Fracture initiation and propagation under different perforation orientation angles in supercritical CO2 fracturing

Chen, Hao; Hu, Yi; Kang, Yong; Cai, Can; Liu, Jiawei; Liu, Yiwei

doi:10.1016/j.petrol.2019.106403

Cited by 53 publications

(27 citation statements)

References 35 publications

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“…With the increase in energy demand, unconventional oil and gas resources represented by shale gas have been paid more and more attention by various countries. , To realize the economic and large-scale exploitation of shale gas, hydraulic fracturing has been widely used as the main method of increasing oil and gas production. , However, hydraulic fracturing has some disadvantages in the field application: (1) in some shale reservoirs, water will interact with clay minerals to hydrate and expand, shrink the pore throat, and produce a water lock effect. − (2) A large amount of wastewater remaining in the reservoir after hydraulic fracturing will cause groundwater pollution. , (3) Access to water resources for shale gas reservoirs in arid regions is also a problem. , …”

Section: Introductionmentioning

confidence: 99%

Numerical Study on Proppant Transport in Supercritical Carbon Dioxide under Different Fracture Shapes: Flat, Wedge-Shaped, and Bifurcated

Xie

Kang

et al. 2022

Energy Fuels

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As a new type of waterless technology, supercritical carbon dioxide fracturing has been widely studied by scholars in recent years, and the migration characteristics of the corresponding proppant in supercritical carbon dioxide still need further research. In this paper, the Eulerian–Eulerian computational fluid dynamics method was used to study the transport capacity of supercritical carbon dioxide, and the UDF method was used to simulate the physical parameters of supercritical carbon dioxide. In view of the deficiencies of previous studies, the special cases of wedge-shaped fractures and bypass fractures are considered, and the influence of large-span pressure and temperature on migration is first analyzed in plane fractures, which makes this study more complete. The results show that: (1) compared with slickwater, the proppant transport channel in supercritical carbon dioxide is 30% smaller at 305 K and 10 MPa. (2) The transport capacity of supercritical carbon dioxide increases with the increase of pressure and decreases with the increase of temperature. But when the pressure or temperature is too high, they have little effect on it. (3) In wedge-shaped fractures, the proppant stack height and length increase initially as the shrinkage rate of fracture width (the ratio of the fracture reduced width to the fracture length) increases. However, as the fracture width ratio increases, the maximum proppant stack height decreases in the later stage. (4) In bifurcated fractures, with the increase of bypass angle, the area of proppant in the bypass zone tends to decrease. The width of the bypass inlet has little effect on the proppant settlement in the bypass. This study further understands the migration law of proppant in supercritical carbon dioxide in fractures.

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Section: Introductionmentioning

confidence: 99%

Numerical Study on Proppant Transport in Supercritical Carbon Dioxide under Different Fracture Shapes: Flat, Wedge-Shaped, and Bifurcated

Xie

Kang

et al. 2022

Energy Fuels

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“…Therefore, SC‐CO 2 is preferable to liquid carbon dioxide and water as fracturing fluid in oil and gas reservoirs 2–3 . SC‐CO 2 fracturing can not only reduce the dependence on water resources and the damage to water‐sensitive reservoirs 4–5 but also reduce the breakdown pressure of rocks 6–8 and improve the complexity of fracture network 9–10 . Moreover, SC‐CO 2 can replace methane adsorbed on the rock surface and displace crude oil in reservoirs 11–12 .…”

Section: Introductionmentioning

confidence: 99%

Transient temperature‐pressure field model of supercritical CO₂ fracturing wellbore with tubing and annulus co‐injection

Luo

Zhao

et al. 2021

Greenhouse Gases

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The physical parameters of supercritical carbon dioxide (SC‐CO2) fracturing fluid are sensitive to temperature and pressure. Accurate prediction of wellbore temperature and pressure during injection is critical for the fracturing efficiency. In this paper, a transient pressure‐field model of SC‐CO2 fracturing wellbore with tubing and annulus co‐injection was established, which was adjusted to consider the Joule–Thomson effect, axial heat conduction, expansion/compression heat, and friction heat. The model predicted the variation patterns of wellbore temperature and pressure, comparing them with those under tubing injection conditions. Effects of tubing‐annulus injection ratios and endothermic mode on bottom‐hole temperature (BHT) and wellhead pressure (WHP) were analyzed in detail. Compared with pure tubing injection, co‐injection provided higher BHT and lower WHP. At constant BHP, WHP dropped with time in the processes of tubing injection or co‐injection, while the former provided a larger WHP drop. With an increase in tubing injection ratio, the difference between tubing and annulus BHT values slightly grew. When the tubing and annulus injection displacements were allocated according to their cross‐sectional area ratio, their WHP was minimal. If CO2 was assumed to absorb all the friction heat, overestimation of BHT and WHP would be observed, which was more pronounced at larger injection displacements. This study's findings are considered instrumental in the design optimization and field application of SC‐CO2 fracturing in unconventional reservoirs. © 2021 Society of Chemical Industry and John Wiley & Sons, Ltd.

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“…In recent decades, high-speed waterjet technology is rapidly developing in many practical and industrial applications, such as cutting (Hsu et al 2013), mining exploring and developing (Lu et al 2015;Chen et al 2019), processing of materials (Zelenak et al 2015;Annoni et al 2008) and heat transfer (Gould et al 2015). In addition, due to its unique nature of non-thermal effect, high-speed waterjets occupy a special position in machining thermal-sensitive materials (Hu et al 2014).…”

Section: Introductionmentioning

confidence: 99%

The Characteristics of Self-Resonating Jet Issuing from the Helmholtz Nozzle Combined with a Venturi Tube Structure

Miao

Kang

et al. 2020

JAFM

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Self-resonating waterjet is a new type of waterjet technology that has been widely used for many practical applications. In order to further improve the performance of self-resonating waterjet, the Helmholtz nozzle was improved by replacing the upper part of a traditional contract structure with a venture tube one. This composite nozzle of a venturi tube structure and a Helmholtz resonator was proposed based on the working mechanism of self-resonating waterjet nozzles and the instability of cavitation flow in venturi tubes. Furthermore, the results were also compared with those generated by a conventional Helmholtz nozzle under the same conditions. The frequency of the pressure pulsation in the oscillating cavity and at the outlet was obtained and analyzed by the classical Fast Fourier transform (FFT) method. The results showed that the main frequency of the pressure oscillation rises to 2362.78Hz, and the peak and average values of the pressure are increased by 45% and 12.5% respectively at the outlet of the composite nozzle. In the oscillating cavity of composite nozzle, the pressure oscillations in the central region have higher frequencies and amplitudes, while near the wall are reversed.

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Fracture initiation and propagation under different perforation orientation angles in supercritical CO2 fracturing

Cited by 53 publications

References 35 publications

Numerical Study on Proppant Transport in Supercritical Carbon Dioxide under Different Fracture Shapes: Flat, Wedge-Shaped, and Bifurcated

Numerical Study on Proppant Transport in Supercritical Carbon Dioxide under Different Fracture Shapes: Flat, Wedge-Shaped, and Bifurcated

Transient temperature‐pressure field model of supercritical CO₂ fracturing wellbore with tubing and annulus co‐injection

The Characteristics of Self-Resonating Jet Issuing from the Helmholtz Nozzle Combined with a Venturi Tube Structure

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Fracture initiation and propagation under different perforation orientation angles in supercritical CO2 fracturing

Cited by 53 publications

References 35 publications

Numerical Study on Proppant Transport in Supercritical Carbon Dioxide under Different Fracture Shapes: Flat, Wedge-Shaped, and Bifurcated

Numerical Study on Proppant Transport in Supercritical Carbon Dioxide under Different Fracture Shapes: Flat, Wedge-Shaped, and Bifurcated

Transient temperature‐pressure field model of supercritical CO2 fracturing wellbore with tubing and annulus co‐injection

The Characteristics of Self-Resonating Jet Issuing from the Helmholtz Nozzle Combined with a Venturi Tube Structure

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Product

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Transient temperature‐pressure field model of supercritical CO₂ fracturing wellbore with tubing and annulus co‐injection