Abstract
In this paper, the influence of natural cavities on the propagation of hydraulic fractures is investigated using the phase field method. The deflection behaviour of a fracture during its propagation is firstly verified against published experimental data. Then, a sensitivity analysis on the mechanical behaviour of fracture propagation near a cavity is conducted. The fracture deflection is quantified in terms of the deviation distance and deflection point. The influence of the Young’s modulus ratio between the cavity and rock mass (Er= Ecave/Erock), the differential stress (Sd= Sx − Sy) and the relative spatial position of the fracture and cavity (lr) on the propagation trajectory are considered. Simulation results show that with the decrease in Er, crack path deviation becomes more prominent. With the increase in Sd, hydraulic fractures tend to propagate along the direction of maximum horizontal geostress. As lr varies, the deflection of the hydraulic fracture can be classified into three regimes: (1) the deflection is negligible; (2) the hydraulic fracture deflects and approaches the natural cavity, but does not connect with it; (3) the hydraulic fracture deflects and connects with the natural cavity. The results could be used as guidance for field design of stimulation scheme in carbonate oil/gas reservoirs.
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Abbreviations
- Ω :
-
The domain of a brittle medium
- U :
-
Displacement field
- \({\varvec{\upvarepsilon}}({\mathbf{u}})\) :
-
Strain tensor
- \(\sigma_{ij}\) :
-
Stress
- Γ :
-
Crack set
- \(\bar{\gamma }\) :
-
Body force
- \({\bar{\mathbf{t}}}\) :
-
Surface traction
- \(\varPi ({\mathbf{u}},\varGamma )\) :
-
Energy functional
- \(\psi ({\varvec{\upvarepsilon}}({\mathbf{u}}))\) :
-
Strain energy density
- G c :
-
Critical energy release rate
- S :
-
Phase field
- \(\epsilon\) :
-
The width of the transition zone of s
- \(\dot{E}\) :
-
The evolution of the degrading strain energy
- D :
-
Dissipation of the fracture
- P :
-
External power
- \(\psi_{0}^{ + } ({\varvec{\upvarepsilon}}({\mathbf{u}}))\) :
-
Strain energy density function for extension state
- \(\psi_{0}^{ - } ({\varvec{\upvarepsilon}}({\mathbf{u}}))\) :
-
Strain energy density function for compression state
- λ :
-
First lame constant
- μ :
-
Shear modulus
- \(\phi\) :
-
Crack dissipation per unit volume
- \(\beta\) :
-
Driving force field
- \(\eta\) :
-
Viscosity parameter
- \(\gamma\) :
-
Crack surface density function
- L :
-
Regularization parameter
- Ρ :
-
The bulk density of brittle rock
- η d :
-
Damping viscosity
- p :
-
Fluid pressure
- α :
-
Biot coefficient
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Acknowledgements
This work was supported by the National Natural Science Foundation of China (Grant No. 41602296) and the National Science and Technology Major Project (2016ZX05014-005-003). Special thanks are due to Lei Chen of Mississippi State University for his source codes and Dr. Xiaoguang Wang for his valuable suggestions.
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Liu, Z., Lu, Q., Sun, Y. et al. Investigation of the Influence of Natural Cavities on Hydraulic Fracturing Using Phase Field Method. Arab J Sci Eng 44, 10481–10501 (2019). https://doi.org/10.1007/s13369-019-04122-z
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DOI: https://doi.org/10.1007/s13369-019-04122-z