Numerical Investigation of the Influences of Wellbore Flow on Compressed Air Energy Storage in Aquifers

Li, Yang; Zhang, Keni; Hu, Litang; Wang, Jinsheng

doi:10.1155/2017/9316506

Cited by 6 publications

(3 citation statements)

References 23 publications

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“…Well configuration can also affect the performance of a reservoir. Li et al [93] investigated the influences of the well screen length on CAESA system performance using an integrated wellbore-reservoir simulator (T2WELL [94]). Results showed that the well screen length can affect the distribution of the initial gas bubble.…”

Section: Well Configurationmentioning

confidence: 99%

The promise and challenges of utility-scale compressed air energy storage in aquifers

Guo

Zhang

et al. 2021

Applied Energy

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Section: Well Configurationmentioning

confidence: 99%

The promise and challenges of utility-scale compressed air energy storage in aquifers

Guo

Zhang

et al. 2021

Applied Energy

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“…Simulations considering the impact of storage formation depth on operational efficiency found that deeper target formations increased efficiency due to higher storage densities and surrounding working temperatures. 48,49 In general, the density of the working phase will increase with depth (Figure 2) where CO 2 has the highest density in comparison with other potential working phases. In terms of surrounding working temperatures, rock grains in aquifers have a larger specific heat than air, resulting in smaller temperature variations in the system and an anticipated increase in efficiency for storage in porous formations versus salt caverns.…”

Section: ■ Storage Capacitymentioning

confidence: 99%

Critical Knowledge Gaps for Understanding Water–Rock–Working Phase Interactions for Compressed Energy Storage in Porous Formations

Beckingham

Winningham

2019

ACS Sustainable Chem. Eng.

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Storage of air or compressed gas in porous formations is a promising means of large-scale, long-term energy storage, but salt caverns have predominantly been used for storage to date. Porous formations are ubiquitous and have high capacities but introduce new, complex water−rock−working phase interactions due to their greater depths, variable pressure, and saturation with saline brines. Extensive work in the context of geologic sequestration in porous formations has advanced understanding of these interactions and can be leveraged to assess energy storage systems. However, key differences in these systems need to be considered, notably the range of possible working phases (hydrogen, CO 2 , air, methane, and gas mixtures) and cyclic injection−extraction flow patterns. Recent advancements in understanding of water−rock−working phase interactions in the context of geologic CO 2 sequestration have illuminated the need to understand the properties of the working gas under storage conditions to accurately assess storage capacity and the relative permeability and capillary pressure to assess injectivity and operational efficiency. Following injection, geochemical interactions between the working gas and formation brine and minerals can change formation and caprock properties that impact operational and storage security but have largely not been considered in energy storage systems.

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“…The impact of air confinement on the water infiltration process can be significant for a number of natural conditions [15][16][17]. As reported in Slater and Byers [15], for a finegrained soil underlain by an impervious rock or clay, the rainfall might seal the surface soil and further resist the air escape.…”

Section: Introductionmentioning

confidence: 99%

Experimental Study of Water Infiltration in Unsaturated Horizontal Sand Columns under Various Air Confinement Conditions

et al. 2019

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The process of water infiltration into initially dry sand was studied in horizontal sand columns under various airtight conditions. To investigate the interrelations among water inflow behavior, air pressure, air confinement effect, and vent effectiveness in unsaturated porous media experiencing dynamic infiltration, a total of five dynamic infiltration experiments with fixed inlet water pressure were performed with different air vents open or closed along the column length. Visualizations of the infiltration process were accompanied by measurements of water saturation, air pressure, and accumulated water inflow. In a column system with an open end, the absence of air pressure buildup reveals that the vent at the column end can significantly reduce the internal air pressure effects during infiltration, and the air phase can be ignored for this case. However, in columns with a tight end, the coupled air and water flow processes can be divided into two completely different periods. Before the water front passed by the most distant open vent, the internal air pressure effects on retarding dynamic infiltration are negligible, similar to the open end case. After this period, the open vents can certainly influence the inflow behavior by functioning as air outlets while they cannot equilibrate pore air pressure with the atmospheric pressure. The remaining air ahead of the front will be gradually confined and compressed, and the significant increase in air pressure highlights the great role of air pressure buildup in reducing the water infiltration rate. The closer the last open vent was to the water inlet, the higher was the increase in air pressure and the greater was the delaying effect on water infiltration. This work may extend the experimental study of water infiltration into the unsaturated soils with different airtight conditions and provide experimental evidence on these coupled mechanisms among the water and air phases in soils.

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Numerical Investigation of the Influences of Wellbore Flow on Compressed Air Energy Storage in Aquifers

Cited by 6 publications

References 23 publications

The promise and challenges of utility-scale compressed air energy storage in aquifers

The promise and challenges of utility-scale compressed air energy storage in aquifers

Critical Knowledge Gaps for Understanding Water–Rock–Working Phase Interactions for Compressed Energy Storage in Porous Formations

Experimental Study of Water Infiltration in Unsaturated Horizontal Sand Columns under Various Air Confinement Conditions

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