Hydraulic Fracturing in Inada Granite and Ogino Tuff using Super Critical Carbon Dioxide and Water as Fracturing Fluids

Kizaki, Akihisa; Tanaka, Hironori; Sakaguchi, Kiyotoshi

doi:10.2473/journalofmmij.129.461

Cited by 25 publications

(13 citation statements)

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“…Many laboratory SC-CO 2 fracturing experiment results found that the fracture induced by SC-CO 2 had more branches along the main fracture, indicating that induced fracturing with a lower viscosity fluid forms a more complex fracture network in rocks. 26,27 Due to the fact that our research only focuses on SC-CO 2 and proppant transport, we simplified the fracture network to typical elements and modeled fractures as parallel planes, which has been done by many previous researchers. Based on the fracture parameters in the literature, we used simulation fractures for different geometries, which are shown in Fig.…”

Section: Geometrical Modelsmentioning

confidence: 99%

Numerical study of supercritical CO₂ and proppant transport in different geometrical fractures

Wang

Yang

et al. 2018

Greenhouse Gases

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Supercritical CO2 (SC‐CO2) fracturing, as a kind of waterless fracturing method, is an effective treatment in the unconventional oil and gas industry. Due to its characteristic lower viscosity, supercritical CO2 fracturing is likely to create thin and long fractures that connect pre‐existing natural fractures and generate complex fractures. It is therefore very challenging to predict how far supercritical CO2 carrying proppant can go and how proppant will be transported in natural fractures, when natural fractures are contacted or penetrated by induced fractures. In this paper, proppant transport with supercritical CO2 in fractures was analyzed using the computational fluid dynamics method. Three types of fractures – planar fractures, T‐shape fractures and crossing‐shape fractures – were modeled. Five parametrical cases were studied using the T‐shape and crossing‐shape models. Results show that, for T‐shape fracture cases, a turbulent flow regime might develop at a fracture junction, which can make proppant propagate to natural fractures. For crossing‐shape fractures, a turbulent flow takes place behind the fracture junction, which causes a little sand dune to form downstream of the induced fracture. With the reduction in the width of the natural fracture, the height of the sand bank at the thinner natural fracture is higher than that at the wider natural fracture. Using a proppant whose density and diameter are respectively less than 1540 kg/m3 and 0.25 mm, as well as a sand‐carrying fluid whose sand ratio ranges from 8% to 10% and injection rate exceeds 2 kg/s, is beneficial to prop natural fractures. Moreover, the larger the intersection angle of the crossing‐shape fracture is, the more difficult it is for proppant to enter natural fractures. This study reveals the influence of fracture geometry on proppant transport with SC‐CO2. © 2018 Society of Chemical Industry and John Wiley & Sons, Ltd.

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Section: Geometrical Modelsmentioning

confidence: 99%

Numerical study of supercritical CO₂ and proppant transport in different geometrical fractures

Wang

Yang

et al. 2018

Greenhouse Gases

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“…The injection of CO 2 into the subsurface saline formations at a depth more than 800 m has proven to be technically feasible in many countries, including the USA, Netherlands, Canada, Australia, China etc (Liu et al, 2017). The injected CO 2 can also be used to chemically reactive with the low permeability reservoir in order to increase the hydraulic con-ductivity (Kizaki et al, 2012), and to enhance the recovery of oil, natural gas, shale gas and geothermal energy (Liu et al, 2015;Singh, 2018;Zhou et al, 2019). The geological storage of CO 2 is mainly facilitated by means of several mechanisms, including structural or stratigraphic trapping, residual or capillary trapping, solubility trapping and mineral trapping (Metz et al, 2005;Parry et al, 2007;Benson and 420 Liu, H., et al Advances in Geo-Energy Research 2020, 4(4): 419-434 Cole, 2008;Chaudhary et al, 2013).…”

Section: Introductionmentioning

confidence: 99%

Pore-scale numerical simulation of supercritical CO2 migration in porous and fractured media saturated with water

Liu

Zhu

Were

et al. 2020

Adv. Geo-Energy Res.

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“…Therefore, SC-CO 2 jet fracturing, combining the advantages of both water hydraulic-jet fracturing and SC-CO 2 fluid, is proposed in order to increase shale gas production and lowered energy costs. Scientists have explored SC-CO 2 fracturing in shale reservoirs via numerical and experimental methods, respectively [10,11]. The results show that a larger number of fracture branches are created by SC-CO 2 than by water [1][2][3]11].…”

Section: Introductionmentioning

confidence: 99%

The Flow Characteristics of Supercritical Carbon Dioxide (SC-CO2) Jet Fracturing in Limited Perforation Scenarios

et al. 2020

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Supercritical carbon dioxide (SC-CO2) jet fracturing is a promising alternative for shale gas fracturing instead of water. However, most studies pay more attention to the fracture generation and ignore the flow characteristic of SC-CO2 jet fracturing in limited perforation scenarios. To accurately explore the flow field in a limited perforation tunnel, a numerical model of a SC-CO2 jet in a limited perforation tunnel before fracture initiation is established based on the corresponding engineering background. The comparison between the numerical simulation and experiments has proved that the model is viable for this type of analysis. By using the numerical method, the flow field of the SC-CO2 jet fracturing is analyzed, and influencing factors are discussed later. The verification and validation show that the numerical model is both reliable and accurate. With the dramatic fluctuating of turbulent mixing in a fully developed region, there is an apparent increase in the CO2 density and total pressure during limited perforation. When the z increases from 10 times r0 to 145 times r0, the velocity on the perforation wall surface would decrease below 0 m/s, resulting in backflow in the perforation tunnel. The structure of the nozzle, including the outlet length and outlet diameters, significantly affects the axial velocity and boosting pressure in the perforation tunnel. The highest total pressure exists when the nozzle length-to-radius ratio is 2. The maximum velocity of the jet core drops from 138.7 to 78 m/s, and the “hydraulic isolating ring” starts disappearing when the radius changes from 1 to 1.5 mm. It is necessary to increase the aperture ratio as much as possible to ensure pressurization but not over 1. Based on a similar theory high-speed photography results clearly show that the SC-CO2 develops to fully jetting in only 0.07 s and a strong mixing exists in the annular region between the jet core and the surroundings, according with the numerical simulation. This study should be helpful for scholars to comprehensively understand the interaction between the SC-CO2 jet and perforation, which is beneficial for studying SC-CO2 fracturing.

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Hydraulic Fracturing in Inada Granite and Ogino Tuff using Super Critical Carbon Dioxide and Water as Fracturing Fluids

Cited by 25 publications

References 1 publication

Numerical study of supercritical CO₂ and proppant transport in different geometrical fractures

Numerical study of supercritical CO₂ and proppant transport in different geometrical fractures

Pore-scale numerical simulation of supercritical CO2 migration in porous and fractured media saturated with water

The Flow Characteristics of Supercritical Carbon Dioxide (SC-CO2) Jet Fracturing in Limited Perforation Scenarios

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Hydraulic Fracturing in Inada Granite and Ogino Tuff using Super Critical Carbon Dioxide and Water as Fracturing Fluids

Cited by 25 publications

References 1 publication

Numerical study of supercritical CO2 and proppant transport in different geometrical fractures

Numerical study of supercritical CO2 and proppant transport in different geometrical fractures

Pore-scale numerical simulation of supercritical CO2 migration in porous and fractured media saturated with water

The Flow Characteristics of Supercritical Carbon Dioxide (SC-CO2) Jet Fracturing in Limited Perforation Scenarios

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Numerical study of supercritical CO₂ and proppant transport in different geometrical fractures

Numerical study of supercritical CO₂ and proppant transport in different geometrical fractures