Carbon Management Technology Conference,
7-9 February 2012,
Orlando, Florida, USA
Combating climate change by mitigation of release of the anthropogenic
greenhouse gases has attracted worldwide attention towards research and policy
formulations. One such approach utilizes the geological sequestration of carbon
dioxide into coal beds which is a value addition process, capable of enhancing
the yield of coalbed methane (CBM) in producing reservoirs. CO2 is
preferentially adsorbed onto the microporous structure of coal seams and it
displaces the methane molecule from the adsorption sites, thereby enhancing the
production of the low carbon eco-friendly fuel. In this study, a finite
difference based reservoir simulator, COMET3, has been utilized for
construction of underground coal bed scenario for Indian seams.
Numerical modeling involves solving complex equations used to describe some
physical process by iterative approximate solutions. Such simulation is worked
out for underground coal of Lower Gondwana sequence in Jharkhand state in
India. Detailed field work was carried out to collect samples and field data.
Laboratory tested parameters and some from published data were utilized for
construction of the numerical model. The best fit model was developed for
estimation of the volumes of gases involved in CO2 enhanced coalbed methane
recovery. It also gives a detailed analysis of distribution of gases with time
The results obtained from the simulation are quite encouraging and ascertain
that the process of CO2 enhanced CBM recovery seems to be technically feasible
for Indian scenario also. The simulation was executed for a period of 20 years
to understand the space-time disposition of injected CO2 and recovery of
methane from the reservoirs.
It is quantified in this study that for the chosen dimensions of coal block, a
total of 15.1 bcf of CO2 can be injected into the reservoir and approximately
5.0 bcf of methane can be recovered.
Keywords: Carbon capture and storage, CO2, ECBM Recovery, Indian coal seams