Impacts of wellbore orientation with respect to bedding inclination and injection rate on laboratory hydraulic fracturing characteristics of Lushan shale

Zhang, Yongfa; Long, Anfa; Zhao, Yu; Wang, Chaolin; Wu, Shaopeng; Huang, Hao

doi:10.1016/j.fuel.2023.129220

Fuel

2023

DOI: 10.1016/j.fuel.2023.129220

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Impacts of wellbore orientation with respect to bedding inclination and injection rate on laboratory hydraulic fracturing characteristics of Lushan shale

Yongfa Zhang

Anfa Long

Yu Zhao

et al.

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Cited by 23 publications

(1 citation statement)

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“…The injection volume and confining stress have obvious effects on the pump pressure and hydraulic fracture path. The combined impact of perforation direction and bedding plane angle on fracture morphology were also discussed [15][16][17]. It is noted that these experiments are generally conducted by creating a pre-existing bedding plane inside the sample or obtaining the outcrop sample directly from the gas and oil reservoir.…”

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confidence: 99%

Influence of High-Density Bedding Plane Characteristics on Hydraulic Fracture Propagation in Shale Oil Reservoir

Yan,

Wang,

2024

CMES

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The existence of high-density bedding planes is a typical characteristic of shale oil reservoirs. Understanding the behavior of hydraulic fracturing in high-density laminated rocks is significant for promoting shale oil production. In this study, a hydraulic fracturing model considering tensile failure and frictional slip of the bedding planes is established within the framework of the unified pipe-interface element method (UP-IEM). The model developed for simulating the interaction between the hydraulic fracture and the bedding plane is validated by comparison with experimental results. The hydraulic fracturing patterns in sealed and unsealed bedding planes are compared. Additionally, the effects of differential stress, bedding plane permeability, spacing, and the friction coefficient of the bedding plane are investigated. The results showed that a single main fracture crossing the bedding planes is more likely to form in sealed bedding planes under high differential stress. The decrease in bedding plane permeability and the increase in the friction coefficient also promote the fracture propagating perpendicular to the bedding planes. Shale with high-density bedding planes has a poorer fracturing effect than that with low-density bedding planes, as the hydraulic fracture is prone to initiate and propagate along the bedding planes. Moreover, higher injection pressure is needed to maintain fracture propagation along the bedding. An increase in bedding density will lead to a smaller fracturing area. Fracturing fluid seepage into the bedding planes slows shale fracturing. It is recommended that increasing the injection flow rate, selecting alternative fracturing fluids, and employing multiwell/multi-cluster fracturing may be efficient methods to improve energy production in shale oil reservoirs. KEYWORDSHydraulic fracturing; bedding planes; shale; unified pipe-interface element method Nomenclature σEffective stress tensor α Biot coefficient p Fluid pressure

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confidence: 99%

Influence of High-Density Bedding Plane Characteristics on Hydraulic Fracture Propagation in Shale Oil Reservoir

Yan,

Wang,

2024

CMES

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Acoustic Emission Evolution and Hydraulic Fracture Morphology of Changning Shale Stressed to Failure at Different Injection Rates in the Laboratory

Zhang,

Zhao,

Zang

et al. 2023

Rock Mech Rock Eng

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Permeability Evolution of Coal Seam Roof Sandstone Under Thermal Treatment

Bi,

Zheng,

Zhao

et al. 2023

Rock Mech Rock Eng

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Impacts of wellbore orientation with respect to bedding inclination and injection rate on laboratory hydraulic fracturing characteristics of Lushan shale

Cited by 23 publications

References 66 publications

Influence of High-Density Bedding Plane Characteristics on Hydraulic Fracture Propagation in Shale Oil Reservoir

Influence of High-Density Bedding Plane Characteristics on Hydraulic Fracture Propagation in Shale Oil Reservoir

Acoustic Emission Evolution and Hydraulic Fracture Morphology of Changning Shale Stressed to Failure at Different Injection Rates in the Laboratory

Permeability Evolution of Coal Seam Roof Sandstone Under Thermal Treatment

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