Criticality Conditions and Minimum Miscibility Pressure for Four-Component Gas Drives
Abstract/Contents
- Abstract
- The Heidemann and Khalil criticality criteria are reformulated in order to determine critical compositions at fixed temperature and pressure. The critical locus for an N-component system is parameterized by N - 3 mole fractions. The Peng-Robinson equation of state was used in this work but the same approach remains applicable to any two-constant cubic equation.The method proves to be fast and accurate. For four-component mixtures, the critical curve can be readily visualized in a phase diagram and the development of miscibility of a four-component gas drive thus better understood. The same procedure can be applied to systems with more components, even though the description of the critical locus becomes harder.An attempt is then made to determine the minimum miscibility pressure (MMP) in a four-component condensing/vaporizing gas drive, as the pressure that shortens the length of the crossover tie-line to zero. A reasonable estimate is obtained. But flash calculations are used to determine the crossover tie-line and the method fails to converge entirely due to singularities encountered as the critical region is approached.A new method is finally proposed to determine critical tie-lines directly from the criticality conditions. This technique is then applied to the determination of the MMP, as the minimum pressure at which either of the key tie-lines to the displacement becomes critical. Convergence is fast and accurate values of the MMP for four-component condensing/vaporizing gas drives are calculated.
Description
| Type of resource | text |
|---|---|
| Date created | September 1994 |
Creators/Contributors
| Author | Aleonard, Bruno |
|---|---|
| Primary advisor | Orr, Jr., Franklin M. |
| Degree granting institution | Stanford University, Department of Petroleum Engineering |
Subjects
| Subject | School of Earth Energy & Environmental Sciences |
|---|---|
| Genre | Thesis |
Bibliographic information
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Preferred citation
- Preferred Citation
- Aleonard, Bruno. (1994). Criticality Conditions and Minimum Miscibility Pressure for Four-Component Gas Drives. Stanford Digital Repository. Available at: https://purl.stanford.edu/dm484wx3131
Collection
Master's Theses, Doerr School of Sustainability
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- brannerlibrary@stanford.edu
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