Abstract
Acid fracturing is a technique to enhance productivity in carbonate formations. In this work, a thermal–hydraulic–mechanical–chemical (THMC) coupling model for acid fracture propagation is proposed based on a phase-field approach. The phase-field variable is utilized as an indicator function to distinguish the fracture and the reservoir, and to track the propagation of the fracture. The resulting system is a nonstationary, nonlinear, variational inequality system in which five different physical modules for the displacement, the phase-field, the pressure, the temperature, and the acid concentration are coupled. This multi-physical system includes numerical challenges in terms of nonlinearities, solution coupling algorithms, and computational cost. To this end, high fidelity physics-based discretizations, parallel solvers, and mesh adaptivity techniques are required. The model solves the phase-field and the displacement variables by a quasi-monolithic scheme and the other variables by a partitioned schemes, where the resulting overall algorithm is of iterative coupling type. In order to maintain the computational cost low, the adaptive mesh refinement technique in terms of a predictor-corrector method is employed. The error indicators are obtained from both the phase-field and concentration approximations. The proposed model and the computational robustness were investigated by studying fourteen cases as well as some mesh refinement studies. It is observed that the acid and thermal effect increase the fracture volume and fracture width. Moreover, the natural fractures and holes affect the acid fracture propagation direction.
Highlights
-
thermal–hydraulic–mechanical–chemical coupling system was established for acid fracture propagation based on a phase-field method.
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The acid fluid equations including diffusion, transport and reaction were derived. The penalization method was introduced based on physical reality.
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Acid fracture problem is a kind of dynamic heterogeneous problem. The adaptive mesh refinement was extended to help researchers get smooth simulation results and save computation costs.
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Abbreviations
- \(\Lambda\) :
- \(\partial \Lambda\) :
-
Boundary of computational domain
- t :
-
Computational time interval
- T :
-
Final computational time
- f :
-
Lower dimensional fracture
- \(\Omega _F,\Omega _R\) :
-
Fracture and reservoir sub-domains in \(\Lambda\)
- \(\varepsilon\) :
-
Half thickness of the fracture edge area
- \(\partial F\) :
-
Fracture interface in \(\Lambda\)
- \(\phi\) :
-
Phase-field variable
- \(\textbf{u}\) :
-
Vector-valued displacement
- p :
-
Scalar-valued pressure
- \(\Theta\) :
-
Scalar-valued temperature
- c :
-
Scalar-valued acid concentration
- \(\rho _F,\rho _R\) :
-
Fracture and reservoir densities
- \(\rho _{Ff}\) :
-
Fluid densities in fracture
- \(\rho _{Rf},\rho _{Rr}\) :
-
The rock and fluid densities in reservoir
- \(\varphi _F^*, \varphi _R^*\) :
-
Porosity of fracture and reservoir
- \({\texttt {Cap}}_F, \texttt{Cap}_R\) :
-
Heat capacities of fracture and reservoir
- \(K_{Fd}, K_{Rd}\) :
-
Thermal diffusion coefficient of reservoir and fracture
- \(V_F,V_R\) :
-
Fluid velocities in the fracture and reservoir
- \(q_{F\Theta }\), \(q_{R\Theta }\) :
-
Source terms of temperature equation
- \(q_{L }\) :
-
Leak-off terms of pressure equation
- M :
-
Biot’s modulus
- \(\alpha\) :
-
Biot’s coefficient
- \(K_{tc}\) :
-
Thermal expansion coefficient of pores
- \({K_{etch}}\) :
-
Acid etching coefficient
- \(R_c\) :
-
Acid–rock reaction term
- \(t_{etch}\) :
-
Etching time at any fixed points
- \(\eta _F,\eta _R\) :
-
Fluid viscosities in fracture and reservoir
- \(K_F, K_R\) :
-
Permeabilities in fracture and reservoir
- \(K_{Ffc},K_{Rfc}\) :
-
Fluid compressibilities in fracture and reservoir
- \({q_{Ff}},{q_{Rf}}\) :
-
Fluid source terms
- \({K_{Fc}},{K_{Rc}}\) :
-
Acid diffusion coefficients
- \({q_{Fc}},{q_{Rc}}\) :
-
Acid source terms
- \({K_{ar}}\) :
-
Acid–rock reaction rate speed
- \({p_r}\) :
-
Reference pressure for acid reaction
- Ea :
-
Activation energy of reaction equation
- R :
-
Gas constant.
- \({\Theta _T}\) :
-
Absolute temperature (unit in Kelvin)
- \({G_F}\) :
-
Critical energy release rate
- \(\sigma (\mathbf{{u}})\) :
-
Linear elastic stress tensor
- \(\sigma _{eff}\) :
-
Poroelastic stress tensor
- \(e(\mathbf{{u}})\) :
-
Strain tensor
- \(\lambda , G\) :
-
Lame coefficients
- I :
-
Second-order identity tensor
- E :
-
Young’s modulus
- \(\nu\) :
-
Poisson’s ratio
- \(3{\alpha _\Theta }\) :
-
Thermal expansion coefficient.
- k :
-
Regularization parameter
- \({C_\Theta }\) :
-
Temperature relation constant near the fracture
- \(\sigma ^ +\) :
-
Tensile stress
- \(\sigma ^ -\) :
-
Compression stress
- n :
-
The outward normal vector of the domain \(\Lambda\)
- \({f_p}, f_\Theta , f_c\) :
-
Given boundary values
- \(M_h\) :
-
The mesh family, \({h > 0}\) is the mash size
- \(\chi _F, \chi _R\) :
-
The indicator functions for subdomain
- \(D_f, D_r\) :
-
The distinguishing indexes for fracture and reservoir
- \(c_s\) :
-
Saturation concentration of acid
- \(\gamma _0, \gamma _{s}\) :
-
Penalization terms
- \(T{H_\phi }, T{H_{c}}\) :
-
Thresholds for adaptive mesh refinement
- \(Res( \cdot )\) :
-
Residual of each PDE system
- \(\mathrm {TOL_{s}}, {TOL_{fs}}\) :
-
The solver tolerance
- THMC :
-
Thermal–hydraulic–mechanical–chemical
- QOI :
-
Quantities of interest
- FV :
-
Fracture volume
- COD :
-
Crack opening displacements
- AC :
-
Acid consumption
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Acknowledgements
The authors are grateful to The National Key Research and Development Program of China under Grant (NO. 2022YFE0129800) and The National Natural Science Foundation of China (No. 52074311 and No.U19B6003-05). The first author is supported by a CSC scholarship. Moreover, the first author gratefully acknowledges the hospitality and computing resources at the Institute of Applied Mathematics during his CSC research stay.
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Dai, Y., Hou, B., Lee, S. et al. A Thermal–Hydraulic–Mechanical–Chemical Coupling Model for Acid Fracture Propagation Based on a Phase-Field Method. Rock Mech Rock Eng (2024). https://doi.org/10.1007/s00603-024-03769-x
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DOI: https://doi.org/10.1007/s00603-024-03769-x