Abstract
Hybrid solvent- and thermal-based methods offer an important potential for reducing the environmental impact and enhancing recoveries in heavy oil production processes. Time-consuming compositional simulations of fine-scale models challenge the optimization of operational conditions. This work developed a flow-based upscaling workflow for simulating the warm solvent injection process in heterogeneous reservoirs. This process takes into account the pattern of spatial heterogeneity at different scales. A set of coarse-scale models was considered to be constructed to capture the subscale variability due to coarsening. In this study, scale-up of several static (porosity, permeability) and dynamic or transport parameters (dispersivities) was considered. In order to depict the spatial heterogeneity below the modeling scale, several realizations of sub-scale models of the modeling-scale cell size were created. The difference in the flow simulation responses of a heterogeneous realization and an equivalent average model was minimized to estimate effective longitudinal and transverse dispersivities. Results from all realizations were aggregated to construct the probability distributions of effective dispersivities. Field data of typical Athabasca bitumen reservoirs were used to generate a set of synthetic fine-scale models to test the workflow. The method is flexible, as no explicit assumption regarding the multivariate distribution of the heterogeneity is required. This paper extends our previous work, which focuses on solute transport in single-phase flow, to adopting this statistical scale-up framework for a complex hybrid solvent-thermal process.
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Data Availability
The datasets generated and/or analyzed during the current study are available from the corresponding author on reasonable request.
Code Availability
The workflow is developed in a custom code in MATLAB®. Flow simulations are performed using a commercial software package (STARS by the Computer Modelling Group(CMG)). The sequential simulation code is part of an open-source algorithm provided in GitHub by Nussbaumer (2019).
Notes
1 mD = 0.001 darcy; 1 darcy = 0.9869233 µm2.
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Acknowledgments
The research is supported by the University of Alberta Future Energy Systems (FES), established by the Government of Canada's Canada First Research Excellence Fund (CFREF) with the project number T07-C02. We are thankful for providing the MATLAB® and STARS academic licenses to MathWorks™ and the Computer Modeling Group (CMG), respectively.
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Andriianova, E., Leung, J.Y. A Statistical Upscaling Workflow for Warm Solvent Injection Processes for Heterogeneous Heavy Oil Reservoirs. Nat Resour Res 30, 4417–4437 (2021). https://doi.org/10.1007/s11053-021-09921-6
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DOI: https://doi.org/10.1007/s11053-021-09921-6