Mechanisms of shale water wettability alteration with chemical groups after CO2 injection: Implication for shale gas recovery and CO2 geo-storage

Lu, Yiyu; Tian, Rongrong; Liu, Wenchuan; Tang, Jiren; Li, Honglian; Chen, Xiayu; Sun, Xiao Fei

doi:10.1016/j.jngse.2021.103922

Cited by 37 publications

(23 citation statements)

References 68 publications

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“…Due to the action of ScCO 2 , the types and distribution of these functional groups on the surface were changed. Since the ratio of the Si–OH groups to the Si–O–Si groups decreases after long-term ScCO 2 treatment, more Si–O groups are derived from the hydrophobic Si–O–Si than the hydrophilic Si–OH, weakening their contribution to the water wettability of shale. In addition, the three oxygen atoms of CO 3 2– groups may interact with the surrounding water molecules, forming H-bonds .…”

Section: Resultsmentioning

confidence: 99%

“…Therefore, it is of great significance to study shale wettability at different CO 2 temperatures and pressures. Our previous study only investigated the effect of CO 2 pressure on shale wettability, and we found that the shale hydrophilicity weakened with increasing pressure. The comprehensive effects of temperature and pressure on shale wettability during shale–CO 2 interactions are investigated in this paper since this topic has not yet been analyzed to date.…”

Section: Introductionmentioning

confidence: 94%

“…During CO 2 -ESGR, water molecules enter the hydrophilic pores in the shale formation, but they cannot access pores freely . Therefore, blocking of the pore channels and adsorption sites results in reduced gas adsorption, diffusion, percolation, and permeability. , Water blocking also occurs, impairing the flow of gas and CO 2 in the shale reservoir and reducing shale gas productivity. , Regarding CO 2 geological storage, in water-wet shale, water readily adheres to the surface of the pores and fractures to form a water film, which is conducive to the formation of CO 2 traps, enabling CO 2 geological storage. Chiquet et al confirmed that a reduction in the water wettability was detrimental to CO 2 underground storage because it reduced the CO 2 breakthrough pressure in the caprock.…”

Section: Introductionmentioning

confidence: 99%

“…16,17 Water blocking also occurs, impairing the flow of gas and CO 2 in the shale reservoir and reducing shale gas productivity. 18,19 Regarding CO 2 geological storage, in water-wet shale, water readily adheres to the surface of the pores and fractures to form a water film, which is conducive to the formation of CO 2 traps, enabling CO 2 geological storage. Chiquet et al 20 confirmed that a reduction in the water wettability was detrimental to CO 2 underground storage because it reduced the CO 2 breakthrough pressure in the caprock.…”

Section: Introductionmentioning

confidence: 99%

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Investigating the Mineralogical and Chemical Effects of CO₂ Injection on Shale Wettability at Different Reservoir Temperatures and Pressures

Tian

Tang

et al. 2021

Energy Fuels

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The wettability of shale, which determines the success of carbon dioxide-enhanced shale gas recovery (CO 2 -ESGR) and the safety of CO 2 geo-storage, is influenced due to shale−CO 2 chemical interactions. To date, the wettability alteration mechanism of shale by its surficial chemical groups is not well understood. In this study, the variations in the wettability, mineralogy, and infrared spectrum of shale after interaction with CO 2 at different temperatures and pressures were studied using the sessile drop method, X-ray diffraction, and Fourier transform infrared spectroscopy analysis. The effect of the contents of minerals and chemical groups on shale wettability was investigated by correlation analysis. It is found that the pressure of CO 2 has a larger influence on shale wettability than the temperature, whereas the temperature has a greater effect on the infrared spectra of shale. Quartz has the greatest effect on wettability followed by carbonate and clay minerals. Quartz is originally water-wet, and the negative correlation between the relative quartz content and the wettability of shale implies the deterioration of the quartz hydrophilicity after CO 2 treatment, and the same applies to the oxygen-containing groups. These findings indicate the interactions among functional groups and their redistribution on the surface during shale−CO 2 interactions. Si−O groups are derived more from the hydrophobic Si−O−Si groups than hydrophilic Si−OH groups after CO 2 treatment, reducing the contribution of quartz to shale hydrophilicity. The weakened absorption ability of CO 3 2− ions to water may be caused by the rotation and redistribution of the CO 3 2− groups on the surface after the CO 2 treatment. A longer aliphatic hydrocarbon length reduces the shale wettability. Among the hydrophilic −OH groups, free −OH has the largest influence on shale wettability followed by −OH−O, −OH−OH, and −OH−Π. This study has important theoretical significance for understanding the wettability alteration mechanism of shale.

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Section: Resultsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 94%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Investigating the Mineralogical and Chemical Effects of CO₂ Injection on Shale Wettability at Different Reservoir Temperatures and Pressures

Tian

Tang

et al. 2021

Energy Fuels

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“…For example, Lu et al used hydraulic fracturing to increase the permeability of coal seams for the improvement of methane drainage in underground coal mines. 19 To address the problem of extension direction of coal seam hydraulic fracturing, Zhai et al analyzed the course of fracture variation around the boreholes in the process of hydraulic fracturing. 20 The above studies indicate that hydraulic fracturing proved successful in improving the permeability of coal seams.…”

Section: Introductionmentioning

confidence: 99%

Dynamic Effect of Shaped Charge Blasting and Its Application in Coal Seam Permeability Enhancement

et al. 2022

ACS Omega

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The dynamic effect of shaped charge blasting and its application in coal seam permeability enhancement have been investigated. Comparative experiments of shaped charge blasting and conventional blasting to fracture the concrete are carried out. Then, the propagation characteristics of explosion stress waves under shaped charge blasting and conventional blasting are analyzed by ANSYS/LS-DYNA. Finally, the fracture mechanical model of shaped charge blasting is established. The experimental results show that the width of the four main cracks formed after conventional blasting is 0.3 cm, while the width of the cracks in the energy accumulation direction after shaped charge blasting is 1.1 cm and the width of that in the vertical energy accumulation direction is 0.4 cm. The numerical simulation results show that the crushing area after shaped charge blasting is “dumbbell type”, and the area is smaller than that of conventional blasting. However, the cracking area is “spindle type”, and the development of the fracture degree is better than that of conventional blasting. In addition, shaped charge blasting is used to improve the permeability of coal seams. The results show that shaped charge blasting effectively improves the permeability and gas extraction rate of coal seams.

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Long short-term memory suggests a model for predicting shale gas production

Yang

Liu²,

Yu³

et al. 2022

Applied Energy

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Mechanisms of shale water wettability alteration with chemical groups after CO2 injection: Implication for shale gas recovery and CO2 geo-storage

Cited by 37 publications

References 68 publications

Investigating the Mineralogical and Chemical Effects of CO₂ Injection on Shale Wettability at Different Reservoir Temperatures and Pressures

Investigating the Mineralogical and Chemical Effects of CO₂ Injection on Shale Wettability at Different Reservoir Temperatures and Pressures

Dynamic Effect of Shaped Charge Blasting and Its Application in Coal Seam Permeability Enhancement

Long short-term memory suggests a model for predicting shale gas production

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Mechanisms of shale water wettability alteration with chemical groups after CO2 injection: Implication for shale gas recovery and CO2 geo-storage

Cited by 37 publications

References 68 publications

Investigating the Mineralogical and Chemical Effects of CO2 Injection on Shale Wettability at Different Reservoir Temperatures and Pressures

Investigating the Mineralogical and Chemical Effects of CO2 Injection on Shale Wettability at Different Reservoir Temperatures and Pressures

Dynamic Effect of Shaped Charge Blasting and Its Application in Coal Seam Permeability Enhancement

Long short-term memory suggests a model for predicting shale gas production

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Product

Resources

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Investigating the Mineralogical and Chemical Effects of CO₂ Injection on Shale Wettability at Different Reservoir Temperatures and Pressures

Investigating the Mineralogical and Chemical Effects of CO₂ Injection on Shale Wettability at Different Reservoir Temperatures and Pressures