Effects of Pressure Gradients on Displacement Performance for Miscible/New Miscible Gas Floods
Abstract/Contents
- Abstract
- For gas injection processes, MMP (Minimum Miscibility Pressure) is an important design parameter. However, pressure in a reservoir is not constant as it varies along the reservoir length from injector to producer (Pinj > MMP > Pprod). In this work, we investigate the effects of pressure gradients on local displacement efficiency and global sweep efficiency for both miscible and near miscible fluid displacements.Various gas/oil systems are investigated on a one-dimensional (1D) homogenous model.The impact of pressure gradients is analyzed by comparing available 1D analytical solutions with Eclipse-300 finite difference simulation results, in terms of variation in local displacement efficiency. The analysis shows that the effects of pressure gradients on displacement efficiency are small. This behavior results from the low viscosity of gas, which transfers high pressure from injector to producer, thereby maintaining high pressure at the displacement front. This means that the use of an analytical solution into compositional streamline simulation could be quite reasonable where the pressure is assumed to be constant for the calculation of phase behavior.Subsequently, pressure gradient effects are investigated on 2D heterogeneous models in terms of both local displacement efficiency and global sweep efficiency. Eclipse-300 and a compositional streamline simulator are used for the purpose of comparative analysis.The presented results demonstrate that the assumption of constant pressure along the displacement direction for the purpose of evaluation of phase behavior is not as significant as expected. However, some deviation is observed with increasing pressure gradient, primarily due to increases in front advancement and crossflow.
Description
| Type of resource | text |
|---|---|
| Date created | June 2004 |
Creators/Contributors
| Author | Srivastava, Nitin Kumar |
|---|---|
| Primary advisor | Gerritsen, Margot |
| 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
- Srivastava, Nitin Kumar. (2004). Effects of Pressure Gradients on Displacement Performance for Miscible/New Miscible Gas Floods. Stanford Digital Repository. Available at: https://purl.stanford.edu/jf303tn2013
Collection
Master's Theses, Doerr School of Sustainability
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