Speaker
Description
Tight oil reservoirs are typically developed using hydraulic fracturing technology, wherein the leak-off behavior of fracturing fluid into the formation significantly impacts subsequent production processes. However, most current numerical simulations of fracturing and production are conducted independently, failing to accurately characterize the dynamic distribution of reservoir fluids throughout the entire fracturing-to-production lifecycle. To address the unclear bidirectional coupling mechanism between fracture propagation and fluid flow in porous media during the integrated fracturing and production process in tight oil reservoirs, this paper establishes an integrated numerical model that couples wellbore flow, fracture propagation, dynamic fracturing fluid loss, and matrix fluid flow. The model employs wellbore pressure drop equations and flux distribution equations to describe the flow within the wellbore, two-phase oil-water flow equations and proppant transport equations to characterize the flow behavior in the matrix and fractures, and an elastic mechanical model to capture the mechanical deformation of fractures. Changes in the temperature field are represented by an energy conservation equation that accounts for heat conduction and convection. Fracture propagation is simulated based on the Mode-I stress intensity factor criterion, and the embedded discrete fracture model (EDFM) is used to characterize the fracture system while explicitly calculating cross-flow between fractures and the matrix. The flow equations and energy conservation equation are discretized using the finite volume method, while the elastic mechanical model is discretized using the displacement discontinuity method. A sequential iterative coupling approach is applied to solve the thermo-hydro-mechanical mathematical model for the wellbore, fractures, and matrix in steps, resulting in the development of an integrated numerical simulation method for the fracturing and production process in tight oil reservoirs applicable to corner-point grids. The accuracy of the proposed numerical simulation method is validated through comparisons with analytical solutions. A series of case studies demonstrate that this numerical simulation method can accurately assess fracturing fluid loss, dynamically describe the coupling process between fracture propagation and reservoir fluid flow, fully simulate the entire process of fracturing, shut-in, and production in tight oil reservoirs, and exhibit its applicability on corner-point grids.
| Country | China |
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