Influence of supercritical CO2 on the physical property of tight sandstone

Peng, Huan; Yang, Jian; Peng, Jun; Han, Hu; Gou, Xinghao; Jia, Yucheng; Li, Yibo; Varfolomeev, Mikhail A.

doi:10.1016/j.petlm.2022.10.003

Cited by 5 publications

(3 citation statements)

References 41 publications

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“…Figure 7(D) displays the variation of calculated CO 2 permeability before and after the CO 2 –water–rock interaction, revealing a decrease in CO 2 permeability after the interaction. The interaction between CO 2 ‐water and rock can theoretically result in rock erosion, enhancing porosity and permeability 25 . However, the flow of CO 2 ‐water and its interaction with the rock can also result in the movement of fines and dissolved minerals.…”

Section: Resultsmentioning

confidence: 99%

“…The interaction between CO 2 -water and rock can theoretically result in rock erosion, enhancing porosity and permeability. 25 However, the flow of CO 2 -water and its interaction with the rock can also result in the movement of fines and dissolved minerals. The precipitation of dissolved minerals and the blockage of pore throats by fine particles can reduce permeability.…”

Section: Co 2 Flooding Characteristics After the Co 2 -Water-rock Int...mentioning

confidence: 99%

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Experimental study on the flow characteristics of supercritical CO₂ in reservoir sandstones from the Ordos Basin, China

Zhu,

Chen,

et al. 2023

Greenhouse Gases

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Understanding the flow characteristics of supercritical CO2 in dry sandstones or those with low water content provides crucial information on the flow behavior in near‐wellbore zone. We conducted supercritical CO2 core flooding experiments using sandstone cores extracted from potential CO2 reservoirs in the Ordos Basin, China. During the experiments, we reduced the water content of saturated cores by flushing with dry CO2 and subsequently vacuumizing them at a temperature of 35°C to simulate sandstones with low water content. The experimental results demonstrate that the CO2 permeability was initially high during the low differential pressure stage and remained constant as the differential pressure increased. In the carbonic acid solution injection experiment, we observed an increase in the flow rate of the solution with the continuous interaction in the cores from the Shanxi and Shihezi groups, while the Yanchang group exhibited the opposite effect. This increase in permeability can be attributed to mineral dissolution and the loss of fine particles. Conversely, the blockage of fine particles or the precipitation of dissolved minerals may lead to a decrease in permeability. After the CO2–water–rock interaction, the CO2 permeability decreased compared to before the interaction, indicating that adsorbed water, the precipitation of dissolved mineral, or pore throat blockage by fine particles could induce this permeability decrease. The impact of adsorbed water on the decrease in CO2 permeability is significant. Additionally, the CO2–water–rock interaction caused corrosion on the anorthite surface. Furthermore, calcite dispersed in connected pores displayed a more pronounced dissolution compared to cemented calcite. © 2023 Society of Chemical Industry and John Wiley & Sons, Ltd.

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Section: Resultsmentioning

confidence: 99%

Section: Co 2 Flooding Characteristics After the Co 2 -Water-rock Int...mentioning

confidence: 99%

Experimental study on the flow characteristics of supercritical CO₂ in reservoir sandstones from the Ordos Basin, China

Zhu,

Chen,

et al. 2023

Greenhouse Gases

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“…This leads to the enhancement of subcritical crack extension and a reduction in rock strength [18,19]. Zhou et al [20] analyzed the physical characteristics of loose sandstone reservoirs under lower supercritical CO 2 pressure and discovered that supercritical CO 2 under low pressure conditions reduced the permeability of sandstone reservoirs. Liang et al [21] studied sandstone after soaking in supercritical CO 2 for different lengths of time, which had a significant weakening effect on the mechanical properties of the top sandstone.…”

Section: Introductionmentioning

confidence: 99%

Study on Microscopic Characteristics and Rock Mechanical Properties of Tight Sandstone after Acidification–Supercritical CO2 Composite Action: Case Study from Xujiahe Formation, China

Zhao,

Huang,

Liang

et al. 2024

Applied Sciences

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Acidified CO2 fracturing is a viable method for increasing production in deep, tight sandstone reservoirs. However, the potential mechanism of changes in pore structure and mechanical properties of sandstone under acidified CO2 supercritical composite is not clear. Understanding this mechanism is important for the study of crack initiation and extension in tight sandstone reservoirs. This study utilizes sandstone samples from the Xujiahe Formation reservoir in Rongchang District as experimental specimens. The primary focus is to analyze the changes in pore structure and mechanical properties of these samples after acidification–supercritical CO2 composite action. Nuclear magnetic resonance (NMR) and uniaxial compression tests are employed as the main investigative techniques. The results show that there was a physicochemical synergy between the acidification–supercritical CO2 composite effect; the crack initial stress, damage stress, and peak stress of the sandstone after 16 MPa supercritical CO2 acidification treatment were reduced by 20%, 49.5%, and 49.8%, respectively; the crack volumetric strain accelerated and the sandstone evolved from brittle to ductile damage; and the larger pore space and microcracks of the sandstone increased significantly after the treatment, which can be attributed to the gradual dissolution of intergranular cement leading to the formation of new pores connected to the existing pore network. The change mechanism of sandstone after acidification–supercritical CO2 compound treatment is also proposed.

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Investigation of influence factors on CO2 flowback characteristics and optimization of flowback parameters during CO2 dry fracturing in tight gas reservoirs

Zhou

Sun

et al. 2023

Petroleum Science

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Influence of supercritical CO2 on the physical property of tight sandstone

Cited by 5 publications

References 41 publications

Experimental study on the flow characteristics of supercritical CO₂ in reservoir sandstones from the Ordos Basin, China

Experimental study on the flow characteristics of supercritical CO₂ in reservoir sandstones from the Ordos Basin, China

Study on Microscopic Characteristics and Rock Mechanical Properties of Tight Sandstone after Acidification–Supercritical CO2 Composite Action: Case Study from Xujiahe Formation, China

Investigation of influence factors on CO2 flowback characteristics and optimization of flowback parameters during CO2 dry fracturing in tight gas reservoirs

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Influence of supercritical CO2 on the physical property of tight sandstone

Cited by 5 publications

References 41 publications

Experimental study on the flow characteristics of supercritical CO2 in reservoir sandstones from the Ordos Basin, China

Experimental study on the flow characteristics of supercritical CO2 in reservoir sandstones from the Ordos Basin, China

Study on Microscopic Characteristics and Rock Mechanical Properties of Tight Sandstone after Acidification–Supercritical CO2 Composite Action: Case Study from Xujiahe Formation, China

Investigation of influence factors on CO2 flowback characteristics and optimization of flowback parameters during CO2 dry fracturing in tight gas reservoirs

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Experimental study on the flow characteristics of supercritical CO₂ in reservoir sandstones from the Ordos Basin, China

Experimental study on the flow characteristics of supercritical CO₂ in reservoir sandstones from the Ordos Basin, China