CO₂ storage in carboniferous formations and abandoned coal by Manchao He; et al

By Manchao He; et al

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Extra resources for CO₂ storage in carboniferous formations and abandoned coal mines : proceedings of the International Workshop on CO₂ Storage in Carboniferous Formations and Abandoned Coal Mines

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Distributions of CO2 point sources and coal resources in China (Li, 2009). Figure 4. Distribution of CO2 industrial point sources in China (Li, 2009). indb 27 8/26/2011 10:07:46 AM Of these, about 50 large power plants located near coal mines and some abandoned mine, which provide adequate underground space for storage of CO2 emitted from coal-fired power generation. China has a total of 15,000 coal mines and the number of abandoned mines continue to increase. Meanwhile, a large amount of underground space is being produced everyday due to coal mining.

Rock profile. (a) (b) (c) (d) Figure 11. Underground water pumping processes: a) After mining; b) Filling concrete; c) Pumping underground water; and d) Water pipeline sealing. indb 32 8/26/2011 10:07:51 AM Pipelines constructed in the mining process to ensure underground production were kept after abandonment of the mine. Therefore, these pipelines after treatment can be used to pump water and new pipelines should be designed for the injection of CO2. 1. Underground water extraction After coal mining activities, mined-out area is filled with water (Figure 11a), so underground water needs to be pumped in order to inject CO2.

The gas storage mechanism in coal seams is distinctively different from that in oil and gas reservoirs and aquifers, where injected CO2 occupies the pore space as a separate phase or is dissolved in water or oil. Over the last two decades coalbed methane (CBM) has become an important source of (unconventional) natural gas supply in the United States. Carbon dioxide enhanced coalbed methane recovery (CO2-ECBM) is an emerging technology, which has the potential to store large volumes of CO2 in deep unminable coal formations (coalbeds).

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