Generation and propagation characteristics of fluctuation pressure in hydraulic fracturing with unstable fluid-injection

Zhu, Guangjun; Dong, Shimin; Jia, He-tong; Zhang, Dong

doi:10.1007/s11771-022-4934-8

Cited by 3 publications

(3 citation statements)

References 26 publications

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“…Moreover, the shape of cyclic injection pressure, such as triangle, sine and rectangular waves, may also influence the fluid pressure migration and the associated seismicity. Particularly, the amplitude ratio produced in the case of rectangular wave is the largest followed by sine and triangular waves with the same pressure amplitude and cycle period, while the phase shift remains similar in the three cases (Zhu et al 2022). But the differences in amplitude ratio caused by different shapes of cyclic injection pressure may not be significant (Zhu et al 2022).…”

Section: Limitations Of the Numerical Modelmentioning

confidence: 91%

“…Particularly, the amplitude ratio produced in the case of rectangular wave is the largest followed by sine and triangular waves with the same pressure amplitude and cycle period, while the phase shift remains similar in the three cases (Zhu et al 2022). But the differences in amplitude ratio caused by different shapes of cyclic injection pressure may not be significant (Zhu et al 2022). In addition, other factors associated with fluid injection, mainly including shear slip (aseismic or seismic), poroelasticity and thermoelasticity, may also have significant effects on fluid pressure migration and seismic hazards along a fault zone (e.g.…”

Section: Limitations Of the Numerical Modelmentioning

confidence: 91%

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Modelling of fluid pressure migration in a pressure sensitive fault zone subject to cyclic injection and implications for injection-induced seismicity

Zhang

Hofmann

et al. 2022

Geophysical Journal International

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Summary Fault zones often serve as the major fluid pathways in a variety of geo-energy systems, such as deep geothermal systems. However, injection-induced instability of faults can sometimes lead to large-magnitude earthquakes. Cyclic injection has thus been proposed as an alternative injection protocol to better manage and mitigate the associated seismic risks. The risks of injection-induced seismicity depend primarily on the extent and magnitude of the fluid pressure perturbation. When fluid is injected into a fault zone, the local fault permeability will be enhanced, which in turn promotes the migration of fluid along the fault. This nonlinear process is further complicated during cyclic injection via alternating the injection pressure. In this study, both numerical and analytical modeling are conducted to investigate cyclic fluid injection into a fault zone with pressure sensitive permeability, in which the local fault permeability changes as a function of the local effective stress. The match with laboratory-scale experimental and field-scale analytical results of cyclic fluid injection verifies the accuracy of the numerical model. The parametric study reveals that the injection pressure attenuation, quantified by the amplitude ratio and phase shift, is enhanced by a lower initial fault permeability, a smaller stress sensitivity coefficient, and a shorter period of pressure cycle (i.e. a higher frequency). Besides, the amplitude of the pressure cycle has a negligible effect on the injection pressure attenuation. We also discuss the implications of our results for the less amenable far-field seismic hazard and post shut-in seismicity.

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Section: Limitations Of the Numerical Modelmentioning

confidence: 91%

Section: Limitations Of the Numerical Modelmentioning

confidence: 91%

Modelling of fluid pressure migration in a pressure sensitive fault zone subject to cyclic injection and implications for injection-induced seismicity

Zhang

Hofmann

et al. 2022

Geophysical Journal International

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“…Horizontal drilling and fracking represent core technologies in this domain. For example, some studies have indicated that [31], unlike the stable injection method used in conventional fracking, employing a variable injection flow rate for unstable fluid injection can yield significant dynamic effects, ultimately enhancing the effectiveness of the fracturing process. Determining the optimal application of these fracturing technologies in formations with varying geological structures and activity levels poses a challenging problem that requires urgent exploration.…”

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confidence: 99%

Geomechanics for Energy and the Environment

Feng,

Xie,

Liu

et al. 2023

Energies

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Propagation Mechanism of Pressure Waves during Pulse Hydraulic Fracturing in Horizontal Wells

Zhang,

Zuo,

Fei

et al. 2024

Applied Sciences

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Hydraulic fracturing, especially pulse hydraulic fracturing, is an important method for extracting oil and gas from low-permeability reservoirs, improving recovery rates significantly. Pulse hydraulic fracturing, which involves varying injection rates to create pressure waves, outperforms traditional constant-flow fracturing methods significantly. However, during pulse hydraulic fracturing operations, the flow properties of the fluid in the column change from moment to moment. Furthermore, current research on pulse hydraulic fracturing primarily focuses on vertical wells, while horizontal wells have become a common operational strategy. Therefore, a transient flow model of fluid within a horizontal well, considering variable-flow injection and unsteady friction conditions, is established in this paper. The model is solved using both the characteristic line method and the finite difference method. The hydrodynamic properties of the fracturing fluid were analyzed, and the propagation mechanisms of pressure waves within horizontal wells under various fluid injection schemes and well depths are analyzed to provide a reference for selecting appropriate fluid injection schemes in engineering practice. The study highlights the impact of fluid viscosity and injection flow amplitude on bottomhole pressure fluctuations, advancing the efficient development of low-permeability oilfields.

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Generation and propagation characteristics of fluctuation pressure in hydraulic fracturing with unstable fluid-injection

Cited by 3 publications

References 26 publications

Modelling of fluid pressure migration in a pressure sensitive fault zone subject to cyclic injection and implications for injection-induced seismicity

Modelling of fluid pressure migration in a pressure sensitive fault zone subject to cyclic injection and implications for injection-induced seismicity

Geomechanics for Energy and the Environment

Propagation Mechanism of Pressure Waves during Pulse Hydraulic Fracturing in Horizontal Wells

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