A review of laboratory studies and theoretical analysis for the interaction mode between induced hydraulic fractures and pre-existing fractures

Zhang, Qi; Zhang, Xiaoping; Sun, Wei

doi:10.1016/j.jngse.2020.103719

Cited by 44 publications

(20 citation statements)

References 77 publications

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“…It can be seen that there are three modes for the interaction between HF and NF: (1) Deflection-the fracture deflects into the NF and propagates along with the NF until the tip of the NF, then deflects again along the maximum in-situ principal stress direction (approach angle of 30°); (2) Offset-The fracture deflects into the NF and propagates along with the NF, but offsets to the maximum in situ principal stress direction before the tip of the NF (45°, 60°); (3) Cross-the HF crosses the NF without deflection (75°, 90°). The larger the approach angle, the more prone the HF is to cross the NF, matching observations from experiments and fracking practices (Dehghan 2020;Kolawole and Ispas 2019;Zhang et al 2021).…”

Section: Effect Of Approach Anglementioning

confidence: 58%

“…In the past decades, considerable research has been carried out to investigate the interaction mechanisms between HF and NF (Blanton 1982;Dehghan et al 2015a, b;Rahman and Rahman 2013;Renshaw and Pollard 1995;Sarmadivaleh and Rasouli 2013;Zhang et al 2021;Zhou et al 2008). Blanton (1982) carried out a series of experiments on shale specimens with a single pre-existing fracture and found that hydraulic fractures tended to cross over preexisting fractures under high differential stresses and high approach angles.…”

Section: Introductionmentioning

confidence: 99%

“…Because of the limitations of analytical models on predicting crack interaction and propagation with the fluid flow (Zhang et al 2021;Sarmadivaleh and Rasouli 2013) and the experimental difficulties of preparing specimens with precise natural fractures (Zhou et al 2008;Dehghan et al 2015a, b), the numerical method has brought considerable advantages. Zhang and Jeffrey (2006) developed a numerical method based on stress intensity factors and modelled the interaction between frictional NF and HF in the impermeable rock matrix.…”

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Mixed-Mode Fracture Modelling of the Near-Wellbore Interaction Between Hydraulic Fracture and Natural Fracture

Shipton

Kendrick

et al. 2022

Rock Mech Rock Eng

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The interaction between hydraulic fractures (HF) and natural fractures (NF) is one of the most fundamental phenomena in hydraulic fracturing. The near-wellbore interaction between HF and NF significantly affects fracking-related operations including the injected fluid flow, proppant transport and well productivity. However, the nature of fracturing modes, combined with hydro-mechanical coupling, poses great difficulties and challenges in addressing this problem. Literature review suggests that little research has been undertaken on near-wellbore interaction, especially considering the fully coupled hydro-mechanical mixed-mode fracturing process. This paper develops a new fracture model incorporating the Mohr–Coulomb criterion with the cohesive crack model. The model is implemented into ABAQUS solver by in-house FORTRAN subroutines. The rock matrix and cohesive crack interfaces are both coupled with fluid flow. The developed model is then validated by comparing the results with analytical solutions and experimental results. Moreover, the effects of approach angle, NF location, in situ stress, cohesion strength and friction angle of NF, and flow rate on the near-wellbore interaction are investigated. Three interaction modes, i.e., cross, deflect and offset, are reproduced through the numerical method. The crack deflection into NF is a shear-dominated mixed-mode fracture. A high injection pressure in the wellbore tends to drive the HF to cross a NF located close to the wellbore. The smaller the cohesion strength and friction angle of NF is, the larger the offsetting ratio is. A low injection flow rate can help activate natural fractures near the wellbore when intersected by HF.

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Section: Effect Of Approach Anglementioning

confidence: 58%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Mixed-Mode Fracture Modelling of the Near-Wellbore Interaction Between Hydraulic Fracture and Natural Fracture

Shipton

Kendrick

et al. 2022

Rock Mech Rock Eng

View full text Add to dashboard Cite

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“…Coal seam permeability enhancement mainly includes protective layer mining, hydraulic fracturing, hydraulic cutting, hydraulic punching, presplitting blasting, shock wave fracturing, liquid CO 2 blasting, and other hole fracture reconstruction technologies. At present, hydraulic fracturing, hydraulic cutting, and hydraulic flushing have made great progress in increasing the production of shale gas and CBM [8][9][10][11]. However, these methods also introduce some problems.…”

Section: Introductionmentioning

confidence: 99%

Characteristics of Pressure Relief Gas Extraction in the Protected Layer by Surface Drilling in Huainan

Tong

Wen

Cheng

et al. 2021

Advances in Civil Engineering

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To study the behavior of gas extraction from the protected layer by surface drilling, the common characteristics of gas extraction concentration and gas extraction quantity are summarized through the collection of key parameters of surface drilling and a combination of data and figures, with the background of 11−2 coal protection 13−1 coal in the Huainan mining area. The research results show that the flow of pressure relief gas extraction of the protected layer by surface drilling has three stages: a rising period, stable period, and decay period. When the extraction processes of multiple surface wells on the same working face are coordinated, the extraction flow is superimposed, and the extraction volume of surface drilling shows an increasing trend and fluctuates with the location of the drilling. The extraction flow rate before ground drilling is relatively small, and the extraction flow rate increases after ground drilling. This behavior is further confirmed by field observation of mining changes in the protective layer and the expansion and deformation of the protected layer. The periodic variation in the surface drilling and extraction quantity is affected primarily by the mining movement of the working face of the protective layer. Specifically, it is affected by factors such as the mining progress of the working face of the protective layer, mining height, degree of compacted goaf, degree of pressure relief of the protected layer, original gas content, and other measures taken to extract the protected layer.

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“…The hydraulic fracturing technique is a widely used wellstimulation technique to effectively and economically develop oil and gas resources in low-permeability unconventional reservoirs [1,2]. Many field measurements, laboratory tests, and reservoir simulation studies [3][4][5][6][7] have proven that multicluster hydraulic fracturing and horizontal drilling are the key hydraulic fracturing methods.…”

Section: Introductionmentioning

confidence: 99%

Numerical Study of the Effect of Perforation Friction and Engineering Parameters on Multicluster Fracturing in Horizontal Wells

Jiao

Zhang

et al. 2021

Geofluids

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Simultaneous multiple-fracture treatments in horizontal wellbores have become one of the key methods for economically and efficiently developing oil and gas resources in unconventional reservoirs. However, field data show that some perforation clusters have difficulty propagating fractures due to the internal mechanism of competing initiation and propagation among the fractures. In this paper, the physical mechanisms that influence simultaneous multiple-fracture initiation and propagation are investigated, and the effects of engineering parameters and in situ conditions on the nonuniform development of multiple fractures are discussed. A 3D fracture propagation model was established with ABAQUS to show the influence of the stress shadow effects and dynamic partitioning of the flow rate by simulating the propagation of multiple competing fractures generated in the perforation clusters. Based on the results of these simulations, simultaneous flow in multiple fractures can propagate evenly. Through adjusting the number of perforations in each cluster or the perforation diameter, the effect of the stress shadow can be significantly reduced by increasing the perforation friction, and the factors that affect the development of multiple fractures are changed, from the stress shadow effect to the dynamic partitioning of the flow rate. When the stress shadow effect is dominant, increasing the fracturing fluid viscosity promotes the uniform development of multiple fractures and increases the fracture width. When the dynamic partitioning of the flow rate is dominant, increasing the injection rate greatly affects the uniform development of multiple fractures.

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A review of laboratory studies and theoretical analysis for the interaction mode between induced hydraulic fractures and pre-existing fractures

Cited by 44 publications

References 77 publications

Mixed-Mode Fracture Modelling of the Near-Wellbore Interaction Between Hydraulic Fracture and Natural Fracture

Mixed-Mode Fracture Modelling of the Near-Wellbore Interaction Between Hydraulic Fracture and Natural Fracture

Characteristics of Pressure Relief Gas Extraction in the Protected Layer by Surface Drilling in Huainan

Numerical Study of the Effect of Perforation Friction and Engineering Parameters on Multicluster Fracturing in Horizontal Wells

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