharp increase for pressure in the reservoir system, so it is important to determine reasonable reservoir pressure control strategies to ensure the safety of the CGS project. Based upon the typical formation parameters of the China Geological Survey CO2-EWR test site in the eastern Junggar Basin, a series of three-dimensional (3D) injection-extraction models with fully coupled wellbores and reservoirs were established to evaluate the effect of the number of production wells and the well spacing on the enhanced efficiency of CO2 storage and saline production. The optimal key parameters that control reservoir pressure evolution over time are determined. The numerical results show that a smaller spacing between injection and production wells and a larger number of production wells can enhance not only the CO2 injection capacity but also the saline water production capacity. The effect of the number of production wells on the injection capacity and production capacity is more significant than that of well spacing, and the simulation scenario with 2 production wells, one injection well, and a well spacing of 2 km is more reasonable in the demonstration project of Junggar Basin. CO2-EWR technology can effectively control the evolution of the reservoir pressure and offset the sharp increase in reservoir pressure caused by CO2 injection and the sharp decrease of reservoir pressure caused by saline production. The main controlling factors of pressure evolution at a certain spatial point in a reservoir change with time. The monitoring pressure drops at the beginning and is controlled by the extraction of water. Subsequently, the injection of CO2 plays a dominant role in the increase of reservoir pressure. Overall, the results of analysis provide a guide and reference for the CO2-EWR site selection, as well as the practical placement of wells.

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