Modeling the effects of variable coal properties on methane production during enhanced coalbed methane recovery

Download

index.pdf

Date

2008

Author

Balan, Hüseyin Onur

Metadata

Show full item record

Item Usage Stats

218
views

129
downloads

Most of the coal properties depend on carbon content and vitrinite reflectance, which are rank dependent parameters. In this study, a new approach was followed by constructing a simulation input database with rank-dependent coal properties published in the literature which are namely cleat spacing, coal porosity, density, and parameters related to strength of coal, shrinkage, swelling, and sorption. Simulations related to enhanced coalbed methane (ECBM) recovery, which is the displacement of adsorbed CH4 in coal matrix with CO2 or CO2/N2 gas injection, were run with respect to different coal properties, operational parameters, shrinkage and swelling effects by using a compositional reservoir simulator of CMG (Computer Modeling Group) /GEM module. Sorption-controlled behavior of coalbeds and interaction of coal media with injected gas mixture, which is called shrinkage and swelling, alter the coal properties controlling gas flow with respect to injection time. Multicomponent shrinkage and swelling effects were modeled with extended Palmer and Mansoori equation. In conclusion, medium-volatile bituminous coal rank, dry coal reservoir type, inverted 5-spot pattern, 100 acre drainage area, cleat permeability from 10 to 25 md, CO2/N2 molar composition between 50/50 % and 75/25 %, and drilling horizontal wells rather than vertical ones are better selections for ECBM recovery. In addition, low-rank coals and dry coal reservoirs are affected more negatively by shrinkage and swelling. Mixing CO2 with N2 prior to its injection leads to a reduction in swelling effect. It has been understood that elastic modulus is the most important parameter controlling shrinkage and swelling with a sensitivity analysis.

Subject Keywords

Mining Engineering., Metallurgy.

URI

http://etd.lib.metu.edu.tr/upload/12609622/index.pdf
https://hdl.handle.net/11511/17674

Collections

Graduate School of Natural and Applied Sciences, Thesis

Suggestions

OpenMETU
Core

Investigation of the rheological properties of çayirhan coal-water mixtures Öztoprak, Ayşe Feray; Hiçyılmaz, Cahit; Department of Mining Engineering (2006) In this thesis, coal-water mixtures (CWM) with Çayırhan lignite were prepared to optimize the parameters of CWM having an ideal behavior which means that at maximum coal loading, relatively stable at static and dynamic conditions and exhibit low viscosity. For this purpose, the effect of the parameters such as pulp density, amount of chemical agents, particle size distribution, addition of methanol and pulp pH were investigated. Results showed that increasing pulp density negatively affects viscosity and al...
Use of aluminium dross for slag treatment in secondary steelmaking to decrease amount of reducible oxides in ladle furnace Aydemir, Onur; Geveci, Ahmet; Department of Metallurgical and Materials Engineering (2007) In this study it was aimed to analyse refining processes such as decreasing reducible oxide content of ladle slag with affecting parameters in low carbon aluminum killed grades and for the research Erdemir low carbon steel grades 7112K and 7110K are selected. There was a negative correlation between reducible oxide amount in ladle slag and desulphurization capacity of ladle slag with metal-slag reaction and steel internal cleanliness. To refine these properties of slag, aluminium dross, which was aluminium ...
A parametric comparative study of electrocoagulation and coagulation of aqueous suspensions of kaolinite and quartz powders Gülsün Kılıç, Mehtap; Hoşten, Çetin; Department of Mining Engineering (2009) Mineral treatment processes generally produce wastewaters containing ultrafine and colloidal particles that cause pollution upon their discharge into environment. It is essential that they should be removed from the wastewater before discharge. This study was undertaken by using synthetic turbid systems containing kaolinite and quartz particles in water with the amount of 0.20 g/L and 0.32 g/L, respectively. Removal of the turbidity was tried in two ways; electrocoagulation with aluminum anode and conventio...
A methodology for detection and evaluation of lineaments from satellite imagery Koçal, Arman; Karpuz, Celal; Department of Mining Engineering (2004) The discontinuities play an important role both in design and development stages of many geotechnical engineering projects. Because of that considerable time and capital should be spent to determine discontinuity sets by conventional methods. This thesis present the results of the studies associated with the application of the Remote Sensing (RS) and the development of a methodology in accurately and automatically detecting the discontinuity sets. For detection of the discontinuities, automatic lineament an...
A new concept on sampling systems by air cannon application Yünel, Ufuk; Hiçyılmaz, Cahit; Department of Mining Engineering (2004) The most important criterion in industrial production processes is to control the required product quality and comply with the standards pre-described for the application during any stage of the process. This control begins from the entry of raw material to the plant and continues with pre-determined points. Mainly two different types of inspection and analyses are used to examine the material quality and content. These are physical and chemical analysis.In most of the production plants above mentioned anal...

Citation Formats

H. O. Balan, “Modeling the effects of variable coal properties on methane production during enhanced coalbed methane recovery,” M.S. - Master of Science, Middle East Technical University, 2008.