Coupled flow-stress-damage simulation of deviated-wellbore fracturing in hard-rock

Zhu, Hehua; Zhao, Xing; Guo, Jianchun; Jin, Xiaochun; An, Feng-Chen; Wang, Yonghui; Lai, Xinmin

doi:10.1016/j.jngse.2015.07.007

Cited by 43 publications

(16 citation statements)

References 42 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…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

View full text Add to dashboard Cite

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.

show abstract

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

View full text Add to dashboard Cite

show abstract

“…[30][31][32][33][34][35][36] ABAQUS gets a rich material database to meet most engineering needs, and UMAT subroutines define arbitrary material properties autonomously. ABAQUS is a general purpose finite-element-analysis code that can analyze fluid seepage and mechanical problems in porous media and has been widely used for solving mechanical problems around a wellbore in recent years.…”

Section: Numerical Modelmentioning

confidence: 99%

“…ABAQUS is a general purpose finite-element-analysis code that can analyze fluid seepage and mechanical problems in porous media and has been widely used for solving mechanical problems around a wellbore in recent years. [30][31][32][33][34][35][36] ABAQUS gets a rich material database to meet most engineering needs, and UMAT subroutines define arbitrary material properties autonomously.…”

Section: Numerical Modelmentioning

confidence: 99%

Wellbore shrinkage during drilling in methane hydrate reservoirs

Yan

Yang

Yan³

et al. 2019

Energy Science & Engineering

View full text Add to dashboard Cite

Methane hydrates as a clean and abundant energy source, have attracted the attention of the world. However, the instability of hydrate reservoirs makes it difficult to drill production wells. After drilling, the creep properties of hydrate reservoir would cause wellbore shrinkage, which will affect the drilling safety. This study is to analysis law of wellbore shrinkage after a hydrate well drilled. The results demonstrate that wellbore shrinkage mainly results from plastic deformation and creep deformation. The largest and smallest values are separately found in the directions of the maximum and minimum horizontal in‐situ stress. With the increase of initial in‐situ stress ratio, wellbore shrinkage linearly rise. Under the condition of low horizontal in‐situ stress ratio, wellbore shrinkage is mainly determined by creep deformation. Under the condition of high horizontal in‐situ stress ratio, wellbore shrinkage commonly depends on plastic deformation and creep deformation. With deepening methane hydrate reservoirs, wellbore shrinkage shows a nonlinear increase. For formations with higher hydrate saturation, larger wellbore shrinkage would occur. The research results can provide a theoretical basis for the selection of drilling method while drilling in hydrate formations.

show abstract

“…The FSD model can be applied not only to simulate the dynamic fracturing process of various reservoirs (including but not limited to shale, Guo et al, 2017;glutenite, hard rock, Zhu et al, 2015 andbrittle rock, Li et al, 2011;etc. ), but also to the study of fracturing in deviated (Zhu et al, 2015) and horizontal wells (Guo et al, 2015a).…”

Section: Mathematical Model Of Fracture Propagationmentioning

confidence: 99%

Numerical simulation of horizontal well network fracturing in glutenite reservoir

Qi¹,

Li²,

Li³

et al. 2018

Oil Gas Sci. Technol. – Rev. IFP Energies nouvelles

View full text Add to dashboard Cite

Hydraulic fracturing is an economically effective technology developing the glutenite reservoirs, which have far stronger heterogeneity than the conventional sandstone reservoir. According to the field production experience of Shengli Oilfield, horizontal-well fracturing is more likely to develop a complex fractured network, which improves the stimulated volume of reservoir effectively. But the clear mechanism of horizontal-well hydraulic fracture propagation in the glutenite reservoirs is still not obtained, thus it is difficult to effectively carry out the design of fracturing plan. Based on the characteristics of the glutenite reservoirs, a coupled Flow-Stress-Damage (FSD) model of hydraulic fracture propagation is established. The numerical simulation of fracturing expansion in the horizontal well of the glutenite reservoir is conducted. It is shown that a square mesh-like fracture network is developed near the horizontal well in the reservoir with lower stress difference, in which fracture is more prone to propagate along the direction of the minimum principal stress as well. High fracturing fluids injection displacement and high fracturing fluid viscosity lead to the rise of static pressure of the fracture, which results in the rise of fracture complexity, and greater probability to deflect when encountering gravels. As the perforation density increases, the micro-fractures generated at each perforation gather together faster, and the range of the stimulated reservoir is also relatively large. For reservoirs with high gravel content, the complexity of fracture network and the effect of fracture communication are obviously increased, and the range of fracture deflection is relatively large. In the case of the same gravel distribution, the higher the tensile strength of the gravel, the greater fracture tortuosity and diversion was observed. In this paper, a simulation method of horizontal well fracture network propagation in the reservoirs is introduced, and the result provides the theoretical support for fracture network morphology prediction and plan design of hydraulic fracturing in the glutenite reservoir.

show abstract

Coupled flow-stress-damage simulation of deviated-wellbore fracturing in hard-rock

Cited by 43 publications

References 42 publications

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

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

Wellbore shrinkage during drilling in methane hydrate reservoirs

Numerical simulation of horizontal well network fracturing in glutenite reservoir

Contact Info

Product

Resources

About