Research Article
Study on the Transport and Transformation Law of CO2 Marine Storage in Reservoirs with Various Permeability Anisotropy
Yongqiang Xia,
Peng Gao,
Zhibo Jiang,
Qi Fan,
Rupeng Wei,
Qingping Li,
Lunxiang Zhang,
Tao Yu,
Lei Yang*,
Yongchen Song
Issue:
Volume 12, Issue 2, April 2024
Pages:
20-26
Received:
12 March 2024
Accepted:
29 March 2024
Published:
12 April 2024
Abstract: There is an international consensus to reduce the pace of global warming caused by greenhouse gases, such as CO2.The geological storage of CO2 plays a crucial role in reducing the atmospheric CO2 concentration, and hydrate-based CO2 storage is an important geological storage technology applied to seabed sediments, which has attracted increasing attention due to its advantages of high safety and large storage capacity. In this study, a large-scale numerical simulator applicable to CO2 hydrate storage is developed, which considers the two-phase flow process including hydrate formation and realizes the coupling of the thermal-fluidic-chemical three fields, and further investigates the transport and transformation behavior of CO2 in the reservoir with anisotropic permeability during the injection period and at the cessation of injection. The results show that the formation of CO2 hydrate can easily generate local high-pressure zones and local high-temperature zones inside the reservoir; the CO2 hydrate cap formed above the wellhead can limit the vertical transport distance of CO2 and ensure the safe storage of CO2. In addition, this study also analyzed the efficiency of CO2 hydrate storage in different permeability anisotropic reservoirs and found that high Khv reservoirs are more conducive to CO2 conversion in the long term. This study can provide scientific value for the hydrate-based CO2 storage in the ocean and a theoretical basis for the transport behavior of CO2 in submarine reservoirs.
Abstract: There is an international consensus to reduce the pace of global warming caused by greenhouse gases, such as CO2.The geological storage of CO2 plays a crucial role in reducing the atmospheric CO2 concentration, and hydrate-based CO2 storage is an important geological storage technology applied to seabed sediments, which has attracted increasing att...
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Research Article
Study on the Effect of Clay Minerals on CO2 Hydrate Formation
Yuze Han,
Yu Feng,
Yang Ge,
Qingping Li,
Lei Yang*,
Lunxiang Zhang,
Yongchen Song
Issue:
Volume 12, Issue 2, April 2024
Pages:
27-32
Received:
12 March 2024
Accepted:
29 March 2024
Published:
12 April 2024
Abstract: With the massive emission of greenhouse gases, global warming has become an important challenge for human beings at present. Storing carbon dioxide in the form of solid hydrates in the ocean is an effective strategy to mitigate climate warming. Clay in the ocean may have an effect on hydrate formation and CO2 storage. In this study, montmorillonite and kaolinite were selected as clay minerals, and the effects of clay particles on CO2 hydrate formation in suspensions with different mass fractions were experimentally analyzed. The results showed that the clay particles were able to promote hydrate nucleation and shorten the induction time, but the final amount of hydrate was reduced, which was related to the bound water. CO2 hydrate storage in clay minerals with different water contents was investigated. The amount of CO2 storage in montmorillonite minerals first decreased and then increased with the increase of water content, while the amount of storage in kaolinite minerals increased. The reason was that the amount of bound water on the surfaces of montmorillonite and kaolinite was different, and the stronger bound water was difficult to form hydrates. The results revealed the effect of clay particles on CO2 hydrate formation and provided some experimental support for the CO2 storage by hydrate method in the ocean.
Abstract: With the massive emission of greenhouse gases, global warming has become an important challenge for human beings at present. Storing carbon dioxide in the form of solid hydrates in the ocean is an effective strategy to mitigate climate warming. Clay in the ocean may have an effect on hydrate formation and CO2 storage. In this study, montmorillonite...
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Research Article
Verification Test and Research on Fitting Curve of Shear and Tensile Synthesis Method
Issue:
Volume 12, Issue 2, April 2024
Pages:
33-40
Received:
3 March 2024
Accepted:
29 March 2024
Published:
12 April 2024
Abstract: Based on the recommended curve of concrete compressive strength tested by shear and tensile composite method, this paper combined with concrete specimens of different strength grades, ages and batches produced by several test verification units, adopted the in vitro shear and tensile test method introduced by the regulations, and used basically the same test equipment to collect the single shear and tensile strength and the compressive strength of cube specimens under the same conditions. Each batch was divided into 15 or 30 specimens. Through the collected test data, the conversion strength of the single shear, pull-out and shear tensile composite methods were calculated respectively. The relative error of a single specimen was calculated based on the average strength of each batch of concrete. The error distribution types and errors of each company were systematically studied, and finally the relative error data of each company were summarized, and the probability distribution parameters of the error of the Shear and tensile synthesis method were understood through probability distribution analysis, and the relationship between the error of the shear and tensile synthesis method, the single shear method and the pull method, and the influence degree on the conversion strength of the shear and tensile synthesis method were shown by using three-dimensional coordinates. Using the test data of "shear and tensile synthesis method", "single shear method" and "pull-out method", the scatter plot is drawn, and the error size is compared to explore the direction of further improving the detection accuracy of "shear and tensile synthesis method".
Abstract: Based on the recommended curve of concrete compressive strength tested by shear and tensile composite method, this paper combined with concrete specimens of different strength grades, ages and batches produced by several test verification units, adopted the in vitro shear and tensile test method introduced by the regulations, and used basically the...
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Guo Qing
