Experimental Investigation on the Fractures Induced by Hydraulic Fracturing Using Freshwater and Supercritical CO2 in Shale Under Uniaxial Stress

He, Jianming; Zhang, Yixiang; Li, Xiao; Wan, Xiaole

doi:10.1007/s00603-019-01820-w

Cited by 32 publications

(7 citation statements)

References 27 publications

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“…This implies that reservoir with scCO 2 -brine have the tendency to make pore surface become wavy under stress, which could be because scCO 2 has a higher density compared to gCO 2, and scCO 2 dissolve edges of organic materials more easily (Chitanvis et al 1998). Similarly, He et al (2019) observed from their hydraulic fracturing experiment that scCO 2 creates more complex fracture and micro-cracks.…”

Section: Pore Surface Flatnessmentioning

confidence: 99%

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Effect of CO2 Phase on Pore Geometry of Saline Reservoir Rock

et al. 2022

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The phase of CO2 present in a saline reservoir influences the change of the pore geometry properties of reservoir rocks and consequently the transport and storage integrity of the reservoir. In this study, digital rock physics was used to evaluate pore geometry properties of rocks saturated with the different phaseCO2-brine under reservoir conditions. The changes in the pore geometry properties due to the different phaseCO2-brine-rock interaction were quantified. In addition to compression, CO2-brine-rock interaction caused a further reduction in porosity by precipitation. Compared to the dry sample, the porosity of the gaseous CO2-br sample was reduced the most, and was lower by 15% after saturation and compression. There was reduction in the pre-compression porosity after compression for all the samples, however, the reduction was highest in the gaseous CO2-br-saturated sample (13%). The flatness of pore surfaces was reduced, and pores became less rounded after compression, especially in supercritical CO2-br-saturated rock. The results from this research provide a valuable input to guide a robust simulation of CO2 storage in reservoir rocks where different phases of CO2 could be present.

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Section: Pore Surface Flatnessmentioning

confidence: 99%

“…Most researches on the effect of CO 2 on reservoir properties like Delle Piane and Sarout (2016), Pimienta et al (2017), He et al (2019), Isaka et al (2020) and Huang et al (2020) have assumed that CO 2 remains in a single-phase throughout the storage history. This assumption is not always true.…”

Section: Introductionmentioning

confidence: 99%

Effect of CO2 Phase on Pore Geometry of Saline Reservoir Rock

et al. 2022

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“…Natural gas resides within the organic shale as free gas, adsorbed gas, and to a small extent dissolved gas in the organic kerogen. Some researchers have proposed injecting CO 2 into organic-rich shale and making use of competitive adsorption to displace methane from the shale surface, a mechanism similar to that of enhanced CBM. − Another idea is to use supercritical CO 2 as the hydraulic fracturing fluid to reduce water consumption and water blockage near the producer. − If successful, such attempts can use a considerable amount of CO 2 for shale oil and gas production. However, these ideas are still in the early stage of research.…”

Section: Global Co2 Storage Capacity By Ccsmentioning

confidence: 99%

The Role of Carbon Capture and Storage in the Energy Transition

et al. 2021

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In this paper, we review and analyze the salient features of the ongoing energy transition from a high to a low carbon economy. Our analysis shows that this transition will require decarbonizing the power, transport, and industry sectors, and the transition pathway will be country-specific. Carbon capture and storage (CCS) technologies will play a major role in this energy transition by decarbonizing existing and new fossil fuel power plants and the production of low-carbon fossil-fuel-based blue hydrogen. Blue hydrogen can be used for hydrogen fuel cell mobility in the transport sector and heat and feedstock in the industry sector. Current estimates show that there is adequate CO2 storage capacity in the world’s saline aquifers and oil and gas reservoirs to store 2 centuries of anthropogenic CO2 emission. However, the slow pace of CCS implementation is concerning and is due, in part, to too low of an oil price to make CO2-enhanced oil recovery profitable, lack of financial incentives for CO2 geological storage, low public acceptance, lack of consistent government energy policy and CCS regulations, and high capital investment. We propose several ways to accelerate CCS implementation. Among others, they include establishing regional CCS corridors to make use of economy of scale, public CCS engagement, carbon pricing, and using public–private partnership for financing, technology transfer, and linking up different stakeholders.

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“…Clay minerals are very common in fine-grained sedimentary rocks and are usually strongly influenced by water, whereas ScCO 2 and clay minerals in shale do not react. He et al (2019) found that ScCO 2 is particularly suitable for fracturing shale with a high clay mineral content. The observations made using SEM of shale fractured after both water and ScCO 2 are shown in Fig.…”

Section: Mineral Compositionmentioning

confidence: 99%

Experimental Research on Supercritical Carbon Dioxide Fracturing of Sedimentary Rock: A Critical Review

Zheng

et al. 2023

Acta Geologica Sinica (Eng)

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Supercritical carbon dioxide (ScCO2) fracturing has great advantages and prospects in both shale gas exploitation and CO2 storage. This paper reviews current laboratory experimental methods and results for sedimentary rocks fractured by ScCO2. The breakdown pressure, fracture parameters, mineral composition, bedding plane angle and permeability are discussed. We also compare the differences between sedimentary rock and granite fractured by ScCO2, ultimately noting problems and suggesting solutions and strategies for the future. The analysis found that the breakdown pressure of ScCO2 was reduced 6.52%–52.31% compared with that of using water. ScCO2 tends to produce a complex fracture morphology with significantly higher permeability. When compared with water, the fracture aperture of ScCO2 was decreased by 4.10%–72.33%, the tortuosity of ScCO2 was increased by 5.41%–70.98% and the fractal dimension of ScCO2 was increased by 4.55%–8.41%. The breakdown pressure of sandstone is more sensitive to the nature of the fracturing fluid, but fracture aperture is less sensitive to fracturing fluid than for shale and coal. Compared with granite, the tortuosity of sedimentary rock is more sensitive to the fracturing fluid and the fracture fractal dimension is less sensitive to the fracturing fluid. Existing research shows that ScCO2 has the advantages of low breakdown pressure, good fracture creation and environmental protection. It is recommended that research be conducted in terms of sample terms, experimental conditions, effectiveness evaluation and theoretical derivation in order to promote the application of ScCO2 reformed reservoirs in the future.

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Experimental Investigation on the Fractures Induced by Hydraulic Fracturing Using Freshwater and Supercritical CO2 in Shale Under Uniaxial Stress

Cited by 32 publications

References 27 publications

Effect of CO2 Phase on Pore Geometry of Saline Reservoir Rock

Effect of CO2 Phase on Pore Geometry of Saline Reservoir Rock

The Role of Carbon Capture and Storage in the Energy Transition

Experimental Research on Supercritical Carbon Dioxide Fracturing of Sedimentary Rock: A Critical Review

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