Spontaneous Imbibition and Wettability Characteristics of Powder River Basin Coal
Abstract/Contents
- Abstract
- We study the wettability of coal at scales that range from the microscopic to core to reservoir. While contact angle measurements define wettability at microscopic (pore) and core scales, relative permeability curves are used to define wettability and multiphase flow properties at core and reservoir scales. The microscopic wettability is evaluated based on the DLVO (Derjaguin, Landau, Verwey, Overbeek) theory. Estimates for contact angles have been made with variation in pH. The calculations suggest a trend in contact angle values with pH. The values go through a maximum at a pH around 4. They become small at low and high pH suggesting an alteration of coal wettability with pH and therefore with CO2 dissolution in the systems. Water imbibition studies indicate that the core-scale wetness has similar trends as those obtained on the pore scale. Contact angle goes through a maximum at a pH of around 7 and is low in highly acidic and basic solutions. CT scanning based imbibition studies also provide a method of understanding multiphase flow in coal systems. Estimates for relative permeability of air-water flow in coal are obtained and reported. The results are encouraging as these are the first steps towards developing relative permeability curves for coal-methane and carbon-dioxide systems. These systems are important with regards to CO2 sequestration and as well as enhanced methane production.
Description
| Type of resource | text |
|---|---|
| Date created | June 2006 |
Creators/Contributors
| Author | Chaturvedi, Tanmay |
|---|---|
| Primary advisor | Kovscek, Anthony R. |
| Advisor | Castanier, Louis |
| Degree granting institution | Stanford University, Department of Petroleum Engineering |
Subjects
| Subject | School of Earth Energy & Environmental Sciences |
|---|---|
| Genre | Thesis |
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Preferred citation
- Preferred Citation
- Chaturvedi, Tanmay. (2006). Spontaneous Imbibition and Wettability Characteristics of Powder River Basin Coal. Stanford Digital Repository. Available at: https://purl.stanford.edu/dt107ry6700
Collection
Master's Theses, Doerr School of Sustainability
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