Implementation of a Two Pseudo-Component Approach for Variable Bubble Point Problems in GPRS
Abstract/Contents
- Abstract
- The black-oil model is widely used in reservoir simulation. In this model, two pseudo components are used to represent the hydrocarbon system; a third component is used to represent water. In the standard black-oil model, the gas component is allowed to dissolve in the liquid oil phase. The point at which the mixture goes from single-phase liquid to two phases (i.e., liquid and gas) is called the bubble-point. There are many reservoir displacement processes where the bubble-point pressure is not necessarily constant. For example, in water-flooding operations of a depleted oil reservoir, it may be possible for all the free gas to dissolve as the pressure increases close to the injection site. In order to model variable bubble point problems in a black-oil formulation, special treatment is necessary. The black-oil model in the General Purpose Research Simulator (GPRS) was based on the assumption of constant bubble-point pressure throughout the simulation. In this report, we describe the extension for proper treatment of variable bubble-point problems. A Two Pseudo- Component Approach (TPCA) is used, in which the black-oil model is treated as a special compositional model with two hydrocarbon components, namely, oil and gas. The TPCA module, which is expected to replace the black-oil branch in GPRS completely, takes standard black-oil input data and translates them into compositional fluid properties. Then the black-oil simulation is actually carried out using the compositional code branch in GPRS, except that the equation-of-state computations are replaced by explicit expressions of the phase compositions. With the TPCA module and the reliable compositional treatment in GPRS, variable bubble point problems are handled correctly and efficiently.
Description
| Type of resource | text |
|---|---|
| Date created | June 2007 |
Creators/Contributors
| Author | Wang, Yi |
|---|---|
| Primary advisor | Tchelepi, Hamdi |
| Degree granting institution | Stanford University, Department of Energy Resources Engineering |
Subjects
| Subject | School of Earth Energy & Environmental Sciences |
|---|---|
| Genre | Thesis |
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Preferred citation
- Preferred Citation
- Wang, Yi. (2007). Implementation of a Two Pseudo-Component Approach for Variable Bubble Point Problems in GPRS. Stanford Digital Repository. Available at: https://purl.stanford.edu/ck116xd5537
Collection
Master's Theses, Doerr School of Sustainability
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