The role of stress interference in hydraulic fracturing of horizontal wells

Sobhaniaragh, B.; Mansur, Webe João; Peters, Franciane Conceição

doi:10.1016/j.ijrmms.2018.04.024

Cited by 43 publications

(28 citation statements)

References 55 publications

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“…When the cohesive element is completely destroyed, the two bound cohesive surfaces are separated, and hydraulic fracture is generated. When the maximum nominal stress criterion is adopted for rock failure, initiation propagation occurs as the maximum nominal stress ratio reaches a critical value [43][44][45]:…”

Section: 2mentioning

confidence: 99%

Numerical Simulation for Fracture Propagation in Elastoplastic Formations

Ya-fei

Zhao

Cao³

et al. 2021

Geofluids

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Current hydraulic fracture models are mainly based on elastic theories, which fail to give accurate prediction of fracture parameters in plasticity formation. This paper proposes a fluid–solid coupling model for fracture propagation in elastoplastic formations. The rock plastic deformation in the model satisfies the Mohr-Coulomb yield criterion and plastic strain increment theory. The extended finite-element method (XFEM) combined with the cohesive zone method (CZM) is used to solve the coupled model. The accuracy of the model is validated against existing models. The effects of stress difference, friction angle, and dilation angle on fracture shape (length, width), injection pressure, plastic deformation, induced stress, and pore pressure are investigated through the model. The results indicate that compared with elastic formation, fracture propagation in elastoplastic formation is more difficult, the breakdown pressure and extending pressure are greater, and fracture shape is wider and shorter. The plastic deformation causes the fracture tip to become blunt. Under the condition of high stress difference or low friction angle formation, it is prone to occur large plastic deformation zones and form wide and short fracture. Compared with friction angle, dilation angle is less sensitive to plastic deformation, fracture parameters, and fracture geometry. For the formation with high stress difference and friction angle, the effect of plasticity deformation on fracture propagation should not be ignored.

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Section: 2mentioning

confidence: 99%

Numerical Simulation for Fracture Propagation in Elastoplastic Formations

Ya-fei

Zhao

Cao³

et al. 2021

Geofluids

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show abstract

“…When the cohesive element is completely destroyed, the two bound cohesive surfaces are separated and hydraulic fracture is generated. When the maximum nominal stress criterion is adopted for rock failure, initiation propagation occurs as the maximum nominal stress ratio reaches a critical value (Nguyen et al, 2017;Sobhaniaragh et al, 2018aSobhaniaragh et al, , 2018b:…”

Section: Cohesive Crack Modelmentioning

confidence: 99%

“…The fracture damage evolution is determined by damage variables, and the expressions of damage effects on the normal and tangential stress components of the element can be obtained as (Zhu et al, 2015;Sobhaniaragh et al, 2018aSobhaniaragh et al, , 2018b)…”

Section: Cohesive Crack Modelmentioning

confidence: 99%

Application of Extended Finite Element Method in Fracture Propagation Simulation of Plastic Formation

Ya-fei

Li²,

et al. 2021

Preprint

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Current hydraulic fracture models are mainly based on elastic theories, which fail to give accurate prediction of fracture parameters in plasticity formation. This paper proposed a fluid–solid coupling model for fracture propagation in elastoplastic formations. The rock plastic deformation in the model satisfied the Mohr-Coulomb yield criterion and plastic strain increment theory. The coupled model is solved by using extended finite-element method(XFEM) and the cohesive zone method (CZM). The accuracy of the model is verified by comparing the calculated results with existing models. The influences of stress difference, friction angle and dilation angle on fracture shape (length, width), injection pressure, plastic deformation, induced stress and pore pressure are investigated. The results indicate that compared with elastic formation, fracture shape in elastoplastic formation is wider and shorter and fracture propagation is more difficult with greater breakdown pressure and extending pressure. Plastic deformation also cause blunt fracture tip. High stress difference or low friction angle formations tend to occur large plastic deformation area and form wide and short fracture. Compared with friction angle, dilation angle is less sensitive to plastic deformation and fracture parameters and geometry. For the formation with high stress difference and friction angle, plasticity effects on fracture propagation should not be ignored.

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“…Sobhaniaragh [9] presented a poro-elasto-plastic computational model for 2-D hydraulic fracture propagation simulation. They found that the design of the fracture spacing of the first two fractures is of highly importance so as to ensure adequate degree of interference without the concern of generating so much induced stress.…”

Section: Introductionmentioning

confidence: 99%

Crack initiation and propagation in coalbed gas reservoir during hydraulic fracturing

Jiang

Ren

et al. 2019

Sādhanā

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The crack initiation and propagation calculation model during hydraulic fracturing in a coalbed methane reservoir with interlayers is established in this paper. The influence of coal elasticity modulus and fracturing fluid displacement on the fracture geometry are studied. Results show that the fracture initiation begins at the perforation interval. Stress inhomogeneity is detrimental for the formation of multiple cracks for the extension of the fracturing area. The cracks at the boundary have changed from less developed to more developed with increasing horizontal stress coefficient. The coal elasticity modulus and fracturing fluid displacement both play a determinative effect on fracture geometry. The study provides a reference basis for implementing hydraulic fracturing of low permeability coal seams with interlayers.

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The role of stress interference in hydraulic fracturing of horizontal wells

Cited by 43 publications

References 55 publications

Numerical Simulation for Fracture Propagation in Elastoplastic Formations

Numerical Simulation for Fracture Propagation in Elastoplastic Formations

Application of Extended Finite Element Method in Fracture Propagation Simulation of Plastic Formation

Crack initiation and propagation in coalbed gas reservoir during hydraulic fracturing

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