Methane production from a CBM Reservoir:
In the absence of a conventional gas trap, what kind of hydrological conditions associated with a coal-bed may not allow an efficient de-watering process?
Since the production of coal bed methane gas significantly mitigates the emissions of green-house gases from mines; and with roughly 2000 TCF availability of methane gas all over the globe, shouldn’t the extraction of methane from a CBM Reservoir be encouraged - as the stored methane gas can also be released to the atmosphere resulting from the dropping of water table - resulting from climatic changes as well?
To what extent, the presence of ethane (Saprolelic source); and CO2 (Humic source) will hamper the generation; and in turn, the production of methane gas from a CBM Reservoir (particularly between 50 and 200 degrees Celcius during generation)?
Since the measurement of down-hole gas-phase flow velocity remains extremely difficult, to what extent, the real time detection of down-hole operating parameters (down-hole pressure, temperature and wellhead flow data) and its associated dynamic water level measurements will actually aid to estimate the total gas output from a single-well? Will it also help to precisely predict the specific gas output from a particular coal-bed (and in turn, to estimate the total gas output from all the related coal-beds) – over a particular period of time?
I have worked on this question and I suggest considering which source of methane is of interest. There will be some incorporated into the coal itself. Other methane will be biogenically produced in the water using the coal biomass. At that point it is operating more like a landfill than a natural gas extraction project. The same can be done with MEOR in spent or depleting reservoirs.
Dewatering is a custom solution based on the existing native conditions and the desired conditions to be achieved.
I look forward to having a conversation with you about this topic.
Best regards,
Ned
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