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By analyzing the flow character of a single drainage borehole in its effectingtime and the correlative theory introduced,the reason for “inflexion” appearance in theflow character curve of the single draining borehole in a multi-borehole was studied.Takingthe theory of permeation fluid mechanics and so on as basis,the coalbed gas flowmodel was set up,and the numerical simulation analyzer was built for undermine gasproducts.With the results from the analyzer,the gas capacity could be calculated underdifferent conditions and comparisons made with the site measurement data.
By analyzing the flow character of a single drainage borehole in its effectingtime and the correlative theory introduced, the reason for “inflexion” appearance in the flow character curve of the single draining borehole in a multi-borehole was studied .akingthe theory of permeation fluid mechanics and so on as basis, the coalbed gas flowmodel was set up, and the numerical simulation analyzer was built for undermine gasproducts.With the results from the analyzer, the gas capacity could be calculated under different conditions and comparisons made with the site measurement data.