The effect of natural fracture dip and strike on hydraulic fracture propagation

Dehghan, Ali Naghi; Goshtasbi, Kamran; Ahangari, Kaveh; Jin, Yan

doi:10.1016/j.ijrmms.2015.02.001

Cited by 74 publications

(26 citation statements)

References 22 publications

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“…All the experiments were stimulated in a normal-fault setting. In order to consider a hydraulic fracture field test being simulated in laboratory scale, scaling laws are applied to scale the fracturing parameters [28][29][30][31]. According to the in-situ field characteristics of Yaoke1 well, for the laboratory experiments, the maximum stress was the vertical stress σv of 4.28 MPa, and its value was kept constant for each experiment.…”

Section: Experimental Designmentioning

confidence: 99%

Investigation of Fracturing Network Propagation in Random Naturally Fractured and Laminated Block Experiments

Wang

et al. 2016

Energies

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Abstract:Researchers have recently realized thatsilty laminas are very developed in naturally fractured continentalsedimentary formations in the Ordos Basin(China). Studies have shown that silty laminas are significant to improve the physical properties and gas storage capacity, and the natural fractures interact with the hydraulic fractures to maximize the fracture network during hydraulic fracturing. However, the influence of silty laminas withrandom fractures on the created hydraulic fracture networkis not well understood. Laboratory experiments are proposed to investigate the evolution of fracture networks in naturally fractured formations with model blocks that contain laminas and random fractures. The influence of dominating factors was studied and analyzed, with an emphasis on stress ratio, injection rate, and laminae strength. Macroscopic failure morphology descriptions combined with meso 3-D laser scanning techniques are both used to reveal the evolution of fracture networks. It is suggested that high injection rate, medium laminae strength, and low stress ratio tend to increase the stimulated reservoir volume (SRV). The interactions between the silty laminae and random natural fractures affect the effect of hydraulic fracturing effectiveness. This work strongly links the production technology and fracability evaluation in the continental shale formation. It can aid in the understanding and optimization of hydraulic fracturing simulations in silty laminae shale reservoirs.

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Section: Experimental Designmentioning

confidence: 99%

Investigation of Fracturing Network Propagation in Random Naturally Fractured and Laminated Block Experiments

Wang

et al. 2016

Energies

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“…Various forms of HF in conditions of different confining pressures, NFs, and crustal stress fields as well as the best boundary conditions for the production of many fracturing cracks have also been investigated [19][20][21]. The extension rule of HF after intersecting with NFs has been very clear [22][23][24][25], but when making contact with BPs of different bedding angles, the extension rule will be more complicated [26][27][28][29][30]. Under the effect of flow, the BPs will affect the fracture extension and result in fractures that develop in the direction of the original crack deviations.…”

Section: Introductionmentioning

confidence: 99%

The Influence of Bedding Planes and Permeability Coefficient on Fracture Propagation of Horizontal Wells in Stratification Shale Reservoirs

et al. 2020

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The complexity of hydraulic fractures (HF) significantly affects the success of reservoir reconstruction. The existence of a bedding plane (BP) in shale impacts the extension of a fracture. For shale reservoirs, in order to investigate the interaction mechanisms of HF and BPs under the action of coupled stress-flow, we simulate the processes of hydraulic fracturing under different conditions, such as the stress difference, permeability coefficients, BP angles, BP spacing, and BP mechanical properties using the rock failure process analysis code (RFPA2D-Flow). Simulation results showed that HF spread outward around the borehole, while the permeability coefficient is uniformly distributed at the model without a BP or stress difference. The HF of the formation without a BP presented a pinnate distribution pattern, and the main direction of the extension is affected by both the ground stress and the permeability coefficient. When there is no stress difference in the model, the fracture extends along the direction of the larger permeability coefficient. In this study, the in situ stress has a greater influence on the extension direction of the main fracture when using the model with stress differences of 6 MPa. As the BP angle increases, the propagation of fractures gradually deviates from the BP direction. The initiation pressure and total breakdown pressure of the models at low permeability coefficients are higher than those under high permeability coefficients. In addition, the initiation pressure and total breakdown pressure of the models are also different. The larger the BP spacing, the higher the compressive strength of the BP, and a larger reduction ratio (the ratio of the strength parameters of the BP to the strength parameters of the matrix) leads to a smaller impact of the BP on fracture initiation and propagation. The elastic modulus has no effect on the failure mode of the model. When HF make contact with the BP, they tend to extend along the BP. Under the same in situ stress condition, the presence of a BP makes the morphology of HF more complex during the process of propagation, which makes it easier to achieve the purpose of stimulated reservoir volume (SRV) fracturing and increased production.

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“…Warpinski et al [5,6] found that the growth and geometry of hydraulic fractures were affected by the stress, joints, faults, interfaces and layer material property. Much research has studied factors affecting HF with the development of laboratory equipment and construction of True-Triaxial test devices [7][8][9][10][11][12]. Zhou et al [7] also studied the interaction between HF and NF through a series of experiments and presented the crossed boundary based on different stress regimes.…”

Section: Introductionmentioning

confidence: 99%

Discrete Element Simulation of Interaction between Hydraulic Fracturing and a Single Natural Fracture

Basirat

Goshtasbi

Ahmadi

2019

Fluids

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Hydraulic fracturing (HF) treatment is performed to enhance the productivity in the fractured reservoirs. During this process, the interaction between HF and natural fracture (NF) plays a critical role by making it possible to predict fracture geometry and reservoir production. In this paper, interaction modes between HF and NF are simulated using the discrete element method (DEM) and effective parameters on the interaction mechanisms are investigated. The numerical results also are compared with different analytical methods and experimental results. The results showed that HF generally tends to cross the NF at an angle of more than 45° and a moderate differential stress (greater than 5 MPa), and the opening mode is dominated at an angle of fewer than 45°. Two effects of changing in the interaction mode and NF opening were also found by changing the strength parameters of NF. Interaction mode was changed by increasing the friction coefficient, while by increasing the cohesion of NF it was less opened under a constant injection pressure.

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The effect of natural fracture dip and strike on hydraulic fracture propagation

Cited by 74 publications

References 22 publications

Investigation of Fracturing Network Propagation in Random Naturally Fractured and Laminated Block Experiments

Investigation of Fracturing Network Propagation in Random Naturally Fractured and Laminated Block Experiments

The Influence of Bedding Planes and Permeability Coefficient on Fracture Propagation of Horizontal Wells in Stratification Shale Reservoirs

Discrete Element Simulation of Interaction between Hydraulic Fracturing and a Single Natural Fracture

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