Tie-Line Based Parameterization for Thermal Compositional Reservoir Simulation
Abstract/Contents
- Abstract
- Thermodynamic equilibrium computations are usually the most time consuming component in compositional reservoir flow simulation. A Compositional Space Adaptive Tabulation (CSAT) approach has been developed in order to speed up the Equation of State (EoS) computations. The methodology adaptively parameterizes the compositional space using a small number of tie-lines, which are assembled into a table. The phase equilibrium information for a composition is interpolated from the tie-line table. In this work, we extend the CSAT approach to thermal problems. Given an overall composition at a fixed temperature, the boundary between sub- and super-critical pressures is represented by the critical tie-line and the corresponding minimal critical pressure. A small set of sub-critical tie-lines is computed and stored for a given temperature. This process is repeated for the pressure and temperature ranges of interest, and a regular tie-line table is constructed. Close to the critical boundary, a refined tie-line table is used for phase identification. A combination of regular and refined interpolation improves the robustness of the tie-line search procedure and the overall efficiency of the computations. Several challenging tests are used to demonstrate the robustness and efficiency of this general thermal-compositional tie-line based parameterization method. Our results indicate that CSAT provides very accurate treatment of the near-critical region with a small number of preconditioned EoS flash iterations. Moreover, the computational efficiency of the method is at least an order of magnitude better than that of standard EoS-based approaches. We also show that the efficiency gains relative to standard techniques increase with the number of gridblocks in the simulation model.
Description
| Type of resource | text |
|---|---|
| Date created | June 2008 |
Creators/Contributors
| Author | Iranshahr, Alireza |
|---|---|
| Primary advisor | Tchelepi, Hamdi |
| Degree granting institution | Stanford University, Department of Energy Resources Engineering |
Subjects
| Subject | School of Earth Energy & Environmental Sciences |
|---|---|
| Genre | Thesis |
Bibliographic information
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Preferred citation
- Preferred Citation
- Iranshahr, Alireza. (2008). Tie-Line Based Parameterization for Thermal Compositional Reservoir Simulation. Stanford Digital Repository. Available at: https://purl.stanford.edu/vd835mg5288
Collection
Master's Theses, Doerr School of Sustainability
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