Experimental Investigation of Enhanced Coal Bed Methane Recovery
Abstract/Contents
- Abstract
- Enhanced coal bed methane recovery involves simultaneous adsorption-desorption, diffusion and convection phenomena in the coal beds which can structurally be divided into matrix and cleats. This complex mechanism in a one-dimensional system is described by a non-linear, hyperbolic differential equation. Extensive work has been performed to solve the system analytically by method of characteristics. Solutions for binary, ternary and quaternary mixtures consisting of single and two-phase systems show the effects of component adsorption, volatility and injection gas composition on the solution profiles. This thesis presents a systematic approach of conducting experiments for performing onedimensional slim tube displacement for enhanced coal bed methane recovery. The purposes of the experimental studies are to understand the reservoir mechanisms of CO2 and N2 injection into coal beds, demonstrate the practical effectiveness of the ECBM and sequestration processes and the engineering capability to simulate them, and to validate the analytical results and conclusions. Single phase experiments are first conducted to investigate methane recovery by injection of pure and mixed gases. A tracer test is then conducted with non-adsorbing gases to find the dispersion coefficient of gases in coal tube. The result is useful to perform numerical simulations for the single phase systems. Two-phase investigations are further performed to validate the analytical results for different injection gas compositions. The experimental results are in good agreement with the analytical solutions. The calculation of dispersion coefficient is validated by both experimental and theoretical models and its application in the numerical simulation drives the spatially and temporally refined solutions to match with the dispersed experimental results. Two-phase experiments confirm the analytical theory for saturated and under-saturated systems and also show the presence of a degenerate shock in the solution profile for mixture injection.
Description
| Type of resource | text |
|---|---|
| Date created | July 2007 |
Creators/Contributors
| Author | Parakh, Sameer |
|---|---|
| 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
- Parakh, Sameer. (2007). Experimental Investigation of Enhanced Coal Bed Methane Recovery. Stanford Digital Repository. Available at: https://purl.stanford.edu/xk596tp3199
Collection
Master's Theses, Doerr School of Sustainability
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