Propagation and geometry of multi-stage hydraulic fractures in anisotropic shales

Khadijeh, Mahmoud; Yehya, Alissar; Maalouf, Elsa

doi:10.1007/s40948-022-00425-y

Cited by 8 publications

(2 citation statements)

References 37 publications

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“…The simulation is simplified to a 2D model because HF operations occur around a horizontal well and affect the formation properties of a vertical planar region of relatively small width with respect to the domain. Moreover, the main fractures generated by the HF operations propagate in the vertical plane (Khadijeh et al., 2022). Therefore, we consider a cross section that passes through the horizontal well for the 2D model shown in Figure 1.…”

Section: Methodsmentioning

confidence: 99%

Analysis of the Hydrogeological Conditions Affecting Fault Response to Nearby Hydraulic Fracturing

2022

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The response of critically stressed dormant faults to fluid perturbation, by oil and gas production, has been a major public concern because of its link to induced seismicity. In this paper, we study the hydrogeological factors that affect a nearby fault response, during and after hydraulic fracturing (HF) operations, evaluated by the change in Coulomb Failure Stress (CFS) and the rate of seismicity (R) through coupling solid deformation and fluid flow. Our results show that the pore pressure increases rapidly in a fault that is close (hydraulically connected) to HF operations, which might lead to its activation when the injection rate is high. When the fault is adjacent to HF but distant from it, its shallow region is subjected to a stabilizing deformation‐induced normal compressive stress and its deeper region is destabilized under extension. In this case, the fault orientation and damage zone size have a significant effect on the fault's stability and response. On the other hand, decreasing the rate of injection can either increase or decrease the CFS values depending on the fault location and the dominant stresses. Therefore, serious attention should be given to the fault position, its architecture, and the injection rate to help reduce the potential for induced seismicity from HF. Our findings are verified and confirmed using the case of the Duvernay formation in Alberta, Canada, where the reported seismic data correlate with high CFS and R values.

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Section: Methodsmentioning

confidence: 99%

Analysis of the Hydrogeological Conditions Affecting Fault Response to Nearby Hydraulic Fracturing

2022

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“…To tackle this issue, this study focuses on assessing the capability of ultrasonic techniques in detecting and characterizing these microfractures in Tunisian carbonate rock formations. By evaluating the effectiveness of these techniques, we aim to provide valuable insights into addressing the challenge of detecting subsurface microfractures and enhance human safety and the preservation of critical structures (Khadijeh et al 2022).…”

Section: Introductionmentioning

confidence: 99%

Characterizing Microcracks in Carbonate Rock Subsurfaces in Tunisia Using Ultrasonic Velocity Variations

Abdelhedi

Abbes

2023

Preprint

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The recent, catastrophic earthquake that struck Turkey and surrounding regions in February 2023 has emphasized the need for an accurate and efficient method for identifying subsurface microfractures. These cracks, which are not visible to the naked eye, pose a significant threat to human safety. To tackle this issue, this study explores the use of ultrasonic waves for detecting and characterizing microfractures in carbonate rock subsurfaces in Tunisia. The study involves collecting carbonate rock samples from subsurface formations in Tunisia and analyzing their ultrasonic wave velocity and velocity variations under uniaxial compressive stress in the laboratory. Our results show that ultrasonic methods are a reliable and effective means of detecting microfractures in subsurface materials, even in comparison to other seismic methods. These findings have significant implications for subsurface exploration and the protection of critical structures and highlight the potential of ultrasonic methods for characterizing microfractures in carbonate rock subsurfaces. This study underscores the importance of continued research in this area and highlights the urgency of developing effective methods for detecting subsurface cracks to ensure the safety of communities in seismically active regions.

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A new hydro-mechanical coupling constitutive model for brittle rocks considering initial compaction, hardening and softening behaviors under complex stress states

Zheng

Wang

et al. 2023

Geomech. Geophys. Geo-energ. Geo-resour.

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After the excavation of underground engineering, the failure and instability of surrounding rock under hydro-mechanical coupling conditions is a common type of engineering disaster. However, the hydro-mechanical coupling mechanical characteristics of rock have not been fully revealed, and suitable models for the stability analysis of surrounding rock under hydro-mechanical coupling conditions are very scarce. Therefore, a series of triaxial compression and cyclic loading and unloading hydro-mechanical coupling tests were carried out to study the mechanical characteristics, deformation and mechanical parameters of rock under different confining pressures and pore pressures. Then, based on Biot’s effective stress principle, a hydro-mechanical coupling damage constitutive model within the framework of irreversible thermodynamics was proposed to describe the initial compaction effect, pre-peak hardening and post-peak softening behaviors. The functional relationships between the proposed model key parameters (η and ζ) and the effective stress were established to characterize the pre- and post-peak nonlinear behaviors of rock. A compaction function Ck for the evolution of the undamaged Young’s modulus in initial compaction stage was introduced to characterize the pre-peak compaction effect. A user-defined material subroutine (UMAT) was compiled in ABAQUS to numerically implemented the proposed model. The numerical simulation results are highly consistent with the test results, the proposed model can also predict the hydro-mechanical coupling characteristics of rock under untested stress levels. In addition, the yield function of the proposed model considers the influence of intermediate principal stress, which is also suitable for the simulation of hydro-mechanical coupling characteristics under true triaxial stress states. Graphical abstract

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Propagation and geometry of multi-stage hydraulic fractures in anisotropic shales

Cited by 8 publications

References 37 publications

Analysis of the Hydrogeological Conditions Affecting Fault Response to Nearby Hydraulic Fracturing

Analysis of the Hydrogeological Conditions Affecting Fault Response to Nearby Hydraulic Fracturing

Characterizing Microcracks in Carbonate Rock Subsurfaces in Tunisia Using Ultrasonic Velocity Variations

A new hydro-mechanical coupling constitutive model for brittle rocks considering initial compaction, hardening and softening behaviors under complex stress states

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