Numerical study of hydraulic fracture propagation in inherently laminated rocks accounting for bedding plane properties

Liu, Zaobao; Han, Bei; Zhu, Shu; Zhang, Xin

doi:10.1016/j.petrol.2021.109798

Cited by 20 publications

(7 citation statements)

References 45 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…The interaction between HFs and discontinuities(i.e. BPs in this study) can be observed in three main modes [ 6 , 7 , 11 , 19 , 24 , 25 ]: 1. HF opens the BP and propagates along the BP (dilate); 2.…”

Section: Introductionmentioning

confidence: 73%

Prediction criterion and numerical validation for the interaction between hydraulic fractures and bedding planes

Men,

Han

2023

PLoS ONE

View full text Add to dashboard Cite

Shale is a kind of sedimentary rock with an obvious bedding structure. The effect of the bedding plane on hydraulic fracture initiation, propagation, and complex fracture network formation is remarkable and a major problem in hydraulic fracturing and shale oil and gas development. In this study, a criterion is established to predict the evolution behavior of hydraulic fractures (HF) under different confining pressure differences and intersection angles. This criterion is intended to predict the types of interaction between HFs and bedding planes (BPs): penetrating, slipping, or dilating. The dependence of crossing on the intersection angle and the principal stress difference is quantitatively presented using the criterion. Meanwhile, 20 simulations with principal stress differences of 2, 4, 6, and 8 MPa and intersection angles of 30°, 45°, 60°, 75°, and 90° were simulated using the RFPA2D-Flow code. Simulation results exhibit good agreement with the criterion results for a wide range of angles. The investigation showed that HFs tend to penetrate BPs under high confining pressure differences and intersection angles and open BPs under low confining pressure differences and intersection angles. In addition to the above two forms, HFs slip due to shear. The criterion can provide relevant reference about the formation of complex fracture networks in shale layers.

show abstract

Section: Introductionmentioning

confidence: 73%

Prediction criterion and numerical validation for the interaction between hydraulic fractures and bedding planes

Men,

Han

2023

PLoS ONE

View full text Add to dashboard Cite

show abstract

“…Among them, the existence of discontinuities such as faults, fractures, and natural fractures is an important reason for the complexity and variability of hydraulic fracture propagation paths. It is found that when hydraulic fractures encounter discontinuities, they may undergo behaviors such as arrested, diverted, penetrated directly, and simultaneously penetrated and diverted (Zhang et al, 2022;Guo et al, 2021). The speci c behavior that occurs is in uenced by factors such as the strength of the natural fracture, production, friction characteristics, geostress, fracturing uid, and construction parameters (Zou et Xie et al, 2022).…”

Section: Introductionmentioning

confidence: 99%

Experimental study of the effect of natural fracture curvature on hydraulic fracture propagation behavior

Gong,

Jin,

et al. 2024

Preprint

View full text Add to dashboard Cite

The interaction mechanism between hydraulic fractures and natural fractures has been the focus of hydraulic fracturing research. To reveal the influence mechanism of natural fractures with different curvatures on hydraulic fracture propagation during the fracturing process, this study simulated the hydraulic fracture propagation patterns under natural fractures with different curvatures by carrying out large-size true triaxial hydraulic fracturing physical modeling experiments on artificial rock samples prefabricated with different curvatures of fractures. Results show that the injection rate of fracturing fluid and the curvature of natural fractures have important effects on the interaction between hydraulic fractures and natural fractures. When the approximation angle (the angle between the hydraulic fracture and the natural fracture) is 90°, with the gradual decrease of the fracturing fluid injection rate, the interaction between the hydraulic fracture and the natural fracture shows that the hydraulic fracture passes through the natural fracture directly, and gradually changes to the hydraulic fracture passes through the natural fracture and also extends along the natural fracture, and then in the end, only hydraulic fracture extends along the natural fracture occurs. When the injection rate is constant and the approximation angle is 90°, with the curvature of the natural crack gradually increasing (increasing curvature), the interaction between the hydraulic fracture and the natural fracture shows that the hydraulic fracture passes through the natural fracture and also partially extends along the natural fracture, and gradually changes to the hydraulic fracture extending only along the natural fracture, and then finally extends along the direction of the maximum horizontal principal stress. The results of the study are instructive for revealing the interaction mechanism between hydraulic fractures and natural cracks.

show abstract

“…proposed a model to simulate the anisotropic mechanical behavior of shale with considering direction of laminations and elucidated directional dependence of tensile and compressive strengths. Subsequently, abundant research began to study the effect of lamination (Liu et al, 2020;Zhang et al, 2022) or heterogeneity (Huang et al, 2019;Huang et al, 2023) on fracture propagation through numerical simulation, macroscopic mechanics (Huang et al, 2020;Yang et al, 2021) and fracturing experiments (Lei et al, 2021;Yang et al, 2021) developed a novel constitutive model to investigate fracture evolution behavior in layered rock with considering the mechanical behavior of soft layers and hard layers as well as layer interfaces. Results demonstrated that bedding inclination angle greatly influenced finale fracture pattern of the layered rock (Tan et al, 2017;Tan et al, 2023).…”

Section: Introductionmentioning

confidence: 99%

Identification of different lithofacies laminations in oil shale and their mechanical properties

Cheng,

Sheng,

Deng

2024

Front. Energy Res.

View full text Add to dashboard Cite

Lamination can greatly enhance the anisotropy and heterogeneity of shale and plays a significant role in influencing hydraulic fracturing. The structure and mechanical difference of different lithofacies lamination are the basis to reveal the fracture propagation mechanism. In this paper, research focused on three continental oil shale with different lithofacies in Qikou sag, Bohai Bay basin, including Quartz-Feldspar dominated shale, Carbonate dominated shale and mixed-mineral shale. Scanning electron microscopy and mineral analysis are used to identify quartz-feldspar lamination and mixture lamination in Quartz-Feldspar dominated shales, as well as carbonate lamination and mixture lamination in Carbonate dominated shales. The distinct laminations with different characteristics were precisely located using FIB, which served as the guiding tool for the indentation experiment. The micromechanical properties of laminations with different lithofacies in oil shale samples are examined using the nanoindentation technique, highlighting their distinct differences. The findings demonstrate that the micromechanical properties of quartz-feldspar lamination in Quartz-Feldspar dominated shales exhibit superior strength, while the mechanical difference between laminations in Quartz-Feldspar dominated shales are significantly larger. The quartz-feldspar lamination exhibits the highest resistance when subjected to indentation force. The mechanical properties of mixture lamination in Quartz-Feldspar dominated shales and Carbonate dominated shales are comparable due to their similar mineral composition. Moreover, in conjunction with macroscopic rock mechanics experiments, it has been verified that the lamination structure facilitates the initiation and propagation of macroscopic fractures under stress loading.

show abstract

Numerical study of hydraulic fracture propagation in inherently laminated rocks accounting for bedding plane properties

Cited by 20 publications

References 45 publications

Prediction criterion and numerical validation for the interaction between hydraulic fractures and bedding planes

Prediction criterion and numerical validation for the interaction between hydraulic fractures and bedding planes

Experimental study of the effect of natural fracture curvature on hydraulic fracture propagation behavior

Identification of different lithofacies laminations in oil shale and their mechanical properties

Contact Info

Product

Resources

About