Citation: | WANG Hui, LIU Quansheng. 2020. Investigation on fracture propagation in fractured-cavity reservoirs based on FEMM-fracflow modelling. Journal of Geomechanics, 26(1): 55-64. doi: 10.12090/j.issn.1006-6616.2020.26.01.006 |
The propagation path of hydraulic fractures is critical to oil recovery in fractured-cavity reservoirs. Based on Hybrid Finite-element and Mesh-free Method-Fracflow (FEMM-Fracflow) numerical simulation platform, this paper explores the influence of natural caves, in-situ stress and injection velocity on the propagation path of hydraulic fractures in reservoirs. The simulation results show that when there are caves, the fracture propagates toward the cave. When the horizontal confining pressure is changed, the fracture propagates toward the cave obviously without applying horizontal confining pressure, and eventually connects with the cave; when the horizontal confining pressure of 50 MPa is applied, the trend of hydraulic fracture propagating toward the cave is obviously weakened; when injection velocity is changed, the fracture propagates toward the cave with the injection velocity of 0.05 kg/s, while the tendency of fracture propagating toward the cave is weakened with the injection velocity of 0.2 kg/s.
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Tetrahedral element passed by a planar fracture
Schematic of the FE, bridge, fracture elements
Flow path associated with a fracture-element
The volume of node associated with a fracture-element
Scheme of coupling principle between FEMM and Fracflow
A cubic rock with a central fracture
Simulation results of facture aperture
Geometry of a thin plate with a hole and an edge fracture
Fracture propagation near a hole without fluid
Comparison of the calculated path along the y direction for the fracture propagation near a hole without fluid with that of the reference
A cubic domain with a cavity and a central fracture
Vertical displacement distribution of the reservoir for hydraulic fracture propagation
Comparison of vertical displacement of the reservoir and fracture propagation path along the y direction under different confining pressures
Vertical displacement distribution of the reservoir under different water injection velocities
Geometry of the 3D model of the fractured-cavity reserior
Fracture propagation for the 3D hydraulic fracture propagation near a spherical cavity