Supercritical CO<sub>2</sub> fracturing with different drilling depths in shale

Yang, Hongwei; Zhao, Yuan; Zhang, Xinghua; Liu, Guojun; Du, Xidong; Shang, Delei; Yu, Yang; Chen, Juan; Wang, Hui; Tu, Huaijian

doi:10.1080/15567036.2019.1673850

Cited by 9 publications

(9 citation statements)

References 40 publications

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“…The challenge lies in achieving uniform and rapid CO 2 heating. Furthermore, due to CO 2 strong penetrability, equipment must possess high sealing and antipuncture capabilities. ,− Pressure and temperature control: The maintenance of the supercritical state of CO 2 , which is a highly compressed fluid, requires careful control of temperature and pressure . Especially in deep shale formations where temperature and pressure can vary dramatically, this can be challenging to accomplish. ,,,,,,,,,,, Process of fracture initiation and propagation: The process of fracturing with Sc-CO 2 is significantly different from conventional hydraulic fracturing.…”

Section: Prospects Current Challenges and Environmental Concernmentioning

confidence: 99%

Supercritical Carbon Dioxide Utilization for Hydraulic Fracturing of Shale Reservoir, and Geo-Storage: A Review

Gupta,

Verma

2023

Energy Fuels

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Hydraulic fracturing has completely revolutionized how shale resources are exploited to extracthydrocarbons. However, sustainability and environmental issues have fueled the desire for alternate fracturing technologies. Supercritical carbon dioxide (Sc-CO2) fracturing is a new method that uses high-pressure, high-temperature CO2 in its supercritical state (7.38 MPa and 31.1 °C) to generate fractures in shale formations, thereby increasing reservoir permeability. This Review thoroughly analyzes the effects of Sc-CO2 on shale reservoirs during the fracturing process, including the factors that affect fracture breakdown pressure and the complexity and roughness of fracture induced by Sc-CO2. Sc-CO2 can fracture rock at a fracturing pressure lower than that of slick water. CO2, in its supercritical state, shows strong permeability, low viscosity, and extremely low surface tension, like gas, because of which it can infiltrate any space larger than its kinetic diameter (0.330 nm). Many research investigations illustrate how Sc-CO2 affects shales with diverse pore structures, mineral compositions, and mechanical properties when exposed to Sc-CO2 for several hours to days. It is challenging to effectively store CO2 in shale gas reservoirs due to their low permeability and limited storage capacity. To improve the effectiveness of CO2 storage, shale can be fractured to increase the pore space and surface area in reservoirs. Thereby, a certain amount of the CO2 pumped for shale gas production can be securely stored in shale formations, reducing carbon emissions and allowing for a zero-carbon footprint. This paper discusses the pathway and different chemical reactions involved in the storage of CO2 after fracturing over a period. However, fully understanding the interactions between Sc-CO2 and shale rock and the possibility of long-term storage of CO2 in shale formations is quite challenging. It is because of a lack of research and limited knowledge in the above field. Hence, more investigation and development are required in the research area of Sc-CO2 fracturing and the interaction of CO2 with shale rock.

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Section: Prospects Current Challenges and Environmental Concernmentioning

confidence: 99%

Supercritical Carbon Dioxide Utilization for Hydraulic Fracturing of Shale Reservoir, and Geo-Storage: A Review

Gupta,

Verma

2023

Energy Fuels

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“…In experimental works [99,100], the authors have demonstrated that hydraulic fracturing using supercritical CO 2 can create three-dimensional sinuous fractures with a large number of secondary branches. A model of thermal effects during hydraulic fracturing using supercritical carbon dioxide was developed in [14].…”

Section: Using Scf For Hydraulic Fracturingmentioning

confidence: 99%

“…According to the developed methodology, the authors concluded that supercritical CO 2 had up to 4.4 times greater fracture capacity, and could create fractures up to 2.6 times more complex and 23.4% more tortuous than water-based hydraulic fracturing (Figure 7). The authors of the article [99] conducted experimental studies of hydraulic fracturin of a shale formation with supercritical carbon dioxide, depending on the drilling depth o a well. In addition, the morphology of cracks was analyzed using computed tomography As a result, it was found that the rupture pressure decreases with the depth of drilling.…”

Section: Using Scf For Hydraulic Fracturingmentioning

confidence: 99%

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Supercritical Fluid Application in the Oil and Gas Industry: A Comprehensive Review

et al. 2022

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The unique properties of supercritical fluid technology have found wide application in various industry sectors. Supercritical fluids allow for the obtainment of new types of products with special characteristics, or development and design of technological processes that are cost-effective and friendly to the environment. One of the promising areas where supercritical fluids, especially carbon dioxide, can be used is the oil industry. In this regard, the present review article summarizes the results of theoretical and experimental studies of the use of supercritical fluids in the oil and gas industry for supercritical extraction in the course of oil refining, increasing oil recovery in the production of heavy oil, hydraulic fracturing, as well as processing and disposal of oil sludge and asphaltenes. At the end of the present review, the issue of the impact of supercritical fluid on the corrosion of oil and gas equipment is considered. It is found that supercritical fluid technologies are very promising for the oil industry, but supercritical fluids also have disadvantages, such as expansion or incompatibility with materials (for example, rubber).

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“…Cipolla et al [15,16] established their respective mathematical models for determining the generation of complex fractures to understand the mechanism of fracture propagation. Yang et al [17] carried out different tests under uniaxial and biaxial compression conditions; the crack propagation processes under different loading conditions were analyzed in the data. Li et al [18] and Huang et al [19] observed the great influence of coal cleats and nature fractures on the propagation paths of hydraulic fractures.…”

Section: Introductionmentioning

confidence: 99%

Experimental Study on Crack Extension Rules of Hydraulic Fracturing Based on Simulated Coal Seam Roof and Floor

et al. 2022

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Hydraulic fracturing can increase the fracture of coal seams, improve the permeability in the coal seam, and reduce the risk of coal and gas outburst. Most of the existing experimental specimens are homogeneous, and the influence of the roof and floor on hydraulic fracture expansion is not considered. Therefore, the hydraulic fracturing test of the simulated combination of the coal seam and the roof and floor under different stress conditions was carried out using the self-developed true triaxial coal mine dynamic disaster large-scale simulation test rig. The results show that (1) under the condition of triaxial unequal pressure, the hydraulic fractures are vertical in the coal seam, and the extension direction of hydraulic fractures in the coal seam will be deflected, with the increase of the ratio of the horizontal maximum principal stress to the horizontal minimum principal stress. The angle between the extension direction of the hydraulic fracture and the horizontal maximum principal stress decreases. (2) Under the condition of triaxial equal confining pressure, the extension of hydraulic fractures in the coal seam are random, and the hydraulic fracture will expand along the dominant fracture surface and form a unilateral expansion fracture when a crack is formed. (3) When the pressure in one direction is unloaded under the condition of the triaxial unequal pressure, the hydraulic fractures in the coal seam will reorientate, and the cracks will expand in the direction of the decreased confining pressure, forming almost mutually perpendicular turning cracks.

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Supercritical CO₂ fracturing with different drilling depths in shale

Cited by 9 publications

References 40 publications

Supercritical Carbon Dioxide Utilization for Hydraulic Fracturing of Shale Reservoir, and Geo-Storage: A Review

Supercritical Carbon Dioxide Utilization for Hydraulic Fracturing of Shale Reservoir, and Geo-Storage: A Review

Supercritical Fluid Application in the Oil and Gas Industry: A Comprehensive Review

Experimental Study on Crack Extension Rules of Hydraulic Fracturing Based on Simulated Coal Seam Roof and Floor

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Supercritical CO2 fracturing with different drilling depths in shale

Cited by 9 publications

References 40 publications

Supercritical Carbon Dioxide Utilization for Hydraulic Fracturing of Shale Reservoir, and Geo-Storage: A Review

Supercritical Carbon Dioxide Utilization for Hydraulic Fracturing of Shale Reservoir, and Geo-Storage: A Review

Supercritical Fluid Application in the Oil and Gas Industry: A Comprehensive Review

Experimental Study on Crack Extension Rules of Hydraulic Fracturing Based on Simulated Coal Seam Roof and Floor

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Supercritical CO₂ fracturing with different drilling depths in shale