Hydro-mechanical modeling of hydraulic fracture propagation and its interactions with frictional natural fractures

Rueda, Julio; Mejia, Cristian; Roehl, Deane; Pereira, L.C.

doi:10.1016/j.compgeo.2019.03.020

Cited by 56 publications

(17 citation statements)

References 42 publications

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“…However, the contact parameters between particles are hard to determine and the results from particle models are more about strength and failure characteristics of the pre-cracked rock. XFEM is a robust numerical technique for crack initiation and propagation problem, which achieves discontinuities (cracks) within finite elements and can model the arbitrary crack propagation without remeshing [16][17][18]. Xie et al [7,19] employed XFEM to simulate crack propagation of closed flaws in rock and found that the friction of crack surface can affect crack initiation and propagation of the pre-cracked rock.…”

Section: Introductionmentioning

confidence: 99%

Experimental Investigation and Numerical Simulation on the Crack Initiation and Propagation of Rock With Pre-Existing Cracks

Guo

et al. 2020

IEEE Access

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Rock mass behavior is determined not only by the properties of the rock matrix but also mostly by the pre-existing cracks in the rock mass. Before the overall failure of rock, the crack initiation and propagation around the tip of pre-existing cracks (i.e., pre-crack) will occur and contribute to rock failure. In this paper, the deep granite from a gold mine is taken and made to specimens with the pre-crack of 0.3 mm thickness. Uniaxial compression tests are carried out on the pre-cracked specimens. The acoustic emission (AE) sensors and digital image correlation (DIC) system are employed to record the failure characteristics of the specimens. The extended finite element method (XFEM) with the non-local stress field calculation is used to simulate the crack initiation and propagation of pre-cracks. The crack patterns, opening and shearing displacements of the cracked surface, and the crack length development are obtained from numerical simulations. Finally, the effects of friction of crack surface on the crack pattern and crack propagation are investigated and discussed. It has been found that, for pre-cracked specimens, crack initiation and propagation will occur when the stress is much smaller than the rock compressive strength. And in the range of pre-crack angle 30-60°, the larger the pre-crack angle is, the larger the compressive strength is. The crack patterns from numerical simulations have a good agreement with those from experimented DIC results. Moreover, the order of crack propagation speed is consistent with the order of the compressive strength. The crack pattern and crack propagation are affected by the friction coefficient of the cracked surface.

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Section: Introductionmentioning

confidence: 99%

Experimental Investigation and Numerical Simulation on the Crack Initiation and Propagation of Rock With Pre-Existing Cracks

Guo

et al. 2020

IEEE Access

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“…The object of the fracturing process is to obtain single or multiple cracks or even fracture networks with sufficient flow conductivity. One of the mechanisms causing hydraulic fracture complexity is the interaction between hydraulic and natural fractures (Cordero et al., 2019).…”

Section: Introductionmentioning

confidence: 99%

A criterion for identifying a mixed-mode I/II hydraulic fracture crossing a natural fracture in the subsurface

Zeng

Wan

et al. 2020

Energy Exploration & Exploitation

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Hydraulic fracturing has been proven to be an effective technique for stimulating petroleum reservoirs. During the hydraulic fracturing process, the effects of the natural fracture, perforation orientation, stress reorientation, etc. lead to the production of a non-planar, mixed-mode I/II hydraulic fracture. In this paper, a criterion for a mixed-mode I/II hydraulic fracture crossing a natural fracture was first proposed based on the stress field around the hydraulic and natural fractures. When the compound degree (KII/KI) approaches zero, this criterion can be simplified to identify a pure mode I hydraulic fracture crossing a natural fracture. A series of true triaxial fracturing tests were conducted to investigate the influences of natural fracture occurrence and in situ stress on hydraulic fracture propagation. These experimental results agree with the predictions of the proposed criterion.

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“…[13][14][15][16][17][18] Hydraulic fracturing (HF) is an effective method for improving the permeability in oil and gas reservoirs; meanwhile, it is also used for the coal bed methane (CBM) development due to the merits in CBM resource exploitation, coal and gas burst disaster, and emission reduction. Rueda Cordero et al 22 have established a hydromechanical model for hydraulic fracture propagation and its interactions with frictional natural fractures. On the basis of hydraulic fracturing, Lin et al 19 proposed a permeability enhancement technique associated with pressure relief using a high-pressure pulse hydraulic fracturing method.…”

Section: Introductionmentioning

confidence: 99%

“…In addition, for issue of coal and gas outburst may be triggered by coal recovering at rock crosscut area. Rueda Cordero et al 22 have established a hydromechanical model for hydraulic fracture propagation and its interactions with frictional natural fractures. Feng et al 23 developed a fixed-point hydraulic fracturing method for coal seam rockburst prevention, and they found that resistance increasing and energy releasing are the two main roles of hydraulic fracturing in order to prevent rockburst.…”

Section: Introductionmentioning

confidence: 99%

Permeability enhancement mechanism of sand‐carrying hydraulic fracturing in deep mining: A case study of uncovering coal in cross‐cut

Yin

Cheng

et al. 2019

Energy Science & Engineering

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Coal and gas outburst disasters are prone to occur within rock cross‐cut coal uncovering in deep underground coal mines. To reduce the risk of coal and gas burst under rock cross‐cut coal uncovering, a technique of permeability enhancement using hydraulic fracturing sand‐carrying is proposed. Field test was conducted using HF sand‐carrying approach, and the effect of permeability enhancement was investigated. The results show that the evolution of cracks has been subjected three stages: energy slowly increasing and crack initiation, damage localization of coal seam and gradually failure, and crack instability expansion and formation of a complex fracture network system. In addition, it is found that “water‐sand” type injection of high‐pressure fluid carried sand into HF cracks, which creates a support force on crack surface and prevents crack closure. A fully developed fracture network system with high flow conductivity capacity is created and thus increases gas permeability largely. Furthermore, a clearly increasing trend associated with the HF sand‐carrying is found for the treated coal seam area. The permeability coefficient is about 21.5‐30.5 times higher than that from the raw coal seam. A good prevention effect of coal and gas outburst is achieved using HF sand‐carrying method.

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Hydro-mechanical modeling of hydraulic fracture propagation and its interactions with frictional natural fractures

Cited by 56 publications

References 42 publications

Experimental Investigation and Numerical Simulation on the Crack Initiation and Propagation of Rock With Pre-Existing Cracks

Experimental Investigation and Numerical Simulation on the Crack Initiation and Propagation of Rock With Pre-Existing Cracks

A criterion for identifying a mixed-mode I/II hydraulic fracture crossing a natural fracture in the subsurface

Permeability enhancement mechanism of sand‐carrying hydraulic fracturing in deep mining: A case study of uncovering coal in cross‐cut

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