Abstract
The effects of fracture roughness and geometric morphology of void space between two fracture walls on nonlinear fluid flow through rock fractures were investigated by performing fluid dynamic computation on mated and non-mated rock fractures. The fractal dimension D was used to characterize to the morphology of fracture void space, and it shows a positive correlation with either the root mean square of the height of the fracture void space morphology or the standard deviation of roughness angle. Forchheimer equation describes the nonlinear flow behavior through rock fractures well. Compared to mated rock fractures, the unmatched morphology of fracture void space of non-mated rock fractures increased the flow heterogeneities, producing prominent preferential flow and obvious eddy flow in non-mated rock fractures. This renders the nonlinear coefficient in the Forchheimer equation of non-mated rock fractures is generally greater than that of mated rock fractures of identical fracture aperture and roughness. For mated rock fractures, a power-law relationship was proposed to quantify the nonlinear coefficient b in terms of fracture peak asperity Rz, the first derivative of the profile Z2 and fracture aperture eh, and then, the critical Reynolds number for the onset of nonlinear fluid flow was derived. To further describe the influence of fracture void space morphology on the nonlinear fluid flow through non-mated rock fractures, an extended power-law model was proposed by quantifying b in terms of fracture surface roughness parameters Rz, Z2, aperture eh and fractal dimension D, and the critical Reynolds number to demark the onset of nonlinear flow was subsequently derived. The predicted critical Reynolds number agrees well with that of fluid dynamic computation for both mated and non-mated rock fractures, validating the proposed power-law and extended power-law relationships. Our research also shows that the critical Reynolds number generally decreased with the increase in fractal dimension.
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Data Availability Statement
The data that support the findings of this study are available from the corresponding author upon reasonable request. This manuscript has associated data in a data repository. [Authors’ comment: All data included in this manuscript are available upon request by contacting with the correspondind author.]
Abbreviations
- ρ :
-
Fluid density
- U :
-
Flow velocity vector
- μ :
-
Fluid viscosity
- F :
-
Body force vector
- P :
-
Fluid pressure
- ∇P :
-
Pressure gradient
- a :
-
Linear term coefficient
- b :
-
Nonlinear term coefficient
- Q :
-
Volumetric flow rate
- w :
-
Fracture width normal to the flow direction
- e h :
-
Hydraulic aperture
- A :
-
Cross section area of fracture, A = ehw
- k 0 :
-
Intrinsic permeability
- β :
-
Non-Darcy coefficient
- Re:
-
Reynolds number
- v :
-
Flow velocity
- E :
-
Non-Darcy effect factor
- Rec :
-
Critical Reynolds number
- u x :
-
X-Direction flow velocity
- u y :
-
Y-Direction flow velocity
- u z :
-
Z-Direction flow velocity
- R q :
-
Root mean square of the height of the profile
- R z :
-
Peak asperity height
- Z 2 :
-
Root mean square of the first derivative of the profile
- σ i :
-
Standard deviation of the roughness angle
- θ :
-
Average roughness angle of the profile
- L :
-
Projected length of fracture profile
- z i :
-
Asperity height at point i
- N :
-
The number of sampling points
- z a :
-
Distance of profile from the mean elevation line
- z max :
-
Maximum asperity height
- z min :
-
Minimum asperity height
- dz :
-
Increment of z of the profile
- dx :
-
Increment of x of the profile
- JRC:
-
Joint roughness coefficient
- S(δ):
-
Total area of the fracture surface element
- S 1, S 2, S 3 and S 4 :
-
Areas of four triangles in the schematic diagram of the triangular prism surface area method
- δ :
-
Size of a square grid
- h 0 :
-
Elevation at the center of the grid cell
- a 1, b 1, c 1 :
-
Side length of the triangle
- l 1 :
-
Perimeter of the triangle
- N(δ):
-
Number of total grid cells with scale δ × δ
- D :
-
Fractal dimension
- χ :
-
Fitting coefficient in the relationship between S(δ) and δ2
- P inlet :
-
Inlet pressure
- c :
-
Coefficient dependent on the surface roughness index
- m, n, m 1, n 1, p :
-
Dimensionless regression coefficients in the relationship between b and roughness parameters Rz, Z2 and D
- k :
-
Uplift distance of fracture surface
- d :
-
Dislocation distance
- i, j :
-
Sequence number
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This study was financially supported by the National Natural Science Foundation of China (Nos. 51674047 and 51911530152).
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Luo, Y., Zhang, Z., Zhang, L. et al. Influence of fracture roughness and void space morphology on nonlinear fluid flow through rock fractures. Eur. Phys. J. Plus 137, 1288 (2022). https://doi.org/10.1140/epjp/s13360-022-03499-5
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DOI: https://doi.org/10.1140/epjp/s13360-022-03499-5